... 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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... 2006 March 6 . Unexpected Comet Pojmanski Now Visible . ... Explanation: Have you ever seen a comet? ... Comet Pojmanski , officially designated C/2006 A1 and discovered only in January, now sports a turquoise tail several times longer than the full moon. Comet Pojmanski 's ion tail is due to gas particles expelled by the comet being pushed away from the Sun by the solar wind , the same wind that ionizes gas in the tail causing its blue tint. ... About APOD | ... NASA Official: Jay Norris. ...

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• APOD: 2005 November 20 - Rays from an Unexpected Aurora
• APOD: 2002 August 5 - Rays from an Unexpected Aurora
• APOD: 2008 January 1 - Rays from an Unexpected Aurora

Astronomy Picture of the Day . ... 6.03.2006 . ... Right now, however, a new comet has brightened unexpectedly and is visible as a faint streak to the unaided northern observer in the eastern morning sky just before sunrise. ... Comet Pojmanski , officially designated C/2006 A1 and discovered only in January, now sports a turquoise tail several times longer than the full moon. ... March 2006 . ... Publications with keywords: comet - comet tail . Publications with words: comet - comet tail . ...

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• Астронет > Unexpected Comet Pojmanski Now Visible
• XWare > APOD

... HST . What is the offset in the U2 direction that can be taken before a gap appears? ... HST Peer Review Process . ... HST Overview . Overview . ... Retrieving HST Data . ... HST Science Year in Review . ... What is the offset in the U2 direction that can be taken before a gap appears in the coverage of the sky between the two pointings? ... Same question for a U3 offset. ... This should allow you to accurately address the issue of optimal offsets in the mosaic. ...

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• Initial Hypotheses
• FOC Data Handbook
• SMOV Status Planning Meeting 02/24/97

The annual Geminid meteor shower makes its return to the vicinity of the Earth over the period 7th to 16th December, with the peak of activity expected to occur during the morning of 14th December. ... The Geminids appear to radiate from the constellation Gemini, The Twins, which lies high in the west in the early morning December skies. ... The near-Earth asteroid, Phaeton , discovered in 1983 using a NASA satellite, appears to be the source of the shower. ... Photographing Meteors . ...

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• Armagh Observatory
• Terry Mosely's Bulletins
• Armagh Observatory Geminid Meteors

... Watchouts . ... Help . It has been found by several PN exposures that the event list corresponding to a certain quadrant (3 contiguous CCDs) is truncated. This makes one (or more) quadrant(s) to appear fainter even in exposure corrrected images. ... It has been found that it was present only for some of the SAS versions in the past. SAS 6.5 is definitively affected. ... It follows a complete list of the affected exposures up to revolution 1051: . ... Pages maintained by SAS librarian . ...

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• Comments
• Kill a task

18oct05 When 100 Mhz 3 level data centered at 1384 Mhz is taken (a2010), radar birdies appear in the band. ... The birdie at 1350 Mhz is the Faa radar. ... The table below shows where the 1350 Mhz birdies sits in the 1st IF and at baseband. It also includes the location of the baseband 2nd and 3rd harmonics of the 1350 Mhz birdie. ... When the center frequency is 1380 Mhz, both the 2nd and 3rd harmonics at baseband alias down to 1390 Mhz. ... The 1380 radar birdie comes from the 1350 Mhz birdie. ...

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• ABPP GUI notes
• hp1 synth loses lowest digits

Advances in Wideband SETI and Implications for Radio Telescope Design Dr Ian S. Morrison 24 October 2011 Resurgence in SETI New generation radio telescopes and anticipation of the SKA Emergence of ` wideband SETI ' Successes in astrobiology, in particular exo-planet discoveries 2 1235 Kepler Worlds 68 288 662 184 54 are `habitable' Copyright © Jill Tarter, SETI Institute SETI by Eavesdropping Expect civilisations to have a short timespan for high power ...

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• VLBI Wiki | PmWiki / Troubleshooting
• The Joint Approach
• ATNF Daily Astronomy Picture

NIFS was reassembled for its first mechanisms test in May 2002. ... The cryostat temperatures took 90 hours to stabilize to 50 K. Initial impressions were that all mechanisms were operating correctly. ... Once cold, the mechanisms were extensively tested using command scripts. ... Cold work surface plate being inserted in the NIFS cryostat. ... Bob Miles working on the cryostat center section. ... Spectrograph side of cryostat. ... Instrumentation Links * Gemini Project Links * Other IR Instruments ...

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• C/2006 P1 (McNaught)
• Siding Spring Survey Follow-up Obs
• Observational Techniques Home Page

REPORT ON THE PIERRE DELIGNE FELLOWSHIP, 2011 SERGEY OBLEZIN During 2011 I have been working on developing a representation theory approach to mirror symmetry and quantum cohomology of homogeneous spaces, associated with Lie groups of classical type. According to Givental the glN -Whittaker functions, being solutions to the quantum cohomology D-module QH (FlN ) of the complete flag variety FlN = GLN (C)/B , describe the corresponding equivariant Gromov-Witten invariants of FlN . ...

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• Noeuds et tresses: expected results
• Vladimir Ig. Arnold (12.06.1937-03.06.2010)

Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 20 - 26.08.2012, Forecast on 27.08 - 03.09.2012, Carrington Rotation 2127 (15,04.08.2012) SUNSPOT ACTIVITY OF THE SUN REMAINED AT THE AVERAGE LEVEL. ... ON THE VISIBLE SOLAR DISK CONSTANTLY THERE WERE 4-5 SUNSPOT GROUPS ONE OF WHICH, APPEARING ON THE VISIBLE SOLAR DISK ON AUGUST 25, AVERAGE SIZES. NEXT WEEK THE LEVEL OF SUNSPOT ACTIVITY IS EXPECTED TO BE AVERAGE. ... FLARE ACTIVITY WAS ON THE LOW LEVEL IN ALL DAYS. ...

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• http://www.izmiran.rssi.ru/services/saf/archive/en/2012/obzor20120730.en.txt
• http://www.izmiran.rssi.ru/services/saf/archive/en/2012/obzor20120709.en.txt
• http://www.izmiran.rssi.ru/services/saf/archive/en/2015/obzor20150810.en.txt

... 2000 March 12 . Supernova 1994D and the Unexpected Universe . Credit: High-Z Supernova Search Team , HST , NASA . Explanation: Far away, long ago, a star exploded. ... Supernova 1994D was not of interest for how different it was, but rather for how