Contents  on 11 August '11


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 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 11 August '11

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty and hasn't been noted by The Tracking News as being active yet today (checked at 2359 UTC). It was last noted active yesterday.

New MPECs  on 11 August '11

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 11 Aug. '11 >>  MPEC 2011-P45 - "06:04 UT" - Daily Orbit Update

Observers  on 11 August '11

Eleven observers appear in today's MPEC.

CodeObserver / observatory
300Bisei Spaceguard Center in Japan, 2 in MPEC 2011-P45 -- 237805, 136770
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2011-P45 -- 2011 PT1, 2011 PF2
B92Chinon Obs. in France, 1 in MPEC 2011-P45 -- 1036
704LINEAR in New Mexico, 3 in MPEC 2011-P45 -- 163081, 3988, 1036
J59Linceo Obs. in Spain, 2 in MPEC 2011-P45 -- 174050, 3288
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-P45 -- 2011 OF26
C27Pallerols Obs. in Spain, 3 in MPEC 2011-P45 -- 2000 CP101, 163760, 3288
F51Pan-STARRS 1 (PS1) in Hawaii, 16 in MPEC 2011-P45 -- 2011 OY17, 2011 OJ5, 2011 OJ10, 2011 MV1, 2008 SQ7, 2008 RJ1, 2004 RW164, 2001 MQ3, 2000 DQ110, 163902, 159399, 159368, 138883, 7341, 3103, 887
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-P45 -- 2011 PT1
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-P45 -- 2011 OR15
D22UWA Obs. in Western Australia, 13 in MPEC 2011-P45 -- 2011 PT1, 2011 PS, 2011 PF2, 2011 OY17, 2011 OV4, 2011 OM5, 2011 OC18, 2008 SR7, 2006 PW, 1999 JR6, 68031, 174050, 169675
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 August '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON risk pages.





Notes for Today's Latest Risk Assessments
2011 OF26JPL Sentry1552R E M O V E DJPL: Risk listing removed at 0952 UTC.
2011 OB26NEODyS22032076-208841.21e-09-9.29-9.430NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2011-07-28.474 to 2011-08-07.110."

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 11 August '11

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

2203Noted that NEODyS has updated its 2011 OB26 risk assessment - see above
1552Noted that JPL Sentry has removed 2011 OF26 as an impact risk - see above
Grabbed MPEC 2011-P45 - Daily Orbit Update - see above