Big Bear Valley Astronomical Society
... connected to Sirius as the constellation itself did not take on its current form until Roman times. Sirius is a hot white star that will shine brightly for a long time to come. It is also a known binary system, with a tiny white dwarf star, coloquially known as 'the Pup', circling the brighter prima ...
... connected to Sirius as the constellation itself did not take on its current form until Roman times. Sirius is a hot white star that will shine brightly for a long time to come. It is also a known binary system, with a tiny white dwarf star, coloquially known as 'the Pup', circling the brighter prima ...
Planets Around M-dwarfs – Astrometric Detection and Orbit
... for planets around M-dwarfs as one of two priorities for the next 15 years of exoplanet science. The higher-mass M-dwarfs that have been probed up to now have a low Jupiter-mass planet ...
... for planets around M-dwarfs as one of two priorities for the next 15 years of exoplanet science. The higher-mass M-dwarfs that have been probed up to now have a low Jupiter-mass planet ...
Measuring the Gravity in Stars
... Line depth ratios can be used to measure accurately the temperature of a star. One choses two lines of different temperature sensitivities. These should be very close in wavelength so as to minimize errors due to continuum placement. ...
... Line depth ratios can be used to measure accurately the temperature of a star. One choses two lines of different temperature sensitivities. These should be very close in wavelength so as to minimize errors due to continuum placement. ...
Lecture Eleven (Powerpoint format)
... “The Shapley-Curtis debate makes interesting reading even today. It is important, not only as a historical document, but also as a glimpse into the reasoning processes of eminent scientists engaged in a great controversy for which the evidence on both sides is fragmentary and partly faulty. This d ...
... “The Shapley-Curtis debate makes interesting reading even today. It is important, not only as a historical document, but also as a glimpse into the reasoning processes of eminent scientists engaged in a great controversy for which the evidence on both sides is fragmentary and partly faulty. This d ...
Lecture7_2014_v2
... we have to develop theories that match “circumstantial evidence” - what the Solar System is like today • Observed data (today) are most consistent with theory that all the planets formed out of the same cloud of gas at the same time • Some of the wide variety seen within the existing planets may be ...
... we have to develop theories that match “circumstantial evidence” - what the Solar System is like today • Observed data (today) are most consistent with theory that all the planets formed out of the same cloud of gas at the same time • Some of the wide variety seen within the existing planets may be ...
Earth Jupiter Uranus Neptune Pluto orbit KUIPER BELT
... While still at a distance of more than 55 million miles from the Plutonian system, observations by long-range imager showed Pluto’s largest known moon, Charon, plus smaller moons Nix and Hydra. New Horizons also saw, for the first time, the tiny moons of Kerberos and Styx, originally discovered in 2 ...
... While still at a distance of more than 55 million miles from the Plutonian system, observations by long-range imager showed Pluto’s largest known moon, Charon, plus smaller moons Nix and Hydra. New Horizons also saw, for the first time, the tiny moons of Kerberos and Styx, originally discovered in 2 ...
Ground-Based Astrometry 2010-2020
... lengths have yielded reliable distances for many, giving empirical heft to estimates of luminosities, white dwarf masses, and (ultimately) space densities (Thorstensen et al. 2008). Because of ground-based parallax efforts on planetary nebulae central stars, we now know their luminosities and how t ...
... lengths have yielded reliable distances for many, giving empirical heft to estimates of luminosities, white dwarf masses, and (ultimately) space densities (Thorstensen et al. 2008). Because of ground-based parallax efforts on planetary nebulae central stars, we now know their luminosities and how t ...
6 The mysterious universe
... century allowed Earth-bound astronomers to see objects in the sky with much greater precision than ever before. Observations using telescopes showed that many different types of objects in the sky could be identified. These included single or double stars, groups of stars called galaxies, clusters o ...
... century allowed Earth-bound astronomers to see objects in the sky with much greater precision than ever before. Observations using telescopes showed that many different types of objects in the sky could be identified. These included single or double stars, groups of stars called galaxies, clusters o ...
Symposium on Telescope Science - Society for Astronomical Sciences
... Modern astronomy probably began in 1609 when Galileo Galilei pointed his spyglass at the cosmos. Since then, astronomers have been conducting science with telescopes. The simplest equipment set to conduct science with is as Galileo did with a telescope, time keeping device and a pencil. Events are n ...
