Comets to Cosmology - Nrao - National Radio Astronomy Observatory
... illustrated with the titles of a few of the proposals that have been accepted for scheduling during 2012. Gravitational Wave Astronomy and Compact Objects One of the most significant discoveries in Astronomy and Astrophysics will be the direct detection of gravitational waves, first predicted by Ein ...
... illustrated with the titles of a few of the proposals that have been accepted for scheduling during 2012. Gravitational Wave Astronomy and Compact Objects One of the most significant discoveries in Astronomy and Astrophysics will be the direct detection of gravitational waves, first predicted by Ein ...
Reflecting `Popular Culture`: The Introduction, Diffusion, and
... years, only Robert Hooke succeeded in constructing a more or less working example of a reflecting telescope.11 A French design published in 1672 by Cassegrain also remained on the drawing table.12 Time would reveal that only a thorough and lengthy practice in shaping and polishing mirrors would lead ...
... years, only Robert Hooke succeeded in constructing a more or less working example of a reflecting telescope.11 A French design published in 1672 by Cassegrain also remained on the drawing table.12 Time would reveal that only a thorough and lengthy practice in shaping and polishing mirrors would lead ...
Ground-Conjugate Wide Field Adaptive Optics for the ELTs F. Rigaut
... Figure 2 displays the natural and compensated median FWHMs at Cerro Pachon and Cerro Paranal for the three bands V, J and K, versus the eld of view. This gure shows that this compensation scheme, like any other phase compensation method, is very wavelength dependant. Apparently, a threshold is pas ...
... Figure 2 displays the natural and compensated median FWHMs at Cerro Pachon and Cerro Paranal for the three bands V, J and K, versus the eld of view. This gure shows that this compensation scheme, like any other phase compensation method, is very wavelength dependant. Apparently, a threshold is pas ...
The achromatic design of an atmospheric dispersion corrector for
... For off-zenith astronomical observations with ground-based optical telescopes, the atmospheric dispersion elongates star images to spectra with the blue end pointed toward the Zenith. This effect of the atmospheric dispersion on image size relative to the diffraction limit (Airy disk) increases with ...
... For off-zenith astronomical observations with ground-based optical telescopes, the atmospheric dispersion elongates star images to spectra with the blue end pointed toward the Zenith. This effect of the atmospheric dispersion on image size relative to the diffraction limit (Airy disk) increases with ...
The Ages of Astrophotography - Powered by Catchers of the Light
... “The process of M. Daguerre is much more sensitive to the action of light than those which had been used so far. Never before has natural moonlight produced any perceptible physical effect, even when magnified with the largest lens, or focused by the biggest reflective mirror. The plates prepared by ...
... “The process of M. Daguerre is much more sensitive to the action of light than those which had been used so far. Never before has natural moonlight produced any perceptible physical effect, even when magnified with the largest lens, or focused by the biggest reflective mirror. The plates prepared by ...
Focus and pointing adjustments necessary for laser guide star
... commands are sent to the DM to correct sensed wavefront errors. However, several characteristics of the LGS differ from the NGS, and not all wavefront errors visible in an NGS are visible in an LGS. At Keck, the use of off-axis laser projection complicates the laser pointing model. Focus complicatio ...
... commands are sent to the DM to correct sensed wavefront errors. However, several characteristics of the LGS differ from the NGS, and not all wavefront errors visible in an NGS are visible in an LGS. At Keck, the use of off-axis laser projection complicates the laser pointing model. Focus complicatio ...
120 Inch Telescope Aluminizing 2-7-06
... 1. Carefully remove cellophane from mirror surface. 2. Insulate mirror blank: A. Install 1 inch black masking tape to ¼ inch inside mirror surface of radius edge. B. One wrap of single face 2 inch masking tape. C. One wrap of double face 2 inch masking tape. D. One wrap of 3 inch corrugated cardboar ...
