Contents  on 24 February '10


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 '10

The MPC's NEO Confirmation Page has 6 listings: 1 new, 5 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and five updated listings. 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 24 February '10

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 2010-D77 - "13:53 UT" - 2010 DK34

<< DOU on 24 Feb. '10 >>  MPEC 2010-D76 - "07:23 UT" - Daily Orbit Update

Observers  on 24 February '10

Eleven observing facilities appear in today's MPECs.

CodeObserver / observatory
B75Betelgeuse Station in Italy, 5 in MPEC 2010-D76 -- 2006 WZ2, 68350, 52768, 162385, 143651
379Hamamatsu-Yuto Obs. in Japan, 6 in MPEC 2010-D76 -- 2009 UN3, 2009 UD2, 2008 EE, 2006 EE1, 2001 PT9, 2000 CO101
682Kanab Obs. in Utah, 1 in MPEC 2010-D76 -- 1996 BA1
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2010-D76 -- 2010 DF1
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2010-D76 -- 2010 DP, 2010 BB3, 2010 AJ, 2009 TM10, 2009 NA
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2010-D76 -- 2008 EE, 1999 RC32
H36Sandlot Obs. in Kansas, 2 in MPECs 2010-D76 & 2010-D77 -- 2010 DX1, 2010 DK34
204Schiaparelli Obs. in Italy, 2 in MPEC 2010-D76 -- 2009 XC2, 2006 EE1
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2010-D76 -- 2002 CY58, 2001 RZ11
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2010-D76 -- 2010 DM, 2010 DG1
C51WISE in Earth polar orbit, 2 in MPECs 2010-D76 & 2010-D77 -- 2010 DK34, 2004 TB18
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 February '10

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
2010 DG1JPL Sentry1500205011.8e-09-8.19-8.190JPL: "Analysis based on 33 observations spanning 7.0698 days (2010-Feb-17.2105 to 2010-Feb-24.28031)." Diameter approximately 0.044 km. from mean, weighted H=24.4.
NEODyS1500205018.47e-11-9.50-9.500NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2010/02/17.211 to 2010/02/24.281."
2010 DMJPL Sentry1500R E M O V E DJPL: Risk listing removed at 1054 UTC.
NEODyS1500R E M O V E D-
2010 CL19JPL Sentry22012019-2108401.4e-06-2.01-2.390JPL: "Analysis based on 32 observations spanning 4.0113 days (2010-Feb-13.09558 to 2010-Feb-17.10688)." Diameter approximately 0.967 km. from mean, weighted H=17.7.
2005 YU55NEODyS21032043-2109954.13e-04-2.16-2.511NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2005/12/24.299 to 2010/02/20.542. NOTE: The Virtual Impactors in 2103/11/10.386 and 2103/11/10.488 ... are rated as Torino Scale 1."
JPL Sentry20002043-2109539.5e-04-1.79-1.901JPL: "Analysis based on 46 observations spanning 1519.2 days (2005-Dec-24.29832 to 2010-Feb-20.541105)." Diameter approximately 0.140 km. from mean, weighted H=22.0.

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 '10

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

2201Noted that JPL Sentry has posted 2010 CL19 as an impact risk - see above
2103Noted that NEODyS has updated its 2005 YU55 risk assessment - see above
2000Noted that JPL Sentry has updated its 2005 YU55 risk assessment - see above
1500Noted that JPL Sentry has updated its 2010 DG1 risk assessment - see above
Noted that NEODyS has updated its 2010 DG1 risk assessment - see above
Noted that JPL Sentry has removed 2010 DM as an impact risk - see above
Noted that NEODyS has removed 2010 DM as an impact risk - see above
Grabbed MPEC 2010-D76 - Daily Orbit Update - see above
Grabbed MPEC 2010-D77 - 2010 DK34 - see above