Contents  on 15 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 15 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 1331 UTC when the database was dated 14 March

NEOCP Activity  on 15 March '11

The MPC's NEO Confirmation Page has 5 listings: 3 new, 2 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three new and two updated listings. All of these were "one nighters." The Tracking News counted a total of fourteen listings on the NEOCP on this day.

New MPECs  on 15 March '11

Minor Planet Electronic Circulars

There were six MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-E90 - "21:49 UT" - 2011 EW74


MPEC 2011-E89 - "19:19 UT" - 2011 ET74


MPEC 2011-E88 - "19:13 UT" - 2011 ES74


MPEC 2011-E87 - "19:06 UT" - 2011 ER74


MPEC 2011-E86 - "12:26 UT" - 2011 EB74


<< DOU on 15 Mar. '11 >>  MPEC 2011-E85 - "07:09 UT" - Daily Orbit Update

Observers  on 15 March '11

Nineteen observers appeared in this day's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2011-E90 -- 2011 EW74
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2011-E85 -- 2011 EW29, 2011 EV29, 2011 ET29, 2011 EM40, 2011 EM11, 2011 EK40, 2011 ED12, 2011 CH50, 2010 UX7
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-E90 -- 2011 EW74
160Castelmartini Obs. in Italy, 8 in MPEC 2011-E85 -- 2011 ET4, 2011 CY46, 2011 BO59, 2009 FY4, 2009 DV42, 2002 TD60, 265196, 3122
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2011-E85, 2011-E86, 2011-E87 & 2011-E90 -- 2011 EW74, 2011 ER74, 2011 EB74, 2011 DS9, 2008 FT6, 2002 TD60, 99935, 85990, 40267, 215167, 163412, 7480
807{program code "{" (31) via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-E85 -- 2003 FC5
J18Churchstoke Obs. in Wales, 1 in MPEC 2011-E85 -- 2011 EO51
252Goldstone DSS-13 34m antenna in southern California, 1 in radar -- 4179
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 4179
704LINEAR in New Mexico, 8 in MPEC 2011-E85 -- 2004 FG1, 2003 FC5, 2000 EY106, 256670, 24445, 162781, 3199, 1916
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-E85 -- 2011 EK40
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2011-E85, 2011-E86, 2011-E87, 2011-E88 & 2011-E90 -- 2011 EW74, 2011 ES74, 2011 ER74, 2011 EM40, 2011 EK40, 2011 EG17, 2011 EB74, 2011 BA12, 2001 RP17, 85990, 5836
A24New Millennium Obs. in Italy, 2 in MPEC 2011-E85 -- 21374, 3122
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2011-E85 -- 3554
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2011-E85 & 2011-E89 -- 2011 ET74, 2009 EN2
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-E85 -- 108519
510Siegen Obs. in Germany, 1 in MPEC 2011-E90 -- 2011 EW74
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2011-E85 -- 2011 EM51, 2006 RA55, 2005 GP21, 1999 TK12, 250706
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2011-E85 & 2011-E89 -- 2011 EZ40, 2011 ET74, 2011 EM51, 2011 EM40, 2011 EL40, 2011 EB7, 2011 DY4, 2011 DV, 2010 FC6, 2009 SM, 2008 RJ1, 2008 EZ5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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 ET74JPL Sentry22062083-209724.9e-10-10.67-10.80JPL: "Analysis based on 7 observations spanning 1.0043 days (2011-Mar-14.3652 to 2011-Mar-15.36952)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
2011 EB74JPL Sentry14262032-20771872.9e-04-4.58-5.510JPL: "Analysis based on 17 observations spanning .09906 days (2011-Mar-15.40337 to 2011-Mar-15.50243)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
2011 EV73JPL Sentry0021210811.8e-10-11.85-11.90JPL: "Analysis based on 9 observations spanning 1.0891 days (2011-Mar-13.39452 to 2011-Mar-14.48358)." Diameter approximately 0.007 km. from mean, weighted H=28.4.
2011 EM40JPL Sentry13302060-2110161.0e-06-7.62-8.340JPL: "Analysis based on 25 observations spanning 3.9087 days (2011-Mar-10.37855 to 2011-Mar-14.28722)." Diameter approximately 0.009 km. from mean, weighted H=28.0.
NEODyS13302054-2089155.28e-07-7.75-8.090NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2011-03-10.379 to 2011-03-14.288."
2011 EL40JPL Sentry1330207311.2e-07-7.56-7.560JPL: "Analysis based on 30 observations spanning 4.1374 days (2011-Mar-10.24148 to 2011-Mar-14.37887)." Diameter approximately 0.017 km. from mean, weighted H=26.5.
NEODyS1330R E M O V E D-
2011 EK40JPL Sentry1330R E M O V E DJPL: Risk listing removed at 1140 UTC.
NEODyS1330R E M O V E D-
2011 DVJPL Sentry13302090-2110276.4e-06-3.49-3.960JPL: "Analysis based on 74 observations spanning 19.966 days (2011-Feb-22.51614 to 2011-Mar-14.4818)." Diameter approximately 0.270 km. from mean, weighted H=20.5.
NEODyS13302084-209024.66e-09-6.54-6.570NEODyS: "Based on 74 optical observations (of which 0 are rejected as outliers) from 2011-02-22.517 to 2011-03-14.483."

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 15 March '11

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

2206Noted that JPL Sentry has posted 2011 ET74 as an impact risk - see above
Grabbed MPEC 2011-E90 - 2011 EW74 - see above
2000Grabbed MPEC 2011-E87 - 2011 ER74 - see above
Grabbed MPEC 2011-E88 - 2011 ES74 - see above
Grabbed MPEC 2011-E89 - 2011 ET74 - see above
1426Noted that JPL Sentry has posted 2011 EB74 as an impact risk - see above
1331Noted Radar Astrometry database update - see above
1330Noted 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 removed 2011 EK40 as an impact risk - see above
Noted that NEODyS has removed 2011 EK40 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 EL40 risk assessment - see above
Noted that NEODyS has removed 2011 EL40 as an impact risk - 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
Grabbed MPEC 2011-E85 - Daily Orbit Update - see above
Grabbed MPEC 2011-E86 - 2011 EB74 - see above
0021Noted that JPL Sentry has posted 2011 EV73 as an impact risk - see above