... 1. Carefully remove cellophane from mirror surface. 2. Insulate mirror blank: A. Install 1 inch black masking tape to ¼ inch inside mirror surface of radius edge. B. One wrap of single face 2 inch masking tape. C. One wrap of double face 2 inch masking tape. D. One wrap of 3 inch corrugated cardboar ...
RPT-O-G0047 Gemini Telescopes f/16 Optical
... configuration. A great deal of work has been done to characterize the optical properties of the telescopes. Sources include work done by the Gemini staff, those in partner countries as well as subcontracted studies. This report attempts to summarize the conclusions of the work done to date and provi ...
... configuration. A great deal of work has been done to characterize the optical properties of the telescopes. Sources include work done by the Gemini staff, those in partner countries as well as subcontracted studies. This report attempts to summarize the conclusions of the work done to date and provi ...
Origami Sunshield Concepts for Space Telescopes Lee Wilson and Sergio Pellegrino Rolf Danner
... An important requirement is that the sunshield should be designed in such a way as to occupy the smallest possible volume when it is packaged, and this was achieved by selecting the design parameters of the prototype such that the packaged height would be minimized. There are three factors that dete ...
... An important requirement is that the sunshield should be designed in such a way as to occupy the smallest possible volume when it is packaged, and this was achieved by selecting the design parameters of the prototype such that the packaged height would be minimized. There are three factors that dete ...
Galileo
... On orders of the Pope Paul V, Cardinal Bellarmine delivered to Galileo an order not to "hold or defend" the idea that the Earth moves and the Sun stands still at the centre. The decree did not prevent Galileo from discussing heliocentrism hypothesis (thus maintaining a facade of separation between s ...
... On orders of the Pope Paul V, Cardinal Bellarmine delivered to Galileo an order not to "hold or defend" the idea that the Earth moves and the Sun stands still at the centre. The decree did not prevent Galileo from discussing heliocentrism hypothesis (thus maintaining a facade of separation between s ...
T1000700-v2 Transmon Telescope Mirror Test Procedure
... Turn on Autocollimator #2, and Tip and tilt the secondary mount until the reflected reticle pattern is centered in Autocollimator #2. Focus the projected autocollimator reticle pattern onto a target in front of and centered with the secondary mirror barrel. Adjust the height of the secondary mirror ...
... Turn on Autocollimator #2, and Tip and tilt the secondary mount until the reflected reticle pattern is centered in Autocollimator #2. Focus the projected autocollimator reticle pattern onto a target in front of and centered with the secondary mirror barrel. Adjust the height of the secondary mirror ...
Celestron Dacl"fl"c ...the world`s leading manufacturer the Celestron
... Celesrron 5 scales down to five inches of clear aperture all of the fine features of the Celestron 8. It causes failll celestial objects to appear 188 times brighter than to the unaided eye and its resolution is 0.8 arc seconds. If your interest in astronomy is something less than all-encompassing, ...
... Celesrron 5 scales down to five inches of clear aperture all of the fine features of the Celestron 8. It causes failll celestial objects to appear 188 times brighter than to the unaided eye and its resolution is 0.8 arc seconds. If your interest in astronomy is something less than all-encompassing, ...
Real-time earthquake warning for astronomical observatories
... velocity beneath them. Conventional seismometers are simple to convert from raw data to ground velocity, as their frequency response is flat between 0.008 Hz – 70 Hz and relative calibration errors of broadband seismometers lie well below 0.1 [25]. At the point in time when latitude, longitude, and ...
... velocity beneath them. Conventional seismometers are simple to convert from raw data to ground velocity, as their frequency response is flat between 0.008 Hz – 70 Hz and relative calibration errors of broadband seismometers lie well below 0.1 [25]. At the point in time when latitude, longitude, and ...
T1000311-v7 TMS Hazards Analysis - DCC
... Each team member should inspect to hid/her satisfaction the prospective part to be handled to determine if that part has a potentially hazardous sharp edge. Hands may also be pinched when assembling parts to one another, but this can be mitigated with proper attention to handling the parts. During t ...
