Contents  on 23 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 23 January '11

The MPC's NEO Confirmation Page has 4 listings: 4 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of seven 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 23 January '11

Minor Planet Electronic Circulars

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

MPEC 2011-B24 - "20:17 UT" - 2011 BG10

MPEC 2011-B23 - "20:04 UT" - 2011 BF10

<< DOU on 23 Jan. '11 >>  MPEC 2011-B22 - "07:07 UT" - Daily Orbit Update

MPEC 2011-B21 - "03:04 UT" - 2011 BJ2

Observers  on 23 January '11

Ten observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2011-B22 -- 2011 BB, 2011 AL37, 2010 YB, 2005 EE, 2004 BW58, 2002 TD60, 136635
448Desert Moon Obs. in New Mexico, 4 in MPEC 2011-B22 -- 2011 AN16, 2011 AL37, 2011 AG5, 2010 YH
203GiaGa Obs. in Italy, 4 in MPEC 2011-B22 -- 2011 AL37, 2010 WE9, 2002 BN, 18882
J95Great Shefford Obs. in England, 1 in MPEC 2011-B22 -- 2007 CA27
A17Guidestar Obs. in Germany, 3 in MPEC 2011-B22 -- 2011 AM24, 2011 AL37, 2007 CA27
B19Iluro Obs. in Spain, 10 in MPEC 2011-B22 -- 36284, 253841, 23183, 162781, 137924, 137052, 4954, 3554, 3199, 1981
560Madonna di Dossobuono Obs. in Italy, 1 in MPEC 2011-B22 -- 2011 AL37
A06Mataro Obs. in Spain, 3 in MPEC 2011-B22 -- 96590, 18882, 152563
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2011-B21, 2011-B23 & 2011-B24 -- 2011 BJ2, 2011 BG10, 2011 BF10
H36Sandlot Obs. in Kansas, 2 in MPEC 2011-B22 -- 2011 BA, 2011 AL37
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 BG10JPL Sentry23252013-2111461.3e-07-7.31-7.950JPL: "Analysis based on 17 observations spanning .13652 days (2011-Jan-23.26948 to 2011-Jan-23.406)." Diameter approximately 0.019 km. from mean, weighted H=26.2.
2011 AM24JPL Sentry1627R E M O V E DJPL: Risk listing removed at 1051 UTC.
2011 AG5NEODyS20032036-205892.23e-05-3.16-3.350NEODyS: "Based on 60 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-01-22.235."
JPL Sentry16272036-205772.3e-05-3.16-3.350JPL: "Analysis based on 60 observations spanning 13.967 days (2011-Jan-08.2673 to 2011-Jan-22.23445)." Diameter approximately 0.130 km. from mean, weighted H=22.0.

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 23 January '11

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

2325Noted that JPL Sentry has posted 2011 BG10 as an impact risk - see above
2110Grabbed MPEC 2011-B23 - 2011 BF10 - see above
Grabbed MPEC 2011-B24 - 2011 BG10 - see above
2003Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
1627Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has removed 2011 AM24 as an impact risk - see above
Grabbed MPEC 2011-B22 - Daily Orbit Update - see above
0318Grabbed MPEC 2011-B21 - 2011 BJ2 - see above