Precision engineering for astronomy
... ratio of their focal lengths. The drawing identifies various parts of the telescope using the characters ‘a’ to ‘d’, but it is likely that the ‘o’ at the objective end is not an identification, but a representation of an aperture. Some of Galileo’s lenses were measured by Vasco Ronchi in 1923 using hi ...
... ratio of their focal lengths. The drawing identifies various parts of the telescope using the characters ‘a’ to ‘d’, but it is likely that the ‘o’ at the objective end is not an identification, but a representation of an aperture. Some of Galileo’s lenses were measured by Vasco Ronchi in 1923 using hi ...
"Earth" among 7 distant planets
... that there were small dips in the star's brightness at regular times. These dips were caused by planets crossing between the star and Earth. This was how they realized the planets were there. Last May, the scientists published that they had discovered three rocky bodies moving around the star. They ...
... that there were small dips in the star's brightness at regular times. These dips were caused by planets crossing between the star and Earth. This was how they realized the planets were there. Last May, the scientists published that they had discovered three rocky bodies moving around the star. They ...
PASSIVE INFRARED TELESCOPES - asas
... In the operating position shown below, with the upper edge of the vertical detection area horizontal (as is usual), the actual telescope SPI 104 is tilted downwards by 30°. This makes it difficult for intruders to estimate the real detection area . Passive IR detection is based on the recording of c ...
... In the operating position shown below, with the upper edge of the vertical detection area horizontal (as is usual), the actual telescope SPI 104 is tilted downwards by 30°. This makes it difficult for intruders to estimate the real detection area . Passive IR detection is based on the recording of c ...
doc
... 1 piece: Where do we put telescopes when we want to get rid of all atmospheric effects? 2 pieces: What is the difference between a reflecting telescope and a refracting telescope? 3 pieces: How much more light does a 12-m telescope collect than a 3-m telescope? 4 pieces: True or false (and why?): By ...
... 1 piece: Where do we put telescopes when we want to get rid of all atmospheric effects? 2 pieces: What is the difference between a reflecting telescope and a refracting telescope? 3 pieces: How much more light does a 12-m telescope collect than a 3-m telescope? 4 pieces: True or false (and why?): By ...
The Search for Worlds Like Our Own
... Austria, Belgium, Brazil, Germany, and Spain. CNES reported the first actual terrestrial planet in the beginning of 2009. While this object is larger than Earth—its radius is 1.68 times that of Earth—its discovery signaled the beginning of the search for planets like our own. It is very likely that ...
... Austria, Belgium, Brazil, Germany, and Spain. CNES reported the first actual terrestrial planet in the beginning of 2009. While this object is larger than Earth—its radius is 1.68 times that of Earth—its discovery signaled the beginning of the search for planets like our own. It is very likely that ...
The Classical Achromat
... the original Fraunhofer doublet was designed with a narrow air gap, like the one illustrated above, other designs use a wide gap, or indeed others have a narrow gap with the edges of the lenses touching (called a contact doublet) or a bonded (cemented) assembly. The benefits of a bonded assembly ar ...
... the original Fraunhofer doublet was designed with a narrow air gap, like the one illustrated above, other designs use a wide gap, or indeed others have a narrow gap with the edges of the lenses touching (called a contact doublet) or a bonded (cemented) assembly. The benefits of a bonded assembly ar ...
to view poster PDF - Max-Planck
... Gas-rich primordial disks and tenuous gas-poor debris disks are usually considered as two distinct evolutionary phases of the circumstellar matter. So far only a very few debris disks with measurable gas component have been known. We carried out a survey with the APEX radio telescope to detect molec ...
... Gas-rich primordial disks and tenuous gas-poor debris disks are usually considered as two distinct evolutionary phases of the circumstellar matter. So far only a very few debris disks with measurable gas component have been known. We carried out a survey with the APEX radio telescope to detect molec ...
question - UW Canvas
... ANSWER 21. When nuclear fusion of hydrogen to helium shuts down in the Sun’s core, there is no longer enough pressure to support the rest of the star. What happens in and around the core? a. The core expands, cools, and fusion of helium to carbon shell fusion begins. b. The core has a carbon flash, ...
