Contents  on 24 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 24 February '09

The MPC's NEO Confirmation Page has 3 listings: 1 new, 2 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and two updated listings. All of these were "one nighters." So far The Tracking News has counted a total of six objects listed on the NEOCP at some point today.

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 24 February '09

Minor Planet Electronic Circulars

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

<< DOU on 24 Feb. '09 >>  MPEC 2009-D59 - "07:07 UT" - Daily Orbit Update

Observers  on 24 February '09

Ten observing facilities appear in today's MPEC.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 30 in MPEC 2009-D59 -- 2009 DZ, 2009 DV, 2009 DQ4, 2009 DP4, 2009 DO4, 2009 DO1, 2009 DN4, 2009 DN1, 2009 DM1, 2009 DL1, 2009 DF1, 2009 DD1, 2009 DD, 2009 DC1, 2009 DA1, 2009 CZ2, 2009 CV5, 2009 CT5, 2009 CS5, 2009 CP5, 2009 CA3, 2009 CA2, 2009 BK71, 2009 BD81, 2008 YG26, 2008 XP, 2008 WM64, 2005 LH8, 2003 AB23, 2000 CT101
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2009-D59 -- 2009 BP58, 2008 UC95, 2008 MB5
B84Cyclops Obs. in The Netherlands, 2 in MPEC 2009-D59 -- 2009 CO5, 8567
704LINEAR in New Mexico, 10 in MPEC 2009-D59 -- 2009 BD77, 2004 EU9, 2002 VY94, 1999 CW8, 55532, 35107, 22753, 206359, 200840, 3122
J75La Sagra Obs. in Spain, 1 in MPEC 2009-D59 -- 2009 DA1
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2009-D59 -- 2009 DR3, 2009 CS, 2009 BA71, 2006 WZ2, 2006 BC10
204Schiaparelli Obs. in Italy, 3 in MPEC 2009-D59 -- 2008 EA32, 2004 EU9, 1980
587Sormano Obs. in Italy, 3 in MPEC 2009-D59 -- 2009 DZ, 2009 DR3, 2009 CP5
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2009-D59 -- 2009 CR4
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2009-D59 -- 2009 DS10, 2009 CS5, 2009 CR4, 2009 BM58
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 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 DS10NEODyS1459R E M O V E D-
JPL Sentry1459R E M O V E DJPL: Risk listing removed at 0951 UTC.
2009 DM1NEODyS15002010-2087355.89e-08-3.22-3.680NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2009/02/19.116 to 2009/02/23.043."
JPL Sentry14592010-2083265.5e-08-3.25-3.690JPL: "Analysis based on 33 observations spanning 3.9276 days (2009-Feb-19.11474 to 2009-Feb-23.04234)." Diameter approximately 1.100 km. from mean, weighted H=17.4.
2009 DA1NEODyS1500206411.8e-08-6.35-6.350NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2009/02/19.064 to 2009/02/23.985."
JPL Sentry1459206412.5e-08-6.16-6.160JPL: "Analysis based on 34 observations spanning 4.9215 days (2009-Feb-19.06293 to 2009-Feb-23.98439)." Diameter approximately 0.110 km. from mean, weighted H=22.4.

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 24 February '09

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

1500Noted that NEODyS has updated its 2009 DA1 risk assessment - see above
Noted that NEODyS has updated its 2009 DM1 risk assessment - see above
1459Noted that JPL Sentry has updated its 2009 DA1 risk assessment - see above
Noted that JPL Sentry has updated its 2009 DM1 risk assessment - see above
Noted that JPL Sentry has removed 2009 DS10 as an impact risk - see above
Noted that NEODyS has removed 2009 DS10 as an impact risk - see above
Grabbed MPEC 2009-D59 - Daily Orbit Update - see above