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... Why is adaptive optics needed? Turbulence in earth’s atmosphere makes stars twinkle More importantly, turbulence spreads out light; makes it a blob rather than a point ...
... Why is adaptive optics needed? Turbulence in earth’s atmosphere makes stars twinkle More importantly, turbulence spreads out light; makes it a blob rather than a point ...
New Worlds, New Horizons in Astronomy and
... Cover: Complexity abounds in the universe, especially during the birth phases of stars and planetary systems. The M17 region, also known as the Omega Nebula, in the constellation Sagittarius is rich in massive stars, including those recently formed and already impacting their environment (bright neb ...
... Cover: Complexity abounds in the universe, especially during the birth phases of stars and planetary systems. The M17 region, also known as the Omega Nebula, in the constellation Sagittarius is rich in massive stars, including those recently formed and already impacting their environment (bright neb ...
Venus Observing Information
... western sky where the effects of atmospheric differential refraction and prismatic dispersion destroy good image quality. Seeing conditions are so poor at such times that most observers have adopted a practice of viewing Venus only when has an altitude of ≥ 20° above the horizon. At times of western ...
... western sky where the effects of atmospheric differential refraction and prismatic dispersion destroy good image quality. Seeing conditions are so poor at such times that most observers have adopted a practice of viewing Venus only when has an altitude of ≥ 20° above the horizon. At times of western ...
RAL Space brochure - Science and Technology Facilities Council
... the interaction between electrically charged particles from the Sun and the Earth's magnetic field. The four Cluster spacecraft were launched in pairs on 16 July and 9 August 2000 and now orbit the Earth in formation. This unique set of multi-point measurements allows us to study, for the first time ...
... the interaction between electrically charged particles from the Sun and the Earth's magnetic field. The four Cluster spacecraft were launched in pairs on 16 July and 9 August 2000 and now orbit the Earth in formation. This unique set of multi-point measurements allows us to study, for the first time ...
The Reception of the Copernican Revolution
... Adopting the argument provided by Osiander, most scholars of the time considered the Copernican system to be an ingenious mathematical fiction that facilitated and improved the calculation of celestial ephemerides. This could be seen in the Prutenic Tables, calculated by Eramus Reinhold using the he ...
... Adopting the argument provided by Osiander, most scholars of the time considered the Copernican system to be an ingenious mathematical fiction that facilitated and improved the calculation of celestial ephemerides. This could be seen in the Prutenic Tables, calculated by Eramus Reinhold using the he ...
The Strikingly Uniform, Highly Turbulent Interstellar Medium of the
... of the presecence of an AGN (Dı́az-Santos et al. 2014). However, note that all galaxies harboring deeply obscured AGN, like W2246-0526, show [C ii]/FIR ratios less than ∼ 10−3 (Stacey et al. 2010; Wagg et al. 2010; Dı́az-Santos et al. 2013; Carilli & Walter 2013). The total [C ii] luminosity of W224 ...
... of the presecence of an AGN (Dı́az-Santos et al. 2014). However, note that all galaxies harboring deeply obscured AGN, like W2246-0526, show [C ii]/FIR ratios less than ∼ 10−3 (Stacey et al. 2010; Wagg et al. 2010; Dı́az-Santos et al. 2013; Carilli & Walter 2013). The total [C ii] luminosity of W224 ...
Galaxy Powerpoint Notes
... feature a shape that looks like a disk that usually has a bulge in the center and with arms that spiral outwards as the galaxy rotates. The most common spiral galaxies in our universe are the Milky Way Galaxy (the one we are in), and the Andromeda Galaxy (our nearest neighbor). Combined with Irregul ...
... feature a shape that looks like a disk that usually has a bulge in the center and with arms that spiral outwards as the galaxy rotates. The most common spiral galaxies in our universe are the Milky Way Galaxy (the one we are in), and the Andromeda Galaxy (our nearest neighbor). Combined with Irregul ...
Herschel Observers` Manual
... background of faint, unresolved sources. This makes Herschel a revolution for astronomy in a range of the far-IR that has hardly been exploited so far. Herschel observations will have a huge impact on astronomy and on our understanding of the universe. This manual describes the observatory aspects o ...
