Contents  on 16 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 16 January '11

The MPC's NEO Confirmation Page has 11 listings: 4 new, 7 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four new and seven updated listings. Of these, nine were "one nighters." So far The Tracking News has counted a total of twelve 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 16 January '11

Minor Planet Electronic Circulars

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

MPEC 2011-B02 - "11:38 UT" - 2011 AW55

<< DOU on 16 Jan. '11 >>  MPEC 2011-B01 - "07:12 UT" - Daily Orbit Update

Observers  on 16 January '11

Eleven observers appear in today's MPECs.

CodeObserver / observatory
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-B02 -- 2011 AW55
160Castelmartini Obs. in Italy, 5 in MPEC 2011-B01 -- 2010 WP8, 2010 LF86, 2002 OS4, 96590, 18882
703Catalina Sky Survey (CSS) in Arizona, 7 in MPEC 2011-B01 -- 2009 DV42, 36284, 153201, 5496, 4954, 2212, 1864
704LINEAR in New Mexico, 4 in MPEC 2011-B01 -- 2011 AO52, 2007 CA27, 163081, 3288
J75La Sagra Obs. in Spain, 1 in MPEC 2011-B01 -- 2003 BA21
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-B02 -- 2011 AW55
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2011-B01 & 2011-B02 -- 2011 AW55, 2011 AL52, 2010 LR68, 2008 FT6, 2003 HR32, 2001 YM4, 253106
A13Naef Obs. in Switzerland, 3 in MPEC 2011-B01 -- 2011 AV55, 2010 OQ1, 137052
204Schiaparelli Obs. in Italy, 2 in MPEC 2011-B01 -- 2011 AS26, 2001 DQ8
I28Starhoo Obs. in Massachusetts, 2 in MPEC 2011-B01 -- 2010 LR68, 2007 EM88
H10Tzec Maun Obs. Mayhill in New Mexico, 3 in MPEC 2011-B01 -- 5496, 3288, 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 January '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 (backup) risk pages.





Notes for Today's Latest Risk Assessments
2011 AN52NEODyS17022018-207495.76e-09-9.52-9.630NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2011-01-14.327 to 2011-01-15.273."
2011 AL52JPL Sentry17022017-21081202.8e-07-2.69-3.270JPL: "Analysis based on 20 observations spanning 2.0029 days (2011-Jan-14.0961 to 2011-Jan-16.09899)." Diameter approximately 1.167 km. from mean, weighted H=17.3.
NEODyS17022017-2084225.86e-08-3.14-3.410NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2011-01-14.097 to 2011-01-16.100."

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 16 January '11

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

1702Noted that JPL Sentry has posted 2011 AL52 as an impact risk - see above
Noted that NEODyS has posted 2011 AL52 as an impact risk - see above
Noted that NEODyS has posted 2011 AN52 as an impact risk - see above
Grabbed MPEC 2011-B01 - Daily Orbit Update - see above
Grabbed MPEC 2011-B02 - 2011 AW55 - see above