Contents  on 7 February '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 February '11

The MPC's NEO Confirmation Page has 31 listings: 11 new, 20 updated

When last checked at 2324 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eleven new and 20 updated listings. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 41 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 February '11

Minor Planet Electronic Circulars

As of last check at 2324 UTC, there have been eight MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-C40 - "17:41 UT" - 2011 CY7


MPEC 2011-C39 - "17:37 UT" - 2011 CX7


MPEC 2011-C38 - "17:31 UT" - 2011 BH59


MPEC 2011-C37 - "17:26 UT" - 2011 BG59


MPEC 2011-C36 - "17:21 UT" - 2011 BF59


MPEC 2011-C35 - "13:03 UT" - 2011 CA7


<< DOU on 7 Feb. '11 >>  MPEC 2011-C34 - "07:09 UT" - Daily Orbit Update


MPEC 2011-C33 - "01:54 UT" - 2011 CZ6

Observers  on 7 February '11

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-C34 -- 2011 AL1
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-C33 -- 2011 CZ6
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2011-C33 & 2011-C34 -- 2011 CZ6, 2011 CV4, 2010 OQ1, 2008 BP16, 2004 CK39, 18882, 159533, 15745
106Crni Vrh Obs. in Slovenia, 2 in MPEC 2011-C34 -- 2008 AH33, 250614
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2011-C34 -- 2011 AF37
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-C34 -- 2011 CV4
F65%T. Lister via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-C34 -- 2011 CQ4
240Herrenberg Obs. in Germany, 4 in MPEC 2011-C34 -- 164400, 137084, 4688, 3122
B19Iluro Obs. in Spain, 9 in MPEC 2011-C34 -- 89830, 36284, 253841, 23183, 162781, 4954, 3554, 1981, 1864
J28Jaen Obs. in Spain, 2 in MPEC 2011-C34 -- 137052, 3122
704LINEAR in New Mexico, 15 in MPECs 2011-C34 & 2011-C40 -- 2011 CY7, 2011 CG2, 2011 BA12, 2011 AG5, 2010 YB, 2000 CR101, 48603, 36284, 243025, 22771, 175706, 162781, 15745, 137125, 3554
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-C36 -- 2011 BF59
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2011-C37 & 2011-C38 -- 2011 BH59, 2011 BG59
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2011-C33, 2011-C34, 2011-C35, 2011-C36, 2011-C39 & 2011-C40 -- 2011 CZ6, 2011 CY7, 2011 CX7, 2011 CA7, 2011 BF59, 2008 BP16
A13Naef Obs. in Switzerland, 5 in MPEC 2011-C34 -- 2011 AF37, 2010 VK188, 175189, 152889, 152680
A24New Millennium Obs. in Italy, 1 in MPEC 2011-C33 -- 2011 CZ6
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2011-C37 & 2011-C38 -- 2011 BH59, 2011 BG59
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2011-C34 -- 48603
204Schiaparelli Obs. in Italy, 2 in MPECs 2011-C33 & 2011-C34 -- 2011 CZ6, 2011 CV4
291Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2011-C34 & 2011-C39 -- 2011 CY3, 2011 CX7, 2011 CN2, 2011 BX18, 2011 BV15, 2011 BT15, 2011 BQ50, 2011 BM45, 2011 BL45, 2011 BJ24, 2011 BB45, 2011 BA45, 2011 BA12, 2011 AH37
926Tenagra II Obs. in Arizona, 6 in MPECs 2011-C33, 2011-C34 & 2011-C39 -- 2011 CZ6, 2011 CX7, 2011 CR4, 2011 CP4, 2008 BP16, 2008 AH33
H10Tzec Maun Obs. Mayhill in New Mexico, 2 in MPEC 2011-C34 -- 2011 CG2, 2011 BA12
C51WISE in Earth polar orbit, 3 in MPEC 2011-C34 -- 2010 KP10, 2010 FD7, 138258
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 February '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2324 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 CX7JPL Sentry20492027-2107663.0e-07-4.73-4.950JPL: "Analysis based on 13 observations spanning 1.7703 days (2011-Feb-05.41405 to 2011-Feb-07.18438)." Diameter approximately 0.174 km. from mean, weighted H=21.4.
2011 CA7JPL Sentry19112012-21104772.1e-05-6.81-7.150JPL: "Analysis based on 11 observations spanning .10661 days (2011-Feb-07.3744 to 2011-Feb-07.48101)." Diameter approximately 0.003 km. from mean, weighted H=30.4.
2011 CT4NEODyS15312014-20901234.25e-07-3.90-4.830NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2011-02-04.458 to 2011-02-06.400."
2011 CR4JPL Sentry1530R E M O V E DJPL: Risk listing removed at 1224 UTC.
