Contents  on 14 September '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 14 September '11

The MPC's NEO Confirmation Page has 1 listing

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one object listed. This was a "one nighter." So far The Tracking News has counted a total of two listings on the NEOCP today.

New MPECs  on 14 September '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-R52 - "15:26 UT" - 2011 RV14

<< DOU on 14 Sept. '11 >>  MPEC 2011-R51 - "06:02 UT" - Daily Orbit Update

MPEC 2011-R50 - "04:19 UT" - S/2010 J 2

MPEC 2011-R49 - "04:15 UT" - S/2010 J 1

Observers  on 14 September '11

Twelve observers appear in today's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2011-R51 -- 2006 JF42
H21Astronomical Research Obs. Westfield in Illinois, 31 in MPECs 2011-R51 & 2011-R52 -- 2011 RV14, 2011 RR12, 2011 RJ1, 2011 QY37, 2011 QS49, 2011 QS2, 2011 QG9, 2011 QF23, 2011 QF14, 2011 QE48, 2011 PS, 2011 OV4, 2011 OM5, 2011 NZ, 2011 MV1, 2011 MO4, 2011 HD63, 2011 GA55, 2009 SK1, 2008 RJ1, 2008 JO, 2006 SV134, 2004 JO2, 2003 QC10, 2001 UE5, 2001 QP181, 2000 SH8, 1998 SC15, 250458, 137799, 7092
160Castelmartini Obs. in Italy, 2 in MPEC 2011-R51 -- 2011 LJ19, 2011 HD63
203GiaGa Obs. in Italy, 3 in MPEC 2011-R51 -- 2011 OV4, 2011 OQ5, 2011 LJ19
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 3 in MPEC 2011-R51 -- 2011 RZ, 2009 CS, 2008 UC
C01Lohrmann Obs. in Germany, 3 in MPEC 2011-R51 -- 2011 OV4, 2011 KN9, 138524
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-R51 -- 2011 PE2
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2011-R51 -- 2011 LJ19, 2009 QZ6, 2004 JO2
261&Rob Matson in southern California using the Palomar Digitized Sky Survey in southern California, 1 in MPEC 2011-R51 -- 2011 HC36
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2011-R51 & 2011-R52 -- 2011 RV14, 267940
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-R51 -- 2011 LC19
645Sloan Digital Sky Survey (SDSS) in New Mexico, 11 in MPEC 2011-R51 -- 1999 SO5, 1996 FO3, 286080, 194268, 194006, 187040, 185851, 177614, 141614, 141053, 136849
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 September '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 PE2JPL Sentry15542027-210239.0e-05-2.68-2.680JPL: "Analysis based on 86 observations spanning 32.140 days (2011-Aug-08.06387 to 2011-Sep-09.20343)." Diameter approximately 0.083 km. from mean, weighted H=23.1.
NEODyS15542027-209027.2e-06-3.78-3.780NEODyS: "Based on 86 optical observations (of which 0 are rejected as outliers) from 2011-08-08.065 to 2011-09-09.204."

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 14 September '11

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

1554Noted that JPL Sentry has updated its 2011 PE2 risk assessment - see above
Noted that NEODyS has updated its 2011 PE2 risk assessment - see above
Grabbed MPEC 2011-R51 - Daily Orbit Update - see above
Grabbed MPEC 2011-R52 - 2011 RV14 - see above
0554Grabbed MPEC 2011-R49 - S/2010 J 1 - see above
Grabbed MPEC 2011-R50 - S/2010 J 2 - see above