Astronomy Picture of the Day . ... Cataloged as Sharpless 308 it lies some 5,200 light-years away in the constellation Canis Major and covers over 2/3 degree on the sky (compared with 1/2 degree for the Full Moon). Sky Panorama Over Lake Salda . ... The View Near a Black Hole . ... Discovered by accident, this manuscript page provides graphical insight to astronomy in medieval times, before the Renaissance and the influence of Nicolaus Copernicus, Tycho de Brahe, Johannes Kepler, and Galileo. ...

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... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

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Ariel . ... Ariel [AIR-ee-al] is a relatively small satellite and is the brightest moon of Uranus. ... This image of Ariel shows a world pock-marked with craters. ... This image is a mercator map of Ariel. ... This image is a polar stereographic map of the southern hemisphere of Ariel. ... This image is an orthographic view of Ariel centered at -66 degrees latitude and 316 degrees longitude. ... This image of Ariel is at the same geometry of the highest resolution mosaic of Ariel taken by Voyager. ...

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• Hubble Uncovers Dust Disk Around a Massive Black Hole (STScI-PRC98-22) A
• A collection of images
• Educator's Guide to Robotic Spacecraft

Dust in galaxies can be mapped either by the FIR/submillimeter emission, the optical or infrared reddening of starlight, or the extinction of a known background source. ... We find that distant galaxies are predominantly in low-extinction sections marked by the color maps, indicating that their number depends both on the cloud cover of Spitzer-resolved dust structures, mostly the spiral arms, and a diffuse, unresolved underlying disk. ...

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• Dust disk around a black hole in galaxy NGC 7052
• STScI Preprint #1204
• Near Infrared Camera and Multi-Object Spectrometer Instrument Handbook for

Next: SMUDGES Up: Minutes of the 1st Previous: Pilot Survey . ... The Jodrell Virgo survey is part of HIJASS and encompasses 4 X 8 degrees, fully sampled. ... This indicates that we should perhaps survey the outskirts of the cluster to look for low mass clouds. In the survey, objects were detected using a combination of by-eye method and automated routine. 28 detections of well known galaxies . ... Velocity distribution suggests infall or extension along the line of sight. ... Jon . ...

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• The Pleiades
• water ice on mercury

... Telescopes . ... Superb optical performance coupled with time proven computerized pointing and tracking has made the LX200 ACF series a best-seller in the high-performance telescope class. ... Meade's revolutionary LS LightSwitchтДв series of telescopes use advanced technologies to do what no other consumer telescopes have done before: take all the hassle out of using a telescope. ... LX - Rear Thread Aluminum Dust Cover . ... Rear Thread Aluminum Dust Cover for SC and ACF optical tubes. ...

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• LX - Rear Thread Aluminum Dust Cover - Parts - Products
• Products
• Parts - Products

The Sun's corona . ... For instance, short "plumes" rising from the polar regions of the Sun look very much like field lines coming out of the end of a bar magnet, and they therefore suggest that the Sun, in addition to the intense fields of sunspots, also has a global magnetic field like the Earth's. Arches above the . Sun's surface . ... It is brightest near sunspots, whose arched field lines apparently hamper the outflow of solar wind which carries away energy and helps cool the corona. ...

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• Jupiter's Moon Ganymede
• Pluto and Charon
• The Path of the Sun, the Ecliptic

Check out the new images (Jan 18-25) and (Jan 26-Feb 05) of the comet by Rob McNaught. ... Every few years a comet becomes bright enough to be easily seen with the naked eye but only every decade or so are these comparable with comets like Halley. ... Before Jan 13, the comet is not visible in the Australian sky after sunset. ... SOHO images . ... On Jan 12 at approximately 09:00 UT (8pm NSW time), comet C/2006 P1 McNaught appears at the 11 o'clock position in the images. ... STEREO images . ...

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• Blue Straggler Stars
• Spectroscopy

... 2003 March 17 . SN 1006: History's Brightest Supernova . ... Explanation: Suddenly, in the year 1006 AD, a new star appeared in the sky. ... Modern observations have been used to measure the speed of the still-expanding shock wave , allowing a better estimate of its distance and hence a better estimate of the true brightness of the supernova . It turns out SN 1006 likely achieved an apparent visual magnitude of -7.5, making it the brightest supernova on record. ... About APOD | ...

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• APOD: 2002 October 11 - Fomalhaut Dust Disk Indicates Planets
• APOD: January 13, 1997 - Sunspots: Magnetic Depressions
• APOD: March 22, 1998 - Sunspots: Magnetic Depressions

... Like the night sky on the Earth, the martian sky hosts a plethora of astronomical phenomena occurring around the clock in a neverending space opera played out for the benefit of robotic and future human observers alike. ... Moons . Mars has two moons, Phobos and Deimos . ... Under the same conditions, Deimos would be as bright as -5, somewhat brighter than the planet Venus appears in Earth's sky. ... The moons are also eclipsed by Mars itself (a situation analogous to lunar eclipses at the Earth). ...

