M1 image More About M1 Nice Color Picture . ... M16 image More About M16 HST image . ... M31 image More About M31 Nice Color Picture . ... M42 image ; M43 image More About M42/43 Nice Color CCD Picture . M51 image More About M51 Color Image of M51 M51 Supernova . M57 image More About M57 Nice Color CCD Picture Very Deep M57 Image . ... M81 image More About M81 M81 Supernova Ultraviolet Image of M81 More about Ultraviolet Imaging . M82 image More About M82 M82 False Color M82 True Color . ...

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• Low Surface Brightness Galaxy Gallery

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Risks Comparable to NEOs . ... The Increasing Rate of Discovery of Asteroids . ... Comet and Asteroid Collision Probabilities . ... Extreme albedo comets and the impact hazard (PDF Format) . ... Asteroid Impact Animations . ... Workshop on Scientific Requirements for Mitigation of Hazardous Comets and Asteroids - 2002 . ... The Spaceguard Survey Report, 1992 (PDF) . Tsunami from Asteroid/Comet Impacts . ...

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• Featured Image | International Year of Astronomy in Ireland | Astronomy 2009

... 2013 July 28 . Hoag's Object: A Strange Ring Galaxy . ... This question came to light in 1950 when astronomer Art Hoag chanced upon this unusual extragalactic object . ... How Hoag's Object formed remains unknown, although similar objects have now been identified and collectively labeled as a form of ring galaxy . ... Hoag's Object spans about 100,000 light years and lies about 600 million light years away toward the constellation of the Snake ( Serpens ). ... About APOD | ...

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• APOD: 2010 August 22 - Hoags Object: A Strange Ring Galaxy
• APOD: 2004 August 15 - Hoags Object: A Strange Ring Galaxy
• APOD: 2002 September 9 - Hoags Object: A Strange Ring Galaxy

... Bright Galaxy NGC 2903 . ... This impressively sharp color image shows off the galaxy's beautiful blue spiral arms. Night Shining Clouds . ... Alluring noctilucent or night-shining clouds lie near the edge of space, some 80 kilometers above Earth's surface. ... Red, White, and Blue Sky . ... Also visible in the above image of the Martian North Polar Cap are red areas of rock and sand, white areas of ice, and dark areas of unknown composition but hypothesized to be volcanic ash. ... Neon Saturn . ...

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... 50 Weirdest Objects . ... Get to Know the Night Sky . ... Picture of the Day . ... Observing springtime deep-sky objects with a large telescope . ... How can the Hubble Space Telescope (HST) take pictures of objects light-years away but not get a good picture of Pluto? ... At its distance, it subtends a smaller angle on the sky than does a galaxy at a distance of billions of light-years. Get instant access to subscriber content on Astronomy.com! ... Get full access to StarDome PLUS . ...

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• Bright galaxies | Astronomy.com
• What is the baseline for determining the magnitude scale of celestial objects?
• What effect, if any, do the objects in the Kuiper Belt and Oort Cloud have on

EMBARGOED UNTIL 3:30 p.m. MST, January 11, 1995 HUBBLE CAPTURES MERGER BETWEEN QUASAR AND GALAXY This NASA Hubble Space Telescope image shows evidence fo r a merger between a quasar and a companion galaxy. ... The bright central object is the quasar itself, located several billion light-years away. The two wisps on the (left) of the bright central object are remnants of a bright galaxy that have been disrupted by the mutual gravitational attraction between the quasar and the companion galaxy. ...

