Contents  on 5 January '08


The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days this year through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

NEOCP Activity  on 5 January '08

The MPC's NEO Confirmation Page has 1 listing: 1 new

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new listing. This was a "one nighter." So far The Tracking News has counted a total of two objects listed on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.

New MPECs  on 5 January '08

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been two MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-A25 - "15:20 UT" - 2007 YZ58

<< DOU on 5 Jan. '08 >>  MPEC 2008-A24 - "07:07 UT" - Daily Orbit Update

Observers  on 5 January '08

Twelve observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 25 in MPECs 2008-A24 & 2008-A25 -- 2008 AD, 2007 YZ58, 2007 YV56, 2007 YT56, 2007 YR56, 2007 YO56, 2007 YM56, 2007 XV23, 2007 XP3, 2007 XN3, 2007 XF25, 2007 XA23, 2007 WW4, 2007 WB5, 2007 VX137, 2007 VD3, 2007 UR, 2007 TC23, 2007 RD20, 2007 NS4, 2007 NL1, 2005 EC224, 2004 HK33, 2003 NW1, 2003 CN17
300Bisei Spaceguard Center in Japan, 1 in MPEC 2008-A24 -- 1998 YM4
B55Comeglians Obs., 2 in MPEC 2008-A24 -- 2008 AE, 2007 YV56
J95Great Shefford Obs. in England, 1 in MPEC 2008-A25 -- 2007 YZ58
355Hadano Obs. in Japan, 3 in MPEC 2008-A24 -- 2007 YZ, 2007 VQ4, 1998 YM4
J39Ingenio Obs. in the Canary Islands, 1 in MPEC 2008-A24 -- 2005 WJ56
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2008-A24 -- 2007 VK184
711McDonald Obs. in Texas, 8 in MPEC 2008-A24 -- 2008 AE, 2008 AD, 2007 YV56, 2007 YQ56, 2007 YF1, 2007 YB2, 2007 XK11, 2007 XJ20
474Mt. John Obs. in New Zealand, 2 in MPEC 2008-A24 -- 2007 YS56, 2007 EL88
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2008-A25 -- 2007 YZ58
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 14 in MPEC 2008-A24 -- 2008 AE, 2007 YZ, 2007 YV56, 2007 WF55, 2007 VQ4, 2007 SP6, 2005 XK8, 2005 XD1, 2005 TU45, 1993 TQ2, 170891, 153591, 138947, 137052
D29Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2008-A24 -- 1862

Impact Risk Monitoring  on 5 January '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2354 UTC)
See the CRT page for a list of all objects rated recently as risks.
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.





Notes for Today's Latest Risk Assessments
2007 YV56JPL Sentry1555210311.1e-09-7.09-7.090JPL: "Analysis based on 59 observations spanning 3.9211 days (2007-Dec-31.5148 to 2008-Jan-04.43595)." Diameter approximately 0.210 km. from mean, weighted H=21.0.
2007 YS56JPL Sentry1555R E M O V E DJPL: Risk listing removed at 1129 UTC.
2007 YQ56NEODyS15562027-2089466.88e-07-3.57-3.990NEODyS: "Based on 45 optical observations (of which 0 are rejected as outliers) from 2007/12/31.146 to 2008/01/05.111."
JPL Sentry15552027-2107356.3e-07-3.64-4.050JPL: "Analysis based on 45 observations spanning 4.9644 days (2007-Dec-31.14551 to 2008-Jan-05.10991)." Diameter approximately 0.360 km. from mean, weighted H=19.9.
2007 YM56JPL Sentry1555R E M O V E DJPL: Risk listing removed at 1432 UTC.
2007 YB2JPL Sentry1555R E M O V E DJPL: Risk listing removed at 1241 UTC.
2007 VK184JPL Sentry16272048-205743.8e-04-1.77-1.781JPL: "Analysis based on 99 observations spanning 52.970 days (2007-Nov-12.13904 to 2008-Jan-04.10934)." Diameter approximately 0.130 km. from mean, weighted H=22.0.
NEODyS15562048-206153.81e-04-1.77-1.781NEODyS: "Based on 100 optical observations (of which 1 are rejected as outliers) from 2007/11/12.140 to 2008/01/04.110. NOTE: The Virtual Impactor in 2048/06/03.088 in the table above is rated as Torino Scale 1."

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology  on 5 January '08

Times are UTC for when items were noted or added by The Tracking News.

2354The NEOCP has become active
1627Noted that JPL Sentry has updated its 2007 VK184 risk assessment - see above
1556Noted that NEODyS has updated its 2007 VK184 risk assessment - see above
Noted that NEODyS has updated its 2007 YQ56 risk assessment - see above
1555Noted that JPL Sentry has removed 2007 YB2 as an impact risk - see above
Noted that NEODyS has removed 2007 YB2 as an impact risk - see above
Noted that JPL Sentry has removed 2007 YM56 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 YQ56 risk assessment - see above
Noted that JPL Sentry has removed 2007 YS56 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 YV56 risk assessment - see above
Grabbed MPEC 2008-A24 - Daily Orbit Update - see above
Grabbed MPEC 2008-A25 - 2007 YZ58 - see above
The NEOCP has become empty