Paolo Padovani , II Universit di Roma , Paolo Giommi , ASI, SDC and Fabrizio Fiore, ASI, SDC and Osservatorio Astronomico di Roma . Original Version: MNRAS, (1997), 284, 569 . Text copyright (c) 1997. ... We study the X-ray spectra of 114 flat-spectrum radio quasars (FSRQ) using the hardness ratios as given in the WGA catalogue of ROSAT sources. ... We find that FSRQ have a distribution of energy spectral indices ranging between 0 and 3 with a mean value alpha_x ~ 1. ... Figure 1 (13kb) . ...

The Python programs offered here result from the development of methodology for processing image data with high precision, in a flexible command line system useful for astronomical and laboratory image processing. ... Alsvid is efficient in robotic and automated or scripted server processing of astronomical images, and also in interactive command line processing for research and visualization. ... In large part it replaces IRAF and IDL when scripted image processing is required. ...

The Arcetri Spectral Code (Landi and Landini 1998) allows to evaluate the spectrum of continuum and line radiation emitted by hot and optically thin plasmas in the spectral range 1-2000 Angstrom. The Code is composed by a large database of atomic data and transition probabilities for calculating spectral line emissivities and a suite of fortran programs able to evaluate free-free, free-bound and two-photon continuum radiation. ... To get he Arcetri Spectral Code related publications . ...

... October 6, 15:00 15:40 . ... PDF [2.3б MB] October 6, 15:40 16:30 . Warren Skidmore (TMT), Reed Riddle (TMT), Angel Otarola (TMT), Sebastian Els (TMT), Tony Travouillon (TMT), Matthias Schoeck (TMT), R. Dahl (ISIS), D. Naylor (ISIS), R. Querel (ISIS) . The results of the characterization of precipitable water vapor (PWV) in the atmospheric column carried out in the context of identifying potential sites for the deployment of the Thirty Meter Telescope (TMT) are presented. ...

SAI VO . ... SAI CAS . ... Access . ... We present the results of the development of Sternberg Astronomical Institute Catalog Access Services (SAI CAS) project - the first and the only project in Russia, which provides online access to the major astronomical catalogues and different services on top of them. ... SAI CAS is an open-source implementation of the general Catalogue access service (influenced by SDSS CAS CASjobs project), based on original algorithms and open-source software. ... SAI MSU | ...

... adass@eso.org . ... c/o Britt Sj?berg . ST-ECF/ESO . ... European Southern Observatory . ... The ADASS '97 Program Organizing Committee is comprised of the following members: Rudi Albrecht (ST-ECF/ESO), Roger Brissenden (SAO), Tim Cornwell (NRAO), R. Crutcher (Uni. of Illinois), F. Rick Harnden - Chair (SAO), George Jacoby (NOAO), Jonathan McDowell (SAO), Jan Noordam (NFRA), Dick Shaw (STScI), Richard Simon (NRAO), Britt Sj?berg (ST-ECF), Doug Tody (NOAO), and Dave Van Buren (IPAC). ...

... It has been largely superceded by MatWeb . Conversion Factors . Material properties . Physical constants . Astronomical constants . This table gives conversion factors to convert various units to their SI equivalents. ... The units are SI. This is a short list of physical constants in SI units. ... Boltzmann constant . ... Gas constant . ... Mass . ... Plank's . ... Radiation constant . ... This is a short list of astronomical constants in SI units. ... Sun . ...

... Library . ... The New Hampshire Astronomical Society's Library Telescope Program . Marc Stowbridge . ... Our guest speaker this month is Marc Stowbridge, of the New Hampshire Astronomical Society. Marc was the brainchild behind the NHAS Library Telescope Program – an outreach effort to supply user-friendly loaner telescope to local libraries. ... A lifelong interest in amateur astronomy led to his joining the NHAS in 1999. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

. Distance Conversion Calculator . by Matt Oltersdorf 2000 04 02 2225 UTC . Type the known value into the appropriate units field, click the . calculate button and the program will show all values for . related unit properties. Kilometers . Meters . mm . Inches . Feet . Yards . Miles . Astronomical Units (A.U.) . Light Year (LY) . Parsec (pc) . Kilometers . Miles .