2011 CQ4JPL Sentry15302034-2075132.3e-08-4.24-4.890JPL: "Analysis based on 19 observations spanning 4.9266 days (2011-Feb-01.23159 to 2011-Feb-06.15824)." Diameter approximately 0.635 km. from mean, weighted H=18.6.
NEODyS15302034-207591.97e-08-4.23-4.840NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2011-02-01.232 to 2011-02-06.159."
2011 CY3NEODyS15312017-2069185.83e-09-6.34-6.570NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2011-02-05.250 to 2011-02-06.329."
JPL Sentry15302017-2110851.3e-07-5.11-5.360JPL: "Analysis based on 21 observations spanning 1.0791 days (2011-Feb-05.24888 to 2011-Feb-06.32799)." Diameter approximately 0.120 km. from mean, weighted H=22.3.
2011 CN2NEODyS15312017-2090825.69e-08-3.48-3.930NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2011-02-02.509 to 2011-02-06.454."
JPL Sentry15302024-2106222.3e-08-4.10-4.580JPL: "Analysis based on 16 observations spanning 3.9456 days (2011-Feb-02.5079 to 2011-Feb-06.45349)." Diameter approximately 0.676 km. from mean, weighted H=18.5.
2011 BQ50JPL Sentry15302066-210791.1e-05-6.89-7.150JPL: "Analysis based on 17 observations spanning 7.8654 days (2011-Jan-30.4027 to 2011-Feb-07.26808)." Diameter approximately 0.008 km. from mean, weighted H=28.2.
NEODyS15302062-208268.4e-06-6.87-6.990NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2011-01-30.403 to 2011-02-07.269."
2011 BM45JPL Sentry15302078-2108121.3e-05-3.05-3.140JPL: "Analysis based on 17 observations spanning 6.9011 days (2011-Jan-30.4027 to 2011-Feb-06.30382)." Diameter approximately 0.158 km. from mean, weighted H=21.7.
NEODyS15302086-209081.16e-05-2.97-3.050NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2011-01-30.403 to 2011-02-06.305."
2011 BL45JPL Sentry15302050-2074171.0e-04-5.39-5.660JPL: "Analysis based on 9 observations spanning 6.9442 days (2011-Jan-30.34391 to 2011-Feb-06.28815)." Diameter approximately 0.012 km. from mean, weighted H=27.3.
NEODyS15302050-2089243.56e-04-4.57-5.010NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2011-01-30.345 to 2011-02-06.289."
2011 BB45NEODyS1530R E M O V E D-
JPL Sentry1530R E M O V E DJPL: Risk listing removed at 1342 UTC.
2011 BP40JPL Sentry22402011-21095852.5e-05-4.39-5.330JPL: "Analysis based on 6 observations spanning .94379 days (2011-Jan-30.40349 to 2011-Jan-31.347281)." Diameter approximately 0.031 km. from mean, weighted H=25.2.
2011 BJ24JPL Sentry1530210619.2e-10-5.85-5.850JPL: "Analysis based on 78 observations spanning 10.003 days (2011-Jan-28.1131 to 2011-Feb-07.11592)." Diameter approximately 0.990 km. from mean, weighted H=17.7.
2011 BX18NEODyS15312030-207344.52e-09-4.44-4.450NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2011-01-26.311 to 2011-02-07.241."
JPL Sentry15302030-209251.4e-08-4.16-4.270JPL: "Analysis based on 31 observations spanning 11.930 days (2011-Jan-26.31025 to 2011-Feb-07.24011)." Diameter approximately 0.830 km. from mean, weighted H=18.1.
2011 BT15JPL Sentry15302027-2109914.3e-05-3.01-3.350JPL: "Analysis based on 33 observations spanning 13.876 days (2011-Jan-24.28933 to 2011-Feb-07.16492)." Diameter approximately 0.140 km. from mean, weighted H=22.0.
NEODyS15302027-2090782.83e-05-3.02-3.250NEODyS: "Based on 34 optical observations (of which 3 are rejected as outliers) from 2011-01-24.290 to 2011-02-07.166."
2011 BA12JPL Sentry15302079-211051.3e-06-5.02-5.270JPL: "Analysis based on 89 observations spanning 12.272 days (2011-Jan-25.1938 to 2011-Feb-06.46538)." Diameter approximately 0.099 km. from mean, weighted H=22.7.
NEODyS15302079-207916.8e-07-5.23-5.230NEODyS: "Based on 90 optical observations (of which 1 are rejected as outliers) from 2011-01-25.195 to 2011-02-06.466."
2011 AG5JPL Sentry22402036-2057111.6e-04-2.26-2.421JPL: "Analysis based on 93 observations spanning 28.907 days (2011-Jan-08.2673 to 2011-Feb-06.17447)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
NEODyS15302036-2057141.56e-04-2.27-2.431NEODyS: "Based on 93 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-02-06.175."

