Contents  on 25 February '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 25 February '09

The MPC's NEO Confirmation Page is currently empty

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

New MPECs  on 25 February '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-D64 - "20:18 UT" - 2009 BP58

MPEC 2009-D63 - "18:29 UT" - 2009 DH39

MPEC 2009-D62 - "12:17 UT" - 2009 DS36

MPEC 2009-D61 - "12:14 UT" - 2009 DR36

<< DOU on 25 Feb. '09 >>  MPEC 2009-D60 - "07:07 UT" - Daily Orbit Update

Observers  on 25 February '09

Fifteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 18 in MPEC 2009-D60 -- 2009 DU10, 2009 DT10, 2009 DR3, 2009 DQ4, 2009 DO4, 2009 DN1, 2009 DG9, 2009 DD1, 2009 DC1, 2009 DB12, 2009 DB1, 2009 DA1, 2009 CU1, 2009 CR5, 2009 CP5, 2009 BT5, 2009 BL71, 2003 QN47
493Calar Alto Obs. in Spain, 2 in MPECs 2009-D61 & 2009-D62 -- 2009 DS36, 2009 DR36
703Catalina Sky Survey (CSS) in Arizona, 22 in MPECs 2009-D60 & 2009-D61 -- 2009 DZ, 2009 DU10, 2009 DR36, 2009 DR3, 2009 DQ4, 2009 DO4, 2009 DO1, 2009 DE1, 2009 DD1, 2009 DB12, 2009 DB1, 2009 AH16, 2006 GQ2, 2005 SG19, 2005 EF, 2003 YX1, 85275, 52768, 153953, 143651, 10302, 7480
J27El Guijo Obs. in Spain, 2 in MPEC 2009-D60 -- 2006 BC10, 89355
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2009-D63 -- 2009 DH39
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2009-D60 -- 2009 BD77, 2006 WZ2, 2004 EU9
J75La Sagra Obs. in Spain, 2 in MPEC 2009-D60 -- 2009 DR3, 2009 DA1
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2009-D61 & 2009-D62 -- 2009 DS36, 2009 DR36
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2009-D60 -- 10302
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2009-D64 -- 2009 BP58
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2009-D60 -- 2009 DQ4
H36Sandlot Obs. in Kansas, 1 in MPEC 2009-D62 -- 2009 DS36
E12Siding Spring Survey in New South Wales, 1 in MPEC 2009-D63 -- 2009 DH39
691Spacewatch 0.9m telescope in Arizona, 10 in MPEC 2009-D60 -- 2009 DL1, 2009 BD77, 2006 EV52, 85867, 205744, 162063, 141495, 139622, 7753, 4179
291Spacewatch 1.8m telescope in Arizona, 11 in MPEC 2009-D60 -- 2009 DW, 2009 DV, 2009 DO1, 2009 DD, 2009 DA1, 2009 CT1, 2009 BM58, 2009 BH58, 2009 BC58, 2005 JY80, 2000 CK59
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 February '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 DH39JPL Sentry21012012-2108144.2e-09-3.97-4.090JPL: "Analysis based on 11 observations spanning .27142 days (2009-Feb-25.47873 to 2009-Feb-25.75015)." Diameter approximately 0.666 km. from mean, weighted H=18.5.
2009 DE1JPL Sentry1514R E M O V E DJPL: Risk listing removed at 0953 UTC.
2009 DA1JPL Sentry1514206411.0e-08-6.56-6.560JPL: "Analysis based on 42 observations spanning 5.1836 days (2009-Feb-19.06293 to 2009-Feb-24.24653)." Diameter approximately 0.110 km. from mean, weighted H=22.4.
NEODyS1514206416.77e-09-6.78-6.780NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2009/02/19.064 to 2009/02/24.247."

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 25 February '09

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

2101Noted that JPL Sentry has posted 2009 DH39 as an impact risk - see above
Grabbed MPEC 2009-D64 - 2009 BP58 - see above
1858Grabbed MPEC 2009-D63 - 2009 DH39 - see above
Noted that the NEOCP has become empty
1514Noted that JPL Sentry has updated its 2009 DA1 risk assessment - see above
Noted that NEODyS has updated its 2009 DA1 risk assessment - see above
Noted that JPL Sentry has removed 2009 DE1 as an impact risk - see above
Grabbed MPEC 2009-D60 - Daily Orbit Update - see above
Grabbed MPEC 2009-D61 - 2009 DR36 - see above
Grabbed MPEC 2009-D62 - 2009 DS36 - see above