Contents  on 18 January '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 18 January '11

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

When last checked at 2322 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one updated listing. This was a "one nighter." So far The Tracking News has counted a total of three listings on the NEOCP at some point today.

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

New MPECs  on 18 January '11

Minor Planet Electronic Circulars

As of last check at 2322 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2011-B10 - "12:24 UT" - 2011 AC72

<< DOU on 18 Jan. '11 >>  MPEC 2011-B09 - "07:12 UT" - Daily Orbit Update

Observers  on 18 January '11

Six observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2011-B09 -- 2011 AN52, 2011 AM24, 2011 AM1, 2011 AL37, 2011 AL1, 2011 AF37, 2010 YB, 2010 XZ67, 2010 WQ7, 2010 SD13
432Boambee Obs. in New South Wales, 3 in MPEC 2011-B09 -- 2000 AZ93, 248083, 141079
160Castelmartini Obs. in Italy, 8 in MPEC 2011-B09 -- 2010 XP51, 2010 WP8, 2010 NW117, 2010 LR68, 2007 EM88, 2002 BN, 152563, 5496
704LINEAR in New Mexico, 1 in MPEC 2011-B09 -- 3122
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2011-B09 & 2011-B10 -- 2011 AC72, 34613, 152889
I28Starhoo Obs. in Massachusetts, 1 in MPEC 2011-B09 -- 175706
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 January '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2322 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 (backup) risk pages.





Notes for Today's Latest Risk Assessments
2011 AL37JPL Sentry1732R E M O V E DJPL: Risk listing removed at 1053 UTC.
2011 AM24JPL Sentry17322033-2104224.7e-08-5.03-5.060JPL: "Analysis based on 35 observations spanning 5.7668 days (2011-Jan-11.45149 to 2011-Jan-17.21826)." Diameter approximately 0.270 km. from mean, weighted H=20.5.
NEODyS1732R E M O V E D-

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 18 January '11

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

1732Noted that JPL Sentry has removed 2011 AL37 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 AM24 risk assessment - see above
Noted that NEODyS has removed 2011 AM24 as an impact risk - see above
Grabbed MPEC 2011-B09 - Daily Orbit Update - see above
Grabbed MPEC 2011-B10 - 2011 AC72 - see above