Jean-Bernard ZUBER (LPTHE, Paris-6 Jussieu): Matrix integrals and knot theory . Physicists have developed diagrammatic techniques, known as Feynman graphs, to deal with integrals with Gaussian weights. When applied to integrals over Hermitian matrices, this also allows to control the topology of the graphs, and to write for example generating functions of the numbers of planar objects. This will be illustrated on the counting of "alternating" links and tangles.

... Observations . Objects . ... Canis Major . ... Canis Minor . ... Leo . ... Leo Minor . ... Ursa Major . ... Ursa Minor . ... Herschel 2500 . ... Herschel 400 (I) . ... Globular Clusters . ... AL Globular Club . ... AL Planetary Club . ...

... The ESO Conference "Towards Other Earths: DARWIN/TPF and the Search for Extrasolar Terrestrial Planets" (Germany, Hidelberg, 2003), V.P.Grinin, L.V.Tambovtseva,"Dusty disk winds in the young binary systems with the low-mass secondary components" . ... Barsunova, V.P. Grinin, S.G. Sergeev, "Unusual eclipsing system KH 15D: new photometric data", oral . ... Barsunova, V.P. Grinin, S.G. Sergeev, L.V. Tambovtseva, "Photometric activity of the peculiar young stars", oral . ... V.P. Grinin, N.Ya. ...

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... Elena Seifina and Lev Titarchuk "On the nature of the compact object in SS433: observational evidence of X-ray photon index saturation" 2010, Astrophysical. ... A.M. Cherepashchuk, R.A. Sunyaev, E.V. Seifina, E.A. Antokhina, D.I. Kosenko, S.V. Molkov, N.I. Shakura, K.A. Postnov, A.N. Timokhin, I.E. Panchenko "INTEGRAL Observations of SS433: Analysis of Precessional and Orbital X-ray Periodicities" 2007, 6th INTEGRAL Workshop, Eds. S. Grebenev, R.A. Sunyaev, p.411 (astro-ph/0610235) . ...

... Meade Instruments Corporation . ... Autostar Computer Controllers . 497 Autostar . ... One of the most important advances in telescope control in the past 25 years, the Meade #497 Autostar Computer Controller turns the ETX into an automatic celestial object locating system. ... The #497 Autostar Computer Controller plugs into the control panel of ETX-90EC, ETX-105EC, and ETX-125EC telescopes and enables automatic location of more than 30,000 celestial objects. ... about meade | ... Meade 4M | ...

... The vertical and slanted dashed lines in the first panel mark the separation distinguishing are as occupied by thick-disk objects according to Hanson et al. (1998) and Martin, Morrison (1998) , respectively. An abrupt change in the dispersion near V res 290 km/s (the vertical dashed lines) is apparent in all panels except the first. discussion in the text | next figure | privious figure . ...

... title='Arzberg Form 1382 weiss Тарелка подстановочная 31 см - Arzberg - Arzberg' border='0' align='left' width='120' style='margin-right: 20px;' hspace='7' vspace='5'/> . Цвет: CORAL KISS . ... Модель: BEATTY . Сезон: SS14 . ...

International conference . ... 2009 . First announcement . Conference page | ... The Russian Academy of Sciences, the Russian Foundation for Basic Research, Saint Petersburg Scientific Center of RAS, the Institute of Applied Astronomy of RAS invite you to participate in the International scientific conference Asteroid-Comet Hazard-2009 which will be held 21-25 September 2009 in St. Petersburg. ... Top of page . ... Institute of Applied Astronomy of RAS, Russia . ... The Conference ACH-2009 . ...

... The project assumes creation of an international space observatory - the interferometer "Earth - Space - Space" in order to perform of astronomical investigations in millimeter, submillimeter and infrared regions with extremely high sensitivity (to a few nanoJanskies units of flux density in continuum spectrum) and extremely high angular resolution (to a parts of microsecond of arc or, possibly, nanosecond). ... radio-interferometric channels of the system "Space - Space", region 0.2 - 3 mm; . ...

