Spectral Line VLBI
... Requires some “off” time, but can use scans on continuum calibrators RFI can be a big problem Alison Peck, Synthesis Imaging Summer School, 20 June 2002 ...
... Requires some “off” time, but can use scans on continuum calibrators RFI can be a big problem Alison Peck, Synthesis Imaging Summer School, 20 June 2002 ...
History And Progress Of Hunting Optics
... Innovation III: Riflescope with ballistic zoom Q: How do we compensate for bullet trajectory at longer range? ...
... Innovation III: Riflescope with ballistic zoom Q: How do we compensate for bullet trajectory at longer range? ...
Alignment Troubleshooting Alignment Procedure
... 1. Power on the NexStar by flipping the switch located at the base of the fork are to the on position. 2. Press ENTER to choose Sky Align. Pressing the ALIGN key will bypass the other alignment options and the scrolling text and automatically begins Sky Align. 3. The hand control display will then ...
... 1. Power on the NexStar by flipping the switch located at the base of the fork are to the on position. 2. Press ENTER to choose Sky Align. Pressing the ALIGN key will bypass the other alignment options and the scrolling text and automatically begins Sky Align. 3. The hand control display will then ...
Subject: Koblenz meeting From: Peter Abrahams
... now retired. Michael Simonsen gave a presentation on 'Military handheld binoculars in Danmark 1900 1945.' This will hopefully be posted on Mike's web site, and / or published in a book. Bernd Leisse described the optical collection of another German military museum, 'Das Museum für Historische Wehrt ...
... now retired. Michael Simonsen gave a presentation on 'Military handheld binoculars in Danmark 1900 1945.' This will hopefully be posted on Mike's web site, and / or published in a book. Bernd Leisse described the optical collection of another German military museum, 'Das Museum für Historische Wehrt ...
AG Optical Systems iDK Manual V10 2014
... against the adapter). If the laser spot traces an arc it means that the laser collimator is not properly aligned. In this case, the laser collimator should be replaced. Once you are sure your laser collimator is properly aligned observe where the laser spot falls on the secondary mirror. If it falls ...
... against the adapter). If the laser spot traces an arc it means that the laser collimator is not properly aligned. In this case, the laser collimator should be replaced. Once you are sure your laser collimator is properly aligned observe where the laser spot falls on the secondary mirror. If it falls ...
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... There is a significant Charge Transfer Efficiency (CTE) effect for all CCD detectors used in HST instruments; WFPC2: Dolphin (2000), STIS: Goudfrooij et al.(2006), ACS: Riess & Mack (2004), where the CTE effect was discussed in the terms of CTE-induced photometric losses in aperture photometry. Howe ...
... There is a significant Charge Transfer Efficiency (CTE) effect for all CCD detectors used in HST instruments; WFPC2: Dolphin (2000), STIS: Goudfrooij et al.(2006), ACS: Riess & Mack (2004), where the CTE effect was discussed in the terms of CTE-induced photometric losses in aperture photometry. Howe ...
Experience with the Hubble Space Telescope: Twenty Years
... imaging over a wavelength range that spans from the far UV to ~1 #m (and later out to 2.4 #m) was a challenge that required great attention to the mirrors’ micro-roughness, and to their emissivities and overall cleanliness (i.e. minimal areal dust coverage fraction). The latter was particularly diff ...
... imaging over a wavelength range that spans from the far UV to ~1 #m (and later out to 2.4 #m) was a challenge that required great attention to the mirrors’ micro-roughness, and to their emissivities and overall cleanliness (i.e. minimal areal dust coverage fraction). The latter was particularly diff ...
HUYGENS` DIOPTRICA
... points", although apparently he did not perceive that a solid object looks different to each eye; otherwise he might have anticipated Wheatstone and Brewster in the invention of the stereoscope. In the article on the eye and vision in the first part of the Dioptrica there is a description of a "simp ...
... points", although apparently he did not perceive that a solid object looks different to each eye; otherwise he might have anticipated Wheatstone and Brewster in the invention of the stereoscope. In the article on the eye and vision in the first part of the Dioptrica there is a description of a "simp ...
PDF
... The first announcement was of six new extrasolar planets, five of which were the first discovered via transit observations from the Kepler space telescope and then verified and studied in depth with precision radial velocities from the Keck I telescope and its High Resolution Echelle Spectrometer (H ...
... The first announcement was of six new extrasolar planets, five of which were the first discovered via transit observations from the Kepler space telescope and then verified and studied in depth with precision radial velocities from the Keck I telescope and its High Resolution Echelle Spectrometer (H ...
Woofer-Tweeter Adaptive Optics for Astronomy
... Adaptive optics has been used in telescopes to enable them achieve diffraction limited performance through atmospheric turbulence. As a technology, it is constantly improving to allow operation on larger telescopes with improved resolution and field of view. A dual mirror, single conjugate technique ...
... Adaptive optics has been used in telescopes to enable them achieve diffraction limited performance through atmospheric turbulence. As a technology, it is constantly improving to allow operation on larger telescopes with improved resolution and field of view. A dual mirror, single conjugate technique ...
Document
... Knots with “empty space” further out Only in the past 10 years that we have Realised that outflows can extend for many parsecs 1pc ~ 3 X 1013 km ~ 3.26 light years ~ 206265 AU Can outflows be larger than their parent cloud? ...
... Knots with “empty space” further out Only in the past 10 years that we have Realised that outflows can extend for many parsecs 1pc ~ 3 X 1013 km ~ 3.26 light years ~ 206265 AU Can outflows be larger than their parent cloud? ...
