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
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| Summary Risk Table - sources checked at 0216 UTC, 26 Jan |
Object |
Assessment |
Years |
VI | PS
cum |
PS
max | T
S | Arc
days |
|
| 2004 BW58 | JPL 1/25 | 2013-2102 | 8 | -6.11 | -6.59 | 0 | 1.841 |
|
| 2004 BV1 | NEODyS 1/25 | 2038-2038 | 1 | -7.30 | -7.30 | 0 | 9.034 |
| JPL 1/25 | 2085-2100 | 14 | -4.43 | -4.72 | 0 | 9.034 |
|
| 2004 BU58 | NEODyS 1/25 | 2009-2018 | 6 | -4.57 | -4.93 | 0 | 0.994 |
|
| 2004 BN41 | JPL 1/24 | 2098-2098 | 1 | -6.64 | -6.64 | 0 | 1.049 |
|
| 2004 BG41 | JPL 1/25 | R E M O V E D |
| NEODyS 1/25 | R E M O V E D |
|
| 2003 YG118 | JPL 1/25 | 2087-2087 | 1 | -4.02 | -4.02 | 0 | 37.665 |
| NEODyS 12/31 | R 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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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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