. Pulkovo Observatory of Russian Academy of Sciences is situated . near Saint-Petersburg. It was founded in 1839. 196140, Saint-Petersburg, Pulkovskoye chaussee 65/1 . English version . Russian version . This page has been accessed times since May 1, 1999.

... The catalogues of central velocity dispersion and maximum velocity of rotation . HyperLeda home | Documentation | Search by name | ... This catalogue is an updated version of the catalogue distributed as an Appendix to a paper by Prugniel and Simien (1996) . ... It contained 12858 velocity dispersion and 1613 rotation measurements in december 2007, for respectively 7601 and 801 objects and from 418 and 231 references. ... The description of an updated version of this compilation is here . ...

... 22.Reference Frames . ... Inertial Forces . 23a. The Centrifugal Force . ... When calculating the motions of the oceans and the atmosphere, it is much easier to use reference points on the rotating Earth and add a centrifugal force to all equations. ... The rest arises because the Earth is not a perfect sphere: the centrifugal force of its rotation causes its equator to bulge out , making the surface there more distant from the Earth s center and thus weakening the gravitational pull. ...

Optical Filters . The polarizer quads were also designed to map onto a four-faceted WFC configuration and, consequently, also require a partial filter rotation of -33 degrees to move the filter quadrant 1 (nominal polarization angle 135 degrees ) into WFCs 2 and 3, with some vignetting of both camera fields. Several additional partial rotations have been added to allow observations with different polarization angles on the same CCD. ...

... We have mapped the central region of the spiral galaxy NGC 1808 in the 12CO J=1-0, J=2-1, J=3-2 lines and measured 13CO J=1-0, J=2-1, C18O J=1-0, HCN J=1-0 and an upper limit on CS J=2-1 at the central position. ... The line intensity ratios indicate that the central molecular gas of NGC 1808 is in a state of high excitation compared with giant molecular clouds in the disk of the Milky Way. ... A simple estimate of the pressure felt by these clouds leads to further constrains on their properties. ...

Next: Front End Construction Up: Minutes of the 1st Previous: Minutes of the 1st . ... Calculated system temperature: 25-26K at 1525 MHz, 29-30K at 1375 MHz and 34-25K at 1225 MHz. ... Calculated G/T - again, center pixel better . ... Multi Beam Sky Footprint: Separation 2 beam widths between individual beams . ... Calculated Beam Comatic Level about 8 dB . ... German . ... Slide 1.9 shows calculated T sys with 2 points for each frequency; one is for the center beam and other is for the outside. ...

... Jupiter Rotation Movie from Pic du Midi . ... 6.12.2011 . ... Many interesting features of Jupiter's enigmatic atmosphere , including dark bands and light zones, can be followed in detail. A careful inspection will reveal that central clouds rotate slightly faster than clouds toward the poles. ... December 2011 . ... NASA Web Site Statements, Warnings, and Disclaimers . ... Publications with keywords: Jupiter - rotation - clouds . Publications with words: Jupiter - rotation - clouds . ...

This WWW form allows the user to obtain "postage stamp" FITS or jpeg images or contour plots of selected, small fields from the The VLA Low-Frequency Sky Survey (VLSS, formerly VLSS). ... The specified region of the closest VLSS field is returned as a FITS or jpeg format image or a contour plot. ... The VLSS postage stamp server can return a FITS file with the MIME type of image/x-fits; your browser needs to be told a suitable display program for FITS files. ...

As announced by the IAU Central Bureau for Astronomical Telegrams in Circular No. 9004 on 11 December 2008, Bulletin C36 of the International Earth Rotation and Reference Systems Service announced that a positive leap second will be added on 1 January 2009. ... Bulletin C is mailed every six months, either to announce a time step in UTC or to confirm that there will be no time step at the next possible date. Daniel GAMBIS Head Earth Orientation Center of IERS Observatoire de Paris, France ...

... According to the most popular cosmological paradigm, the greater part of the galaxy mass is accumulated in the dark matter halo. ... The polar ring galaxies (PRGs) reveal external rings or disks of gas, dust and stars rotating in a plane roughly perpendicular to the disk of the central galaxy. ... The shape of the dark halo in the model was chosen so as to achieve the best fit to the observed rotation of both galaxies themselves and their polar rings. ... The SPRC-7 galaxy. ...

... Magnetic Storms . ... The Earth's own magnetic field is probably created in the Earth's core, believed to contain molten iron, by a "fluid dynamo" . ... Jupiter . ... The magnetospheres of the giant planets differ from the Earth's in at least four ways. ... If Jupiter's magnetosphere has the same proportions, the solar wind would need 2-3 days to cover the corresponding distance (equal to about half the Earth-Sun distance!), during which the planet might have rotated 5-7 times around its axis. ...

... Matching the Surface of Best Focus . ... The plug-plates of SDSS project are responsible for locating the optical-fiber plugs spatially and for defining the plug tilt with respect to the surface of best focus. ... Approximately 670 holes are drilled in each plate. ... In the first attempts to match the curvature of the plug-plates to that of the best focal surface, the bending fixture was set upon 3 6.630mm metal supports that were affixed to a table top and spaced 120 apart. ...

M1 is also known as the Crab Nebula. It is a remant of a supernova that occured in 1054 AD. The central star is actually a rotating neutron star and is called a pulsar. This exposure was taken through a narrow band H-alpha filter to make the filamentary structure stand out somewhat.

... 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) . ...

We have analyzed dimmings (i.e. transient coronal holes) and manifestations of a . coronal wave in the famous event of 14 July 2000 using images produced with the EUV . telescope SOHO/EIT. ... this event was studied using running -difference EIT images at 195 formed by the . ... Running -difference images . ... fixed -difference images are considered. ... 171, 195, 284, and 304 , as well as the light curves of the main dimmings including . several later images at 195 . To event page ...

The AstroGuide . ... AstroGuide | ... AstroGuide Listing . Login . See many more Astronomy Listings by: Category or Alphabet . The Amateur Astronomers of Central Iowa is a small nonprofit amateur astronomy club located near Marshalltown in Central Iowa. ... Listed Since February 14, 1999 . ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . are trademarks of John Huggins ...

... Home Observing AAA Urban Starfest in Central Park . ... Urban Starfest in Central Park . ... Beyond New York City . ... AAA In the News . ... Join the Amateur Astronomers Association (AAA) of New York at their annual Autumn Urban Starfest on Saturday, October 17, 2015, starting at 7:00 pm at the Sheep Meadow. ... WHO:€а Amateur Astronomers Association (AAA) of New York€а (aaa.org) and the Urban Park Rangers . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by...

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... 2001 March 21 . Barred Spiral Galaxy NGC 2903 . ... HST , ESA , NASA . Explanation: NGC 2903 is a spiral galaxy similar to our own Milky Way Galaxy . ... One striking difference, however, is the appearance of mysterious hot spots in NGC 2903's core. ... Further investigation has indicated that current star formation is most rampant in a 2000 light-year wide circumnuclear ring surrounding NGC 2903's center. ... About APOD | ... NASA Technical Rep.: ... A service of: LHEA at NASA / GSFC . ...

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