... An overall criterion for standard-star selection is the accuracy needed in the final results: if you need more accuracy, you will need more standard stars. ... While it is possible to get a rough estimate of the extinction by observing different standard stars at high and low airmasses, the relatively large conformity errors in most photometric systems, together with the low accuracy of some standards, make this method very inefficient (see Young [ 10 ], p.178). ...

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Warren Rupp Observatory and the Richland Astronomical Society loves it when our members have talents! In the case of Bob Kocar, he's more than just a great observer and outreach worker.. He does astrophotography, too! ... Warren Rupp Observatory is proud to be associated with these fine groups and endorse these resources.. ... The WRO/RAS was designed and donated by Tammy Plotner - Copyright 2008-2010; Original Content - Tammy Plotner - Copyright 2008-2010; All rights reserved. ...

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... XRB SEDs | ... We would also like to be provided with spectral data in ascii format. ... Commonwealth High School senior, Alex Grant, has developed programs that will take any number of input ascii files (for example 3 [comprising radio, infrared, and X-ray data] or 8 [comprising radio, mmwave, far infrared, near infrared, optical, ultraviolet, X-ray, and Gamma ray data) in any units and combine and convert all to produce one file of Energy Flux (in Hz Jy) vs frequency (in Hz). ...

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Title: A New Model of the Gravitational Lens 0957+561 and a Limit on the Hubble Constant . Authors: Norman A. Grogin , Ramesh Narayan (Harvard Univ.) ... Title: ROSAT/PSPC observation of the distant cluster CL0939+472 . ... Title: Interaction in the Bimodal Galaxy Cluster A3528 . ... Title: Cosmological Implications of Galaxy Cluster Evolution . ... Title: Galaxy Cluster Virial Masses and Omega . ... Matches 201 to 222 from a total of 222 matches for the search pattern galaxy cluster . ...

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Minsk bibliography on light scattering . ... The following resources cover diffferent aspects of light scattering bibliography (often much better than our database): . ... This collection of references cite useful books, many dissertations and papers (with abstracts) of the 50s--90s devided in several categories: DDA, TMM, (layered) spheres, (infinite and finite) cylinders, spheroids, clusters of spheres, ADA, GO and RT/MCM. ... Most of the papers were published from the 60s to 2001. ...

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Eyepieces Forum Message . Forums: . ... Eyepieces ћ Meade ћ Misc. ... Post . ... Re:Decisions, Decisions - Help Requested.. ... Post Message | ... Posted by Jarvis Krumbein on January 14, 2003 18:28:34 UTC . ... Decision Made... - imhotep - January 17, 2003 - 23:43 UTC . ... 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" . ...

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GRANAT is the Russian x-ray sattelite launched to the high apogee orbit (200,000 km) and operated almost for 10 years (1989 -1999) , carrying out four major instruments: French SIGMA coded-mask hard x-ray telescope (30-1000 keV), Soviet ART-P coded-mask telescope (2??-60?? keV), all-sky monitor WATCH (6-150 keV), and a gamma-burst detector PHEBUS . ... Since September 1994, GRANAT is in the survey mode. ... Explore pages devoted to individual GRANAT instruments (including main scientific results): . ...

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• The 6th INTEGRAL Workshop "The Obscured Universe"

Marc White . ... Turbulent entrainment processes may play an important role in the outflows from young stellar objects at all stages of their evolution. In particular, lateral entrainment of ambient material by high-velocity, well-collimated protostellar jets may be the cause of the multiple emission-line velocity components observed in the microjet-scale outflows driven by classical T Tauri stars. ... University of Amsterdam; STARPLAN, Copenhagen, Jul 2013 . ... E marc.white@anu.edu.au . ...

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... Tonight's Sky . ... The Magazine . ... Observing . ... Magazine . ... Sky this Month . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... The quest to understand the Red Planet . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ... Astronomy Magazine ...

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• Groups | Astronomy.com
• NASA releases fiscal year 2013 budget request | Astronomy.com
• Europa mission begins with selection of science instruments | Astronomy.com

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31. Pulkovo Observatory

32. Reading Client Input in Apache 1.2

33. A guided tour to the scheduling of an XMM-Newton revolution

34. Science Innovations