Contents  on 13 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 13 December '09

The MPC's NEO Confirmation Page has 2 listings: 2 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two updated listings. Of these, one was a "one nighter." So far The Tracking News has counted a total of eight 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 13 December '09

Minor Planet Electronic Circulars

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

MPEC 2009-X52 - "16:38 UT" - 2009 XR2

MPEC 2009-X51 - "16:33 UT" - 2009 XQ2

MPEC 2009-X50 - "16:28 UT" - 2009 XP2

MPEC 2009-X49 - "16:25 UT" - 2009 XO2

<< DOU on 13 Dec. '09 >>  MPEC 2009-X48 - "07:09 UT" - Daily Orbit Update

Observers  on 13 December '09

Eighteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield (ARO Westfield) in Illinois, 7 in MPEC 2009-X48 -- 2009 XV1, 2009 XO, 2009 XC2, 2009 XB2, 2009 WW25, 2009 TM10, 2009 SO103
235CAST Obs. in Italy, 1 in MPEC 2009-X48 -- 2009 XF2
160Castelmartini Obs. in Italy, 2 in MPEC 2009-X48 -- 20790, 3200
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2009-X49, 2009-X50, 2009-X51 & 2009-X52 -- 2009 XR2, 2009 XQ2, 2009 XP2, 2009 XO2
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2009-X48 -- 2009 XD, 2002 XN14, 2002 WP
704LINEAR in New Mexico, 6 in MPEC 2009-X48 -- 2009 UV18, 2008 WB59, 2007 UR3, 35396, 225416, 3553
J75La Sagra Obs. in Spain, 1 in MPEC 2009-X48 -- 6239
232Masquefa Obs. in Spain, 2 in MPEC 2009-X48 -- 2009 WX51, 4015
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2009-X48 -- 2005 VP118
932McCarthy Obs. in Connecticut, 2 in MPECs 2009-X50 & 2009-X52 -- 2009 XR2, 2009 XP2
900Moriyama Obs. in Japan, 1 in MPEC 2009-X52 -- 2009 XR2
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2009-X48 -- 2009 WD106
H06%Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2009-X52 -- 2009 XR2
H06|H. Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2009-X52 -- 2009 XR2
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2009-X48 -- 2009 XA2
204Schiaparelli Obs. in Italy, 7 in MPEC 2009-X48 -- 2009 XD, 2009 JL1, 2006 KZ37, 2004 TB18, 2002 WP, 2002 AP7, 4015
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2009-X48 & 2009-X49 -- 2009 XO2, 138883
I19Tanti Obs. in Argentina, 1 in MPEC 2009-X49 -- 2009 XO2
926Tenagra II Obs. in Arizona, 1 in MPEC 2009-X52 -- 2009 XR2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 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 Sentry22052048-208446.3e-10-8.42-8.940JPL: "Analysis based on 12 observations spanning .07173 days (2009-Dec-13.19944 to 2009-Dec-13.27117)." Diameter approximately 0.052 km. from mean, weighted H=24.1.
2009 XF2JPL Sentry16182029-2104371.9e-08-5.12-5.970JPL: "Analysis based on 10 observations spanning .65811 days (2009-Dec-12.26504 to 2009-Dec-12.92315)." Diameter approximately 0.400 km. from mean, weighted H=19.6.
NEODyS16182017-2080182.49e-08-5.12-5.450NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2009/12/12.266 to 2009/12/12.924."
2009 XC2JPL Sentry16182012-2105249.3e-09-3.11-3.170JPL: "Analysis based on 22 observations spanning 1.0548 days (2009-Dec-11.442 to 2009-Dec-12.49682)." Diameter approximately 1.300 km. from mean, weighted H=17.1.
NEODyS16182012-2087932.45e-08-2.94-3.280NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2009/12/11.443 to 2009/12/12.498."
2009 XOJPL Sentry16182062-207942.0e-08-5.34-5.640JPL: "Analysis based on 65 observations spanning 3.2007 days (2009-Dec-09.152 to 2009-Dec-12.352664)." Diameter approximately 0.330 km. from mean, weighted H=20.1.
NEODyS16182047-207954.49e-09-6.03-6.480NEODyS: "Based on 65 optical observations (of which 0 are rejected as outliers) from 2009/12/09.153 to 2009/12/12.353."

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 13 December '09

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

2205Noted that JPL Sentry has posted 2009 XQ2 as an impact risk - see above
1715Grabbed MPEC 2009-X49 - 2009 XO2 - see above
Grabbed MPEC 2009-X50 - 2009 XP2 - see above
Grabbed MPEC 2009-X51 - 2009 XQ2 - see above
Grabbed MPEC 2009-X52 - 2009 XR2 - see above
1618Noted that JPL Sentry has updated its 2009 XC2 risk assessment - see above
Noted that NEODyS has posted 2009 XC2 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 XF2 risk assessment - see above
Noted that NEODyS has posted 2009 XF2 as an impact risk - see above
Noted 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-X48 - Daily Orbit Update - see above