... 5 1/ 2 Closing the feedback lo op: 1st option · Feedback efficiency 2NepEep f = Lp 4 3 w1 R 3 E1 w2 c E2 ( Eep E1 if E1 E2) · Pair pro duction rate Nep = · Soft (synchrotron from secondary pairs ) photon field: Eep 2 eB E2 1/2 f w w b , w2 = Es = 4 Es 2 mec2 mec · Hard ( inverse Compton from primary pairs ) photon field: 2 2 wb 3 R w1 , E1 = 3 2Ts wb = 4 R T ct 0 0 mec2 wb is thermal background energy density ...

... 8, ``Celestial Mechanics'', 2002 Estimation of masses of some minor planets from observations of perturbed bodies O. M. Kochetova Institute of Applied Astronomy, St. Petersburg, Russia The most straightforward method of mass determination of minor planets is the dynamical one which uses the gravitational perturbations produced by minor planet in the motion of other bodies. ... The values of the masses of minor planets (15), (29) and (65) appear to be rather close in both papers. ...

... Tidal influence on each of the galaxies in our sample is quantified by identifying and measuring the distance to the nearest companion, using a photometric technique with good completeness characteristics. ... Massnormalised starformation rates were derived using galaxy stellar masses estimated from zband luminosities Nearest companions were identified using the algorithm illustrated in Figure 1. ... Some of the lowredshift galaxies in our sample with close companions are illustrated in Figure 3. ...

Astronomy Articles . Articles | ... Moon | ... Astronomy Binoculars - The Skies The Limit - by Scott Gray, September 2006 . ... Astronomy Terms - To Help You Study The Universe - by Scott Gray, October 2006 . ... Himalia is the only moon other than Europa, Ganymeade, Callisto and IO visible with small telescopes. ... The Harvest Moon refers to the Full Moon that comes closest to the autumnal equinox, or the first day of autumn. ... Think the study of stars is best left to professional astronomers? ...

The revision of the MASS/DIMM star catalogue N. Shatsky, V. Kornilov March 16, 2008 Abstract The compilation of the (updated) version of the MASS (MASS/DIMM) device target catalogue is described. ... Then the list was cleaned according to following criteria: I. Remove stars too faint for a MASS device. ... Here the color equation of the Sternb erg device was taken: M AS S mag = V mag + 0.45 (B - V ); stars with M AS S mag > 3.2 were removed. ... This was made based on the GCVS4.2 catalogue data. ...

Asteroid 2055 YU55 passes close by Earth; how close did it get? ... As Elizabeth Flock reported: An asteroid the size of an aircraft carrier missed Earth by only 200,000 miles as it flew by Tuesday night the closest an asteroid has been to Earth in 200 years Asteroid 2005 YU55, as it has been dubbed, streaked by at about 30,000 mph, but some scientists and lucky amateur astronomers caught a glimpse in their telescopes, where they saw strange structures on the asteroid\u2019s dark-colored surface. ...

General Information . ... The conference is organized by the Sternberg Astronomical Institute (SAI) of Moscow University and the IAU Working group "Site-testing Instruments" . ... Use of site data in telescope operation and adaptive optics. ... Recent conferences on this subject (2007, 2008) demonstrated great interest of the community, hence the need for a new meeting. ... Unlike previous recent conferences, this meeting will cover all aspects of site monitoring for optical/IR astronomy. ...

... We present a pro ject of an Information system on binary stars (ISBS). ... Stars from the following catalogues will be included in the first version of ISBS: Catalog of orbital elements , masses and luminosities of close double stars ( Svechnikov Bessonova 1984); The catalogue of approximate photometric and absolute elements of eclipsing variable stars ( Svechnikov Kuznetsova 1990); The catalogue of orbital elements , masses and luminosities of detached main-sequence ...

THE ARGUMENT AGAINST LONG EXTRAGALACTIC DISTANCE SCALE Gaseous discs of S0 -- Sd galaxies appears to be gravitationally stable or close to stability. Dependence of the gravitational stability parameter of gaseous disc $M_g/M_c$ upon the color index $(B-V)^0_T$ which reflects a relative number of young stars, is found. Here $M_g$ is total mass of gas in a galaxy, $M_c$ - mass of gas which corresponds to marginal stability of gaseous disc at distances from center. ...

... Observing . ... Solar Observing . ... April 3 (SUN) - Solar Observing, Central Park , Manhattan . ... APRIL'S SKY . ... Lecture Series at the American Museum of Natural History The Amateur Astronomers Association is proud to present an astronomy lecture series from October through May each year for our members and the .. ... The€аAmateur Astronomers Association of New York€аwas organized in 1927 to promote the study of Astronomy, emphasizing its cultural and inspirational value. ...

... Удивите ваших близких таким неожиданным и интересным подарком, ведь необычные подарки покоряют с первого взгляда. ' title=' Светильник подвесной MARIMI pendant nickel 5x20W 230V Massive 40655/17/10 - MassiveСветильник подвесной MARIMI pendant nickel 5x20W 230V Massive 40655/17/10' border='0' align='left' width='120' style='margin-right: 20px;' hspace='7' vspace='5'/> . ...

