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Bays Mountain Astronomy Club Edited by Adam Thanz January 2017 The Monthly Newsletter of the More on this image. See FN1 Chapter 1 Looking Up Brandon Stroupe - BMAC Chair More on this image. See FN2 Brandon Stroupe Looking Up Hello BMACers, January is the start of a new year. We welcome 2017 with open arms. 2016 was a pretty good year, but I’m hoping 2017 will be even better. We could sure use a year of good weather. It would be nice to have about 300 clear nights here. I know I am dreaming but hey, we can dream. I hope everyone had a great holiday season. I hope you all got what you wanted for Christmas and I hope everyone had a great New Year. Before we know it, it will be the holidays all over again. I plan on making 2017 an even better year for our club. I will do everything I can to bring great speakers to us and even get out under the stars at More on this image. See FN3 occultations result in a previously unknown double star’s discovery. Asteroid occultations, while somewhat rarer, can result in generating a silhouette of the asteroid--giving important size and shape information that is not otherwise easily obtained. These asteroid observations have also produced occasional discoveries of asteroid satellites and double stars. Steve is an optical systems engineer for the Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland. He has developed hardware for space missions for over 30 years. His enjoyment for telescope making as a teenager led him to a career in optics. some star parties as much as possible. If anyone has any Our meeting this month is also our annual dinner. It will be held suggestions on something they would like to try or a speaker on January 14th at 6:30 p.m. at Pratt’s BBQ in Kingsport. The they would like to hear, please let me know. snow date for our dinner will be on January 21st in case of very For our first meeting this year, I would like you to welcome back Steve Conard. Steve is a member of the International Occultation snowy weather. I hope everyone will make it a point to come out and enjoy some good food and a great speaker. Timing Association and his presentation will describe At our December meeting, we welcomed Dennis Hands. Dennis’s opportunities for amateur astronomers to contribute scientifically presentation was entitled, “How Far Away Are the Stars?” Since by timing occultations. Occultations of stars by the Moon are a antiquity, we’ve wondered about the stars. What are they made very regular occurrence, and about 1 in 100 video-timed of? How far away are they? When asked today about the Bays Mountain Astronomy Club Newsletter January 2017 3 Orion the Hunter Image from Stellarium 4 Bays Mountain Astronomy Club Newsletter January 2017 Orion’s Belt with the Horsehead Nebula by Alnitak. Image from Stellarium 5 Bays Mountain Astronomy Club Newsletter January 2017 Horsehead Nebula Image by Brandon Stroupe 6 Bays Mountain Astronomy Club Newsletter January 2017 distances, it’s easy to say that Proxima Centauri is almost 13 approximately 1,500 light years from Earth and it is one of the trillion miles away. We point our telescopes at M31 and tell our most identifiable nebulae because of its shape which bears some guests that the Andromeda Galaxy is almost 3 million light years resemblance to a horse’s head. This is one of my favorite objects away. But how do we know? Dennis took us on a journey through to image. Every year I try to image it again hoping to get better time to remember how we learned the distances to the stars. He results each time. If you haven’t already, make sure to check out started with how Aristotle and Hipparchus discovered methods the Horsehead Nebula in the constellation Orion when you are out used to determine one of the most basic features of the night sky: this month under the stars. How far away are the stars? Dennis gave us numerous examples and some very entertaining illustrations. His presentation was awesome. He was able to show us how to understand a very useful scientific formula on how to measure the distance of stars and we didn’t even have to take an advanced physics or astronomy class. He was a great speaker and I hope he will come back in the future. That will be it for this month. Just a reminder that the StarWatches will begin before we know it. They will begin again in March along with the SunWatches. We look forward to these public events so we can show everyone how awesome our night sky is. Also, before we know it, Astronomy Day will be upon us so please express your ideas on how to intrigue the public on our wonderful hobby. Until next month… Clear Skies. For our constellation this month, we will focus on a certain object in the Orion constellation. A couple of years ago, William Troxel spoke about the Orion Nebula and NGC 1981 in his January article. This time we will discuss one of my favorite