Contents  on 1 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 1 March '11

The MPC's NEO Confirmation Page has 9 listings: 4 new, 5 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four new and five updated listings. All of these were "one nighters." So far The Tracking News has counted a total of twelve 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 1 March '11

Minor Planet Electronic Circulars

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


MPEC 2011-E03 - "22:13 UT" - 2011 DL19


MPEC 2011-E02 - "11:12 UT" - 2011 DV10


<< DOU on 1 Mar. '11 >>  MPEC 2011-E01 - "07:07 UT" - Daily Orbit Update

Observers  on 1 March '11

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
A50Andrushivka Obs. in the Ukraine, 1 in MPEC 2011-E01 -- 159467
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-E03 -- 2011 DL19
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-E01 -- 2011 DS9
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2011-E01 -- 2011 CH71
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 4 in MPECs 2011-E01 & 2011-E03 -- 2011 DU9, 2011 DL19, 2011 DE5, 2011 DD5
J28Jaen Obs. in Spain, 1 in MPEC 2011-E01 -- 89830
704LINEAR in New Mexico, 3 in MPEC 2011-E01 -- 2011 BO59, 215167, 11405
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2011-E01 & 2011-E02 -- 2011 DV10, 2011 BT15
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-E01 -- 2011 BH59
711McDonald Obs. in Texas, 1 in MPEC 2011-E03 -- 2011 DL19
118Modra Obs. in Slovakia, 1 in MPEC 2011-E01 -- 2010 VX39
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2011-E02 -- 2011 DV10
J69North Obs. in England, 1 in MPEC 2011-E01 -- 2011 DT9
204Schiaparelli Obs. in Italy, 16 in MPEC 2011-E01 -- 2011 DS, 2011 DR, 2011 DQ, 2011 DO, 2011 CH71, 2011 CG71, 2011 CG2, 2010 WQ7, 2007 EJ, 2006 CJ, 2004 EM20, 2004 CK39, 2000 EF104, 1999 XR35, 265482, 264308
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-E03 -- 2011 DL19
C51WISE in Earth polar orbit, 1 in MPEC 2011-E01 -- 263976
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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 DV10JPL Sentry17572034-2109304.3e-08-7.35-7.950JPL: "Analysis based on 11 observations spanning 3.0806 days (2011-Feb-26.30148 to 2011-Mar-01.38207)." Diameter approximately 0.037 km. from mean, weighted H=24.8.
2011 DU9JPL Sentry17572030-205951.9e-04-4.44-4.450JPL: "Analysis based on 24 observations spanning 1.3403 days (2011-Feb-27.01686 to 2011-Feb-28.35719)." Diameter approximately 0.016 km. from mean, weighted H=26.6.
NEODyS17572041-205961.74e-04-4.47-4.480NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2011-02-27.018 to 2011-02-28.358."
2011 DS9JPL Sentry17572015-21091142.7e-06-2.99-3.610JPL: "Analysis based on 29 observations spanning 2.9687 days (2011-Feb-25.92799 to 2011-Feb-28.89672)." Diameter approximately 0.326 km. from mean, weighted H=20.1.
NEODyS17572015-2088562.77e-06-3.01-3.610NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2011-02-25.929 to 2011-02-28.897."
2011 DE5JPL Sentry17572018-203525.4e-07-6.01-6.010JPL: "Analysis based on 28 observations spanning 3.0090 days (2011-Feb-25.33918 to 2011-Feb-28.34815)." Diameter approximately 0.018 km. from mean, weighted H=26.4.
NEODyS1757R E M O V E D-
2011 DSJPL Sentry17572067-2108171.9e-05-6.03-6.270JPL: "Analysis based on 35 observations spanning 4.0801 days (2011-Feb-23.39905 to 2011-Feb-27.47917)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
NEODyS17572065-2083111.37e-05-6.15-6.280NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2011-02-23.400 to 2011-02-27.480."
2011 BT15JPL Sentry17572037-21091209.1e-05-2.81-3.480JPL: "Analysis based on 57 observations spanning 35.972 days (2011-Jan-24.28933 to 2011-Mar-01.26104)." Diameter approximately 0.150 km. from mean, weighted H=21.8.
NEODyS17572037-2090914.15e-05-3.10-3.520NEODyS: "Based on 58 optical observations (of which 3 are rejected as outliers) from 2011-01-24.290 to 2011-03-01.262."

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 1 March '11

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

2220Grabbed MPEC 2011-E03 - 2011 DL19 - see above
1757Noted that JPL Sentry has updated its 2011 BT15 risk assessment - see above
Noted that NEODyS has updated its 2011 BT15 risk assessment - see above
Noted that JPL Sentry has updated its 2011 DE5 risk assessment - see above
Noted that NEODyS has removed 2011 DE5 as an impact risk - see above
Noted 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 updated its 2011 DS9 risk assessment - 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 posted 2011 DV10 as an impact risk - see above
Grabbed MPEC 2011-E01 - Daily Orbit Update - see above
Grabbed MPEC 2011-E02 - 2011 DV10 - see above