... ANSWER 21. When nuclear fusion of hydrogen to helium shuts down in the Sun’s core, there is no longer enough pressure to support the rest of the star. What happens in and around the core? a. The core expands, cools, and fusion of helium to carbon shell fusion begins. b. The core has a carbon flash, ...
Measuring Radii and Temperatures of Stars
... (work in cgs or MKS units or work in AU and use the definition of a parsec) What would the angular diameter of the Sun be at 10 pc? ...
... (work in cgs or MKS units or work in AU and use the definition of a parsec) What would the angular diameter of the Sun be at 10 pc? ...
The wide field upgrade for the Hobby-Eberly Telescope
... 2. Current status of HET The HET is operating close to its original specifications, and in many areas, such as mirror alignment hold time, it significantly exceeds specifications. One important performance exception has been the delivered image quality. While much improved over recent years, over th ...
... 2. Current status of HET The HET is operating close to its original specifications, and in many areas, such as mirror alignment hold time, it significantly exceeds specifications. One important performance exception has been the delivered image quality. While much improved over recent years, over th ...
English Summary
... evolution is very short in comparison to the whole life of a star, it lasts only about 10 000 years. The nuclear reactions that have occurred in the interior of the star have resulted in a core of carbon and oxygen. The core of the star is not sufficiently hot to ignite nuclear reactions to transfor ...
... evolution is very short in comparison to the whole life of a star, it lasts only about 10 000 years. The nuclear reactions that have occurred in the interior of the star have resulted in a core of carbon and oxygen. The core of the star is not sufficiently hot to ignite nuclear reactions to transfor ...
Heat Through The Ages
... timeline. (Use a ruler, work in pencil for all illustrations, make light ruler liners to write neatly on in pen, You may word process the text at home, cut it out and paste it onto your timeline later.) 6. For each event, add the following information: the date must be highlighted, the event must be ...
... timeline. (Use a ruler, work in pencil for all illustrations, make light ruler liners to write neatly on in pen, You may word process the text at home, cut it out and paste it onto your timeline later.) 6. For each event, add the following information: the date must be highlighted, the event must be ...
Introduction to Occultations and How to Observe and Record Them
... public safety communications running a large radio system during which time I was very busy and did not get to spend much time building telescopes. At TSP 1995 I picked up a copy of the "CCD camera Cook Book" which turned out to be a "game changer" for me as I spent what little spare time I had buil ...
... public safety communications running a large radio system during which time I was very busy and did not get to spend much time building telescopes. At TSP 1995 I picked up a copy of the "CCD camera Cook Book" which turned out to be a "game changer" for me as I spent what little spare time I had buil ...
The Milky Way By
... exact figure depending on the number of very low-mass, or dwarf stars, which are hard to detect. Padurariu Cristian & Danciu Serban ...
... exact figure depending on the number of very low-mass, or dwarf stars, which are hard to detect. Padurariu Cristian & Danciu Serban ...
Connecting The World`s Tallest Mountain The Evolution Of
... High alpine desert life is sparse, but delicate Multiple endangered species, and introduced competitors present loss of habitat is a concern Eco-systems below 10,000' are much more apparent, and face many challenges from various land uses including astronomy ...
... High alpine desert life is sparse, but delicate Multiple endangered species, and introduced competitors present loss of habitat is a concern Eco-systems below 10,000' are much more apparent, and face many challenges from various land uses including astronomy ...
Low cost CCD cameras for amateur astronomy
... Webcams are the most widely used among those unconventional CCD devices because of advantages of using a computer to acquire the data. In the following section we describe techniques developed to overcome their major drawbacks: short exposition time, large noise and low stability. It turns out that ...
... Webcams are the most widely used among those unconventional CCD devices because of advantages of using a computer to acquire the data. In the following section we describe techniques developed to overcome their major drawbacks: short exposition time, large noise and low stability. It turns out that ...