objects, the Horsehead Nebula. The Horsehead Nebula is also known as Barnard 33. It is a dark nebula located just to the south of the star Alnitak, which is farthest east star in Orion’s Belt. It is also part of the much larger Orion Molecular Cloud Complex. This beautiful stellar nursery was first discovered by Williamina Fleming, a Scottish astronomer, in 1888. She took a photograph of it at the Harvard College Observatory on a photographic plate. That was pretty cool for that day and time. The Horsehead Nebula is 7 Bays Mountain Astronomy Club Newsletter January 2017 Chapter 2 BMAC Notes More on this image. See FN4 BMAC News Appalachian Eclipse 2017 More on this image. See FN3 becomes a false twilight. The lighting becomes quite eerie as the Witness one of nature’s most Sun’s light reaches us indirectly from all sides as we become exciting, and rarest, celestial events - bathed in the Moon’s shadow. The birds, and wind, quite down. a total solar eclipse! The next one to There is more to experience, and you should, on our excursion. occur will be on August 21, 2017. This trip includes: motor coach ride to the astronomical site and The goal is to travel to the narrow path of totality as it stretches back, private access to PARI (the Pisgah Astronomical Research across the continental United States. The Bays Mountain Park Institute), a special tour of PARI, snacks, lunch, and exceptional Association is proud to announce an exclusive excursion to dinner, unique t-shirt, solar glasses, access to telescopes with enjoy this experience. To do so, you need to be one of the 112 solar filters, hosted by degreed astronomers, and more! very lucky few who pre-register, with payment, to attend this special adventure. Not only are there only 112 seats available on our trip, but PARI is limiting access to their site so as to not overload their facility. A total solar eclipse is when the Moon travels between the Earth They will have guarded gates for safety. Our group will have a and Sun. The viewer, if on a narrow path, will see the Sun fully private corner of their campus including our own bathrooms, obscured to reveal the faint, tenuous Corona. Totality typically water access, and air conditioning. PARI is an astronomical only lasts a few minutes or so. A brief, fleeting of time. marvel with an amazing history in America’s space program. Our event boasts privacy, safety, and quietness. The reason is There are lots of details, so please visit the Park’s website here: important. There is much that occurs in the natural world during http://www.baysmountain.com/plan-your-visit/special-events-at- a total solar eclipse. The temperature drops, the wind picks up, bays-mountain-park-planetarium/appalachian-eclipse-2017/ and the birds start to chatter. When totality approaches, it Bays Mountain Astronomy Club Newsletter January 2017 ---------------------9 2017 Texas Star Party – Sign up now! The great tradition of dark sky observing continues with the 39th Annual TEXAS STAR PARTY near Ft Davis, Texas, May 21-28, 2017! Staying on the Ranch in housing, RV, or camping? Staying off-site in other accommodations? Everyone needs to enter the TSP drawing, held in late January. You should submit a Registration/Reservation Request Form to ENTER THE TSP DRAWING before January 20, 2017. This will provide you the highest possible chance of being selected as one of the 500 people who will be able to attend TSP this year. Follow this link to get started! http://texasstarparty.org/getstarted/ 10 Bays Mountain Astronomy Club Newsletter January 2017 Chapter 3 Celestial Happenings Jason Dorfman More on this image. See FN5 Jason Dorfman Celestial Happenings More on this image. See FN3 As the new year begins, we find Venus and Mars visible in the to shift the terminator back a bit at the poles thus giving it a southwest with Mars about 12 degrees above and to the left of slight concave appearance. Look in this month’s Sky & Venus. Venus is shining brightly at magnitude -4.4 and will Telescope for a short article on this effect and it’s namesake. continue to brighten through the month to mag. -4.7. Mars, on the other hand, continues to dim this month from mag. +0.9 to +1.1. Both lie in the constellation of Aquarius and will move into Pisces as the month progresses, Mars on the night of the 18th/ 19th and Venus on the 23rd. On the 1st, a thin crescent Moon will be just below and to the right of Venus and between Mars and Venus on the next night. The crescent Moon will again join this pair of planets at month’s end when together they will make a small triangle, an ideal photographic opportunity. If the weather cooperates, the Quadrantids have the potential for a strong showing this year. The peak night is on the 3rd/4th. The waxing crescent Moon sets before 10 p.m. providing clear, dark skies in the prime viewing predawn hours. The radiant for this shower is in the