Contents  on 7 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.

NEOCP Activity  on 7 March '11

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

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and two updated listings. Of these, two were "one nighters." So far The Tracking News has counted a total of nine listings on the NEOCP 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 7 March '11

Minor Planet Electronic Circulars

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


MPEC 2011-E43 - "17:12 UT" - 2011 EL17


<< DOU on 7 Mar. '11 >>  MPEC 2011-E42 - "07:08 UT" - Daily Orbit Update


MPEC 2011-E41 - "03:11 UT" - 2011 EH17


MPEC 2011-E40 - "03:03 UT" - 2011 EG17


MPEC 2011-E39 - "02:55 UT" - 2011 EF17

Observers  on 7 March '11

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2011-E42 -- 2011 DW, 2011 CY46, 2011 BX10, 2011 BJ24, 2011 AO52
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2011-E40, 2011-E41 & 2011-E42 -- 2011 EH17, 2011 EG17, 2011 AF37, 264308, 136617
I83Cherryvalley Obs. in Ireland, 1 in MPEC 2011-E42 -- 3554
B60Deep Sky Obs. in Germany, 1 in MPEC 2011-E42 -- 2011 AN16
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2011-E42 -- 2011 BE38
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPECs 2011-E39 & 2011-E41 -- 2011 EH17, 2011 EF17
J95Great Shefford Obs. in England, 3 in MPECs 2011-E41, 2011-E42 & 2011-E43 -- 2011 EY11, 2011 EL17, 2011 EH17
A17Guidestar Obs. in Germany, 4 in MPECs 2011-E41 & 2011-E42 -- 2011 EX4, 2011 EH17, 2011 ED12, 2011 DS9
355Hadano Obs. in Japan, 2 in MPEC 2011-E42 -- 2000 EF104, 1999 TK12
B15Inastars Obs. in Germany, 1 in MPEC 2011-E42 -- 2011 EE17
704LINEAR in New Mexico, 9 in MPECs 2011-E42 & 2011-E43 -- 2011 EL17, 2011 BA12, 2008 EZ5, 2005 EY169, 2004 XN50, 2004 EK1, 2000 EY106, 204232, 136617
J131National Schools Obs. via the Liverpool Telescope in the Canary Islands, 5 in MPEC 2011-E42 -- 2007 ML13, 2006 KL21, 2002 NE71, 242191, 241662
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2011-E39, 2011-E40, 2011-E41 & 2011-E42 -- 2011 EY11, 2011 EH17, 2011 EG17, 2011 EF17, 2010 QE2
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2011-E39 & 2011-E42 -- 2011 ET4, 2011 EF17, 2004 BE11, 2003 CA, 2001 RP17, 2000 CR101, 145656
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 3 in MPECs 2011-E40, 2011-E42 & 2011-E43 -- 2011 EL17, 2011 EG17, 2011 BE38
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-E40 -- 2011 EG17
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-E42 -- 2011 DL19
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2011-E40 & 2011-E42 -- 2011 EG17, 2004 EM20, 2001 QP181, 86819, 250706, 22771, 159635
291Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2011-E40 & 2011-E42 -- 2011 EG17, 2011 EC7, 2011 EB, 2011 DV, 2011 DU9, 2011 DU, 2011 DS9, 2011 DS, 2011 CU4, 2011 CT4, 2011 AH37, 2010 LN14, 2002 JQ100
I93St. Pardon de Conques Obs. in France, 4 in MPECs 2011-E40 & 2011-E42 -- 2011 EN11, 2011 EK, 2011 EG17, 2011 DS
D96Tzec Maun Obs. Moorook in South Australia, 1 in MPEC 2011-E42 -- 2011 BE38
C44Volta Obs., 1 in MPEC 2011-E40 -- 2011 EG17
198Wildberg Obs. in Germany, 2 in MPEC 2011-E42 -- 2011 EM11, 2011 DV
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 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 EF17NEODyS17522014-20891002.16e-07-3.04-3.510NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2011-03-05.249 to 2011-03-06.993."
