... une distance de 6. 6 rayons de la terre (42,000 km soit 26,000 milles), ces satellites accomplissent une orbite par jour , donc tournent avec la terre, et restent toujours au-dessus du m?me point de celle ci. ... terre. ... Encore une autre application est le r?seau de 24 satellites du " Syst?me de Position Global(mondial) " (GPS), sur des orbites circulaires distantes d'environ 4.1 rayons de la terre (26,000 km soit 16,000 milles). ... La derni?re d'entre elle par une bombe t?l?guid?e par GPS. ...

... Still, for earthbound astronomers NGC 5548 is not just another pretty face-on spiral galaxy. Home to some 250 Cepheid variable stars and a recent Type Ia supernova explosion, key objects for astronomical distance determinations , NGC 5548 is one of 8 galaxies used in a new study that includes additional Hubble Space Telescope observations to improve the measurement of Hubble's Constant - the expansion rate of the Universe. ... Nearby Spiral Galaxy NGC 4945 . ... Spiral Galaxy NGC 5033 . ...

... 1944-1946) PRE- NASA CAREER: Tufts University, Medford, Massachusetts Research Assistant, Piezoelectricity Instructor, Physics (1946-1947) National Advisory Committee for Aeronautics, Langley Memorial Aeronautical Laboratory, Hampton, Virginia Research Engineer, Instrumentation (1947-1948) Minneapolis-Honeywell Regulator Company, Minneapolis, Minnesota Electronics Engineer, Industrial Instrument Division (1950) Hastings Instrument Company, Hampton, Virginia ...

... S/ 1981 S 15 174000 S/ 1981 S 16 220000 S/ 1981 S 17 231000 S/ 1981 S 18 185000 S/ 1981 S 19 186000 S/ 1995 S 1 137450 S/ 1995 S 2 139700 S/ 1995 S 3 141050 S/ 1995 S 4 146450 S/ 1995 S 5 140060 S/ 1995 S 6 139910 S/ 1995 S 7 139440 The first two groups are derived from analysis of Voyager 2 data reported in IAUC 6162 ; the third group is from HST observations during the May 1995 ring ... S/1995 S 3 orbits just outside the F ring and is apparently a shepherd moon . ... New Moons ....

As in the last years, the Ephemerides of Minor Planets for 2015 are prepared by the IAA RAS only in the electronic form. ... Orbital elements of all numbered planets have been determined in IAA all over again on the ground of available observations in the catalog of the Minor Planet Center. ... More detailed information on orbital elements used in the present volume of EMP and their accuracy is given in section "Information on new orbital elements". ... a) information on new orbital elements; . ...

As the Universe expands, gravity pulls on the Universe, and slows the expansion down over time. As we look to great distances, we are looking back in time. If we can measure how fast the Universe is expanding in the past, and compare it to how fast it is expanding now, we can see the total gravitational effect of all matter in the Universe. Here we plot the distance between two galaxies as a function of time. ... Universes with lots of material . ...

Communications For Your Astronomy Event . ... In the 1960s, 70s, 80s, and 90s, Ham Radio did a good job of supplying radio systems and operators to assist in the communication needs of organizations. In the good old days, Ham Radio was useful for small events (under a mile radio distance), medium events (under 10 miles) and widespread events using repeaters. ... With the advent of GMRS and especially FRS, the need for Ham Radio for short and medium range event communications has all, but vanished. ...

... Our Galaxy . Milky Way . ... Universe . ... Space Flight . ... Other galaxies are not moving away because they are recoiling in disgust from the Milky Way, but appear to be receding because the Universe is expanding. ... Observers in any galaxy will see every other galaxy as redshifted, so there is nothing special about the Milky Way. ... If the Universe is expanding today, that implies that in the past the galaxies would have been closer together and the Universe was much smaller than it is now. ...

... Images obtained using the Faulkes Telescope South, operated by Las Cumbres Observatory. ... The Faulkes Telescope Project and Las Cumbres Observatory Global Telescope Network had kindly given us the opportunity to use these telescopes and the observatory had booked us four sessions of controlling the telescope in order for us to make some observations on NEOs. ... Just before our first observing session on Friday, we were given a tour of the observatory building and its telescopes, by John McFarland...

Pulkovo NEO Page . Central Astronomical Observatory at Pulkovo . ... Control of Observations . ... NEA Accuracy Estimation . ACCURACY OF THE WORLD NEA OBSERVATIONS . Pulkovo method of accuracy estimation was applied to NEA observations. ... 2005 . 2006 . ...