constellation of Boötes and rises before midnight climbing to 60 degrees as twilight approaches. The name of the shower comes from an old constellation called Quadrans Muralis, which is, of course, no longer used. The Quadrantids are known to produce some bright fireballs, so, if Venus reaches its greatest eastern elongation this month on the the skies are clear, it’s definitely worth a look. The predicted 12th. Technically, this is when the Sun-Venus-Earth angle is 90 Zenithal Hourly Rate (ZHR) is 120. degrees. We should see Venus in a perfect half phase showing 50% illumination. However, if you were to carefully observe the phase of Venus during the week around the 12th, you would actually note that it appeared to reach it’s half phase about 2 days prior. This is known as the Schröter Effect and is due to light scattering in the upper atmosphere of Venus which appears Bays Mountain Astronomy Club Newsletter January 2017 Jupiter will be transitioning from our morning skies to our late evening skies this month. It rises around 1 a.m. at the beginning of the month but will rise closer to 11 p.m. by month’s end. It remains in Virgo just a few degrees from 1st-magnitude Spica. On the 19th, a 3rd quarter Moon will pass just North of the “King of the Planets.” 12 Mercury makes a prominent appearance in the morning skies with its greatest western elongation occurring on the 19th. On that morning it will be 24 degrees west of the Sun and will be visible about 10 degrees above the horizon a half hour before sunrise. Wishing you all great views of the skies above for 2017! 13 Bays Mountain Astronomy Club Newsletter January 2017 Chapter 4 The Queen Speaks Robin Byrne Robin Byrne Happy Birthday Elisabeth Hevelius This month we celebrate the life of a woman considered by many he was 52, their marriage was a happy one. They had four to be the first female astronomer. Elisabeth Catherine Koopman children: a son, who died young, and three daughters. Hevelius was born January 17, 1647 in, what is now known as, Gdańsk, Poland (the city was called Danzig at the time). Her father, Nicholas Koopman, was part of the rich merchant class. He married Elisabeth’s mother, Joanna Mennings in 1633, living in Amsterdam and Hamburg before moving to Gdańsk. More on this image. See FN3 Elisabeth was known to be quite fluent in Latin. There is debate as to whether she learned it while growing up, or whether Johannes taught her. There is no doubt that he taught her the mathematics needed for his observations, so it would not seem unreasonable to conclude that he also taught her Latin. Elisabeth When Elisabeth was only a child, her fascination with astronomy corresponded with many well known scientists of the time, began. Lucky for her, living in the same town was a world- always writing in Latin. Many of her letters have been preserved renown astronomer, Johannes Hevelius. This young girl over the years, confirming her skill with Latin. approached Hevelius, asking to learn about astronomy. He told her to come back when she was older. In 1662, at the age of fifteen, Elisabeth returned to the home of the, now widowed, Hevelius, and reminded him of his promise. Seeing that her enthusiasm for astronomy was genuine, Hevelius began tutoring Elisabeth in astronomy and the instruments he used. The more time they spent together, the more they realized that they were Johannes Hevelius, among his many accomplishments, published maps of the Moon that were in much better detail than anything before seen. Using his telescopes, he drew maps of the Moon’s surface. It is not clear how much of this work was actually done by Elisabeth, but one can’t help but think quite a bit, since she is known as “the mother of Moon maps.” also falling in love. A year after they began working together, they Hevelius’s home was a complex of buildings, including his married in St. Catherine’s Church. Even though she was 16 and observatory. On September 26, 1679, it all burned to the ground. Ten days prior, he and Elisabeth had gone on a short trip out of Bays Mountain Astronomy Club Newsletter January 2017 15 Johanne & Elisabeth Hevelius 1673 16 Bays Mountain Astronomy Club Newsletter January 2017 town to rejuvenate. The horseman was sent back to the house. It Elisabeth Hevelius died on December 22, 1693 at the age of 46. is speculated that the horseman deliberately left a candle burning She was buried in the same tomb as Johannes. The in the stables, which started the fire. Almost everything was lost, mathematician Francois Arago wrote of Elisabeth, “A except for a few items neighbors and servants were able to save complimentary remark was always made about Madam Hevelius, (though some are suspected of stealing as much as they saved). who was the first woman, to my knowledge, who was not The house structures, observatory, and printing press were all frightened to face the fatigue of making astronomical