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Tuesday2 December 20036:14pm MST2003-12-03 UTC 0114
Today's news about Asteroids, Comets & Meteors
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News briefs

Stardust:  We are one month away from Stardust's January 2nd high-speed flyby of comet 81P/Wild 2 [link|alt], and JPL issued a news release late yesterday, "NASA Spacecraft Pinpoints Where the Wild Thing is." It reports that the comet was "detected on November 13 by the spacecraft’s optical navigation camera on the very first attempt" (image), which was noticed when downloaded the next day. "We were not expecting to observe the comet for at least another two weeks." The observation was quickly repeated, and the data will be used for Stardust's first "approach trajectory correction maneuver," planned for tomorrow, aiming for a flyby distance of "300 kilometers, give or take about 16 kilometers."

Radar news:  Today's Daily Orbit Update MPEC carries radar observations of 1990 OS from Goldstone on November 12th, and 1998 UT18 from Arecibo on November 23rd.

Comet news:  Thanks to A/CC readers who forwarded the link to Nakano Note 995 which today correllated P/2001 RG100 (LINEAR) with C/1979 O1 (Kowal). Known at the time by old-style designation 1979h, it was discovered on 24 July 1979 and also observed on the 25th and 27th by Charles Kowal, and was announced in IAUC 3395 of August 27th. IAUC 3397 two days later clarified that it had been discovered with the Mt. Palomar 1.2m Schmidt telescope. That circular and IAUC 3404 provided ephemerides based on a parabolic and elliptical orbit solutions, but no further observations were reported. 2003 RG100 was only redesignated as a comet on November 28 (see an A/CC report).

Update MPECs were issued today for eight comets in recent view, followed by MPEC 2003-X17 announcing that LINEAR discovery 2003 UY275 has been found to be an active comet. It is long-past a distant 3.729-AU perihelion last July 2nd.


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Risk monitoring 2 Dec.

Today's Daily Orbit Update MPEC (DOU) has observations of 2003 WY153 from LINEAR from yesterday morning and today NEODyS removed this object from its Risk page, while JPL very slightly lowered its low risk assessement with just one impact solution. Today the European Spaceguard Central Node posted an observing campaign for this object, saying that "observations are needed as soon as possible" before the bright Moon to help "relatively large" telescopes find it during "the next dark run."

The DOU carries observations of 2003 WT153 from Linz Observatory from last night in Austria. Today JPL added impact solutions and slightly increased its overall low risk assessment for this small object. NEODyS also increased its count of impact solutions for 2003 WT153, but lowered its overall risk assessment.

Summary Risk Table - sources checked at 0022 UTC, 3 Dec

Object

Assessment

Years

VI
PS
cum
PS
max
T
S
Arc 
days
 2003 WY153NEODyS 12/2R E M O V E D
JPL 12/22071-20711-7.59-7.5901.116
 2003 WW26 NEODyS 12/12061-20725-3.91-4.1708.925
JPL 12/12061-20613-3.90-4.1508.925
 2003 WT153 NEODyS 12/22049-207718-7.16-7.7102.501
JPL 12/22048-210331-6.99-7.7502.501
 2003 WGNEODyS 11/29R E M O V E D
JPL 11/292055-20551-5.95-5.95010.779
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.

Not in the DOU are the two other objects currently in view that have impact solutions.


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