... Each team member should inspect to hid/her satisfaction the prospective part to be handled to determine if that part has a potentially hazardous sharp edge. Hands may also be pinched when assembling parts to one another, but this can be mitigated with proper attention to handling the parts. During t ...
5. System Engineering
... Key element of a system approach are modelling and computer simulations. Models provide a means of understanding complex phenomena and of evaluating the overall response of the system to specified disturbances (e.g. a change of environmental condition or of a specific design characteristics). By usi ...
... Key element of a system approach are modelling and computer simulations. Models provide a means of understanding complex phenomena and of evaluating the overall response of the system to specified disturbances (e.g. a change of environmental condition or of a specific design characteristics). By usi ...
PARI Newsletter Spring
... of the eclipsing binary V523 Cassiopeia. This binary consists of two solar type stars orbiting each other in 5.5 hours! The light curves shown in Figure 10 are the result of 7 nights of observing, accumulating more than 1,200 images per filter. The light curves were used to compare the period of rev ...
... of the eclipsing binary V523 Cassiopeia. This binary consists of two solar type stars orbiting each other in 5.5 hours! The light curves shown in Figure 10 are the result of 7 nights of observing, accumulating more than 1,200 images per filter. The light curves were used to compare the period of rev ...
ULTRA Optics - Composite Mirror Applications Inc.
... optical quality of their mirrors. But professional optical shop practitioners also employ Ronchi as a tool to determine figure accuracy and surface roughness. Interferometric testing or wave front testing is usually employed if quantifiable data on the wave front or surface quality of a mirror is re ...
... optical quality of their mirrors. But professional optical shop practitioners also employ Ronchi as a tool to determine figure accuracy and surface roughness. Interferometric testing or wave front testing is usually employed if quantifiable data on the wave front or surface quality of a mirror is re ...
Experience with the Hubble Space Telescope: Twenty Years
... HST operates in low earth orbit, at altitudes that have varied from 615 km to the current 565 km [13]. During a typical ~96 minute orbit, it will spend most of its time in pointed astronomical observations. This efficiency of ~50% or better was reached during the first 6 years of science operations ...
... HST operates in low earth orbit, at altitudes that have varied from 615 km to the current 565 km [13]. During a typical ~96 minute orbit, it will spend most of its time in pointed astronomical observations. This efficiency of ~50% or better was reached during the first 6 years of science operations ...
System Level # Requirements Document
... These broad science goals have motivated a set of science-driven observatory capabilities and requirements that are described in this document, representing the consensus view of the Science Advisory Committee and the Project Scientist, after consultation with many expert engineers and scientists wi ...
... These broad science goals have motivated a set of science-driven observatory capabilities and requirements that are described in this document, representing the consensus view of the Science Advisory Committee and the Project Scientist, after consultation with many expert engineers and scientists wi ...
Optical Fabrication and Testing - National Optical Astronomy
... In May 2000, the US astronomy decadal review committee recommended the construction of a 30-meter Giant Segmented Mirror Telescope (GSMT) as its highest ground-based initiative In response, AURA formed a New Initiatives Office (NIO) to support scientific and technical studies leading to creation of ...
... In May 2000, the US astronomy decadal review committee recommended the construction of a 30-meter Giant Segmented Mirror Telescope (GSMT) as its highest ground-based initiative In response, AURA formed a New Initiatives Office (NIO) to support scientific and technical studies leading to creation of ...
Slide 1
... Numbers Using Backbones Leif Svalgaard Stanford University 5th Space Climate Symposium, Oulu, 2013 The ratio between Group SSN and Wolf [Zürich, International] SSN has a marked discontinuity ~1882: ...
... Numbers Using Backbones Leif Svalgaard Stanford University 5th Space Climate Symposium, Oulu, 2013 The ratio between Group SSN and Wolf [Zürich, International] SSN has a marked discontinuity ~1882: ...
