Contents  on 30 December '09

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 30 December '09

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 2358 UTC). It was last noted active on December 27th.

New MPECs  on 30 December '09

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2009-Y63 - "23:02 UT" - 2008 YZ32


MPEC 2009-Y62 - "16:42 UT" - 2007 GW5


<< DOU on 30 Dec. '09 >>  MPEC 2009-Y61 - "07:11 UT" - Daily Orbit Update

Observers  on 30 December '09

Six observing facilities appear in today's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2009-Y61 -- 54789
H21Astronomical Research Obs. Westfield (ARO Westfield) in Illinois, 10 in MPEC 2009-Y61 -- 2009 XT6, 2009 XR2, 2009 XC2, 2009 WR6, 2007 UR3, 2007 HZ, 2006 UR, 2006 BN6, 2002 VD118, 2002 LV
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2009-Y62 -- 2007 GW5
932McCarthy Obs. in Connecticut, 2 in MPEC 2009-Y61 -- 2009 XO, 2009 WZ104
D906Andrew Lowe via RAS Obs. Moorook in South Australia, 1 in MPEC 2009-Y63 -- 2008 YZ32
204Schiaparelli Obs. in Italy, 2 in MPEC 2009-Y61 -- 2009 XK8, 2004 XD50
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 December '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 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 XOJPL Sentry15582038-204522.7e-07-4.07-4.350JPL: "Analysis based on 117 observations spanning 20.140 days (2009-Dec-09.152 to 2009-Dec-29.29219)." Diameter approximately 0.300 km. from mean, weighted H=20.2.
NEODyS1558204511.57e-07-4.35-4.350NEODyS: "Based on 117 optical observations (of which 0 are rejected as outliers) from 2009/12/09.153 to 2009/12/29.293."

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 30 December '09

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

2358Grabbed MPEC 2009-Y63 - 2008 YZ32 - see above
1837Grabbed MPEC 2009-Y62 - 2007 GW5 - see above
1558Noted that JPL Sentry has updated its 2009 XO risk assessment - see above
Noted that NEODyS has updated its 2009 XO risk assessment - see above
Grabbed MPEC 2009-Y61 - Daily Orbit Update - see above