Astronomy Picture of the Day . ... The relative average abundance in our Solar System appears higher than can be made in the early universe, in stars, and even in typical supernova explosions. ... Comet Garradd and the Coat Hanger . ... Sweeping through planet Earth's night sky, last weekend Comet Garradd (C/2009 P1) visited this lovely star field along the Milky Way in the constellation Vulpecula. ... Stars born.. M6: The Butterfly Cluster . ... Comet Garradd Passes Ten Thousand Stars . ...

Archive | Index | ... Driving to the Sun . ... The Iron Sun . Painting with Solar Neutrons . The Sun Also Rises . The Sun Flares . The Sun Spews X-rays . The Sun Today . ... This index contains previous Astronomy Pictures of the Day (TM) sorted by subject and is updated monthly. Therefore, only APODs occurring before the beginning of this month are currently indexed. The chronological archive is completely current. ... NASA Technical Rep.: ... Specific rights apply. ...

Подписка на рассылку обзоров astro-ph на Subscribe.Ru . ... Предыдущий выпуск (N335) . ... Обсудить на форуме Scientific.RU . ... Подписка на рассылку обзоров на Subscribe.Ru . Обзоры препринтов astro-ph . ... Собственно обзоры препринтов. ... Ранее обзоры также были на Астронете и на Scientific.Ru . ... АНКи доступны на Астронете , а с 2006 по 2008 г. также на сайте Элементы.Ру . ... Ранее они также размещались на сайте Астронет и в архиве моих обозрений (кодировка KOI8) на сайте Scientific.Ru . ...

... Tonight's Sky . ... Sky this Month . ... Star Atlas . ... stars . ... The Sky This Week: April 1 - 10 . ... Observing springtime deep-sky objects with a large telescope . ... Why do some stars appear to flash a variety of different colors when you look at them through a telescope? ... So, Earthт??s atmosphere will bend some colors from especially bright stars more so than others, which makes the source look like itт??s flashing colors. Get instant access to subscriber content on Astronomy.com! ...

... First briefly outline two important models for pulsar electrodynamics: Vacuum and Magnetospheric models. Two models, two electric fields: inductive and potential. Screening of the induced E and produced co-rotation E by the screening current density. ... These are not the screening current density we needed. ... Force-free condition: Co-rotation E: GJ charge density: Two Electric Fields EI from the Vacuum model is inductive in nature, E from the magnetospheric model is potential and inductive. ...

... At the operating temperature of -88 C, maintained after April 23, 1994, the WFPC2 CCDs have a low dark background, ranging between 0.002 and 0.01 e - /s/pixel. A relatively small number of pixels have dark currents many times the value. ... The combined file is obtained by using the superdark value for all pixels that appear normal in the weekly dark, namely, for which the dark current value in the weekly dark does not differ from the superdark value by more than 3 . ...

... 23 September 2004 - Telescope First Light! ... 30 July 2004 . ... NIC-FPS is an instrument combining the capabilities of a near-infrared imaging camera with a cryogenic Fabry-Perot etalon currently under development at the Center for Space Astrophysics and Space Astronomy , University of Colorado with support from Rice University , Ball Aerospace and the Astrophysical Research Consortium. It is scheduled to begin operations on the ARC 3.5m telescope at Apache Point Observatory in 2004. ...

As noted earlier Kristian Birkeland, reporting in 1903 on his expeditions to the auroral zone, proposed that magnetic disturbances accompanying the aurora were caused by large electric currents flowing down the length of auroral formations. ... Some scientists disagreed with Birkeland and claimed the electrojets did not connect to space but instead their entire circuit lay inside the ionosphere, like that of other ionospheric currents known at the time, believed to be caused by atmospheric tides. ...

... Files in red?history) . ... Auroral Currents . 25H. Birkeland Currents . ... As noted earlier Kristian Birkeland, reporting in 1903 on his expeditions to the auroral zone, proposed that magnetic disturbances accompanying the aurora were caused by large electric currents flowing down the length of auroral formations. ... In later years these currents became known as the auroral electrojets , and considerable debate ranged over their cause and the way their circuit might be completed. ...