... Modern astronomy probably began in 1609 when Galileo Galilei pointed his spyglass at the cosmos. Since then, astronomers have been conducting science with telescopes. The simplest equipment set to conduct science with is as Galileo did with a telescope, time keeping device and a pencil. Events are n ...
Finding Dark Matter
... Galactic Halo Dark Matter • Rotation velocities are too fast • Radial profile of rotation velocities suggests spherical distribution of dark matter – the Halo • One proposed candidate for the dark matter is in the form of “MAssive Compact Halo Objects” (MACHOs) – These can be detected through “grav ...
... Galactic Halo Dark Matter • Rotation velocities are too fast • Radial profile of rotation velocities suggests spherical distribution of dark matter – the Halo • One proposed candidate for the dark matter is in the form of “MAssive Compact Halo Objects” (MACHOs) – These can be detected through “grav ...
Chapter 19. Mapping the Universe from Herschel to Sloan
... he took into account that stars have different absolute magnitudes. He had to obtain the spectral type of each star mapped and use that to determine its absolute magnitude. Again, he neglected interstellar extinction – a fact which led to serious errors in his map. Both Herschel and Kapteyn got the ...
... he took into account that stars have different absolute magnitudes. He had to obtain the spectral type of each star mapped and use that to determine its absolute magnitude. Again, he neglected interstellar extinction – a fact which led to serious errors in his map. Both Herschel and Kapteyn got the ...
User Manual Explore Scientific Truss Tube Dobsonian Telescopes
... of the planets in astronomy circulars and soon on the information center of the Explore Scientific homepage. The following planets are especially suited for observations with your telescope: Venus: The diameter of Venus is about 9/10 the diameter of the earth. When Venus is orbiting the sun the astr ...
... of the planets in astronomy circulars and soon on the information center of the Explore Scientific homepage. The following planets are especially suited for observations with your telescope: Venus: The diameter of Venus is about 9/10 the diameter of the earth. When Venus is orbiting the sun the astr ...
Lect16-3-28-and-30-1..
... offset from the heart of the supernova ejecta. When Burrows did a detailed inspection of the HST image, he found a dim object which may be the source of the beam at the predicted location. The object is about 1/3 light-year from the center of the supernova explosion. ...
... offset from the heart of the supernova ejecta. When Burrows did a detailed inspection of the HST image, he found a dim object which may be the source of the beam at the predicted location. The object is about 1/3 light-year from the center of the supernova explosion. ...
Chapter 18 The Interstellar Medium - University of Texas Astronomy
... The interstellar medium consists of gas and dust. Gas is atoms and small molecules, mostly hydrogen and helium, with less than a percent other elements. (But most molecules contain these elements, because H and He do not form molecules easily.) Three ways to observe gas to be discussed (see notes th ...
... The interstellar medium consists of gas and dust. Gas is atoms and small molecules, mostly hydrogen and helium, with less than a percent other elements. (But most molecules contain these elements, because H and He do not form molecules easily.) Three ways to observe gas to be discussed (see notes th ...
Section 4
... discovered a planet revolving around another ordinary star. They used a method similar to the one used in studying binary stars. The astronomers observed that a star was moving slightly toward and away from us. They knew that the invisible object causing the movement didn’t have enough mass to be a ...
... discovered a planet revolving around another ordinary star. They used a method similar to the one used in studying binary stars. The astronomers observed that a star was moving slightly toward and away from us. They knew that the invisible object causing the movement didn’t have enough mass to be a ...
October, 2014 - Mahoning Valley Astronomical Society
... comet will complete more than 1/2 rotation during the descent; P67’s rotation rate is 12.4 hours. Philae has 12 different instruments on board. One is called CONSERT which will bounce low-frequency waves through its center, creating the first-ever image of a comet nucleus. Another instrument is APXS ...
... comet will complete more than 1/2 rotation during the descent; P67’s rotation rate is 12.4 hours. Philae has 12 different instruments on board. One is called CONSERT which will bounce low-frequency waves through its center, creating the first-ever image of a comet nucleus. Another instrument is APXS ...
Here
... Lrad is very nearly equal to Lacc throughout the main accretion phase, regardless of the detailed time dependence of Ṁ . Moreover, this equality holds even if the gas first strikes a circumstellar disk, then subsequently spirals onto the star (see § 11.3 below). The only stipulation is that each fl ...
