Precision Telescope Control System PTCS Project Note 51.1 A Preliminary Analysis of the Correlation Scales of Wavefront Errors of the GBT Using the Moon Bojan Nikolic, Dana S. Balser & Richard M. Prestage 27 June 2006 GBT Archive: PR063 File: PROJECTS Keys: PTCS, OOF Abstract Observations of the GBT error beam are performed using the Moon to explore the spatial scales in the aperture plane over which the dominant wavefront errors are correlated. ... The expected observed scan is shown in Figure 7. ...

... Archives . ... One of the biggest culprits is the unit of energy, [keV], which is 1000 electron Volts, for the energy acquired by an electron when it falls through an electric potential of 1 Volt: . ... Then, a temperature in degrees Kelvin can be written in units of keV by converting it with the formula . ... It is tempting to put the two together and interpret a temperature as a photon energy. ... For example, a 1 keV (temperature) Bremsstrahlung spectrum extends out to 1 keV (photon energy). ...

ATM Forum Message . ... Atm ћ Astrophotography ћ Blackholes ћ Blackholes2 ћ CCD ћ Celestron ћ Domes ћ Education . ... Post . ... Replacement Servo . ... Post Message | ... It matters if it says Tasco or Celestron. ... If it Tasco, Celestron is unlikely able or willing to help. ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... More information on books, telescopes, clubs, etc. is available in the Getting Started section. ... For more information call 617-495-7461. Boston University Astronomy Department - Public telescopic observing is held every clear Wednesday night. ... Boston Museum of Science - For more information and admission prices call 617-723-2500. ... For information and admission prices call 508-929-2700. ... Springfield Telescope Makers , VT. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

XMM ­ Newton CCF Release Note XMM ­ CCF ­REL­26 Effective area of the X­ray telescopes P. Gondoin October 5, 2000 1 CCF components Name of CCF VALDATE List of Blocks changed CAL VERSION XSCS flag XRT1 XAREAEF 0007 2000 ­01­13T00:00:00 ONAXISXAREAEF, VIGNETTING Cal 3.80, xmm ­ sas 20000903 1900 NO XRT2 XAREAEF 0008 2000 ­01­13T00:00:00 ONAXISXAREAEF, VIGNETTING Cal 3.80, ... Report of the in­flight vignetting calibration of the MOS cameras aboard the XMM­Newton satellite. ...

... We are developing and integrating software to simulate the focal plane detectors, shutters, and gratings for the Advanced X-ray Astrophysical Facility (AXAF). ... The simulations are currently being used for planning calibration activities, on-orbit performance prediction and for testing the analysis and telemetry software. ... The models, being developed as part of the AXAF Science Center, are being used to aid in calibration planning and to characterize the performance of the AXAF observatory. ...

... The then president of the Society, Mr. Robert Burke, appointed a committee of eight or ten members, most of whom had made smaller mirrors, as an instrument committee, with Mr. Thorpe as chairman. ... Seriously, the best practicable solution seemed to be to build a machine to do the grinding and polishing. ... It was decided to grind the edges of the mirror to make it truly circular, as the rough cast glass was some 3/8 inch longer on one diameter than on the other. ...

... Energy Source: any electrical, mechanical, hydraulic, pneumatic, chemical, thermal, or other energy source that causes injury to personnel. ... Lockout Device: a device that utilizes a positive means, such as padlock or stationary- (built-in) type lock, to hold or secure an energy-isolating device in the safe position and prevent the energizing of a machine or equipment, or associated component. ... The energy-isolating devices may be operated and the machine or equipment returned to normal...

... ASRAS HOME . ... Mees Observatory . ... Site . ... Weather forecast will be correct for the Farash Center . ... Through gracious donations from Marion and Max Farash and the Louis S. Wolk Foundation, ASRAS has been able to acquire a large piece of land well away from the city lights. ... The Marian and Max Farash Center for Observational Astronomy consists of an education center, maintenance building and 6 working observatories on a 17 acre plot of land just off route 64 in the hamlet of Ionia, NY. ...

... Марс 1 . Orbiter . ... Lander . ... 10 Feb 74 . Прошел мимо Марса, передал снимки . ... Successful orbiter . ... 5 Aug 73 . ... Прошел мимо Марса . ... Марса-3 . ... Марс-1 (частично виден) на блоке Л Марс-3 . спускаемый аппарат Марса-3 . ... аппаратов Марс-2.. ...

GENERAL INFORMA T ION ABOUT How does my LOMO® Night Vision Device Work? ... LOMO® NIGHT VISION DEVICES & FAQs When using a Night Vision Device, you are actually looking at an image that is projected by the intensifier tube located inside the unit (Fig. ... Light enters the Night Vision Device through the objective lens and hits the photocathode in front of the intensifier tube. ... Infrared (IR) Illuminator Microchannel Plate (Gen.2 Only) When do I use my LOMO® Night Vision Device? ... Fig. ...