lost. What was saved included most of his bound books, the observations and calculations.” In more recent times, Elisabeth manuscript for the book he was working on, much of their has been remembered by the naming of an asteroid, 12625 correspondence, and manuscripts from Johannes Kepler. Koopman, and a crater on Venus, Corpman. In 2006, the novel After Johannes Hevelius died in 1687, Elisabeth began compiling their mutual work into book form. The first book was published in 1687 and was titled “Stellarum Fixarum.” This book explained the “The Star Huntress” was published, based on her life. Whether gazing at the Moon or using a star chart, take a moment to reflect on the woman who helped create these tools we take for granted. techniques they used to compile their data. Three years later, two other books were completed: “Firmamentum Sobiescianum sive Uranographia,” which was comprised of 56 star charts that were created based on their observations, and “Prodromus References: Elisabeth Hevelius - Wikipedia Astronomiae,” which was a catalog of 1564 stars. The catalogue included star positions, which Johannes and Elisabeth determined using a sextant and quadrant combined with the known position of the Sun. Each star’s apparent magnitude was given twice (first as determined by Tycho Brahe, and second as https://en.m.wikipedia.org/wiki/Elisabeth_Hevelius Catherina Elisabeth Koopman Hevelius by J J O’Connor and E F Robertson determined by Hevelius). The positional data in this catalog was http://www-history.mcs.st-and.ac.uk/Biographies/ so precise, the coordinates were used for making celestial globes Hevelius_Koopman.html for another 50 years - long after the invention of the telescope. Hevelius’s Observatory Destroyed by Fire http://www-history.mcs.st-and.ac.uk/Extras/Hevelius_fire.html 17 Bays Mountain Astronomy Club Newsletter January 2017 Chapter 5 Space Place More on this image. See FN6 Marcus Woo Big Science in Small Packages About 250 miles overhead, a satellite the size of a loaf of bread flies in orbit. It’s one of hundreds of so-called CubeSats— spacecraft that come in relatively inexpensive and compact packages—that have launched over the years. So far, most CubeSats have been commercial satellites, student projects, or technology demonstrations. But this one, dubbed MinXSS (“minks”) is NASA’s first CubeSat with a bona fide science mission. Launched in December 2015, MinXSS has been observing the Sun in X-rays with unprecedented detail. Its goal is to better understand the physics behind phenomena like solar flares – eruptions on the Sun that produce dramatic bursts of energy and radiation. Much of the newly-released radiation from solar flares is concentrated in X-rays, and, in particular, the lower energy range called soft X-rays. But other spacecraft don’t have the capability to measure this part of the Sun’s spectrum at high resolution— which is where MinXSS, short for Miniature Solar X-ray Spectrometer, comes in. Using MinXSS to monitor how the soft X-ray spectrum changes over time, scientists can track changes in the composition in the Bays Mountain Astronomy Club Newsletter January 2017 More on this image. See FN3 Sun’s Corona, the hot outermost layer of the Sun. While the Sun’s visible surface, the Photosphere, is about 6,000 Kelvin (10,000 degrees Fahrenheit), areas of the Corona reach tens of millions of degrees during a solar flare. But even without a flare, the Corona smolders at a million degrees—and no one knows why. One possibility is that many small nanoflares constantly heat the Corona. Or, the heat may come from certain kinds of waves that propagate through the solar plasma. By looking at how the Corona’s composition changes, researchers can determine which mechanism is more important, says Tom Woods, a solar scientist at the University of Colorado at Boulder and principal investigator of MinXSS: “It’s helping address this very long-term problem that's been around for 50 years: how is the Corona heated to be so hot.” The $1 million original mission has been gathering observations since June. The satellite will likely burn up in Earth’s atmosphere in March. But the researchers have built a second one slated for launch in 2017. MinXSS-2 will watch long-term solar activity—related to the Sun’s 11-year sunspot cycle—and how variability in the soft 19 More on this image. See FN8 20 Bays Mountain Astronomy Club Newsletter January 2017 X-ray spectrum affects space weather, which can be a hazard for satellites. So the little-mission-that-could will continue—this time, flying at a higher, polar orbit for about five years. If you’d like to teach kids about where the Sun’s energy comes from, please visit the NASA Space Place: http:// spaceplace.nasa.gov/sun-heat/ This article is provided by NASA Space Place. With articles, activities, crafts, games, and lesson plans, NASA Space Place encourages everyone to get excited about science and technology. Visit spaceplace.nasa.gov to explore space and Earth science! 