Saturday10 January 20045:38pm MST2004-01-11 UTC 0038 back top next  

The tail of C/2002 V1 (NEAT) covered so much sky a year ago, early on the night of 29 January 2003 in England, that it took four sets of exposures at Great Shefford Observatory to capture it.


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Today's issue status: done
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C/2002 V1 (NEAT)
seen via SOHO 18 Feb. 2003

Cover: See Peter Birtwhistle's C/2002 V1 (NEAT) page about this C/2002 V1 (NEAT) [link|alt] image composite. As viewed via SOHO (right), C/2002 V1 appeared to attract the Sun's quizzical attention the following month, on February 18th (see A/CC's report and animation).

News briefs – part 1/1 Major News for 10 Jan. 2004 back top next  
News briefs

DOU browsing:  Thursday's Daily Orbit Update MPEC (DOU) reports radar observation of PHO 1998 UT18 November 23rd by Arecibo. Yesterday's DOU shows that NEO 2003 YO1, which was discovered with the Spacewatch 0.9m telescope on December 18th (MPEC 2003-Y25), has been been found in image data from the same telescope from 13 January 1994, as well as from LINEAR on the 21st of the month before discovery.

Today's DOU reports that NEO 2002 XA40 has been found in observations from 22 October 1995 from Piszkesteto Station in Hungary, which nicely supplements the 15 October 1995 observations from Mt. Palomar that were found last February. XA40 was discovered by NEAT with the same Mt. Palomar telescope on 11 December 2002 (MPEC 2002-X72) and is estimated to be roughly 1.2 km. (0.74 mile) wide.

Reading:  Tumbling Stone today posted "A special issue of Tumbling Stone dedicated to a special tumbling stone," 69230 Hermes (1937 UB).

Infrasound:  Science News has a long piece today on "Infrasonic Symphony: The greatest sounds never heard," telling about the growing study of infrasound that now also includes aurora detection.

The article has little about large atmospheric meteor events (see A/CC's report), but that subject can be pursued at inframatics.org, hosted at Scripps Institution of Oceanography's Laboratory for Atmospheric Acoustics (L2A). For instance, the June 2003 issue of InfraMatics has brief reports on the 29 December 2000 Tahiti fireballs and 23 April 2001 western Pacific bolide. Much more can be learned about those two events from PDF scientific papers via the references page by searching individually on authors "Reymond" and "ReVelle" for their 2002 papers. There is a treasure of papers here, with 23 on meteor infrasound just from searching on ReVelle.

The March 2003 issue of InfraMatics tells about a proposed open Global INfrasound Archive (GINA) for which the Geological Survey of Canada is hosting a prototype (newer URL).

Risk monitoring - part 1/1 Major News for 10 Jan. 2004 back top next  
Risk monitoring 10 Jan.

Around the time of the full Moon, NEO discovery and follow-up falls off, so it is not unusual that we have nothing to report today. Only one object with impact solutions is currently in view, the low-rated 2003 YG118 listed only by JPL, and no observations have been reported publicly for it today.


Correction:  In the Summary Risk Table (SRT) for yesterday and today, A/CC erroneously indicated that 2003 YS70 had been removed by NEODyS. As correctly reported in yesterday's "Risk monitoring," NEODyS has only moved YS70 from its Risks list of "Objects currently observable" to its list of "Objects too small to be likely to result in damage on the ground." Thanks to Genny Sansaturio at NEODyS for catching and reporting the error. Both risk monitors still have impact solutions for 2003 YS70, but new data isn't likely for quite some time, so A/CC has now dropped it from today's SRT and restored the correct information in yesterday's.

Summary Risk Table - sources checked at 0040 UTC, 11 Jan

Object

Assessment

Years

VI
PS
cum
PS
max
T
S
Arc 
days
 2003 YG118JPL 1/92087-20871-3.32-3.32022.634
NEODyS 12/31R E M O V E D
VI = count of "virtual impactors" (impact solutions)
See A/CC's Consolidated Risk Tables for more and maybe
  newer details, and check the monitors' links for latest info.
Note that only objects recently in view are shown here.
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