Contents  on 9 December '09


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 9 December '09

The MPC's NEO Confirmation Page has 3 listings: 3 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three updated listings.

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 9 December '09

Minor Planet Electronic Circulars

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

MPEC 2009-X30 - "17:46 UT" - 2007 WV3

<< DOU on 9 Dec. '09 >>  MPEC 2009-X29 - "07:08 UT" - Daily Orbit Update

Observers  on 9 December '09

Thirteen observing facilities appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2009-X29 -- 2002 WP
H21Astronomical Research Obs. Westfield (ARO Westfield) in Illinois, 16 in MPEC 2009-X29 -- 2009 WR6, 2009 WR25, 2009 WP25, 2009 WN106, 2009 WN, 2009 WL1, 2009 WF, 2009 UM3, 2009 UE19, 2009 TG8, 2009 SF2, 2009 OP9, 2004 TB18, 2002 AP7, 2001 TE2, 138013
639Dresden Obs. in Germany, 1 in MPEC 2009-X29 -- 2009 WZ104
168Kourovskaya Obs. in Russia, 2 in MPEC 2009-X29 -- 16834, 143651
J38La Vara Obs. in Spain, 1 in MPEC 2009-X29 -- 4015
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2009-X29 & 2009-X30 -- 2009 WM1, 2007 WV3
A99Monte Baldo Obs. in Italy, 1 in MPEC 2009-X29 -- 2009 XD
D92Osaki Obs. in Japan, 1 in MPEC 2009-X29 -- 2009 XD
A53Peschiera del Garda Obs. in Italy, 2 in MPEC 2009-X29 -- 2009 XD, 2009 NA
B74Santa Maria de Montmagastrell Obs. in Spain, 2 in MPEC 2009-X29 -- 2009 ST19, 4015
204Schiaparelli Obs. in Italy, 9 in MPEC 2009-X29 -- 2009 WY7, 2009 WX6, 2009 WV25, 2009 WO6, 2009 WF, 2009 WB54, 2009 TM10, 2006 UR, 1998 HJ3
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2009-X29 -- 2009 UN3, 2009 OG
A48Verona Obs. in Italy, 5 in MPEC 2009-X29 -- 2009 XD, 2009 WF, 2009 WD106, 2009 VZ, 2009 NA
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 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.





Notes for Today's Latest Risk Assessments
2009 WM1NEODyS15252062-207925.02e-08-5.16-5.290NEODyS: "Based on 79 optical observations (of which 0 are rejected as outliers) from 2009/11/17.465 to 2009/12/06.607."
JPL Sentry1525R E M O V E DJPL: Risk listing removed at 0956 UTC.

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 9 December '09

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

1800Grabbed MPEC 2009-X30 - 2007 WV3 - see above
1525Noted that JPL Sentry has removed 2009 WM1 as an impact risk - see above
Noted that NEODyS has updated its 2009 WM1 risk assessment - see above
Grabbed MPEC 2009-X29 - Daily Orbit Update - see above