... background of faint, unresolved sources. This makes Herschel a revolution for astronomy in a range of the far-IR that has hardly been exploited so far. Herschel observations will have a huge impact on astronomy and on our understanding of the universe. This manual describes the observatory aspects o ...
Is Draco II one of the faintest dwarf galaxies? First study from Keck
... small telluric corrections (Martin et al. 2014). The signal to noise per pixel (S/N) of the reduced spectra in the Ca triplet region is typical 30/8 at iP1 = 18.0/20.0. For a cold stellar system like Dra II, it is particularly important to assess the level of systematics on the measured velocity unc ...
... small telluric corrections (Martin et al. 2014). The signal to noise per pixel (S/N) of the reduced spectra in the Ca triplet region is typical 30/8 at iP1 = 18.0/20.0. For a cold stellar system like Dra II, it is particularly important to assess the level of systematics on the measured velocity unc ...
Annual report 2004 - Département d`Astrophysique, Géophysique et
... with theoretical pulsation models. He and Si surface inhomogeneities of four Bp variable stars We present ground-based multi-colour Geneva photometry and high-resolution spectra of four variable B-type stars: HD 105382, HD 131120, HD 138769 and HD 55522. All sets of data reveal monoperiodic stars. A ...
... with theoretical pulsation models. He and Si surface inhomogeneities of four Bp variable stars We present ground-based multi-colour Geneva photometry and high-resolution spectra of four variable B-type stars: HD 105382, HD 131120, HD 138769 and HD 55522. All sets of data reveal monoperiodic stars. A ...
Lecture #1 Basic Concepts and Principles of Adaptive Optics
... telescope pupil; in other words it might be what would be observed on a flat screen placed just above the telescope, over a region which corresponds to the shape of the telescope aperture (usually an annular ring). Normally, one might expect the pattern to be uniform, but atmospheric turbulence diff ...
... telescope pupil; in other words it might be what would be observed on a flat screen placed just above the telescope, over a region which corresponds to the shape of the telescope aperture (usually an annular ring). Normally, one might expect the pattern to be uniform, but atmospheric turbulence diff ...
astro-ph/0303282 PDF
... space in the direction where the dust is denser, though of course a perturbing planet need not be located inside the dust itself. The observations were otherwise identical to those taken of Epsilon Eridani, with 15 x 6 x 15 seconds of total exposure per position. Sensitivity was similar in both the ...
... space in the direction where the dust is denser, though of course a perturbing planet need not be located inside the dust itself. The observations were otherwise identical to those taken of Epsilon Eridani, with 15 x 6 x 15 seconds of total exposure per position. Sensitivity was similar in both the ...
DUSTY CIRCUMSTELLAR DISKS B. Zuckerman
... for approximately 15 years, except for one star (β Pictoris), no one was able to image the distribution of dust particles around the Vega-like stars. Recently, there have been significant observational breakthroughs. From the ground, with sensitive detectors on large telescopes, images have been obt ...
... for approximately 15 years, except for one star (β Pictoris), no one was able to image the distribution of dust particles around the Vega-like stars. Recently, there have been significant observational breakthroughs. From the ground, with sensitive detectors on large telescopes, images have been obt ...
r202 the new astronomy
... Between January and November of 1983, the Dutch-American-British Infrared Astronomical Satellite (IRAS) conducted a sensitive and unbiased survey of the sky in four wavelength bands, centred at 12, 25, 60 and 100 microns. At the symposium, “Light on Dark Matter”, the scientific results of this missi ...
... Between January and November of 1983, the Dutch-American-British Infrared Astronomical Satellite (IRAS) conducted a sensitive and unbiased survey of the sky in four wavelength bands, centred at 12, 25, 60 and 100 microns. At the symposium, “Light on Dark Matter”, the scientific results of this missi ...
Projects
... NMG Gemini Near Infrared Spectrograph (GNIRS) DESCRIPTION: The Gemini Near Infrared Spectrograph is a $4.2 million long-slit spectrometer that has been mounted on the Gemini South 8-meter Telescope on Cerro Pachon, Chile. It will operate from 1 to 5 um and will offer two plate scales and a range of ...
