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 . ...

Next: Virtual Observatory Interoperability . ... AstroGrid, a UK e-Science astro-informatics project, with collaborating groups drawn from the major UK data archive centres, is creating the UK's first virtual observatory. ... AstroGrid is one of three major funded world-wide projects (along with the European Astrophysical Virtual Observatory (AVO, Quinn 2002) and US National Virtual Observatory (NVO, Hanisch 2002) which are aiming to create an astronomical Virtual Observatory. ... Astronomy: Models) . ...

Winer Observatory P.O. Box 797, Sonoita, Arizona 85637-0797, USA . ... Asteroid . ... Site . ... The evening of October 26, 2011, Mark Trueblood, Robert Crawford, and Larry Lebofsky used the Kitt Peak 2.1-m telescope to observe Near Earth Asteroid (NEA) 2008 QT3. ... single still jpeg frame . ... The National Optical Astronomy Observatory (NOAO) issued a press release concerning Morgan's work on Monday, November 21, 2011 and posted it on the home page of their web site . ... 2013 Winer Observatory. ...

RADIOASTROPHYSICAL DEPARTMENT • INSTITUTE OF SOLAR-TERRESTRIAL PHYSICS RAS SB . ... SSRT - Receiving systems . The SSRT has two independent receiving systems for recording solar observational data, and several ancillary receivers for checking, setting up and adjusting the instrument. The base receiving systen is a multichannel filter receiver for a simultaneous recording in 180 channels with the 500 kHz band each, adjusted at steps of about 600 kHz. ... Channel's band . ...

... Telescopes ћ Binoculars ћ Microscopes . Meade Ultra-High Transmission coatings (UHTC ) Group . ... Meade Standard Coatings: The optical surfaces of all Meade telescopes include high-grade optical coatings fully consistent in quality with the precision of the optical surfaces themselves. ... These specialized, and extremely advantageous, coatings are offered here as the Meade Ultra-High Transmission Coatings (UHTC) group, a coatings group available optionally on many Meade telescope models. ...

... 331, P 1-10 (1998). Abstract . ... Intergalactic He II absorption and the baryonic content of the Lyman forest . ... 331, P 81-120 (1998). ... 331, P 147-161 (1998). ... 331, P 162-166 (1998). ... 331, P 167-170 (1998). ... 331, P 171-178 (1998). ... 331, P 179-186 (1998). ... 331, P 187-192 (1998). ... 331, P 193-210 (1998). ... 331, P 211-223 (1998). ... 331, P 224-230 (1998). ... 331, P 231-243 (1998). ... 331, P 244-250 (1998). ... 331, P 251-261 (1998). ... helpdesk@link.springer.de ...

... Bad Astronomy . ... Bitesize Astronomy . ... The next step up are true clusters, called open clusters . Open clusters (sometimes misleadingly called "galactic clusters") are groups of stars ranging in size from a few dozen stars up to tens of thousands. ... The youngest is about 1 or 2 million years old, while the oldest is about 6 or 7 billion years, making it just older than our own solar system. ... So by looking at the stars in the cluster we can tell pretty well how old they are. ...

... 9) Oknyanskij V.L. 1994, "Optical-radio time delays in Q0957+561", Odessa Astronomical Publ., ... 11) Oknyanskij V.L. 1994, "Connection between X-ray and optical variability in NGC4151", in Proceedings of Int. Conf. ... 1994. 12) Oknyanskij V.L. 1994, "Connection between X-ray and optical variability in NGC4151", Astrophys. and Space Science, 222, p.157. ... 14) Oknyanskij V.L., van Groningen E., 1997, "Optical spectral variability of NGC4151 in 1990", Astronomical and Astrophys. ...

ABSOLUTE PROPER MOTIONS OF 331 OPEN CLUSTERS . ... The proper motions of stars in the fields of 331 open clusters were taken from Four-Million Star Catalog (4M-catalog) of positions and proper motions (Volchkov et al. ... The absolute proper motions for 21 young open clusters have been derived by comparison of precise relative proper motions of individual stars and their corresponding absolute proper motions. ... Sign of proper motions in RA . ... 0.0001 arcsec/yr . ... rms error in RA proper motion . ...

... Positions and Proper Motions of 258,997 Stars for the Epoch and |Equinox of 1950.0", Publ. of the Smithsonian Institution of |Washington, D.C., No. ... 1971-1979, "Lowell Proper Motion Survey" |(red dwarfs), Lowell Obs. ... LHS |Luyten, W. J. 1976, "A Catalog of Stars with Proper Motion |exceeding 0".5 annually", Publ. of Univ. of Minnesota, |Minneapolis, Minnesota; Luyten, W. J., Albers, H. 1979, "An |Atlas of Identification Chart for LHS Stars", Publ. of Univ. of |Minnesota, Minneapolis, Minnesota...

