Contents  on 12 March '11

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.

Radar Astrometry  on 12 March '11

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 0236 UTC when the database was dated 11 March

NEOCP Activity  on 12 March '11

The MPC's NEO Confirmation Page has 8 listings: 6 new, 2 updated

When last checked at 2311 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six new and two updated listings. Of these, five were "one nighters." So far The Tracking News has counted a total of twelve listings on the NEOCP today.

New MPECs  on 12 March '11

Minor Planet Electronic Circulars

As of last check at 2311 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-E73 - "22:02 UT" - 2011 EE51


MPEC 2011-E72 - "20:09 UT" - 2008 GV20


MPEC 2011-E71 - "13:33 UT" - 2011 EL47


MPEC 2011-E70 - "13:26 UT" - 2011 EK47


MPEC 2011-E69 - "13:15 UT" - 2011 EJ47


<< DOU on 12 Mar. '11 >>  MPEC 2011-E68 - "07:09 UT" - Daily Orbit Update

Observers  on 12 March '11

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2011-E69 & 2011-E72 -- 2011 EJ47, 2008 GV20
160Castelmartini Obs. in Italy, 13 in MPEC 2011-E68 -- 2011 CH71, 2009 FY4, 2002 TD60, 2000 EF104, 250614, 22771, 163250, 162463, 152931, 137170, 8566, 4954, 3554
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2011-E68 -- 2011 EE17, 2004 EM20, 48603, 22771, 204232, 175189, 102873, 3554
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2011-E68 -- 2011 EC41
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2011-E68 -- 2008 SO
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2009 WV25
585Kiev Comet Station in the Ukraine, 1 in MPEC 2011-E68 -- 137170
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2011-E69, 2011-E70, 2011-E71 & 2011-E73 -- 2011 EL47, 2011 EK47, 2011 EJ47, 2011 EE51
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2011-E68, 2011-E69, 2011-E70, 2011-E71 & 2011-E73 -- 2011 EL47, 2011 EK47, 2011 EJ47, 2011 EJ, 2011 EE51, 256670, 4487
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2011-E68 -- 2011 CY46, 2011 CH71, 2011 AO52, 2009 FY4, 2004 EK1, 1999 TK12, 250614, 163250
586Pic du Midi Obs. in France, 1 in MPEC 2011-E68 -- 99942
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-E69 -- 2011 EJ47
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-E68 -- 2004 EM20
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2011-E68 -- 2011 EO40, 2011 EL11, 2011 DV, 2011 DU, 2011 DO, 2010 FC6, 2009 RB4, 2009 FT, 152671
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 March '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2311 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. Both also post impact solutions beyond 100 years for a few special 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
2011 EC41JPL Sentry16402037-2107157.0e-09-4.95-5.230JPL: "Analysis based on 23 observations spanning 1.1413 days (2011-Mar-10.27325 to 2011-Mar-11.41452)." Diameter approximately 0.382 km. from mean, weighted H=19.7.
NEODyS16402032-2087368.31e-09-4.85-5.110NEODyS: "Based on 24 optical observations (of which 1 are rejected as outliers) from 2011-03-10.274 to 2011-03-11.415."
2011 EO40JPL Sentry1640R E M O V E DJPL: Risk listing removed at 1151 UTC.
NEODyS1640R E M O V E D-
2011 EL11JPL Sentry16402028-2110599.6e-07-3.48-4.010JPL: "Analysis based on 23 observations spanning 6.9901 days (2011-Mar-04.30394 to 2011-Mar-11.29409)." Diameter approximately 0.350 km. from mean, weighted H=19.9.
NEODyS16402023-2088579.46e-07-3.45-3.950NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2011-03-04.305 to 2011-03-11.295."
2011 DVJPL Sentry16402063-2110447.6e-06-3.39-4.130JPL: "Analysis based on 65 observations spanning 16.944 days (2011-Feb-22.51614 to 2011-Mar-11.45978)." Diameter approximately 0.280 km. from mean, weighted H=20.4.
NEODyS16402088-209061.28e-07-5.08-5.520NEODyS: "Based on 65 optical observations (of which 0 are rejected as outliers) from 2011-02-22.517 to 2011-03-11.461."
2008 EM68JPL Sentry04122011-21109681.5e-05-5.28-5.750JPL: "Analysis based on 12 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183)." Diameter approximately 0.010 km. from mean, weighted H=27.7.

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 12 March '11

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

2206Grabbed MPEC 2011-E73 - 2011 EE51 - see above
2107Grabbed MPEC 2011-E72 - 2008 GV20 - see above
1640Noted that JPL Sentry has updated its 2011 DV risk assessment - see above
Noted that NEODyS has updated its 2011 DV risk assessment - see above
Noted that JPL Sentry has posted 2011 EC41 as an impact risk - see above
Noted that NEODyS has posted 2011 EC41 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 EL11 risk assessment - see above
Noted that NEODyS has updated its 2011 EL11 risk assessment - see above
Noted that JPL Sentry has removed 2011 EO40 as an impact risk - see above
Noted that NEODyS has removed 2011 EO40 as an impact risk - see above
Grabbed MPEC 2011-E68 - Daily Orbit Update - see above
Grabbed MPEC 2011-E69 - 2011 EJ47 - see above
Grabbed MPEC 2011-E70 - 2011 EK47 - see above
Grabbed MPEC 2011-E71 - 2011 EL47 - see above
0412Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
0236Noted Radar Astrometry database update - see above