JPL Sentry05502018-21101361.8e-07-3.35-3.920JPL: "Analysis based on 23 observations spanning 1.7444 days (2011-Mar-05.24819 to 2011-Mar-06.99263)." Diameter approximately 0.500 km. from mean, weighted H=19.2.
2011 EC7JPL Sentry1752201313.2e-10-6.74-6.740JPL: "Analysis based on 13 observations spanning 3.0977 days (2011-Mar-03.22331 to 2011-Mar-06.32099)." Diameter approximately 0.120 km. from mean, weighted H=22.2.
NEODyS1752R E M O V E D-
2011 EBJPL Sentry17522070-207732.8e-05-5.62-5.710JPL: "Analysis based on 35 observations spanning 4.9193 days (2011-Mar-01.38036 to 2011-Mar-06.29968)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
NEODyS17522070-207732.72e-05-5.63-5.730NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2011-03-01.381 to 2011-03-06.300."
2011 DU9JPL Sentry17522046-205942.0e-04-4.45-4.450JPL: "Analysis based on 54 observations spanning 7.4335 days (2011-Feb-27.01686 to 2011-Mar-06.45038)." Diameter approximately 0.016 km. from mean, weighted H=26.7.
NEODyS17522043-205451.94e-04-4.45-4.460NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2011-02-27.018 to 2011-03-06.451."
2011 DS9NEODyS17522068-206812.1e-10-7.38-7.380NEODyS: "Based on 95 optical observations (of which 0 are rejected as outliers) from 2011-02-25.929 to 2011-03-06.956."
JPL Sentry1752R E M O V E DJPL: Risk listing removed at 1238 UTC.
2011 DVJPL Sentry17522063-2110421.1e-05-3.18-3.880JPL: "Analysis based on 45 observations spanning 12.003 days (2011-Feb-22.51614 to 2011-Mar-06.51917)." Diameter approximately 0.270 km. from mean, weighted H=20.5.
NEODyS17522063-209082.91e-06-3.66-4.020NEODyS: "Based on 45 optical observations (of which 0 are rejected as outliers) from 2011-02-22.517 to 2011-03-06.520."
2011 DSJPL Sentry17522065-2109181.6e-05-6.08-6.340JPL: "Analysis based on 71 observations spanning 10.962 days (2011-Feb-23.39905 to 2011-Mar-06.36139)." Diameter approximately 0.013 km. from mean, weighted H=27.0.
NEODyS17522065-2088141.3e-05-6.15-6.330NEODyS: "Based on 71 optical observations (of which 0 are rejected as outliers) from 2011-02-23.400 to 2011-03-06.362."

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 7 March '11

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

1752Noted that JPL Sentry has updated its 2011 DS risk assessment - see above
Noted that NEODyS has updated its 2011 DS risk assessment - see above
Noted that JPL Sentry has removed 2011 DS9 as an impact risk - see above
Noted that NEODyS has updated its 2011 DS9 risk assessment - see above
Noted 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 EB risk assessment - see above
Noted that NEODyS has updated its 2011 EB risk assessment - see above
Noted that JPL Sentry has posted 2011 EC7 as an impact risk - see above
Noted that NEODyS has removed 2011 EC7 as an impact risk - see above
Noted that NEODyS has posted 2011 EF17 as an impact risk - see above
Grabbed MPEC 2011-E42 - Daily Orbit Update - see above
Grabbed MPEC 2011-E43 - 2011 EL17 - see above
0550Noted that JPL Sentry has posted 2011 EF17 as an impact risk - see above
0341Grabbed MPEC 2011-E41 - 2011 EH17 - see above
0312Grabbed MPEC 2011-E39 - 2011 EF17 - see above
Grabbed MPEC 2011-E40 - 2011 EG17 - see above