Measurement of Sky Brightness at the Iranian National Observatory Davoud Afshari1 and Sadollah Nasiri1,2 1Physics Department, Zanjan University, Zanjan 45195-313, Iran; Institute for Advanced studies in Basic Science (IASBS), Zanjan 45195-1159, Iran; Measurement of light pollution 2 Introduction Among 34 candidate sites at the central part of the country, 5 sites namely Garkesh (in Kashan ), Kolahbarfi(in Kashan ), Deynava (in ... One of these is light pollution. ...

... Collaborations | ... Special Astrophysical Observatory of Russian Academy of Sciences (SAO RAS) . ... Lebedev Physical Institute of Russian Academy of Sciences Astro Space Center (ASC) . Moscow, Russia . Institute of Applied Physics of Russian Academy of Sciences (IAP RAS) . ... Institute of Problems of Microelectronics Technology and High Purity Materials of Russian Academy of Sciences . ... A.M. Prokhorov General Physics Institute of Russian Academy of Sciences (GPI RAS) . ... IREE RAS ...

You Can Make Stellar Images Brighter . Articles | ... A few months ago I wrote an article titled "You Can’t Make Them Brighter". So why am I now writing that you can make them brighter. ... The image of a focused star is actually a small disk called the Airy disk, named after the 19 th century scientist Sir George Airy. ... For a given aperture, a smaller Airy disk means that the light is focused to a smaller disk and is therefore brighter. ... www.astronomy.net . About Astronomy Net | ...

To appear in "Fourth Workshop on Robotic Autonomous Observatories (2015)"RevMexAA(SC) METEOR OBSERVATIONS WITH MINI-MEGATORTORA WIDE-FIELD MONITORING SYSTEM S. Karpov, 1, 3 N. Orekhova2 G. Beskin, 1, 3 A. Biryukov3,4 S. Bondar,2 E. Ivanov,2 E. Katkova,2 A. Perkov, and V. Sasyuk3 RESUMEN 2 Favor de prop orcionar un resumen en espanol. ... The faintest detected meteors has the peak brightness about 10 mag, while the ma jority - from 4 to 8 mag. ... 2010; Karpov et al. 2013; Beskin et al. ...

... ISC Kosmotras . ... Dnepr launch record 17 August 2011. ... On 9 September 2009, a contract was signed between ISC Kosmotras and SSTL for the launch of Nigeria-2 and NigeriaSat- у satellites on Dnepr rocket as part of 2010 cluster launch from Yasny Launch Base. According to information provided by SSTL the NigeriaSat-2 satellite is being built for the Nigerian government (NASRDA) as a follow-on to the NigeriaSat-1 satellite that was launched in 2003. ... E-mail: info@kosmotras.ru . ...

... We address a question if globular clusters (GC) in a protogalaxy could for some time evolve chemically as isolated systems, enriching themselves with heavy elements produced in first supernova events that follow initial star formation. We determine both the critical mass of a protoglobular cluster that is needed to retain the ejecta of the very first supernova, and the critical energy (i.e., number of supernovae) that is needed to expel the residual gas from a cluster of a given mass. ...

The new view on the population of Galactic open clusters A.E.Piskunov1, N.V.Kharchenko2, S.RЖser3, E.Schilbach3, R.-D.Scholz4 1 2 3 4 Institute of Astronomy, Moscow, Russia Main Astronomical ... Observatory, Kiev, Ukraine Astronomisches Rechen-Institut, Heidelberg, Germany Astrophysikalisches Institut Potsdam, Germany What are open clusters and what do they teach us Groups of Population I ... Cluster complexes: OCC-1 = Gould's Belt cluster complex? ...

Find Similar Abstracts . ... Giant voids in the universe . ... ASTRONOMICAL MODELS, GALACTIC CLUSTERS, GALACTIC EVOLUTION, GALACTIC STRUCTURE, SPATIAL DISTRIBUTION, UNIVERSE, ADIABATIC CONDITIONS, COSMOLOGY, MASS DISTRIBUTION, NEUTRINOS . ... Use: Authors Title Abstract Text Text Query with Keywords Return: Query Results Query Form Database: Astronomy Instrumentation Physics and Geophysics ABSTRACT QUERY USER FEEDBACK HELP ...

... Contacting and discussing with people sharing your interests, participating in night sky observations with telescopes as well as a large choice of astronomical books, magazines and video-tapes out of our club library. ... A reasonable compromise for observing both planets and brightest deep sky objects ( nebulae, galaxies) are either a 4 to 8 inch mirror telescope ( Newton, Schmidt-Cassegrain ) or a 3 to 4 inch refracting ( lens) telescope. ... Where can I buy a telescope in Luxembourg ? ...

PLANCK -, - . Planck. Planck Collaboration, «Planck intermediate results. ... Evidence of unbound gas from the kinetic Sunyaev-Zeldovich effect», Astronomy & Astrophysics, in press, arXiv:1504.03339 Planck Collaboration, «Planck intermediate results. ... Optical identification and redshifts of Planck clusters with the RTT150 telescope», Astronomy & Astrophysics, 582, A29 (2015) Planck Collaboration, «Planck 2013 results. ...