... Lrad is very nearly equal to Lacc throughout the main accretion phase, regardless of the detailed time dependence of Ṁ . Moreover, this equality holds even if the gas first strikes a circumstellar disk, then subsequently spirals onto the star (see § 11.3 below). The only stipulation is that each fl ...
Hoffmann_Photon_Science_Novosibirsk_1__2015
... Expected Axion Signal •Most of the axions are emitted from the inner 20% of the Sun •Conversion probability is proportional to (BL)^2 •Therefore a strong magnet ic field needs to be pointed to the sun ...
... Expected Axion Signal •Most of the axions are emitted from the inner 20% of the Sun •Conversion probability is proportional to (BL)^2 •Therefore a strong magnet ic field needs to be pointed to the sun ...
PSC100 Summary Chapters 10 to Chapter 20
... stellar associations are made up primarily of Population I stars and are found in spiral discs and in irregular galaxies where large amounts of gas and dust are still available from which new stars can be formed. Our Sun is part of a stellar association. STELLAR ASSOCIATIONS are small groups of star ...
... stellar associations are made up primarily of Population I stars and are found in spiral discs and in irregular galaxies where large amounts of gas and dust are still available from which new stars can be formed. Our Sun is part of a stellar association. STELLAR ASSOCIATIONS are small groups of star ...
ph709-09
... 2008, OGLE-2006-BLG-109Lb and OGLE-2006-BLG-109Lc On February 14 the discovery of the, until now, most similar Jupiter-Saturn planetary system constellation was announced, with the ratios of mass, distance to their star and orbiting time similar to that of Jupiter-Saturn. This can be important for p ...
... 2008, OGLE-2006-BLG-109Lb and OGLE-2006-BLG-109Lc On February 14 the discovery of the, until now, most similar Jupiter-Saturn planetary system constellation was announced, with the ratios of mass, distance to their star and orbiting time similar to that of Jupiter-Saturn. This can be important for p ...
Globular Cluster M80
... apart. While globular clusters inhabit the galactic halo, open clusters are found in the galactic disks of spiral galaxies. Globular and open star clusters do share one important feature: Stars in each cluster type were born at the same time and formed out of the same cloud of interstellar gas. Both ...
... apart. While globular clusters inhabit the galactic halo, open clusters are found in the galactic disks of spiral galaxies. Globular and open star clusters do share one important feature: Stars in each cluster type were born at the same time and formed out of the same cloud of interstellar gas. Both ...
Spitzer Space Telescope
The Spitzer Space Telescope (SST), formerly the Space Infrared Telescope Facility (SIRTF), is an infrared space observatory launched in 2003. It is the fourth and final of the NASA Great Observatories program.The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments are no longer usable. However, the two shortest-wavelength modules of the IRAC camera are still operable with the same sensitivity as before the cryogen was exhausted, and will continue to be used in the Spitzer Warm Mission. All Spitzer data, from both the primary and warm phases, are archived at the Infrared Science Archive (IRSA).In keeping with NASA tradition, the telescope was renamed after its successful demonstration of operation, on 18 December 2003. Unlike most telescopes that are named after famous deceased astronomers by a board of scientists, the new name for SIRTF was obtained from a contest open to the general public.The contest led to the telescope being named in honor of astronomer Lyman Spitzer, who had promoted the concept of space telescopes in the 1940s. Spitzer wrote a 1946 report for RAND Corporation describing the advantages of an extraterrestrial observatory and how it could be realized with available or upcoming technology. He has been cited for his pioneering contributions to rocketry and astronomy, as well as ""his vision and leadership in articulating the advantages and benefits to be realized from the Space Telescope Program.""The US$800 million Spitzer was launched from Cape Canaveral Air Force Station, on a Delta II 7920H ELV rocket, Monday, 25 August 2003 at 13:35:39 UTC-5 (EDT).It follows a heliocentric instead of geocentric orbit, trailing and drifting away from Earth's orbit at approximately 0.1 astronomical unit per year (a so-called ""earth-trailing"" orbit). The primary mirror is 85 centimeters (33 in) in diameter, f/12, made of beryllium and is cooled to 5.5 K (−449.77 °F). The satellite contains three instruments that allow it to perform astronomical imaging and photometry from 3 to 180 micrometers, spectroscopy from 5 to 40 micrometers, and spectrophotometry from 5 to 100 micrometers.