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 February '11

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

2240Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has posted 2011 BP40 as an impact risk - see above
2049Noted that JPL Sentry has posted 2011 CX7 as an impact risk - see above
1911Noted that JPL Sentry has posted 2011 CA7 as an impact risk - see above
1801Grabbed MPEC 2011-C36 - 2011 BF59 - see above
Grabbed MPEC 2011-C37 - 2011 BG59 - see above
Grabbed MPEC 2011-C38 - 2011 BH59 - see above
Grabbed MPEC 2011-C39 - 2011 CX7 - see above
Grabbed MPEC 2011-C40 - 2011 CY7 - see above
1531Noted that NEODyS has updated its 2011 BX18 risk assessment - see above
Noted that NEODyS has updated its 2011 CN2 risk assessment - see above
Noted that NEODyS has updated its 2011 CY3 risk assessment - see above
1530Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BA12 risk assessment - see above
Noted that NEODyS has updated its 2011 BA12 risk assessment - see above
Noted that JPL Sentry has removed 2011 BB45 as an impact risk - see above
Noted that NEODyS has removed 2011 BB45 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BJ24 risk assessment - see above
Noted that JPL Sentry has posted 2011 BL45 as an impact risk - see above
Noted that NEODyS has updated its 2011 BL45 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BM45 risk assessment - see above
Noted that NEODyS has updated its 2011 BM45 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BQ50 risk assessment - see above
Noted that NEODyS has updated its 2011 BQ50 risk assessment - see above
Noted 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 BX18 risk assessment - see above
Noted that JPL Sentry has updated its 2011 CN2 risk assessment - see above
Noted that JPL Sentry has updated its 2011 CQ4 risk assessment - see above
Noted that NEODyS has updated its 2011 CQ4 risk assessment - see above
Noted that JPL Sentry has removed 2011 CR4 as an impact risk - see above
Noted that NEODyS has posted 2011 CT4 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 CY3 risk assessment - see above
Grabbed MPEC 2011-C34 - Daily Orbit Update - see above
Grabbed MPEC 2011-C35 - 2011 CA7 - see above
0315Grabbed MPEC 2011-C33 - 2011 CZ6 - see above