... NMG Gemini Near Infrared Spectrograph (GNIRS) DESCRIPTION: The Gemini Near Infrared Spectrograph is a $4.2 million long-slit spectrometer that has been mounted on the Gemini South 8-meter Telescope on Cerro Pachon, Chile. It will operate from 1 to 5 um and will offer two plate scales and a range of ...
Developments in Space Policies, Programmes and Technologies
... regulations after October 2015, when the current regulatory grace period expires; in addition to changes to the formula FAA uses to determine how much insurance commercial launch providers must carry; and some changes to the National Oceanic and Atmospheric Administration’s (NOAA) licensing regime f ...
... regulations after October 2015, when the current regulatory grace period expires; in addition to changes to the formula FAA uses to determine how much insurance commercial launch providers must carry; and some changes to the National Oceanic and Atmospheric Administration’s (NOAA) licensing regime f ...
Orion® StarShoot™ AutoGuider inStructiOn MAnuAl
... We recommend using the SSAG for the first time during the day. This way, you can become familiar with the basic camera functions without having to stumble around in the dark. Setup your telescope and mount so the optical tube is pointing at an object that is at least a couple of hundred feet away. I ...
... We recommend using the SSAG for the first time during the day. This way, you can become familiar with the basic camera functions without having to stumble around in the dark. Setup your telescope and mount so the optical tube is pointing at an object that is at least a couple of hundred feet away. I ...
The HERMES GALAH survey: overview
... while most of the thick disk stars have [Fe/H] between about 1 and 0.3, with tails extending to 2 and 0.1. The similarity of the abundance spread of the thick disk stars near the sun to the globular clusters is remarkable. The stars of the thin and thick disks have di↵erent motions, di↵erent density ...
... while most of the thick disk stars have [Fe/H] between about 1 and 0.3, with tails extending to 2 and 0.1. The similarity of the abundance spread of the thick disk stars near the sun to the globular clusters is remarkable. The stars of the thin and thick disks have di↵erent motions, di↵erent density ...
Diapositive 1
... 4 Unit Telescopes (UTs) with main mirrors of 8.2m diameter (Six Baselines 47m-130m) 4 movable 1.8m diameter Auxiliary Telescopes (30 stations with Baselines 8m-202m) in the middle is the location of the recombine light coming from the pairs or triplet of telescopes. In this room are installed ...
... 4 Unit Telescopes (UTs) with main mirrors of 8.2m diameter (Six Baselines 47m-130m) 4 movable 1.8m diameter Auxiliary Telescopes (30 stations with Baselines 8m-202m) in the middle is the location of the recombine light coming from the pairs or triplet of telescopes. In this room are installed ...
black hole
... dwarfs. When you surveyed the stars, you learned that white dwarfs are the second most common kind of star. (Only red dwarfs are more abundant.) The billions of white dwarfs in our galaxy must be the remains of medium-mass stars. ...
... dwarfs. When you surveyed the stars, you learned that white dwarfs are the second most common kind of star. (Only red dwarfs are more abundant.) The billions of white dwarfs in our galaxy must be the remains of medium-mass stars. ...
Starburst Galaxies - Beck-Shop
... rest of the disk is that they contain numerous star-forming regions. In those regions the massive hot young stars are extremely bright and outshine the far more numerous less massive stars. Few starforming regions are to be found in the remainder of the disk and so, despite there still being many st ...
... rest of the disk is that they contain numerous star-forming regions. In those regions the massive hot young stars are extremely bright and outshine the far more numerous less massive stars. Few starforming regions are to be found in the remainder of the disk and so, despite there still being many st ...
siamois
... • Depth of convection and of second helium ionization zones • Mode excitation mechanisms (convection) • Rotation and internal structure Specification: ...
... • Depth of convection and of second helium ionization zones • Mode excitation mechanisms (convection) • Rotation and internal structure Specification: ...
Spitzer Space Telescope
![](https://commons.wikimedia.org/wiki/Special:FilePath/Spitzer_space_telescope.jpg?width=300)
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.