21 Bays Mountain Astronomy Club Newsletter January 2017 Chapter 6 BMAC Calendar and more More on this image. See FN7 BMAC Calendar and more Date More on this image. See FN3 Time Location Notes Friday, February 3, 2017 7 p.m. Nature Center Discovery Theater Program: Topic TBA; Free. Friday, March 3, 2017 7 p.m. Nature Center Discovery Theater Program: Topic TBA; Free. Friday, April 7, 2017 7 p.m. Nature Center Discovery Theater Program: Topic TBA; Free. 3-3:30 p.m. if clear At the dam View the Sun safely with a white-light view if clear.; Free. Observatory View the night sky with large telescopes. If poor weather, an alternate live tour of the night sky will be held in the planetarium theater.; Free. Pratt’s BBQ in Kingsport Annual BMAC Dinner. Steve Conard, a member of the International Occultation Timing Association, will describe opportunities for amateur astronomers to contribute scientifically by timing occultations. Occultations of stars by the Moon are a very regular occurrence, and about 1 in 100 video-timed occultations result in a previously unknown double star’s discovery. Asteroid occultations, while somewhat rarer, can result in generating a silhouette of the asteroid–giving important size and shape information that is not otherwise easily obtained. These asteroid observations have also produced occasional discoveries of asteroid satellites and double stars. Bio: Steve Conard is an optical systems engineer for the Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland. He has developed hardware for space missions for over 30 years. His enjoyment for telescope making as a teenager led him to a career in optics. Jan. 21 is the snow date. BMAC Meetings SunWatch Every Saturday & Sunday March - October StarWatch Mar. 4, 11, 2017 7:00 p.m. Mar. 18, 25, 2017 8:00 p.m. Apr. 1, 8, 15, 22, 29, 2017 8:30 p.m. Special Events Saturday, January 14, 2017 6:30 p.m. Bays Mountain Astronomy Club Newsletter January 2017 23 Bays Mountain Astronomy Club 853 Bays Mountain Park Road Kingsport, TN 37650 1 (423) 229-9447 www.baysmountain.com Regular Contributors: Brandon Stroupe Brandon is the current chair of the club. He is a photographer for his home business, Broader Horizons Photography and an avid astrophotographer. He has been a member since 2007. [email protected] Robin Byrne Annual Dues: Dues are supplemented by the Bays Mountain Park Association and volunteerism by the club. As such, our dues can be kept at a very low cost. $16 /person/year $6 /additional family member Note: if you are a Park Association member (which incurs an additional fee), then a 50% reduction in BMAC dues are applied. The club’s website can be found here: www.baysmountain.com/astronomy/astronomy-club/ Bays Mountain Astronomy Club Newsletter January 2017 Robin has been writing the science history column since 1992 and was chair in 1997. She is an Associate Professor of Astronomy & Physics at Northeast State Community College (NSCC). Jason Dorfman Jason works as a planetarium creative and technical genius at Bays Mountain Park. He has been a member since 2006. Adam Thanz Adam has been the Editor for all but a number of months since 1992. He is the Planetarium Director at Bays Mountain Park as well as an astronomy adjunct for NSCC. 24 Section 3 Footnotes Footnotes: 1. The Rite of Spring Of the countless equinoxes Saturn has seen since the birth of the solar system, this one, captured here in a mosaic of light and dark, is the first witnessed up close by an emissary from Earth … none other than our faithful robotic explorer, Cassini. Seen from our planet, the view of Saturn’s rings during equinox is extremely foreshortened and limited. But in orbit around Saturn, Cassini had no such problems. From 20 degrees above the ring plane, Cassini’s wide angle camera shot 75 exposures in succession for this mosaic showing Saturn, its rings, and a few of its moons a day and a half after exact Saturn equinox, when the sun’s disk was exactly overhead at the planet’s equator. The novel illumination geometry that accompanies equinox lowers the sun’s angle to the ring plane, significantly darkens the rings, and causes out-of-plane structures to look anomalously bright and to cast shadows across the rings. These scenes are possible only during the few months before and after Saturn’s equinox which occurs only once in about 15 Earth years. Before and after equinox, Cassini’s cameras have spotted not only the predictable shadows of some of Saturn’s moons (see PIA11657), but also the shadows of newly revealed vertical structures in the rings themselves (see PIA11665). Also at equinox, the shadows of the planet’s expansive rings are compressed into a single, narrow band cast onto the planet as seen in this mosaic. (For an earlier view of the rings’ wide shadows draped high on the