CFRP composite optical telescope assembly for the 1m ULTRA project
... The optics for this OTA is a classical Cassegrain set. The primary mirror is a 1 m diameter f/3 parabola. The final f/ ratio is 7.6 with the focus located 530 mm behind the primary vertex. The secondary mirror is 343 mm in diameter. The OTA must support an instrument package that will be located beh ...
... The optics for this OTA is a classical Cassegrain set. The primary mirror is a 1 m diameter f/3 parabola. The final f/ ratio is 7.6 with the focus located 530 mm behind the primary vertex. The secondary mirror is 343 mm in diameter. The OTA must support an instrument package that will be located beh ...
Discovery of Cluster-Scale Lensed Quasars using the Subaru
... We are carrying out the Sloan Digital Sky Survey Quasar Lens Search (SQLS). The main purposes of the SQLS are 1) constructing a large statistical sample of lensed quasars and 2) searching quasars lensed by clusters of galaxies, i.e., a new population of lensed quasars. So far we have succeeded in di ...
... We are carrying out the Sloan Digital Sky Survey Quasar Lens Search (SQLS). The main purposes of the SQLS are 1) constructing a large statistical sample of lensed quasars and 2) searching quasars lensed by clusters of galaxies, i.e., a new population of lensed quasars. So far we have succeeded in di ...
FISICA: The Florida Image Slicer for Infrared Cosmology
... mirrors. These cause a near-complete loss of light over ~1-arcsec near the center of each affected slitlet (comprising ½ of all slitlets). While these were somewhat problematic, they can be compensated using standard dither/nod observing techniques. Furthermore, by slightly offsetting the flat field ...
... mirrors. These cause a near-complete loss of light over ~1-arcsec near the center of each affected slitlet (comprising ½ of all slitlets). While these were somewhat problematic, they can be compensated using standard dither/nod observing techniques. Furthermore, by slightly offsetting the flat field ...
6 OPTICS
... For a well baffled optical system, the infrared background of the telescope will depend primarily on the coatings and cleanliness of the primary and secondary optics. The standard coating for most telescopes is vacuum-deposited aluminum. This has the advantage of being a relatively robust coating wi ...
... For a well baffled optical system, the infrared background of the telescope will depend primarily on the coatings and cleanliness of the primary and secondary optics. The standard coating for most telescopes is vacuum-deposited aluminum. This has the advantage of being a relatively robust coating wi ...
Lovell Telescope
The Lovell Telescope /ˈlʌvəl/ is a radio telescope at Jodrell Bank Observatory, near Goostrey, Cheshire in the north-west of England. When construction was finished in 1957, the telescope was the largest steerable dish radio telescope in the world at 76.2 m (250 ft) in diameter;it is now the third largest, after the Green Bank telescope in West Virginia, USA, and the Effelsberg telescope in Germany.It was originally known as the ""250 ft telescope"" or the Radio Telescope at Jodrell Bank, before becoming the Mark I telescope around 1961 when future telescopes (the Mark II, III, and IV) were being discussed. It was renamed to the Lovell Telescope in 1987 after Sir Bernard Lovell, and became a Grade I listed building in 1988. The telescope forms part of the MERLIN and European VLBI Network arrays of radio telescopes.Both Bernard Lovell and Charles Husband were knighted for their roles in creating the telescope. In September 2006, the telescope won the BBC's online competition to find the UK's greatest ""Unsung Landmark"". 2007 marked the 50th anniversary of the telescope.If the air is clear enough, the Mark I telescope can be seen from high-rise buildings in Manchester such as the Beetham Tower, and from as far away as the Pennines, Winter Hill in Lancashire, Snowdonia, Beeston Castle in Cheshire, and the Peak District. It can also be seen from the Terminal 1 restaurant area and departure lounges of Manchester Airport.