... 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. ...

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Today's APOD | ... Editor's choices for the most educational Astronomy Pictures of the Day about dark nebulae: . APOD: 2006 April 9 - Molecular Cloud Barnard 68 . Explanation: Where did all the stars go? What used to be considered a hole in the sky is now known to astronomers as a dark molecular cloud . ... APOD: 2003 July 13 - The Horsehead Nebula . Explanation: One of the most identifiable nebulae in the sky, the Horsehead Nebula in Orion , is part of a large, dark, molecular cloud . ...

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• APOD: 2008 November 26 - The Horsehead Nebula in Orion
• APOD: 2003 August 18 - Bright Lights, Dark City
• APOD: 2003 May 17 - Dark Sky, Bright Sun

... The Horsehead Nebula in Orion . ... Lemmon SkyCenter , U. Arizona Explanation: One of the most identifiable nebulae in the sky, the Horsehead Nebula in Orion , is part of a large, dark, molecular cloud . Also known as Barnard 33, the unusual shape was first discovered on a photographic plate in the late 1800s. The red glow originates from hydrogen gas predominantly behind the nebula, ionized by the nearby bright star Sigma Orionis . ... Publications with keywords: Horsehead Nebula - Orion . ...

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• Bright Lights, Dark City
• Journal "Peremennye Zvezdy"
• The Horsehead Nebula

... NOTE TO EDITORS: GALAXY FLY-THROUGH AVAILABLE ONLINE . HUGE GALAXY STRING CHALLENGES SPACE THEORY . An enormous string of galaxies 300 million light-years long has been discovered in the remote Universe, challenging existing theories about how the Universe evolved. ... ANU astronomer Dr Paul Francis, who coordinated the international research team, said the galaxy string lay 10,800 million light-years away. ... The research was funded by NASA and the Australian National University. ...

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• C/2006 P1 (McNaught)

Supernova 2009js in NGC 918 . This page is devoted to information on Supernova 2009js in NGC 918 . Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main page . Information on the original web pages for many of these images can be found on the updates and links web pages. Discovered independently by Lick Observatory Supernova Search (USA) and Koichi Itagaki (Japan). ... 2009/10/11.44 . 17.2 . ... Joseph Brimacombe . ...

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• Bright Supernova pages - Statistics for 2015
• Bright Supernova pages - Statistics for 2013
• Bright Supernova pages - Statistics for 2014

In this gallery are many images of Low Surface Brightness Galaxies which have recently been discovered and analyzed. ... The central surface brightness of this galaxy is 24.28 . Malin 2 This galaxy is another huge disk galaxy with a scale length of 15 kpc and a redshift of 15000 km/a. The high surface brightness knot in one of its spiral arms actually has the same color, luminosity and H-alpha equivalent width as the entire Large Magellanic Cloud . ... Truly it is a Low Surface Brightness Galaxy. ...

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Scientists Discover Surface Features on Titan . ... Scientists for the first time have made images of the surface of Saturn 's giant, haze-shrouded moon, Titan. ... Peter H. Smith of the University of Arizona Lunar and Planetary Laboratory and his team took the images with the Hubble Space Telescope during 14 observing runs between Oct. ... About three weeks before Cassini's first flyby of Titan, the spacecraft is to release the European Space Agency's Huygens Probe to parachute to Titan's surface. ...

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• APOD: November 12, 1996 - Comet Hale-Bopp Passes M14
• APOD: August 19, 1999 - Light From The Dark Sun
• APOD: December 6, 1999 - M83: The Southern Pinwheel Galaxy from VLT

... UA SCIENTIST & TEAM DISCOVER SURFACE FEATURES COVER TITAN (Science contacts: Peter H. Smith, (602) 621-2725; Mark Lemmon, (602) 621-1485; UA Lunar and Planetary Laboratory) . Scientists for the first time have made images of the surface of Saturn 's giant, haze-shrouded moon, Titan. ... About three weeks before Cassini's first flyby of Titan, the spacecraft is to release the European Space Agency's Huygens Probe to parachute to Titan's surface. ... Upper left: hemisphere facing Saturn. ...

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• Proteus
• Uranus' Moon Umbriel
• First X-Rays From a Comet Discovered

... It is notoriously difficult to identify weak cosmic ray events in long exposure observations. ... The method is to compare the probability distribution function (PDF) of cosmic ray events between an observation and a dark frame matched in exposure time. We illustrate the basic idea using dark exposures from a Tek 1024 1024 CCD with varying exposure lengths and read-out times. ... Figure: Histogram of cosmic ray events in a two hour dark frame. ... Original PostScript figure (78 kB) . ...

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• Clustering Analysis Algorithms and Their Applications to Digital POSS-II
• Recreating Einstein Level One Processing Exposure Masks and Background Maps in
• NICMOS Software: An Observation Case Study

... This represents the first HI selected sample covering the core and the outskirts of a local cluster of galaxies. ... Optically selected samples miss a considerable number of low luminosity, low surface brightness galaxies underestimating by almost a factor 2 the number of HI rich galaxies present in the cluster volume. ... Right: The g band luminosity function for galaxies in the A1367 volume as obtained from the optically (circles) and HI (histogram) selected sample. ...