northern hemisphere, see PIA09793.) The images comprising the mosaic, taken over about eight hours, were extensively processed before being joined together. First, each was re-projected into the same viewing geometry and then digitally processed to make the image “joints” seamless and to remove lens flares, radially extended bright artifacts resulting from light being scattered within the camera optics. At this time so close to equinox, illumination of the rings by sunlight reflected off the planet vastly dominates any meager sunlight falling on the rings. Hence, the half of the rings on the left illuminated by planetshine is, before processing, much brighter than the half of the rings on the right. On the right, it is only the vertically extended parts of the rings that catch any substantial sunlight. With no enhancement, the rings would be essentially invisible in this mosaic. To improve their visibility, the dark (right) half of the rings has been brightened relative to the brighter (left) half by a factor of three, and then the whole ring system has been brightened by a factor of 20 relative to the planet. So the dark half of the rings is 60 times brighter, and the bright half 20 times brighter, than they would have appeared if the entire system, planet included, could have been captured in a single image. The moon Janus (179 kilometers, 111 miles across) is on the lower left of this image. Epimetheus (113 kilometers, 70 miles across) appears near the middle bottom. Pandora (81 kilometers, 50 Bays Mountain Astronomy Club Newsletter January 2017 More on this image. See FN3 miles across) orbits outside the rings on the right of the image. The small moon Atlas (30 kilometers, 19 miles across) orbits inside the thin F ring on the right of the image. The brightnesses of all the moons, relative to the planet, have been enhanced between 30 and 60 times to make them more easily visible. Other bright specks are background stars. Spokes -ghostly radial markings on the B ring -- are visible on the right of the image. This view looks toward the northern side of the rings from about 20 degrees above the ring plane. The images were taken on Aug. 12, 2009, beginning about 1.25 days after exact equinox, using the red, green and blue spectral filters of the wide angle camera and were combined to create this natural color view. The images were obtained at a distance of approximately 847,000 kilometers (526,000 miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 74 degrees. Image scale is 50 kilometers (31 miles) per pixel. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo. For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov/. The Cassini imaging team homepage is at http://ciclops.org. Image Credit: NASA/JPL/Space Science Institute 2. Duke on the Craters Edge Astronaut Charles M. Duke Jr., Lunar Module pilot of the Apollo 16 mission, is photographed collecting lunar samples at Station no. 1 during the first Apollo 16 extravehicular activity at the Descartes landing site. This picture, looking eastward, was taken by Astronaut John W. Young, commander. Duke is standing at the rim of Plum crater, which is 40 meters in diameter and 10 meters deep. The parked Lunar Roving Vehicle can be seen in the left background. Image AS16-114-18423 Creator/Photographer: NASA John W. Young 3. The Cat's Eye Nebula, one of the first planetary nebulae discovered, also has one of the most complex forms known to this kind of nebula. Eleven rings, or shells, of gas make up the Cat's Eye. Credit: NASA, ESA, HEIC, and The Hubble Heritage Team (STScI/AURA) Acknowledgment: R. Corradi (Isaac Newton Group of Telescopes, Spain) and Z. Tsvetanov (NASA) 25 4. Jupiter & Ganymede NASA's Hubble Space Telescope has caught Jupiter's moon Ganymede playing a game of "peeka-boo." In this crisp Hubble image, Ganymede is shown just before it ducks behind the giant planet. Ganymede completes an orbit around Jupiter every seven days. Because Ganymede's orbit is tilted nearly edge-on to Earth, it routinely can be seen passing in front of and disappearing behind its giant host, only to reemerge later. Composed of rock and ice, Ganymede is the largest moon in our solar system. It is even larger than the planet Mercury. But Ganymede looks like a dirty snowball next to Jupiter, the largest planet in our solar system. Jupiter is so big that only part of its Southern Hemisphere can be seen in this image. Hubble's view is so sharp that astronomers can see features on Ganymede's surface, most notably the white impact crater, Tros, and its system of rays, bright streaks of material blasted from the crater. Tros and its ray system are roughly the width of Arizona. The image also shows Jupiter's Great Red Spot, the large eye-shaped feature at upper left. A storm the size of two Earths, the Great Red Spot has been raging for more than 300 years. Hubble's sharp view of the gas giant planet also reveals the texture of the clouds in the Jovian atmosphere as well as various other storms and vortices. Astronomers use these images to study Jupiter's upper atmosphere. As Ganymede passes behind the giant planet, it reflects sunlight, which then passes through Jupiter's atmosphere. Imprinted on that light is information about the gas giant's atmosphere, which yields clues about the properties of Jupiter's high-altitude haze above the cloud tops. This color image was made from three images taken on April 9, 2007, with the Wide Field Planetary Camera 2 in red, green, and blue filters. The image shows Jupiter and Ganymede in close to natural colors. Credit: NASA, ESA, and E. Karkoschka (University of Arizona) 5. 