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• http://www.arcetri.astro.it/~palla/ANDREAIMMAGINI/Galassie/QSO100000.txt
• APOD: August 7, 1998 - M65 Without Moth
• Dust in Spiral Galaxies

... Courtesy of NASA/ESA Observation data (J2000 epoch) Constellation Right ascension Declination Redshift Distance Type Serpens Caput 15h 17m 14.4s[] +21° 35 08[] 12,740±50 km/s[][1] 600±30 Mly (183±8 Mpc)[1] SA0(r) [citation needed ] [a] Apparent dimensions (V) 0.28 в 0.28[] Apparent magnitude (V) 16.0[] Notable features Ring galaxy Other designations PGC 54559,[] PRC D-51[] See also: Galaxy, List of galaxies Hoag's Object is a non-typical galaxy of the type known as a ring galaxy. ...

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... HST Phase II Proposal Instructions for Cycle 20 > Chapter 3: Fixed and Generic Targets > 3.3 Target Category and Target Description [Description] . ... Each target must be assigned a single primary category from Table 3.2 , and at least one descriptive keyword , chosen from the appropriate Table 3.3 through Table 3.9 (see Table 3.2 for which table is appropriate for each category). ... Table 3.3: Descriptive Keywords for STAR and EXT-STAR . ... Table 3.6: Descriptive Keywords for CLUSTER OF GALAXIES...

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• Superluminal Motion in the M87 Jet
• Studying Proto-Planetary Nebulae
• Stellar/Galaxy Objects

Astronotes Armagh Planetarium's Stellar Blog! ... Moon . Planets . ... Monthly Sky Notes . ... February . ... The ringed planet will be quite bright, but unlike Jupiter it will not be the brightest point of light in the sky, this accolade will return to Sirius which is the brightest star in our night sky in the constellation of Canis Major. ... Seven days later on February 18, the Moon will be in its full Moon phase. ... Tweets that mention Wonders of the February Night Sky | ... Astronotes . ...

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• Other Galaxies | Astronotes
• The Mystery Object of M82 | Astronotes
• Orion, mighty hunter of the winter sky | Astronotes

... 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"). ...

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• Galaxy sector, archive 2004
• Galaxy sector, archive 1994
• Detection of unique bright radio flare of X-ray binary

... Are HVCs a common feature of star forming galaxies? ... Consider the typical properties of the smallest HVCs (compact HVCs) found in HIPASS: . Distance . HI Mass . ... At 5 kpc . meager objects ~116 solar masses . ... 1.15 x 10 4 solar masses . ... Putman et al. (2003) found none to 10 7 solar masses. 2% of Sculptor to 3 x 10 6 solar masses by de Blok et al. (2001) found none. ... High velocity gas around other galaxies can be identified from maps and dynamics: . ... 2003) . ...

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• I-GALFA Reveals Dynamic Events in Our Galaxy
• The Large Magellanic Cloud
• HISA Poster for the 195th Meeting of the AAS, January, 2000

... 2000 . ... Abstract: I present the distribution of the brightest galaxies in the southern sky as obtained from the H I Parkes All-Sky Survey (HIPASS). ... A histogram of the systemic velocities of the brightest HIPASS galaxies is shown in Fig. ... It peaks, as expected, in the interval 800 to 2000 km/s. No bright galaxies were found with systemic velocities of less than -350 or more than 5500 km/s. Figure 2: Histogram of the H I systemic velocities of the brightest galaxies obtained from HIPASS. ...

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• ATNF Daily Astronomy Picture
• Peculiar Gas Dynamics in the Starburst Galaxy NGC 253
• The HIPASS Bright Galaxy Catalog

... To separate stellar spectra from other non emission-line spectra we use a template with the most common stellar features which is cross-correlated with the observed spectra. ... The remaining stellar spectra are roughly classified as A - G stars, most of them having intermediate types between A and F, or F and G. The coordinates, apparent magnitudes, spectral types and lists of absorption features identified in the spectra of these objects are given in Table 5. root . 1998-11-24 ...

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• Non-classified objects
• Results and conclusions
• Emission-line galaxies

... In one situation, we can use light from quasars to probe the material between us and them because that light may pass through one or more galaxies or gas clouds on its way to us. The gas inside the galaxies or the intergalactic clouds acts then as a filter, absorbing selected wavelengths from the quasar light. ... Light from a quasar must pass through clouds of gas and even faint galaxies -- each leaving its imprint on the light -- before we receive it here on Earth. ... Gravitational lensing . ...