Databases (NSDC) of the Natural Planetary Satellites. ... NSDC: Database of astrometric observations of Natural Planetary Satellites . ... They are thoroughly looking for observations in different sources, creating their owndatabases which are then mostly inaccessible to other researchers. ... In the file "content" with explications, the reference is given to the data source as well as the bibliographic reference. ... Data sources. ... Why a specific bibliographic database for Natural satellites? ...

Magnetic Stars, 2011, pp. ... It follows, in particular, from Fig. 1a, where points show the central intensity of line in 2008 ­ 2009, and asterisks -- the ELODIE Archive (EA) spectra in 2002 ­ 2003 smoothed to the resolution of the MSS. ... Figure 2a demonstrates the distribution of temperature in the atmosphere in the phase = 0.07 and Fig. 2b -- in the phase = 0.53 of the rotation period, obtained from the hydrogen line profiles in 2008 ­ 2009. ...

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... Home Education Outreach Program to Schools . ... Lecture Series 2014-2015 . ... Outreach Program to Schools . ... Clear Sky Chart . This Month's Sky . ... This Month's Sky - 2015 . This Month's Sky - January 2015 . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

... В четверг, 14 апреля 2016 г., состоится семинар кафедры астрофизики. Повестка дня . ... Начало в 11 час.15 мин. Ауд. ... В четверг, 31 марта 2016 г., состоится семинар кафедры астрофизики . ... В четверг, 24 марта 2016 г. , состоится семинар кафедры. ... В четверг, 17 марта 2016 г. , состоится заседание кафедры. ... ОСП НИИ ПММ Национального исследовательского Томского государственного университета) . ... Copyright 2016 Астрономия в Санкт-Петербургском университете . ...

... 13, Moscow 119992, Russian Federation, e-mail: busarev@sai.msu.ru; 2 Research Institute Crimean Astrophysical Observatory, p/o Nauchnyi, Crimea 334413, Ukraine, e-mail: prok@crao.crimea.ua Summary: We propose a combined method of astronomical investigations of small or distant planets incorporating registration of a set of integral spectra of an object and their frequency analysis. ... An application of the method is shown on example of asteroid 21 Lutetia. ... 6] Busarev V. V. (2002), Solar Sys. ...

... There are preliminary series of photometric and radio spectral observations of the above-mentioned stars, archival data on the light curves of the stars, results of the search for OH and H 2 O maser emission in IRAS point sources that possess the IR parameters similar to Miras. ... The aim is a detailed study of the maser emission variability. ... In 1996-1997, astronomical observations of Mira Ceti-type stars (miras) were carried out in three spectral ranges: optical, infrared, and radio. ...

Automatic Detection of NEOs in CCD Frames . ... CCD frames obtained with modern telescopes with robotic operation allow carrying out standard observation programs for detection of peculiar objects on stellar backgrounds, as is the case of Near Earth Objects (NEOs). ... In this paper, we present original algorithms for automatically detecting dim NEO images in telescope frames, considering both sidereal and differential tracking [2]. ...

... Therefore, the observatory supports educational events, occured in the SAO, including astronomical and astrophysical schools, lectures and excursions at the SAO's telescopes. ... Thursday 9-00 Breakfast 9-30 Opening of the School and Astronomical Olimpiad 10-15 Photo of particapants (near the SAO entrance) 10-30 Lecture about Specail Astrophysical observatory. Chentsov E.L. 13-30 Lunch 14-00 Excursion to historical places of Nizhnij Arkhyz 18-00 Dinner 19-00 Acquaintance evening. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Earth Satellites . ... According to Velikovsky, about 4000 years ago a giant volcano on Jupiter erupted and spewed a vast glob of debris into space, leaving the Great Red Spot behind as a permanent scar. The red hot lump ejected from Jupiter (referred to as a comet by Velikovsky) wandered into the inner Solar System, repeatedly crossing the Earth?s orbit and in fact often passing close to our helpless planet in the following millennia. ...