Contents  on 4 January '10

Resources:

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 4 January '10

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty and hasn't been noted by The Tracking News as being active yet today (checked at 2321 UTC). It was last noted active yesterday.

New MPECs  on 4 January '10

Minor Planet Electronic Circulars

As of last check at 2321 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2010-A13 - "15:03 UT" - 2008 RJ1


<< DOU on 4 Jan. '10 >>  MPEC 2010-A12 - "07:09 UT" - Daily Orbit Update

Observers  on 4 January '10

Thirteen observing facilities appear in today's MPECs.

CodeObserver / observatory
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2010-A12 -- 2007 MK13
160Castelmartini Obs. in Italy, 10 in MPEC 2010-A12 -- 2005 TY51, 2002 WP, 2002 NW16, 96590, 35396, 138937, 5626, 4015, 3552, 433
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2010-A12 -- 2005 YU3
448Desert Moon Obs. in New Mexico, 6 in MPEC 2010-A12 -- 2009 XO, 2009 XC2, 2009 WF104, 2009 SO103, 2006 YY2, 137062
151Eschenberg Obs. in Switzerland, 4 in MPEC 2010-A12 -- 2007 MK13, 2006 KZ37, 2002 XN14, 2001 BP61
J95Great Shefford Obs. in England, 1 in MPEC 2010-A12 -- 2005 YU3
240Herrenberg Obs. in Germany, 1 in MPEC 2010-A12 -- 25143
J38La Vara Obs. in Spain, 1 in MPEC 2010-A12 -- 4015
844Los Molinos Obs. in Uruguay, 1 in MPEC 2010-A12 -- 85818
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2010-A13 -- 2008 RJ1
A13Naef Obs. in Switzerland, 2 in MPEC 2010-A12 -- 2007 MK13, 2001 QH142
691Spacewatch 0.9m telescope in Arizona, 10 in MPEC 2010-A12 -- 2009 YS6, 2009 WC11, 2009 RN, 2000 OG8, 39572, 222008, 190166, 152560, 136618, 8567
291Spacewatch 1.8m telescope in Arizona, 11 in MPEC 2010-A12 -- 2009 YT6, 2009 YO, 2009 XZ1, 2009 XQ1, 2009 XJ8, 2009 XG8, 2009 WL6, 2009 WG54, 2009 WG104, 2005 FN4, 2002 TS67
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 January '10

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2321 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. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2009 YS6JPL Sentry1544203311.5e-10-3.45-3.450JPL: "Analysis based on 37 observations spanning 8.1029 days (2009-Dec-17.39267 to 2009-Dec-25.49561)." Diameter approximately 4.400 km. from mean, weighted H=14.4.
NEODyS15442018-2090211.49e-09-2.48-2.900NEODyS: "Based on 37 optical observations (of which 0 are rejected as outliers) from 2009/12/17.393 to 2009/12/25.496."
2009 XOJPL Sentry1544203811.8e-07-4.22-4.220JPL: "Analysis based on 131 observations spanning 25.250 days (2009-Dec-09.152 to 2010-Jan-03.40215)." Diameter approximately 0.300 km. from mean, weighted H=20.3.
NEODyS15442038-208332.25e-07-4.18-4.220NEODyS: "Based on 131 optical observations (of which 0 are rejected as outliers) from 2009/12/09.153 to 2010/01/03.403."

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 4 January '10

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

1544Noted that JPL Sentry has updated its 2009 XO risk assessment - see above
Noted that NEODyS has updated its 2009 XO risk assessment - see above
Noted that JPL Sentry has posted 2009 YS6 as an impact risk - see above
Noted that NEODyS has posted 2009 YS6 as an impact risk - see above
Grabbed MPEC 2010-A12 - Daily Orbit Update - see above
Grabbed MPEC 2010-A13 - 2008 RJ1 - see above