47 Tucanae In the first attempt to systematically search for "extrasolar" planets far beyond our local stellar neighborhood, astronomers probed the heart of a distant globular star cluster and were surprised to come up with a score of "zero". To the fascination and puzzlement of planet-searching astronomers, the results offer a sobering counterpoint to the flurry of planet discoveries announced over the previous months. "This could be the first tantalizing evidence that conditions for planet formation and evolution may be fundamentally different elsewhere in the galaxy," says Mario Livio of the Space Telescope Science Institute (STScI) in Baltimore, MD. The bold and innovative observation pushed NASA Hubble Space Telescope's capabilities to its limits, simultaneously scanning for small changes in the light from 35,000 stars in the globular star cluster 47 Tucanae, located 15,000 light-years (4 kiloparsecs) away in the southern constellation Tucana. Hubble researchers caution that the finding must be tempered by the fact that some astronomers always considered the ancient globular cluster an unlikely abode for planets for a variety of reasons. Specifically, the cluster has a deficiency of heavier elements that may be needed for building planets. If this is the case, then planets may have formed later in the universe's evolution, when stars were richer in heavier elements. Correspondingly, life as we know it may have appeared later rather than sooner in the universe. 26 Another caveat is that Hubble searched for a specific type of planet called a "hot Jupiter," which is considered an oddball among some planet experts. The results do not rule out the possibility that 47 Tucanae could contain normal solar systems like ours, which Hubble could not have detected. But even if that's the case, the "null" result implies there is still something fundamentally different between the way planets are made in our own neighborhood and how they are made in the cluster. Hubble couldn't directly view the planets, but instead employed a powerful search technique where the telescope measures the slight dimming of a star due to the passage of a planet in front of it, an event called a transit. The planet would have to be a bit larger than Jupiter to block enough light — about one percent — to be measurable by Hubble; Earth-like planets are too small. However, an outside observer would have to watch our Sun for as long as 12 years before ever having a chance of seeing Jupiter briefly transit the Sun's face. The Hubble observation was capable of only catching those planetary transits that happen every few days. This would happen if the planet were in an orbit less than 1/20 Earth's distance from the Sun, placing it even closer to the star than the scorched planet Mercury — hence the name "hot Jupiter." Why expect to find such a weird planet in the first place? Based on radial-velocity surveys from ground-based telescopes, which measure the slight wobble in a star due to the small tug of an unseen companion, astronomers have found nine hot Jupiters in our local stellar neighborhood. Statistically this means one percent of all stars should have such planets. It's estimated that the orbits of 10 percent of these planets are tilted edge-on to Earth and so transit the face of their star. In 1999, the first observation of a transiting planet was made by ground-based telescopes. The planet, with a 3.5-day period, had previously been detected by radial-velocity surveys, but this was a unique, independent confirmation. In a separate program to study a planet in these revealing circumstances, Ron Gilliland (STScI) and lead investigator Tim Brown (National Center for Atmospheric Research, Boulder, CO) demonstrated Hubble's exquisite ability to do precise photometry — the measurement of brightness and brightness changes in a star's light — by also looking at the planet. The Hubble data were so good they could look for evidence of rings or Earthsized moons, if they existed. But to discover new planets by transits, Gilliland had to crowd a lot of stars into Hubble's narrow field of view. The ideal target was the magnificent southern globular star