... St Petersburg 23, September 2014 1 Motivation · Origin of Martian moons? ... Considered error sources: ­ Phobos a priori ephemerides; ­ Phobos a priori GM value; ­ measurements noise; ­ different strategies; · Methods: ­ real data analysis; ­ simulations. ... St Petersburg 23, September 2014 8 Simulations: sensitivity of the measurements to the a priori GM value Simulations: zero noise+ IMCCE a priori ephemerides +GMPH = 7.16 * 105 m3/sec2. ... St Petersburg 23, September 2014 14 Thank you! ...

... Abubekerov M.K., Lipunov V.M. "The Lower Temperature Limits Of Accretors" Astronomy Reports, 2003, Vol. 47, Issue 8, pp.679-684. ... Abubekerov M.K., Antokhina E.A., Cherepashchuk A.M. "The Masses of X-ray Pulsars in Binary systems with OB Supergiants" Astronomy Reports, 2004, Vol. ... Abubekerov M.K., Antokhina E.A., Cherepashchuk A.M., Shimanskii V.V. "The Mass of the Compact Object in the Low-Mass X-ray Binary 2S 0921-630" Astronomy Reports Astronomy Reports, 2006, Vol.50, Issue 7, pp.544-552. ...

... Projects . ... Space Projects . ... Closed . ... Complex Orbital Magneto-plasma Autonomous Small Satellite . ... 1991-1999) . ... Complex Orbital Near-Earth Solar Observations (1994-2001) . ... Active Plasma Experiments (1991-1999) . INTERCOSMOS 19 : launched February 27, 1979 . ... Интеркосмос-25 (АПЭКС) (1991-1999) . ... Интеркосмос-19 (1979-1982) . Интеркосмос-18 (1979) . Цикада (1979) . ... Марс-3 (17.05.1971) . ... Электрон-4 (1964-1965) . ... Космос-49 (1964) . ... 1962) . ...

... Module Crystal was launched from Baikonur on May 23, 1990 by the LV Proton-K. The total length of the module is 11.9 m; maximum diameter 4.3 m; mass at the launch 19500 kg. ... It has two panels of the solar batteries with the area equal to 72 m 2 (8.4 kW). They are of a new modification (repeated opening/closing is admissible) and one of them is transferred to the module Kvant. ... Besides, it has two additional docking ports for interaction with the reusable ships (Buran, later - Shuttle). ...

Dust around Herbig Ae/Be Stars: Porous, Cometary-like Grains? ... This brings up the question, which we try to answer here, of how the grain porosity affects the observational manifestations of the dust shells of HAeBe stars: the excess infrared emission, anomalous extinction in the ultraviolet, and the peculiar behaviour of colour indices and linear polarization during deep brightness minima observed for about 25% of HAeBe stars (UX Ori, WW Vul, etc). ...

... 03-12-2003 21:00 Rambler Mass Media . Новые изображения поверхности Марса надеются получить в начале следующего года американские ученые с помощью аппаратов Spirit и Opportunity, отправившихся 10 июня и 7 июля в космическое .. ... Космический зонд StarDust сфотографировал комету Wild-2 . ... Международной космической станции исполнилось пять лет . ... Космический аппарат Voyager 1, запущенный NASA более 26 лет назад достиг границы Cолнечной системы. ... На Землю падают обломки кометы Энки . ...

... Club By-laws . ... Other Club Activities . ... Public Nights . ... Dr. James Green, NASA, Director Planetary Science will be our esteemed speaker on Tuesday, April 12, 2016 at 7:30 PM in Peyton Hall on the Princeton University campus. ... Our astronomers setup telescopes for public use at Communiversity in Princeton, Super Science Saturday at the NJ State Museum in Trenton and at various public events around Mercer County. ... Amateur Astronomers Association of Princeton, Inc., ...

... In the table given at a separate sheet enumerate in growing order (from 1 to 13) the size and the mass of each object: Milky Way Galaxy, Andromeda Galaxy, Neutron star, Electron, Mercury, The first satellite "Sputnik I", Venus, Pluto, Proton, Red dwarf, Black cat, White (Polar) bear, the Sun. ... Star setting. ... Comet Lovejoy. ... Radio- (operating wavelength is about 21 cm) and optical (operating in the light visible to the naked eye) telescopes have been used to study an astrophysical object. ...

Distant globular clusters with anomalously small masses. ... We found that 10 metal-poor globular clusters are greately distinguished for anomalously small masses on the "destruction rate-mass" plain. ... Note that 10 distant clusters of anomalously small mass selected by us proved to be younger and with an average metallicity <[Fe/H]> = -1.36 ? ... It looks as if only far from the centre of the Galaxy, conditions are created that lead to formation of globular clusters with anomalously small masses. ...