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. Other Relevant Links . Number counts have been illustrated earlier in the talk. QSO Clustering and Large-Scale Structure , Scott Croom et al . QSO Evolution and the Luminosity Function , B.J. Boyle et al . | Front page | . | << - Contamination | QSO close pairs - >> | . Robert J. Smith, ">rsmith@mso.anu.edu.au Last modified: Fri Sep 24 11:39:02 EST 1999 .

... They are plotted below by year and for the last 5 and 30 days (updated at 5:25 am each day). ... The black and white plots have a mosaic with 1 plot per receiver (if you don't have a color plotter, then you can make hardcopy with the black and white version). ... All plots are pdf files. ... 13jan03- lbn dewar warmed up for maintenance. xband 16K stage drops by 5K since now 2 rather than 3 dewars on the compressor. 15jan03- lbn op-amp for tempmonitor conversion I to V added bypass capacitors. ...

The left mouse button controls the creation and manipulation of region markers or cursors. ... Text When a marker type of selected, new markers of that type can be created using the left mouse button. The current default marker type is displayed below the menu. ... Set Default Marker Name (and Color) . ... Reset the fix parameter state of currently existing markers to match the global state set by the -fix command switch or by the Edit Global Fix Params For New Markers option in the Markers menu. ...

... The color selection widget is, not surprisingly, a widget for interactive selection of colors. ... Clicking on it opens a color selection dialog, and changing the color in the color selection dialog changes the background color . #include glib.h #include gdk/gdk.h #include gtk/gtk.h GtkWidget *colorseldlg = NULL; GtkWidget * drawingarea = NULL; GdkColor color ; /* Color changed handler */ void color _changed_cb( GtkWidget * widget , GtkColorSelection * ... File...

... Now click on HIDE and all non-PRISM observations should disappear. ... Can be accessed with visTable = oirGetVis(filename, wave=wave) with wave optional visTable.visamp is an array of (nWave) correlated fluxes (Jy) visTable.visphi is an array of (nWave) differential phases (degree) visTable.visamperr contains the estimated rms of visamp visTable.visphierr contains the estimated rms of visphi wave contains nWave values of the wavelength (microns) .photometry Produced by oirChopPhotometry. ...

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... What's New? Bad Astronomy . ... News . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Brains on Vacation Archive . Mary, Mary, Where Ya Goin' To? ... Have you ever looked at the clouds, and seen faces in them? ... We all know it's a coincidence, right? ... Jesus is a favorite, obviously, and has been seen in a giant cosmic cloud of dust and gas (right) and various other out-of-the-way places. ... 2008 Phil Plait. ... Check out my book "Bad Astronomy" . ...

... Next: An IRAF-Independent Interface Up: Software Systems Previous: A New PROS . ... We present a high-level representation of the packages and tasks within IRAF/PROS. ... We have produced a high-level overview of PROS. ... The incremental stages were the short-term goals: a project overview diagram (i.e., an organizational diagram of software modules); high-level diagram (i.e., a bubble diagram of each module in the system); and unifying element tables (i.e., tables of task vs. software attributes)....

EPIC Calibration and Operation Meeting PN Open Points EPIC NCR Status 7th February 20 01 Fabio Giannini ESA-HQ : 7th February 2001 XMM 1 Summary · PN Open Points · EPIC Status ­ MOS ­ p-n ­ RAD MON ESA-HQ : 7th February 2001 XMM 2 PN Open points · OFFSET / NOISE Transmission current ... RAD MON OPEN Non Conformances ­ All closed by desperation ESA-HQ : 7th February 2001 XMM 7 EPIC Status · MOS Major recent problems ­ Bright pixels in MOS 2 (July 2000). ...

Weak Lensing Constraints on Dark Matter Halos Tereasa Brainerd Institute for Astrophysical Research, Boston University, USA It is currently thought that all large galaxies reside within massive dark matter halos. Despite the apparent ubiquity of such halos and their importance for developing a complete picture of the history of galaxy formation, the characteristic parameters (e.g., total mass, physical extent, and shape) of these objects remain largely unconstrained at present. ...