The Origin of the Solar System
... Planets formed from the same protostellar material as the sun, still found in the sun’s atmosphere. Rocky planet material formed from clumping together of dust grains in the protostellar cloud. ...
... Planets formed from the same protostellar material as the sun, still found in the sun’s atmosphere. Rocky planet material formed from clumping together of dust grains in the protostellar cloud. ...
Christou_AO
... A “blob” rather than a point Seeing disk ~ 0.5 – 1.0 arcseconds With AO can approach the diffraction-limit ...
... A “blob” rather than a point Seeing disk ~ 0.5 – 1.0 arcseconds With AO can approach the diffraction-limit ...
Visible and NIR
... electron emission from a photosensitive intercepting surface The emitted electrons are accelerated and amplified These detectors are primarily used at shorter wavelengths, since the incoming photons must have sufficient energy to overcome the binding energy of the electrons Cesium has a cut-off wave ...
... electron emission from a photosensitive intercepting surface The emitted electrons are accelerated and amplified These detectors are primarily used at shorter wavelengths, since the incoming photons must have sufficient energy to overcome the binding energy of the electrons Cesium has a cut-off wave ...
An approach to ground based space surveillance
... Directed Vector Autocorrelation (DVA). It produces an approximate image of the binary pair with a suppressed ambiguity star and highlighted secondary. While DVA works well for binary star observation, it is not well suited for space surveillance if the size of the images to be processed is much larg ...
... Directed Vector Autocorrelation (DVA). It produces an approximate image of the binary pair with a suppressed ambiguity star and highlighted secondary. While DVA works well for binary star observation, it is not well suited for space surveillance if the size of the images to be processed is much larg ...
The Dimensions Program - Asnuntuck Community College
... A “light-year” is how far light can travel in one year. Since the speed of light in a vacuum is 3 X 108 meters per second, (300,000,000 meters per second) then it becomes possible to figure out how far light can travel in one year. One light-year is about 9.45 X 1015 meters ...
... A “light-year” is how far light can travel in one year. Since the speed of light in a vacuum is 3 X 108 meters per second, (300,000,000 meters per second) then it becomes possible to figure out how far light can travel in one year. One light-year is about 9.45 X 1015 meters ...
MIR_absorption
... species. Given the expected degree of line crowding, a resolution of R > 20,000 is needed to resolve blends and measure individual lines. Since infall velocities can be very small (< 5 km/s), higher spectral resolution (R~100,000) is needed to resolve the contribution from infalling gas. Class I sou ...
... species. Given the expected degree of line crowding, a resolution of R > 20,000 is needed to resolve blends and measure individual lines. Since infall velocities can be very small (< 5 km/s), higher spectral resolution (R~100,000) is needed to resolve the contribution from infalling gas. Class I sou ...
Philosophical Transactions of the Royal Society of London, 37 (1731
... Observer may not intercept the Rays in their Passage towards it, when the Angle to be observ’d is near 180º. The smaller Speculum is fix’d perpendicularly on a round brass Plate, tooth’d on the Edge; and may be adjusted by an endless Screw. In order to make an Observation, the Axis of the Telescope ...
... Observer may not intercept the Rays in their Passage towards it, when the Angle to be observ’d is near 180º. The smaller Speculum is fix’d perpendicularly on a round brass Plate, tooth’d on the Edge; and may be adjusted by an endless Screw. In order to make an Observation, the Axis of the Telescope ...
View PDF - Sara Seager
... has grown dramatically since the first planet orbiting a Sun-like star of almost all masses, sizes, and J orbits have been detected (Fig. 1), was discovered nearly 20 years ago S (1). Nearly 1000 exoplanets are illustrating not only the stochastic ...
... has grown dramatically since the first planet orbiting a Sun-like star of almost all masses, sizes, and J orbits have been detected (Fig. 1), was discovered nearly 20 years ago S (1). Nearly 1000 exoplanets are illustrating not only the stochastic ...
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.