Swanson User Manual - Von Braun Astronomical Society
... sprays, and smoking. Both will damage optics. Do not attempt to clean the optics. The only person authorized to clean the optics is the observatory director. • Leave The Gorillas At Home. -- Although the telescope is large and massive, it does not require brute strength to operate. If the scope resi ...
... sprays, and smoking. Both will damage optics. Do not attempt to clean the optics. The only person authorized to clean the optics is the observatory director. • Leave The Gorillas At Home. -- Although the telescope is large and massive, it does not require brute strength to operate. If the scope resi ...
icso-2014-New desing-new challenge for space large
... ni divulgué à un tiers sans l'accord préalable et écrit de Thales Alenia Space - © 2012, Thales Alenia Space ...
... ni divulgué à un tiers sans l'accord préalable et écrit de Thales Alenia Space - © 2012, Thales Alenia Space ...
About the Hubble Space Telescope
... spatial distribution of galaxies and intergalactic gas. WFC3 is a new camera sensitive across a wide range of wavelengths (colors), including infrared, visible, and ultraviolet light. It will study planets in our Solar System, the formation histories of nearby galaxies, and early and distant galaxie ...
... spatial distribution of galaxies and intergalactic gas. WFC3 is a new camera sensitive across a wide range of wavelengths (colors), including infrared, visible, and ultraviolet light. It will study planets in our Solar System, the formation histories of nearby galaxies, and early and distant galaxie ...
120 Inch Telescope Aluminizing 2-7-06
... 25. Remove 2 aluminum clips from under 2 each ½ inch socket head spring-loaded guide pins. (45-a) If the heads do not bottom out, take hold of 2 or 3 rectangular shaped counterweights and push up on one while rattling the other back and forth until bolts drop in place. (46-e) 26. Install split PVC k ...
... 25. Remove 2 aluminum clips from under 2 each ½ inch socket head spring-loaded guide pins. (45-a) If the heads do not bottom out, take hold of 2 or 3 rectangular shaped counterweights and push up on one while rattling the other back and forth until bolts drop in place. (46-e) 26. Install split PVC k ...
Diapositiva 1
... or there is a subclass of blazar with peculiar characteristics? • SSC vs EC vs more complex models? How to distinguish? • AGILE observations has brought to light a more complex behaviour of blazars with respect to the standard models: - the presence of two emission components in any BL Lacs - the po ...
... or there is a subclass of blazar with peculiar characteristics? • SSC vs EC vs more complex models? How to distinguish? • AGILE observations has brought to light a more complex behaviour of blazars with respect to the standard models: - the presence of two emission components in any BL Lacs - the po ...
Seeing the infinitely small - Musées de la Ville de Genève
... has it that the telescope has its origins in Holland where children had apparently discovered that they could see into the distance while looking through two lenses placed one in front of the other. At the beginning of the 17th century Lippershey, a Dutch craftsman, sold an instrument “for seeing th ...
... has it that the telescope has its origins in Holland where children had apparently discovered that they could see into the distance while looking through two lenses placed one in front of the other. At the beginning of the 17th century Lippershey, a Dutch craftsman, sold an instrument “for seeing th ...
2013 - Society for Astronomical Sciences
... and obscurations. There are relatively rare instances of small groups of people at the same telescope or the same observing site documenting LTP, but no reports of two well-separated observers (by at least 50 km), to my knowledge, have been recorded—until 1999. ...
... and obscurations. There are relatively rare instances of small groups of people at the same telescope or the same observing site documenting LTP, but no reports of two well-separated observers (by at least 50 km), to my knowledge, have been recorded—until 1999. ...
The Hubble Space Telescope
... hy would a telescope in space allow the images to be ten times sharper than one on Earth? A. The telescope would be much closer to the object. B. Since there is zero gravity, the telescope can focus better. C. The telescope in space would be above Earth’s atmosphere. D. The telescope in space ...
... hy would a telescope in space allow the images to be ten times sharper than one on Earth? A. The telescope would be much closer to the object. B. Since there is zero gravity, the telescope can focus better. C. The telescope in space would be above Earth’s atmosphere. D. The telescope in space ...
... and high angular resolution (∼0.1◦ ). ACITs also have reasonably good energy resolution (∼ 20 − 40%), but small fields of view (FOV) (<5◦ ) and a background of diffuse cosmic electrons which produce electromagnetic cascades identical to those of γ-rays. ACITs also have low duty cycles (<10%) because ...
Very Large Telescope
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The Very Large Telescope (VLT) is a telescope operated by the European Southern Observatory on Cerro Paranal in the Atacama Desert of northern Chile. The VLT consists of four individual telescopes, each with a primary mirror 8.2 m across, which are generally used separately but can be used together to achieve very high angular resolution. The four separate optical telescopes are known as Antu, Kueyen, Melipal and Yepun, which are all words for astronomical objects in the Mapuche language. The telescopes form an array which is complemented by four movable Auxiliary Telescopes (ATs) of 1.8 m aperture.The VLT operates at visible and infrared wavelengths. Each individual telescope can detect objects roughly four billion times fainter than can be detected with the naked eye, and when all the telescopes are combined, the facility can achieve an angular resolution of about 0.001 arc-second (This is equivalent to roughly 2 meters resolution at the distance of the Moon).In single telescope mode of operation angular resolution is about 0.05 arc-second.The VLT is the most productive ground-based facility for astronomy, with only the Hubble Space Telescope generating more scientific papers among facilities operating at visible wavelengths. Among the pioneering observations carried out using the VLT are the first direct image of an exoplanet, the tracking of individual stars moving around the supermassive black hole at the centre of the Milky Way, and observations of the afterglow of the furthest known gamma-ray burst.