Contents  on 13 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 13 March '11

Radar observation of three objects

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


Data update noted at 1712 UTC when the database was dated 13 March

NEOCP Activity  on 13 March '11

The MPC's NEO Confirmation Page has 6 listings: 3 new, 3 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three new and three 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 13 March '11

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-E79 - "20:56 UT" - 2011 EP51


MPEC 2011-E78 - "20:35 UT" - 2011 EO51


MPEC 2011-E77 - "20:29 UT" - 2011 EN51


MPEC 2011-E76 - "11:02 UT" - 2011 EM51


MPEC 2011-E75 - "10:33 UT" - 2011 EL51


<< DOU on 13 Mar. '11 >>  MPEC 2011-E74 - "07:12 UT" - Daily Orbit Update

Observers  on 13 March '11

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 2 in radar -- 65909, 194126
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2011-E74, 2011-E75, 2011-E77 & 2011-E78 -- 2011 EV29, 2011 EU29, 2011 EU20, 2011 ET4, 2011 EO51, 2011 EN51, 2011 EM40, 2011 EL51, 2011 EG17, 2011 EE17, 2011 ED12, 2011 EB12, 2011 DV, 2011 DU9, 2011 DD5, 2011 CG2, 2011 BX10, 2011 BB45, 2011 AN16
160Castelmartini Obs. in Italy, 2 in MPEC 2011-E74 -- 2011 CY46, 23183
703Catalina Sky Survey in Arizona, 1 in MPEC 2011-E74 -- 2011 CH71
A27Eridanus Obs. in Germany, 1 in MPEC 2011-E74 -- 2011 BO59
252Goldstone DSS-13 34m antenna in southern California, 1 in radar -- 4179
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 4179
651Grasslands Obs. in Arizona, 1 in MPEC 2011-E75 -- 2011 EL51
J95Great Shefford Obs. in England, 3 in MPECs 2011-E74, 2011-E77 & 2011-E79 -- 2011 EP51, 2011 EN51, 2011 EE51
704LINEAR in New Mexico, 7 in MPECs 2011-E74, 2011-E77 & 2011-E78 -- 2011 EO51, 2011 EN51, 2011 ED12, 2011 EC41, 2011 BO59, 2009 FY4, 154035
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-E75 -- 2011 EL51
900Moriyama Obs. in Japan, 1 in MPEC 2011-E78 -- 2011 EO51
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2011-E74, 2011-E75, 2011-E77 & 2011-E79 -- 2011 EP51, 2011 EN51, 2011 EL51, 2005 ES70, 7480, 4401
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2011-E74 -- 2002 PX39
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2011-E74 -- 2002 PX39
A24New Millennium Obs. in Italy, 18 in MPEC 2011-E74 -- 2009 DV42, 2005 GW119, 2001 DQ8, 2000 CR101, 96590, 89830, 36284, 23183, 21374, 18882, 175706, 152563, 137084, 111253, 5496, 4954, 3122, 1864
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2011-E74 -- 2011 DS9, 2011 CH71, 2011 BE38, 2004 EM20, 4954
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPECs 2011-E74 & 2011-E75 -- 2011 EZ40, 2011 EL51
H36Sandlot Obs. in Kansas, 4 in MPECs 2011-E74 & 2011-E76 -- 2011 EV29, 2011 EN40, 2011 EM51, 2011 ED12
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-E76 -- 2011 EM51
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2011-E74, 2011-E75, 2011-E76 & 2011-E77 -- 2011 EU29, 2011 EN51, 2011 EM51, 2011 EL51
C42Xingming Obs. in China, 1 in MPEC 2011-E78 -- 2011 EO51
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 March '11

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. 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 EM51JPL Sentry17112018-2088511.6e-08-5.85-6.620JPL: "Analysis based on 15 observations spanning 3.0093 days (2011-Mar-10.43456 to 2011-Mar-13.4439)." Diameter approximately 0.171 km. from mean, weighted H=21.5.
2011 EC41JPL Sentry17112037-2107105.7e-09-4.97-5.210JPL: "Analysis based on 27 observations spanning 1.1413 days (2011-Mar-10.27325 to 2011-Mar-11.41452)." Diameter approximately 0.402 km. from mean, weighted H=19.6.
NEODyS17112032-2089339.22e-09-4.76-5.030NEODyS: "Based on 28 optical observations (of which 1 are rejected as outliers) from 2011-03-10.274 to 2011-03-11.415."
2011 EM40JPL Sentry17112045-2110421.4e-05-6.37-6.550JPL: "Analysis based on 12 observations spanning .88529 days (2011-Mar-10.37855 to 2011-Mar-11.26384)." Diameter approximately 0.010 km. from mean, weighted H=27.8.
NEODyS17112052-2088242.48e-05-6.11-6.470NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2011-03-10.379 to 2011-03-11.265."
2011 EU29JPL Sentry17112029-211049.0e-07-3.64-3.650JPL: "Analysis based on 60 observations spanning 4.9208 days (2011-Mar-08.20041 to 2011-Mar-13.12124)." Diameter approximately 0.380 km. from mean, weighted H=19.8.
NEODyS17112029-206723.8e-10-6.61-6.860NEODyS: "Based on 60 optical observations (of which 0 are rejected as outliers) from 2011-03-08.201 to 2011-03-13.122."
2011 DU9JPL Sentry17112043-205951.9e-04-4.46-4.470JPL: "Analysis based on 64 observations spanning 12.375 days (2011-Feb-27.01686 to 2011-Mar-11.391399)." Diameter approximately 0.016 km. from mean, weighted H=26.7.
NEODyS17112043-205441.94e-04-4.46-4.470NEODyS: "Based on 64 optical observations (of which 0 are rejected as outliers) from 2011-02-27.018 to 2011-03-11.392."
2011 DVJPL Sentry17112075-2110397.2e-06-3.42-4.080JPL: "Analysis based on 68 observations spanning 16.944 days (2011-Feb-22.51614 to 2011-Mar-11.45978)." Diameter approximately 0.270 km. from mean, weighted H=20.5.
NEODyS17112087-209061.2e-07-5.11-5.50NEODyS: "Based on 68 optical observations (of which 0 are rejected as outliers) from 2011-02-22.517 to 2011-03-11.461."

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 13 March '11

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

2200Grabbed MPEC 2011-E79 - 2011 EP51 - see above
2100Grabbed MPEC 2011-E77 - 2011 EN51 - see above
Grabbed MPEC 2011-E78 - 2011 EO51 - see above
1712Noted Radar Astrometry database update - see above
1711Noted that JPL Sentry has updated its 2011 DU9 risk assessment - see above
Noted that NEODyS has updated its 2011 DU9 risk assessment - see above
Noted 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 updated its 2011 EC41 risk assessment - see above
Noted that NEODyS has updated its 2011 EC41 risk assessment - see above
Noted that JPL Sentry has updated its 2011 EM40 risk assessment - see above
Noted that NEODyS has updated its 2011 EM40 risk assessment - see above
Noted that JPL Sentry has posted 2011 EM51 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 EU29 risk assessment - see above
Noted that NEODyS has updated its 2011 EU29 risk assessment - see above
Grabbed MPEC 2011-E74 - Daily Orbit Update - see above
Grabbed MPEC 2011-E75 - 2011 EL51 - see above
Grabbed MPEC 2011-E76 - 2011 EM51 - see above