Contents  on 22 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 22 January '11

The MPC's NEO Confirmation Page has 2 listings: 2 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two updated listings. 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 22 January '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 22 Jan. '11 >>  MPEC 2011-B20 - "07:07 UT" - Daily Orbit Update

Observers  on 22 January '11

Seven observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 29 in MPEC 2011-B20 -- 2011 BB, 2011 BA, 2011 AO52, 2011 AM12, 2011 AL1, 2011 AG5, 2011 AA23, 2010 YS, 2010 YH, 2010 XZ, 2010 XY82, 2010 XL69, 2010 XK52, 2010 XG3, 2010 WQ7, 2010 WP8, 2010 VZ, 2010 VX39, 2010 UX7, 2010 RF181, 2010 PM10, 2010 OC101, 2010 NW117, 2009 DV42, 2004 YZ23, 2003 MC7, 2001 DQ8, 1999 PJ1, 137125
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPEC 2011-B20 -- 2011 AS26, 2011 AR26, 2011 AO4
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2011-B20 -- 2011 AN16
J95Great Shefford Obs. in England, 1 in MPEC 2011-B20 -- 2011 AG5
204Schiaparelli Obs. in Italy, 11 in MPEC 2011-B20 -- 2011 AV55, 2011 AO52, 2010 XK52, 2010 RO82, 2007 MK13, 2007 EX, 2007 CA27, 2001 XY10, 4954, 3288, 3122
G56Walnut Creek Obs. in northern California, 1 in MPEC 2011-B20 -- 2010 YH
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2011-B20 -- 2010 XP51, 2008 CM20, 96590
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 AM12NEODyS1655R E M O V E D-
JPL Sentry1655R E M O V E DJPL: Risk listing removed at 1051 UTC.
2011 AG5JPL Sentry16552036-205261.8e-05-3.27-3.470JPL: "Analysis based on 56 observations spanning 13.535 days (2011-Jan-08.2673 to 2011-Jan-21.8026)." Diameter approximately 0.130 km. from mean, weighted H=22.1.
NEODyS16552032-205871.79e-05-3.28-3.470NEODyS: "Based on 56 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-01-21.803."

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 22 January '11

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

1655Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has removed 2011 AM12 as an impact risk - see above
Noted that NEODyS has removed 2011 AM12 as an impact risk - see above
Grabbed MPEC 2011-B20 - Daily Orbit Update - see above