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• Armagh Observatory
• Terry Mosely's Bulletins
• Flare Dynamics

You Can Make Stellar Images Brighter . Articles | ... A few months ago I wrote an article titled "You Can’t Make Them Brighter". So why am I now writing that you can make them brighter. ... The image of a focused star is actually a small disk called the Airy disk, named after the 19 th century scientist Sir George Airy. ... For a given aperture, a smaller Airy disk means that the light is focused to a smaller disk and is therefore brighter. ... www.astronomy.net . About Astronomy Net | ...

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• Custom Telescope Covers - an Astronomy Net Domes Forum Message

... On the morning of Thursday, 26 February, amid the Gal pagos Islands, the Sun will fade from view. Not the culmination of ancient prophecy, but none less mystical, Earth's small Moon will be executing a slow slide past the enormous Sun. ... And anyone living in southern North America, Central America, northern South America, or on islands and cruise ships in the Caribbean Sea will, weather permitting, have the opportunity to experience the wonder of a solar eclipse. ...

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• ASP: Star Science in the Autumn Sky
• ASP: Accidental Astrophysics: The Devil's In the Magnitudes, Part II
• ASP: Up, Up, and Away

... The State that has the highest rate of usage of ethanol as an alternative fuel . ... The last time the Oregon Ducks beat UCLA in basketball . The participants and score of the 1980 Rose Bowl . ... An Image of Issac Newton . ... The second highest paid player in the NBA last season . ... A map of the dams that comprise the British Columbia Hydropower System . ... The current freeway traffic flow in Seattle Washington . An image of a 1966 Shelby (Mustang) . ... Dr DarkMatter's Home Page . ...

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• Astronomy HyperText Book: Interstellar Medium
• Low Surface Brightness Galaxy Gallery
• Our Place in the Cosmos

... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Observing . ... Why do the constellations and the Moon appear upside down from the Southern Hemisphere? ... From the Southern Hemisphere, any object or constellation that lies near the celestial equator (the imaginary line that divides the northern and southern halves of the sky) would appear both upside down and reversed left to right compared to a northern perspective. ... Get instant access to subscriber content on Astronomy...

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• How were the constellation boundaries set? They appear pretty arbitrary. |
• Partner galaxies wildly different in new WISE image | Astronomy.com
• Europa's ocean sits under a thick ice shell. If this ocean covers the moon's

An introduction to the celestial sphere, describing its . apparent rotation and the special role of the pole star. ... This lesson plan supplements the web page listed below. Originally named "The sky above us" , it was split into two parts, each of which now has a lesson plan. ... Celestial sphere, constellation, zodiac, celestial pole, the Pole Star ("Polaris"), celestial equator, rotation of the Earth, planets [theodolite, equatorial axis]. ... What makes the Pole Star special? ...

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• The Sun's Corona
• Parallax
• May Earth be Revolving around the Sun?--lesson plan #16

Microsymposium 38, MS082, 2003 (A4 format) EVALUATING THE STRUCTURE OF THE SURFACE LAYER OF MERCURY. ... Photometric Analysis of the Lunar Surface Analogue. ... The phase function obtained directly on some segments of the lunar surface: 1- phase function of the Moon, 2 - phase function of Mercury, 3 - phase function of segments, converted to the lunar phase function system (correlation 0.8), 4 - phase function of segments, converted to the Mercurian phase function (correlation 0.9). ...

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• http://selena.sai.msu.ru/Greg/Publications/ms42/m42_50.pdf

... Posts tagged ?Cover? ... Once, perhaps more, I mentioned this book in my post with the most celebrated paper by Shannon (see the posting ). ... Like many fields, Information theory has grown fast since the monumental debut paper by Shannon (1948) like the speed of astronomers observation techniques. ... Book] Elements of Information Theory? Tags: bandwidth , book , Cover , data mining , education , Entropy , Information theory , Kolmogorov complexity , Shannon , Thomas . ... Comment . ...

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• Comments on: [ArXiv] 3rd week, Feb. 2008 By: hlee By: vlk By: Simon Vaughan
• The Threads of Inquiry
• Spectroscopic Data

Next: Installing Up: General information Previous: About this guide Contents . In order to facilitate reading this manual, various fonts are used. Responses you are asked to type in at the command level appear in these fonts: hds_open, filename . ... Procedure names in the text appear like this: average , whereas widget buttons are typed like this: OPEN or D ISP C ORR , depending on whether or not they bring up a new widget or take immediate action, respectively. ...

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• introduction
• Richest Planetary System Discovered | ESO
• CCD artifacts

Next: Catalog Construction Up: Observations and Analysis Previous: Source Detections . ... It was assumed that the highest signal gives the most likely position of the source. ... Comparing the summed map with the maps from the individual energy ranges, the one which produced the smallest error box was chosen to represent the source position, as long as was greater than 4, a level chosen to reflect a reasonable degree of confidence in the detection. ...

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• Using the sky model
• A deep 38-MHz radio survey
• Westerbork Northern Sky Survey

... Stars . ... Straight away the three stars in his belt will grab your attention, followed by the glittering white star Rigel in his left foot and the bright orangish star Betelgeuse in his right shoulder (assuming Orion is standing facing us and not with his back to us). ... Orion Belt?s with the stars Alnitak, Alnilam and Mintaka. ... In short, Orion was a big, loud giant of a man and indeed a mighty hunter, he also inherited some aquatic superpowers from his father who was the sea god Neptune. ...

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