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• ASP: SETI?s Prospects Are Bright
• ASP: Book Review
• ASP: An Ancient Universe - The Age of Light from the Most Distant Galaxies

... Low resolution, slitless spectral images were obtained at the Loiano Observatory in the wavelength window 3300-6420 ?, in order to identify in extragalactic objects targets displaying the most prominent features that characterise the spectrum of bright hot stars, WR and Luminous Blue Variables (LBV), and of nebular regions as well. We present the results with the well studied galaxy M 101, where the previously known H II regions with WR star signatures are easily identified. ...

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• Classification of Objects in the Guide Star Catalog
• Object Detection Using Multi-Resolution Analysis
• Grid OCL : A Graphical Object Connecting Language

... The search for distant objects which can be both galaxies and quasars is one of the most important problems of observational astrphysics, because it allows one to determine cosmological parameters connected with the time of appearence and evolution of stellar systems, large scale structure of the Universe. ... Radio galaxies are important objects to be studied because they are sources of infrared-optical-ultraviolet continuum, emission lines and continual radio emission. ...

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• Laboratory of spectroscopy and photometry of extragalactic objects : Vortex1
• Laboratory of spectroscopy and photometry of extragalactic objects : Vortex
• Laboratory of spectroscopy and photometry of extragalactic objects : Devices

... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... ESO . ... Survey Telescopes . ... ESO Supernova . ... Star Clusters . ... Stars@ESO . ... ESO 3.6-metre telescope . ... MPG/ESO 2.2-metre telescope . ... ESO 1-metre Schmidt telescope . ... Future Projects . ... This NASA/ESA Hubble Space Telescope image shows the positions of the past, present and predicted future appearances of the Refsdal supernova behind the galaxy cluster€а MACS J1149+2223 . ...

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• Zooming in on a stellar nursery in Corona Australis | ESO
• Bright Supernova in the Large Magellanic Cloud (LMC) | ESO
• Magellanic Clouds тАХ Irregular Dwarf Galaxies | ESO

General Forum Message . Forums: . ... Deep Space Object Galaxy Near M13 . ... Can anyone tell me if there is a DSO (likely a galaxy) near M13? ... The reason it interests me is that I drew a sketch of M13 years and years ago while observing - and that object is one of the handful of 'stars' that I drew. ... www.astronomy.net . About Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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• Summer Triangle - an Astronomy Net Article
• You Can Make Stellar Images Brighter - an Astronomy Net Article

... Archives . ... Aug 14th, 2007| 12:47 pm | ... Without an optical afterglow, a galaxy within the 2 arc second error region of a GRB x-ray afterglow is identified as a host galaxy; however confusion can rise due to the facts that 1. the edge of a galaxy is diffused, 2. multiple sources could exist within 2 arc second error region, 3.the distance between the galaxy and the x-ray afterglow is measured by projection, and 4. lensing causes increase of brightness and position shifts. ... Chandra Blog . ...

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• The galaxy M100
• The AstroStat Slog morphology
• The AstroStat Slog Blog Archive space weather

... Supernova Archive for 2008 . ... Sorted by Name For the year 2008 , 520 supernovae and 36 extragalactic novae were reported. 257 of these supernovae were named by CBAT, 11 were given possible supernova designations, and 252 were not reported to CBAT. 93 supernovae were found in NGC/IC galaxies, 200 were found in named galaxies 130 objects were discovered by amateurs 3 were brighter than 13th Magnitude 45 were brighter than 16th Magnitude 201 were brighter than 18th Magnitude 251 ...

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• Bright Supernova pages - Statistics for 2010
• Bright Supernova pages - Statistics for 2000
• Bright Supernova pages - Statistics for 1999