... Stellar magnitudes, provided by observations in an optical band, are reduced to the units of erg/cm /s as follows: . ... Table: `Zero-points', central wavelengths, and effective widths of optical bands (Zombeck's Handbook, 1990). - the corrected value (the handbook value is given in parentheses). ... We have achieved coincidence between theoretical values by Bochkarev et al (1991) and ours, obtained with rectangular shapes of transmission band of optical filters. ... 1991, V. 1, P. 41. ...

... October 4, 1999 . The 220 Mirrors of CRTF . ... Explanation: Even the largest of modern optical telescopes are small when compared with the light gathering power of the Central Receiver Test Facility (CRTF) located in New Mexico , USA. CRTF has 220 mirrors each over 7-meters in diameter all focused on a single tower. ... Recently, astronomers with the STACEE project have begun using CRTF to collect secondary light emitted when high-energy gamma rays strike the Earth's atmosphere. ...

Peter Scheglov ­ pioneer of site testing in the Central Asia A.Tokovinin & V. Kornilov Promote astronomy iin the Promote astronomy n the Central Asia Central Asia Tashkent P..Scheglov iidentified CenttralAsiian siites wiith PScheglov dentified Cen ral Asan stes wth a llarge ffraction off cllear sky and callm attmoa arge raction o cear sky and cam a mospherre, iin colllaboration wiith metteorologists. sphe e, n colaboration wth me eorologists. ... Problems of optical astronomy). ...

Fig. ... Photograph of the Pleiades cluster by E. E. Barnard (1927) , courtesy of the Carnegie Institution of Washington. ... Top left: central cluster in red (POSS E) filter. Top right: central cluster in blue (POSS O) filter. ... Stars on the east side of the cluster generally exhibit E(B-V) ~ 0.03. ... Single underscores represent lower column densities of N (CH + ) ~ 5x10 12 cm -2 . ... Fields and pointings of thesis observations: The WISP field is indicated by the 5њ x 1.7њ diagonal box. ...

... Gallery . ... Sidebar Left . Sidebar Top . No Sidebar . Sidebar Bottom . Sidebar Right . ... Title: The frame for the central walkway . Description: NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. ... The frame for the central walkway NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. Powered by Gallery 3.0.9 (Chartres) . ...

... ESO workshop on The Origins of Stars and Planets: The VLT View . ESO Astrophysics Symposia XXVII (2002) . ... As an example, we present K'-band bispectrum speckle interferometry images of the the deeply embedded young stellar object S140 IRS 1. ... We discuss the implications for the nature of the central source. bloecker@mpifr-bonn.mpg.de. ... Back to Group Home Page ...

Next: Carbon stars Up: OTHER HYDROGEN-DEFICIENT STARS Previous: Extreme helium stars and . V348sgr may be more closely related to about twenty hydrogen-deficient central stars of planetary nebulae which have similar carbon abundances ( ) and strong emission line spectra ([ Leuenhagen et al. 1995 ], [ Leuenhagen & Hamann 1997 ]). ... Hydrogen-deficient and carbon-rich knots are seen in the inner nebulae of at least two objects (Abell 30 and Abell 78). ...

... HOME . ... MICROSCOPES . ... Home Products Microscopes Multiscopes EA-5 attachment . EPI-BRIGHTFIELD / DARKFIELD / POLARIZATION (EA-5) ATTACHMENT . ... For contrast enhancement, two filter slots accept the three included filters (green, blue and yellow]. ... The EA-5 Epi-lllumination attachment is used with high-performance Achromatic Epi-Objectives able to act as their own Darkfield or Brightfield condenser, therefore allowing quick change between contrast techniques. ... Field Flatness . ...

... a positive central nucleus , where most of the atom's mass is concentrated, and . one or more negative electrons . Nucleus and electrons are held together by the electric attraction between positive (+) and negative (-) charges. ... When such processes occur in air, they produce there free ions and electrons, which can move and carry an electric current, something neutral atoms cannot do. ... The next heavier atom is that of helium (chemical symbol He) and it contains two electrons. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Armagh Planetarium . ... Moon . ... Space Flight . ... One of the best-known lunar craters, Tycho is not especially large at some 85 km across. ... Bright and with prominent rays of material radiating from it, Tycho is a young crater; there has been little time for the slow and steady rain of micrometeorites to erode it. ... NASAтАЩs LRO recently took this evocative image of the steep slopes of TychoтАЩs central peak illuminated by the morning Sun. ...

