Sunday25 January 20047:18pm MST2004-01-26 UTC 0218 back top next  

The Asteroid/Comet Connection's
daily news journal about
asteroids, comets, and meteors

Today's issue status: done
  • Risk monitoring – NEODyS has posted 2004 BU58, JPL has posted 2004 BW58, both have removed 2004 BG41 & JPL has re-posted 2003 YG118

Today's cover is an A/CC adaptation (asteroid art background and text added) of a Boeing artist's concept of the proposed modular NASA Crew Exploration Vehicle (CEV) in a deep-space "interplanetary" mission configuration that includes a Crew Control Module similar to the Apollo command capsule and an inflated Crew Habitat. Vehicle graphic courtesy of The Boeing Company, a link first noticed at NASA Watch.

Risk monitoring - part 1/1 Major News for 25 Jan. 2004 back top next  
Risk monitoring 25 Jan.

Today NEODyS posted 2004 BU58, which was announced early this morning in MPEC 2004-B45 as having been discovered by LINEAR Friday morning and followed up that night and Saturday morning by Eschenberg, Modra, and Table Mountain observatories along with KLENOT and LINEAR.

JPL today posted 2004 BW58. It was also discovered Friday morning by LINEAR, and was announced today in MPEC 2004-B47 as confirmed the next morning by KLENOT and this morning by Great Shefford and Pla D'Arguines observatories.

Both 2004 BU58 (H=18.2) and BW58 (H=18.6) are estimated from their MPC brightness calculation (absolute magnitude) to be around roughly 0.7 km. (0.4 mile) in diameter, although JPL puts BW58 at H=19.4, or about 455 meters/yards wide.

The Sunday Daily Orbit Update MPEC (DOU) has observations of 2004 BG41 from Great Shefford last night, and both risk monitors today removed single impact solutions for this tiny object.

The DOU also has observation of 2004 BV1 from this morning from Jornada Observatory, and today NEODyS is down to one very low-rated impact

Summary Risk Table - sources checked at 0216 UTC, 26 Jan




 2004 BW58JPL 1/252013-21028-6.11-6.5901.841
 2004 BV1 NEODyS 1/252038-20381-7.30-7.3009.034
JPL 1/252085-210014-4.43-4.7209.034
 2004 BU58 NEODyS 1/252009-20186-4.57-4.9300.994
 2004 BN41JPL 1/242098-20981-6.64-6.6401.049
 2004 BG41JPL 1/25R E M O V E D
NEODyS 1/25R E M O V E D
 2003 YG118JPL 1/252087-20871-4.02-4.02037.665
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.

solution. JPL slightly lowered its overall BV1 risk assessment. All of its solutions now are beyond the NEODyS 2080 time horizon.

Since JPL removed 2003 YG118 on January 18th, continuing observations have come in from Lumezzane, Guidestar, Begues, and McDonald observatories, along with the Vatican Advanced Technology Telescope (VATT) and LINEAR. Today's DOU has positions reported from late Friday from Rezman Observatory, and now JPL has reposted YG118 with a single 2087 impact solution.
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