... CURRENT ASPECTS OF REMOTE SENSING OF EARTH FROM SPACE . ... For developing of the scientific concept and the programs of global monitoring of the Earth from space and pursuant to the disposal of Presidium of Russian Academy of Sciences # 10310-717 (August 11, 2004 ) Space Research Institute RAS and Center of Space Observations of the Russian Space Agency during November 16-18, 2004 conduct the Second Opened All-Russia conference ' Current Aspects of Remote ...

... Asteroid . ... In case you didn't hear about it, which you probably didn't: On Jan. 7, an asteroid 1,000 feet across -- nearly three times the current diameter of Marlon Brando -- barely missed the Earth, which is most likely your planet of residence. ... What if this asteroid had hit the Earth? ... As it happens, the American Astronomical Society was holding a conference in Washington AT THE VERY SAME TIME as the asteroid nearly hit the Earth. ...

Supernova discovery statistics for 1999 . ... Sorted by Name For the year 1999 , 198 supernovae and 11 extragalactic novae were reported. 198 of these supernovae were named by CBAT, 0 were given possible supernova designations, and 0 were not reported to CBAT. 49 supernovae were found in NGC/IC galaxies, 84 were found in named galaxies 64 objects were discovered by amateurs 0 were brighter than 13th Magnitude 21 were brighter than 16th Magnitude 65 were brighter than 18th Magnitude 115 ...

... Shustov B.M., Wiebe D.S. Dust expelling from the Galaxy ( abstract from the journal ). Astronomy Reports , 1995, 39 , 578-586 [AZh, 72 , 650-659]. Wiebe D.S., Shematovich V.I., Shustov B.M. Chemical and dynamical evolution of protostellar clouds: initial stages of collapse ( abstract from the journal ). ... Shustov B.M., Wiebe D.S., Tutukov A.V. Evolution of disk galaxies and loss of heavy elements into the intracluster medium. ... ApJ (Letters), 1998, 503 , L71-L74 ( astro-ph/9806155 ). ...

Andromeda Nebula. In the XVIII century the great English astronomer William Gershel included this galaxy into the observed stars congestions. ... What is this nebula interested for? It is a great spiral galaxy 1,5 times more than our galaxy - The Milky Way. The Milky Way and Andromeda Nebula are the greatest objects of the local group of galaxies. ... Andromeda Nebula is not the nearest galaxy to ours but its structure looks like the structure of our Galaxy. ...

... We present preliminary results from two programs to image the host galaxies of radio-quiet quasars in 1.6 micron light using NICMOS camera 2 on HST. The high redshift program consists of QSOs covering the redshift range 0.8 < z < 4.4 and a range of QSO luminosities. Of the six objects for which data have been obtained the results range from no host galaxy detected, to an obvious galaxy with an interacting companion, to a possible high redshift galaxy cluster. ...

Тема : Messier 31 Andromeda Galaxy (M31) - спиральная, сейфертова галактика Туманность Андромеды (NGC 224) в созвездии Андромеда (Andromeda) .. ... Туманность Андромеды, она же Messier Object 31 глазами любителей астрономии .. ... Вторая галактика в созвездии Андромеды ( Andromeda ) .. ...

Map and Constallation Key to Messier Objects for TELRAD Finders Messier Object Constallation Taurus Aquarius Canies Venatici Scorpius Serpens Scorpius Scorpius Sagittarius Ophiuchus Ophiuchus Scutum Ophiuchus Hercules Ophiuchus Pegasus Serpens Sagittarius Sagittarius Ophiuchus Sagittarius Sagittarius Sagittarius Sagittarius Sagittarius Sagittarius Scutum Vupecula ... Nebula Open Cluster Glob. ... Cluster Sunflower Galaxy G-Spiral G-Spiral G-Spiral G-Spiral Open Cluster Glob. ...

... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

... Here are some tips on how to get the best guiding out of our current system. ... NA2 Guider Tips . ... Optical double stars, late-type galaxies, and bipolar PNs may pose a problem for guiding, as will objects where you desire to observe a position away from the bright center (e.g., SNs near bright galaxies). ... Field Star is good if your object is too faint or asymmetrical for Boresight guiding, or if you need the slit to be off-center. ... Use Field Star guiding almost always. ...