cluster 47 Tucanae, one of the closest clusters to Earth. Within a single Hubble picture Gilliland could observe 35,000 stars at once. Like making a time-lapse movie, he had to take sequential snapshots of the cluster, looking for a telltale dimming of a star and recording any light curve that would be the true signature of a planet. Based on statistics from a sampling of planets in our local stellar neighborhood, Gilliland and his co-investigators reasoned that 1 out of 1,000 stars in the globular cluster should have planets that transit once every few days. They predicted that Hubble should discover 17 hot Jupiter-class planets. To catch a planet in a several-day orbit, Gilliland had Hubble's "eagle eye" trained on the cluster for eight consecutive days. The result was the most data-intensive observation ever done by Hubble. STScI archived over 1,300 exposures during the observation. Gilliland and Brown sifted through the results and came up with 100 variable stars, some of them eclipsing binaries where the companion is a star and not a planet. But none of them had the characteristic light curve that would be the signature of an extrasolar planet. There are a variety of reasons the globular cluster environment may inhibit planet formation. 47 Tucanae is old and so is deficient in the heavier elements, which were formed later in the universe through the nucleosynthesis of heavier elements in the cores of first-generation stars. Planet surveys show that within 100 light-years of the Sun, heavy-element-rich stars are far more likely to harbor a hot Jupiter than heavy-element-poor stars. However, this is a chicken and egg puzzle Bays Mountain Astronomy Club Newsletter January 2017 because some theoreticians say that the heavy-element composition of a star may be enhanced after if it makes Jupiter-like planets and then swallows them as the planet orbit spirals into the star. The stars are so tightly compacted in the core of the cluster – being separated by 1/100th the distance between our Sun and the next nearest star — that gravitational tidal effects may strip nascent planets from their parent stars. Also, the high stellar density could disturb the subsequent migration of the planet inward, which parks the hot Jupiters close to the star. Another possibility is that a torrent of ultraviolet light from the earliest and biggest stars, which formed in the cluster billions of years ago may have boiled away fragile embryonic dust disks out of which planets would have formed. These results will be published in The Astrophysical Journal Letters in December. Follow-up observations are needed to determine whether it is the initial conditions associated with planet birth or subsequent influences on evolution in this heavy-element-poor, crowded environment that led to an absence of planets. Credits for Hubble image: NASA and Ron Gilliland (Space Telescope Science Institute) 6. Space Place is a fantastic source of scientific educational materials for children of all ages. Visit them at: http://spaceplace.nasa.gov 7. NGC 3982 Though the universe is chock full of spiral-shaped galaxies, no two look exactly the same. This face-on spiral galaxy, called NGC 3982, is striking for its rich tapestry of star birth, along with its winding arms. The arms are lined with pink star-forming regions of glowing hydrogen, newborn blue star clusters, and obscuring dust lanes that provide the raw material for future generations of stars. The bright nucleus is home to an older population of stars, which grow ever more densely packed toward the center. NGC 3982 is located about 68 million light-years away in the constellation Ursa Major. The galaxy spans about 30,000 light-years, one-third of the size of our Milky Way galaxy. This color image is composed of exposures taken by the Hubble Space Telescope's Wide Field Planetary Camera 2 (WFPC2), the Advanced Camera for Surveys (ACS), and the Wide Field Camera 3 (WFC3). The observations were taken between March 2000 and August 2009. The rich color range comes from the fact that the galaxy was photographed invisible and near-infrared light. Also used was a filter that isolates hydrogen emission that emanates from bright star-forming regions dotting the spiral arms. Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA) Acknowledgment: A. Riess (STScI) 8. Astronaut Tim Peake on board the International Space Station captured this image of a CubeSat deployment on May 16, 2016. The bottom-most CubeSat is the NASA-funded MinXSS CubeSat, which observes soft X-rays from the Sun—such X-rays can disturb the ionosphere and thereby hamper radio and GPS signals. (The second CubeSat is CADRE — short for CubeSat investigating Atmospheric Density Response to Extreme driving - built by the University of Michigan and funded by the National Science Foundation.) Credit: ESA/NASA 27 Bays Mountain Astronomy Club Newsletter January 2017