Contents  on 28 November '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 28 November '09

The MPC's NEO Confirmation Page has 4 listings: 4 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four updated listings. Of these, three 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 28 November '09

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-W135 - "17:55 UT" - 2009 WM139

<< DOU on 28 Nov. '09 >>  MPEC 2009-W134 - "07:13 UT" - Daily Orbit Update

Observers  on 28 November '09

Nine observing facilities appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 14 in MPEC 2009-W134 -- 2009 WL1, 2004 XM35, 2002 UN3, 99248, 96189, 89959, 85839, 215188, 207945, 162566, 152560, 5131, 4055, 1864
442Gualba Obs. in Spain, 1 in MPEC 2009-W134 -- 4015
379Hamamatsu-Yuto Obs. in Japan, 6 in MPEC 2009-W134 -- 2009 WV25, 2009 UV18, 2009 NA, 2006 UR, 2005 RQ6, 2005 MC
J75La Sagra Obs. in Spain, 1 in MPEC 2009-W134 -- 2009 VW
G96Mt. Lemmon Survey (MLS) in Arizona, 13 in MPEC 2009-W134 -- 2009 WP25, 2009 WM1, 2009 WH104, 2009 WF7, 2009 WE, 2009 WD54, 2009 VQ44, 2009 UP5, 2009 SG2, 2009 QD34, 2006 WN1, 1997 YM3, 1990 UA
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2009-W134 & 2009-W135 -- 2009 WM139, 86067
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2009-W134 -- 2009 KK8, 16064, 143404, 138852
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2009-W134 -- 2009 WN105, 2009 WJ1, 2009 WD11, 2009 WB11, 2009 VJ24, 2009 VA26, 2009 UF2, 2006 XG2, 2006 VG13
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2009-W134 -- 3552
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 November '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 WO106NEODyS16482011-2078244.73e-09-4.54-4.770NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2009/11/26.509 to 2009/11/27.546."
2009 WF106NEODyS16482020-207256.6e-10-5.69-5.880NEODyS: "Based on 33 optical observations (of which 1 are rejected as outliers) from 2009/11/25.409 to 2009/11/27.469."
2009 WD54JPL Sentry1648R E M O V E DJPL: Risk listing removed at 1130 UTC.
2009 WM1NEODyS16482018-2086773.92e-05-1.67-1.761NEODyS: "Based on 67 optical observations (of which 0 are rejected as outliers) from 2009/11/17.465 to 2009/11/27.518. NOTE: The Virtual Impactor in 2027/11/23.217 ... is rated as Torino Scale 1."
2009 WJ1JPL Sentry1648207815.8e-09-6.43-6.430JPL: "Analysis based on 46 observations spanning 10.967 days (2009-Nov-17.10881 to 2009-Nov-28.07621)." Diameter approximately 0.200 km. from mean, weighted H=21.1.
NEODyS1648R E M O V E D-

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 28 November '09

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

1816Grabbed MPEC 2009-W135 - 2009 WM139 - see above
1648Noted that JPL Sentry has removed 2009 WD54 as an impact risk - see above
Noted that NEODyS has posted 2009 WF106 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 WJ1 risk assessment - see above
Noted that NEODyS has removed 2009 WJ1 as an impact risk - see above
Noted that NEODyS has updated its 2009 WM1 risk assessment - see above
Noted that NEODyS has posted 2009 WO106 as an impact risk - see above
Grabbed MPEC 2009-W134 - Daily Orbit Update - see above