The Big Eye Now and Then
... To make this artificial star, a laser was broadcast into the sky. This was the first step in creating a laserguide star for use with a technique known as adaptive optics. Adaptive optics allows astronomers to correct for the fuzzy images produced by Earth’s moving atmosphere, giving them a view that ...
... To make this artificial star, a laser was broadcast into the sky. This was the first step in creating a laserguide star for use with a technique known as adaptive optics. Adaptive optics allows astronomers to correct for the fuzzy images produced by Earth’s moving atmosphere, giving them a view that ...
Astronomy on Antarctic Plateau - The National Academies of
... To some degree the Antarctica plateau is the closest match to space on the surface of the Earth. Site surveys at Dome C show atmospheric boundary layers of only 30 meters and the recent survey of Dome A confirmed the theoretical expectation that the boundary layer at Dome A is even thinner. Natural ...
... To some degree the Antarctica plateau is the closest match to space on the surface of the Earth. Site surveys at Dome C show atmospheric boundary layers of only 30 meters and the recent survey of Dome A confirmed the theoretical expectation that the boundary layer at Dome A is even thinner. Natural ...
Collimating Vixen VC200L / VMC200L Optical Tubes
... b. If you use a laser collimator, first be sure that the laser itself is collimated. Using an extension tube, insert the laser making sure it is flush up against the drawtube extension and tighten the focuser tension knob. Snug down the set screws gently and rotate the collimator. If the beam moves ...
... b. If you use a laser collimator, first be sure that the laser itself is collimated. Using an extension tube, insert the laser making sure it is flush up against the drawtube extension and tighten the focuser tension knob. Snug down the set screws gently and rotate the collimator. If the beam moves ...
an all-sky extrasolar planet survey with multiple object, dispersed
... the planet signal is 12.9 m s−1 , indicating that a systematic error is dominant for a longer term RV measurement. Further improvements in the instrument calibration and data analysis codes are being made to reduce the systematic error and hence to allow high-precision RV measurements for a future l ...
... the planet signal is 12.9 m s−1 , indicating that a systematic error is dominant for a longer term RV measurement. Further improvements in the instrument calibration and data analysis codes are being made to reduce the systematic error and hence to allow high-precision RV measurements for a future l ...
A magnetic diverter for charged particle background rejection
... Newton-XMM’s CCDs are coated with protective layers (aluminum, polypropylene and tin for the EPIC-MOS camera onboard XMM), soft protons can traverse them and, after some energy loss, deposit their energy in the detector charge transfer region. They are detected there as if they were X-ray photons an ...
... Newton-XMM’s CCDs are coated with protective layers (aluminum, polypropylene and tin for the EPIC-MOS camera onboard XMM), soft protons can traverse them and, after some energy loss, deposit their energy in the detector charge transfer region. They are detected there as if they were X-ray photons an ...
HRC Update Ralph Kraft and Junfeng Wang
... Mike Juda and the CXC Calibration team with the support of the HRC instrument team) to evaluate the effect of a progressive increase of the high voltage on both the top and bottom MCPs and determine how much of the lost QE in the wing plates could be recovered by a small increase to the HV. This pla ...
... Mike Juda and the CXC Calibration team with the support of the HRC instrument team) to evaluate the effect of a progressive increase of the high voltage on both the top and bottom MCPs and determine how much of the lost QE in the wing plates could be recovered by a small increase to the HV. This pla ...
Adaptive Optics Nicholas Devaney GTC project, Instituto de
... Membrane mirrors Liquid crystal mirrors ...
... Membrane mirrors Liquid crystal mirrors ...
Thompson
... the focal plane to a single detector type. Many components already have preliminary or in some cases a mature design. ...
... the focal plane to a single detector type. Many components already have preliminary or in some cases a mature design. ...
ISS RAM Direction
... (typ. 4, 12 or 24 sec) and max time to switch and settle of 0.5 sec. – Nominal nadir angle is 35 deg ...
... (typ. 4, 12 or 24 sec) and max time to switch and settle of 0.5 sec. – Nominal nadir angle is 35 deg ...
chd_ohp_a_ldr200906
... Counting gating is 0.5 microsecond, providing a 75 meters vertical resolution. Electronic gating is used on each channel, in order to reduce the effects of the large initial burst of light and the resulting induced noise. The choices for this instrumental configuration are detailed in Keckhut et al. ...
... Counting gating is 0.5 microsecond, providing a 75 meters vertical resolution. Electronic gating is used on each channel, in order to reduce the effects of the large initial burst of light and the resulting induced noise. The choices for this instrumental configuration are detailed in Keckhut et al. ...