... GCN 8471 | ... TITLE: GCN CIRCULAR NUMBER: 8516 SUBJECT: GRB 081102: MASTER refind and final results DATE: 08/11/11 15:50:10 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.Parkhomenko Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalognikh Ural State GCN Circ 8470, Lipunov et al., ...

Comparison of the XPM catalog with the ICRF2 and other catalogs . ... 1 Institute of Astronomy of Kharkiv National University, Kharkiv, Ukraine, . 2 Main Astronomical Observatory of NAS of Ukraine, Kiev, Ukraine, . ... Results of comparison of the XPM catalog with the ICRF2 and other catalogs are presented and discussed. The XPM catalog is a recent realizaтХЫtion of the ICRS in optical and near-infrared wavelengths. ... catalog, ICRF, proper motion, coordinate system. ...

... Solar Eclipses in 2009 : . There are two eclipses of the Sun (an annular eclipse on January 26 and a total eclipse on July 21-22 ) in 2009. ... Annular Solar Eclipse . ... Annular Eclipse of the Sun on January 26, 2009 . ... Beginning of northern limit of umbra . ... Beginning of center line; central eclipse begins . ... Central eclipse at local apparent noon . ... Total solar eclipse . ... An annular eclipse occurs when the apparent disk of the Moon is smaller than that of the Sun. ... Umbra: . ...

Principial publication: Dement'eva A.A. and Ryl'kov V.P. The Fields of Reference Stars for Optical Positional Observations of Astrometric Extragalactic Radio Sources. ... V.9.P.127-138. to the end of the list . The starting page - The catalogues page - The list of the PUL2 fields - The list of the Pul-3(Pul-3SE) fields . Number of field . ... 0116+319 . ... 0153+744 . ... 1993.34 . ... 09 27 03.0138 . ... 73 58 01.550 . ... to the top of the list ...

... A radio galaxy is a galaxy that emits an unusually big amount of energy at radio wavelengths. ... Inside of each galaxy with an active nucleus (radio galaxies are among them) there must be a system of a "central machine" responsible for the colossal amount of the emitted energy from radio to gamma ranges. ... Sometimes a radio source in an active galaxy may flare again if the needed conditions appear (a new portion of matter would fall into the furnace of the "central machine"). ...

Computer Ephemeris for 2014 from DE200/LE200. Longitude of central meridian of Saturn. ...

. Album : asv-album :: Travels to distant places and countries :: 1998/03 Tashkent (Uzbekistan) . Up . << Prev . Tyubeteyka, n . Embroidered skull-cap worn in Central Asia . Next >> . Album created by album from MarginalHacks by David Madison on Tue Jun 23 14:46:31 2015 .

July 19, 1998 . ... An example of the EUV large-scale chain revealed by the modified TRACE EUV images. The TRACE EUV (171 A) image of July 19, 1998 with a number of complicated chains and threads. In particular, an "8"-like structure appear to be present at the central area of the disc restricted by points 1-2-3-4. Some fragments of this structure consist of the two parallel threads. ... Back to the page of the TRACE chains . Back to the parent page . Last update: 9 August 1998 . ...

... M94 or NGc 4736 is an early type spiral galaxy with tightly would spiral structure and a dominant, luminous central bulge. ... This exposure was for 1724 seconds through A1 and B1. ... NGC 7789 is an open stellar cluster in the Galaxy. This exposure is 1351 seconds through B5. ... The Coma Cluster of galaxies was observed for 1850 seconds through the A1 filter. ... NGC 1313 A spiral galaxy in the Fornax Cluster and host of two recent supernova was observed for 1384 seconds through A1 and B5. ...

... Cooperation with third countries and international organizations . ... Scientific and technological cooperation with the Countries of Central Europe (CCE) and the new independent States (NIS) . ... 1 .A SPECIFIC RTD PROGRAMME IN THE FIELD OF COOPERATION WITH THIRD COUNTRIES AND INTERNATIONAL ORGANIZATIONS-INCO 8 . ... From EU Member States and CCE/NIS 28 . From other European countries 28 . ... Contact persons in the EFTA/EEA Member States 43 . Contact persons in other countries 44 . ...