Contents  on 8 October '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 8 October '09

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There were two listings noted earlier today.

New MPECs  on 8 October '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-T25 - "20:15 UT" - 2009 TK

<< DOU on 8 Oct. '09 >>  MPEC 2009-T24 - "06:08 UT" - Daily Orbit Update

Observers  on 8 October '09

Ten observing facilities appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2009-T24 -- 2009 SG2
160Castelmartini Obs. in Italy, 6 in MPEC 2009-T24 -- 2009 SM103, 2002 NP1, 2000 CO101, 54401, 162181, 12711
E10Faulkes Telescope South in New South Wales, 5 in MPEC 2009-T24 -- 2009 SL2, 2009 SA100, 2009 RT1, 2009 RM, 2009 RD1
J95Great Shefford Obs. in England, 1 in MPEC 2009-T25 -- 2009 TK
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2009-T24 -- 2009 ST103
H36Sandlot Obs. in Kansas, 6 in MPEC 2009-T24 -- 2009 SW17, 2009 SM104, 2009 SC100, 2009 QD34, 2009 QB35, 159402
E12Siding Spring Survey in New South Wales, 1 in MPEC 2009-T25 -- 2009 TK
954Teide Obs. in the Canary Islands, 1 in MPEC 2009-T24 -- 2009 KC3
926Tenagra II Obs. in Arizona, 1 in MPEC 2009-T24 -- 2009 SL104
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2009-T24 -- 159402
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 October '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 TJNEODyS1318205212.24e-09-7.40-7.400NEODyS: "Based on 8 optical observations (of which 0 are rejected as outliers) from 2009/10/07.545 to 2009/10/07.738."
JPL Sentry02532040-2108192.1e-08-6.50-7.240JPL: "Analysis based on 8 observations spanning .19272 days (2009-Oct-07.54444 to 2009-Oct-07.73716)." Diameter approximately 0.107 km. from mean, weighted H=22.5.
2004 MN4NEODyS04532036-210367.36e-06-2.97-3.080NEODyS: "Based on 1399 optical observations (of which 5 are rejected as outliers) from 2004/03/15.127 to 2008/01/09.666 and also on seven radar data points on 2005/01/27, 2005/01/29, 2005/01/31, 2005/08/07 and 2006/05/06."
JPL Sentry02532036-210367.4e-06-2.97-3.080JPL: "Analysis based on 2 radar delay, 5 Doppler, and 633 optical observations spanning 1395.6 days (2004-Mar-15.10789 to 2008-Jan-09.665088)." Diameter approximately 0.270 km. from mean, weighted H=19.7.

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 8 October '09

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

2301Noted that the NEOCP has become empty
2117Noted that the NEOCP has become active
2029Noted that the NEOCP has become empty
2019Grabbed MPEC 2009-T25 - 2009 TK - see above
1437Noted that the NEOCP has become active
1318Noted that NEODyS has posted 2009 TJ as an impact risk - see above
Grabbed MPEC 2009-T24 - Daily Orbit Update - see above
0453Noted that NEODyS has updated its 2004 MN4 risk assessment - see above
0253Noted that JPL Sentry has updated its 99942 Apophis (2004 MN4) risk assessment - see above
Noted that JPL Sentry has posted 2009 TJ as an impact risk - see above
Noted that the NEOCP has become empty