The venerable craft of telescope mirror grinding takes on a
... until the mirror and telescope tube become adjusted to the new ambient temperatures. High resolution work is impossible during these transient periods because the carefully devised and meticulously achieved dimensions of the mirror surface change by several wavelengths of light. A second undesired c ...
... until the mirror and telescope tube become adjusted to the new ambient temperatures. High resolution work is impossible during these transient periods because the carefully devised and meticulously achieved dimensions of the mirror surface change by several wavelengths of light. A second undesired c ...
1876—1959 J o h n a u g u... A Biographical Memoir by
... California Institute of Technology for the construction of a 200inch telescope. As was necessary for any project of this size, a large organization was set up to handle the problems of the location, design, and construction of the new observatory. In general charge was the Observatory Council compos ...
... California Institute of Technology for the construction of a 200inch telescope. As was necessary for any project of this size, a large organization was set up to handle the problems of the location, design, and construction of the new observatory. In general charge was the Observatory Council compos ...
Philosophical Transactions of the Royal Society of London, 37 (1731
... Corol. 4. All the Parts of any Objects will appear to an Eye viewing them by the two successive Reflections, as before described, in the same Situation as if they had been turn’d together circularly round the Axis R, keeping their respective Distances from one another, and the Axis, with the Directi ...
... Corol. 4. All the Parts of any Objects will appear to an Eye viewing them by the two successive Reflections, as before described, in the same Situation as if they had been turn’d together circularly round the Axis R, keeping their respective Distances from one another, and the Axis, with the Directi ...
Instruction Manual Meade Instruments Corporation
... The 4 major moons of Jupiter, visible around the planet, changing position each night. ...
... The 4 major moons of Jupiter, visible around the planet, changing position each night. ...
ED80 Refractor - Camden Library Service
... The Earth is constantly rotating about its polar axis, completing one full rotation every 24 hours; this is what defines a “day”. We do not feel the Earth rotating, but we can tell that it is at night by seeing the apparent movement of stars from east to west. This movement translates into a rate of ...
... The Earth is constantly rotating about its polar axis, completing one full rotation every 24 hours; this is what defines a “day”. We do not feel the Earth rotating, but we can tell that it is at night by seeing the apparent movement of stars from east to west. This movement translates into a rate of ...
PDF
... leading hypothesis to explain AXP properties is that they are isolated neutron stars with ultra-high magnetic fields, so-called “magnetars” (Duncan & Thompson 1992). In this model, the X-ray emission is powered either by decay of the large magnetic field (Thompson & Duncan 1996) or neutron star coo ...
... leading hypothesis to explain AXP properties is that they are isolated neutron stars with ultra-high magnetic fields, so-called “magnetars” (Duncan & Thompson 1992). In this model, the X-ray emission is powered either by decay of the large magnetic field (Thompson & Duncan 1996) or neutron star coo ...
Fermi Fact Sheet - Fermi Gamma-ray Space Telescope
... Five notable sources within our galaxy: The Sun. Now near the minimum of its activity cycle, the Sun would not be a particularly notable source except for one thing: It’s the only one that moves across the sky. The Sun’s annual motion against the background sky is a reflection of Earth’s orbit aroun ...
... Five notable sources within our galaxy: The Sun. Now near the minimum of its activity cycle, the Sun would not be a particularly notable source except for one thing: It’s the only one that moves across the sky. The Sun’s annual motion against the background sky is a reflection of Earth’s orbit aroun ...
Problem Statement
... The error in the primary mirror went undiscovered. This is primarily due to the fact that both NASA and Perkin Elmer relied solely on the RNC for measurements. They had complete trust in the RNC to properly and accurately direct the grinding process. This was because they supposedly “certified” the ...
... The error in the primary mirror went undiscovered. This is primarily due to the fact that both NASA and Perkin Elmer relied solely on the RNC for measurements. They had complete trust in the RNC to properly and accurately direct the grinding process. This was because they supposedly “certified” the ...
XMM-Newton
The XMM-Newton, also known as the X-ray Multi-Mirror Mission and the High Throughput X-ray Spectroscopy Mission, is an orbiting X-ray observatory launched by ESA in December 1999 on an Ariane 5 rocket. It is named in honor of Sir Isaac Newton. The telescope was placed in a very eccentric 48 hour elliptical orbit at 40°; at its apogee it is nearly 114,000 kilometres (71,000 mi) from Earth, while the perigee is only 7,000 kilometres (4,300 mi).