To main of Laboratory . The research work and design of optical and optical-electronic devices are carries out by laboratory staff: . ... Lens: . ... In the layout 1 prism systems perform functions of dispersive element, corrector of aberrations, optical reducer. ... Spectral range 200 - 400 nm; . ... Back Forward . ... The main corrector's function are compensation of field aberrations of the main spherical mirror of a telescope (diameter of 600 mm, f'=1200 mm) and increase aperture ratio. ...

Winer Observatory P.O. Box 797, Sonoita, Arizona 85637-0797, USA . ... 2/3-m Telescope . ... Site . ... Commanding . ... In a typical robotic observing scenario, each afternoon, a telescope control computer obtains a set of objects to observe from its home institution from a command or script file. ... The file is then transferred to the telescope control computer at the Winer Observatory in Sonoita. ... The Iowa control computer then begins processing the telrun.sls file. ... 2013 Winer Observatory. ...

THE MAIN FIELDS OF MY INTEREST ARE RELATIVISTIC GRAVITATION AND COSMOLOGY . ... The first one is cosmology more precisely the anisotropy of the CMBR (Cosmic Microwave Background Radiation) . In the last paper devoted to the mapping of the CMBR and search for anisotropy we announced the observation of the signal (Strukov et al., ... We discuss the opportunity of explanation of the current observational data in the framework of this hypothesis. ... Some of my papers I devoted to the phenomena. ...

. Comment on J1530-4231 . No detection: the source is probably extended. ATCA observations confirm that the source has a steep spectral index (Tasker, private communication). VLBApls home page . Last modified: 16 Oct 2000

... Events . Educational programs (English) . Educational programs (Russian) . ... Samara region . SSAU History . ... At the opening of the regional stage of the competition IT- breakthrough the agreement on cooperation between SSAU and JSC Russian electronics was signed. The document was signed by SSAU Rector E.V. Shakhmatov and Deputy Director on strategic development and implementation of government programs of JSC Russian Electronics A.V. Brykin. ... e-mail: ssau@ssau.ru . ...

... May 27, 1999 . NGC 4603 and the Expanding Universe . ... Explanation: NGC 4603, a galaxy with majestic spiral arms and intricate dust lanes, is 108 million light-years away. ... In fact, using the Space Telescope to pick out Cepheids in galaxies closer than NGC 4603, the Hubble Key Project Team has recently announced the completion of their 8 year effort to precisely measure galaxy distances and the expansion rate of the Universe - the Hubble Constant. ... About APOD > . ...

Next: Electronic database Up: A Database of Optical Previous: A Database of Optical . ... Many new observational data have been measured in the last years, e.g. by the Infrared Space Observatory in 1995-1998, and interpretation of these spectroscopic data is still in progress. This requires the comparison with data of ``analog materials'' delivered by spectroscopical laboratories. Various terrestrial analogs of cosmic solids have been studied in chemical and physical laboratories. ...

Семинар по гравитации и космологии имени Абрама Леонидовича Зельманова . ... Очередной семинар (? 283 ) состоится в ПОНЕДЕЛЬНИК, 24 февраля 2016 . ... Consequences of the LIGO direct detection of gravitational waves for relativistic astrophysics and gravity theory . ... Direct detection of gravitational waves by the LIGO collaboration has confirmed many theoretical predictions of general theory of relativity and relativistic astrophysics including the theory of black holes. ...

... Tonight's Sky . ... Observing . ... Astronomy for Kids . ... How fast is the universe expanding? Astronomers independently confirm a value for the Hubble constant, a number that reveals the universe's size, age, and eventual fate. ... The Hubble constant, named for astronomer Edwin Hubble, who first observed cosmic expansion in 1929, is one of the fundamental numbers cosmologists use in describing our universe. ... Only registered members of Astronomy.com are allowed to comment on this article. ...

... Russian . The Astronomical Circular (Astronomicheskii Tsirkulyar) is published online by the Eurasian Astronomical Society and Sternberg Astronomical Institute, Moscow State University. ... All papers are refereed. All published papers are indexed in the SAO/NASA Astrophysics Data System . ... See this directory for sample files (template for a paper in English and in Russian , style file , sample figure and sample PDF file for a paper in English and in Russian ). ...