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• VIRGOHI 21
• GRB030329

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... A bright nova has recently been discovered in the constellation of Delphinus (The Dolphin). ... The nova was confirmed late on August 14 at a magnitude of 6.3 (in a dark sky the faintest naked-eye stars are approximately 6.0 magnitudes - the lower the magnitude the brighter a star). ... Nova explosions occur in binary systems composed of a star similar to our Sun but only ~1/10 of its mass, and a star called a white dwarf. ...

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• Terry Mosely's Bulletins
• Armagh Astropark: Comets
• Armagh Astropark

... Be Stars . ... Stellar Winds . ... He had found the first emission line star. ... More emission line stars were found soon, and one had to make subclasses to keep some overview. Cas is a main sequence B-type star, and together with other such stars showing hydrogen emission it forms the class of "Be stars", where the "e" stands for emission. ... Struve further speculated that those stars would be surrounded by a disk, basically thrown off the stellar surface by the rapid rotation. ...

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• VISTA view of the newly discovered globular cluster VVV CL001 and its brighter
• Massive galaxies discovered in the early Universe
• The bright star cluster NGC 6520 and the strangely shaped dark cloud Barnard 86

... We present ultraviolet and optical spectra of the bright (V=16.5), high-redshift ( ) QSO HE1122 - 1649 (Reimers et al. 1995a,1995b). ... Keywords: absorption lines . ... The combined data are shown in Figure 1. ... The Ly profile reveals an absorbing subcomponent at in agreement with results from heavy element absorption lines detected in the high resolution optical data. ... Figure: Velocity profiles of heavy element absorption lines arising in the damped Ly system as seen in the optical data. ...

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• HST Spectral Maps of Accretion Disks in Cataclysmic Binaries
• Recipe Editor GPI Data Pipeline 1.0 documentation
• ESA HST 2002 Study

... Bad Astronomy . Misconceptions . ... Bad Astronomy : "That's as remote as the dark side of the Moon!" ... As the tired, hackneyed refrains went on, one in particular caught my ear: " Fly me away to the bright side of the moon, and meet me on the other side." ... As the Moon orbits the Earth, different parts of it get illuminated by the Sun. ... Bad Addendum : At the end of the album "Dark Side of the Moon" by Pink Floyd, there is a voiceover that actually says "There is no dark side of the moon. ...

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... Massive stars, having 10-150 masses of the Sun, with metallicities Z tens to hundreds times less than that of the Sun (Zo), are the main regulators of the galaxy formation and evolution processes in the early Universe. ... In this galaxy, using the 6 m BTA telescope, a new massive blue variable star with high luminosity (>=10 5 Sun's luminocities in visible light) was found. As far as its properties are concerned, this star falls into an LBV (Luminous Blue Variable) class of stars. ...

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• Detection of unique bright radio flare of X-ray binary
• New LBV Star Discovered in the Galaxy
• New LBV Stars in the Andromeda Galaxy

... We present the first edition of the Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog consists of the 3814 objects (3000 discovered by the SDSS) in the initial SDSS public data release that have at least one emission line with a full width at half-maximum larger than 1000 km s-1, luminosities brighter than Mi*=-23, and highly reliable redshifts. ... Based on observations obtained with the Sloan Digital Sky Survey, which is owned and operated by the Astrophysical Research Consortium. ...

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• Conclusions

Astronotes Armagh Planetarium's Stellar Blog! ... Diagrams showing the familiar inner Solar System, outer planets and Kuiper Belt (plus Pluto), Sedna?s orbit and the beginning of the Oort Cloud (Image credit: NASA) . ... At its closest to the Sun, Sedna is about 76 AU from our star, at furthest some 937 AU.€а Sedna and VP113 are believed to be escapees from the Oort Cloud. ... Almost certainly, in the years to come astronomers will find more large worlds between the Kuiper Belt and Oort Cloud. ...

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• Neptune: discovered one year ago | Astronotes
• Wonders of the February Night Sky | Astronotes
• Comet ISON: will it be Comet of the Century? | Astronotes

... Master . ... About Space Monitoring Laboratory, scientific directions, instruments, contacts . ... 20.06.2012 . ... 27 Apr 2012: GRB 120427A: MASTER follow up observations GCN13274 . ... 29 Mar 2012: MASTER OT 123412-632503 detection during Swift trigger 518853 ATel4007 . 26 Mar 2012: GRB 120323A: MASTER follow up observations GCN13116 . ... 29 Jan 2012: GRB 120129A: MASTER optical observations GCN12907 . 06 Jan 2012: GRB 120106A: MASTER Early OT marginally detection GCN12818, GCN12811 . ...

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. A text editor is a program for inserting or amending text in a file. A text editor is not a word processor although some text editors do include word processing facilities.

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• Using the vi editor
• Setting the visual editor variable
• Preparing your mail using an editor

... Tonight's Sky . ... Supernova showered Earth with radioactive debris . ... Ice giants on display in early autumn . Neptune and Uranus reach their 2013 peaks within six weeks of each other on August 26 and October 3, respectively. ... Uranus has a ring system turns edge-on to Earth every 42 years due to the distant planet s changing seasons. ... Scientists think a huge collision early in Uranus history knocked the planet on its side; its rotation axis is now nearly parallel to its orbit. ...

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• April dark skies promise a bevy of "shooting stars" | Astronomy.com
• Editors of Astronomy magazine | Astronomy.com
• A newly discovered comet glows in the morning sky | Astronomy.com