Contents  on 26 February '09

Resources:

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 26 February '09

The MPC's NEO Confirmation Page has 6 listings: 6 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six updated listings. All of these were "one nighters."

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.

New MPECs  on 26 February '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-D66 - "13:20 UT" - 2009 DM40


<< DOU on 26 Feb. '09 >>  MPEC 2009-D65 - "07:07 UT" - Daily Orbit Update

Observers  on 26 February '09

Fourteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 3 in MPEC 2009-D65 -- 2009 BF81, 2008 YS27, 2008 SH82
B88Bigmuskie Obs., 2 in MPEC 2009-D65 -- 22771, 12711
493Calar Alto Obs. in Spain, 3 in MPEC 2009-D65 -- 2009 DS36, 2009 CB3, 2006 BC10
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2009-D65 & 2009-D66 -- 2009 DR36, 2009 DM40, 2009 CB3, 2009 BA71, 2006 BC10, 18109
J27El Guijo Obs. in Spain, 1 in MPEC 2009-D65 -- 36284
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2009-D65 -- 2009 DS36
704LINEAR in New Mexico, 7 in MPEC 2009-D65 -- 2002 VY94, 1994 AW1, 35396, 22099, 20460, 175706, 1627
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPEC 2009-D65 -- 2009 DE1, 2009 DA1, 2009 CB3, 2009 BF58
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2009-D65 -- 2009 DR3, 25916, 142348
A13Naef Obs. in Switzerland, 2 in MPEC 2009-D65 -- 2009 DR3, 2009 BA71
H36Sandlot Obs. in Kansas, 2 in MPEC 2009-D65 -- 2009 DR36, 2009 CB3
E12Siding Spring Survey in New South Wales, 1 in MPEC 2009-D65 -- 16834
510Siegen Obs. in Germany, 2 in MPEC 2009-D65 -- 4179, 1864
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2009-D65 -- 2009 DM1, 2009 DH39, 2009 DA1, 2009 CS5, 2009 CR5, 2009 CR4, 2009 BE2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2009 DH39JPL Sentry14582013-207442.0e-09-4.75-4.900JPL: "Analysis based on 13 observations spanning .67204 days (2009-Feb-25.47873 to 2009-Feb-26.15077)." Diameter approximately 0.580 km. from mean, weighted H=18.8.
2009 DM1NEODyS1458R E M O V E D-
JPL Sentry1458R E M O V E DJPL: Risk listing removed at 0947 UTC.
2009 DA1NEODyS1458206411.24e-11-9.52-9.520NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2009/02/19.064 to 2009/02/26.221."
JPL Sentry1458R E M O V E DJPL: Risk listing removed at 0950 UTC.
2009 CB3NEODyS1458R E M O V E D-
JPL Sentry1458R E M O V E DJPL: Risk listing removed at 1006 UTC.
2009 BF58JPL Sentry14582055-2088211.9e-04-5.11-5.320JPL: "Analysis based on 56 observations spanning 28.173 days (2009-Jan-28.26267 to 2009-Feb-25.43554)." Diameter approximately 0.012 km. from mean, weighted H=27.2.
NEODyS14582055-2090401.86e-04-5.12-5.330NEODyS: "Based on 56 optical observations (of which 0 are rejected as outliers) from 2009/01/28.263 to 2009/02/25.436."

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 26 February '09

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

1458Noted that JPL Sentry has updated its 2009 BF58 risk assessment - see above
Noted that NEODyS has updated its 2009 BF58 risk assessment - see above
Noted that JPL Sentry has removed 2009 CB3 as an impact risk - see above
Noted that NEODyS has removed 2009 CB3 as an impact risk - see above
Noted that JPL Sentry has removed 2009 DA1 as an impact risk - see above
Noted that NEODyS has updated its 2009 DA1 risk assessment - see above
Noted that JPL Sentry has updated its 2009 DH39 risk assessment - see above
Noted that JPL Sentry has removed 2009 DM1 as an impact risk - see above
Noted that NEODyS has removed 2009 DM1 as an impact risk - see above
Grabbed MPEC 2009-D65 - Daily Orbit Update - see above
Grabbed MPEC 2009-D66 - 2009 DM40 - see above
0458Noted that the NEOCP has become active