Contents  on 14 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 14 December '09

The MPC's NEO Confirmation Page has 3 listings: 1 new, 2 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and two updated listings. All of these were "one nighters." So far The Tracking News has counted a total of seven 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 14 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-X55 - "22:51 UT" - 2009 XT6

MPEC 2009-X54 - "22:47 UT" - 2009 XS6

<< DOU on 14 Dec. '09 >>  MPEC 2009-X53 - "07:13 UT" - Daily Orbit Update

Observers  on 14 December '09

Fourteen observing facilities appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 2 in MPEC 2009-X53 -- 2009 XR2, 2009 XD
H21Astronomical Research Obs. Westfield (ARO Westfield) in Illinois, 13 in MPEC 2009-X53 -- 2009 XV1, 2009 XV, 2009 XD, 2009 WN, 2009 SV171, 2009 RD1, 2009 QH2, 2009 FF19, 2006 WY2, 2005 JF21, 2004 XJ3, 2004 TB18, 1999 RH33
A81Balzaretto Obs. in Italy, 4 in MPEC 2009-X53 -- 2009 WZ104, 2005 TY51, 2002 XN14, 2002 WP
703Catalina Sky Survey (CSS) in Arizona, 7 in MPEC 2009-X53 -- 2009 XQ2, 2002 XN14, 217683, 16834, 143678, 8201, 6239
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2009-X53 -- 35396
143Gnosca Obs. in Switzerland, 1 in MPEC 2009-X54 -- 2009 XS6
J95Great Shefford Obs. in England, 1 in MPEC 2009-X53 -- 2009 XP2
704LINEAR in New Mexico, 16 in MPECs 2009-X53, 2009-X54 & 2009-X55 -- 2009 XT6, 2009 XS6, 2009 UV18, 2009 QD34, 2009 JL1, 2006 KZ37, 2002 VC92, 1998 HJ3, 54401, 143678, 5131, 4486, 4015, 3552, 1627, 433
J75La Sagra Obs. in Spain, 3 in MPEC 2009-X53 -- 2006 UR, 99248, 35396
130Lumezzane Obs. in Italy, 4 in MPEC 2009-X53 -- 2002 WP, 9950, 4015, 3552
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2009-X53 -- 2009 NA, 30825
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPECs 2009-X53 & 2009-X54 -- 2009 XS6, 2009 XO2
926Tenagra II Obs. in Arizona, 1 in MPEC 2009-X53 -- 2009 KL2
D25Tzec Maun Obs. Pingelly in Western Australia, 1 in MPEC 2009-X53 -- 35396
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 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 XQ2JPL Sentry1552R E M O V E DJPL: Risk listing removed at 1059 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 14 December '09

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

2319Grabbed MPEC 2009-X54 - 2009 XS6 - see above
Grabbed MPEC 2009-X55 - 2009 XT6 - see above
1552Noted that JPL Sentry has removed 2009 XQ2 as an impact risk - see above
Grabbed MPEC 2009-X53 - Daily Orbit Update - see above