Contents  on 9 February '11

Resources:

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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 9 February '11

The MPC's NEO Confirmation Page has 17 listings: 7 new, 10 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven new and ten updated listings. Of these, thirteen were "one nighters." The Tracking News counted a total of 20 listings on the NEOCP on this day.

New MPECs  on 9 February '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-C62 - "23:58 UT" - 2011 CH33


MPEC 2011-C61 - "23:53 UT" - 2011 CG33


MPEC 2011-C60 - "20:26 UT" - 2009 SK2


MPEC 2011-C59 - "17:35 UT" - 2011 CR1 = 2011 CQ14


MPEC 2011-C58 - "15:24 UT" - 2004 SC60


<< DOU on 9 Feb. '11 >>  MPEC 2011-C57 - "07:10 UT" - Daily Orbit Update

Observers  on 9 February '11

A total of 20 observers appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPECs 2011-C57, 2011-C60, 2011-C61 & 2011-C62 -- 2011 CZ6, 2011 CY7, 2011 CY6, 2011 CP14, 2011 CH33, 2011 CG33, 2011 CG2, 2011 CA7, 2011 CA4, 2011 BN24, 2011 BG59, 2011 BC40, 2011 AS26, 2011 AO52, 2011 AN16, 2009 SK2
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2011-C57 & 2011-C62 -- 2011 CH33, 2004 BE11, 1999 PJ1, 68350, 159609, 11405, 2102
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-C62 -- 2011 CH33
F655David Asher in Northern Ireland via Faulkes Telescope North in Hawaii, 3 in MPEC 2011-C57 -- 2011 BA12, 2009 EN2, 4015
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2011-C62 -- 2011 CH33
203GiaGa Obs. in Italy, 3 in MPEC 2011-C57 -- 2011 CG2, 2011 BA12, 152563
651Grasslands Obs. in Arizona, 1 in MPEC 2011-C62 -- 2011 CH33
J95Great Shefford Obs. in England, 1 in MPEC 2011-C57 -- 2011 CZ3
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2011-C57 -- 2010 XP51
046Klet Obs. in the Czech Republic, 1 in MPEC 2011-C57 -- 2011 BA12
704LINEAR in New Mexico, 12 in MPEC 2011-C57 -- 2011 CZ6, 2011 AM24, 2011 AF37, 2010 WQ7, 2005 EE, 2001 DQ8, 34613, 18882, 163412, 152563, 143381, 4954
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-C61 -- 2011 CG33
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-C57 -- 2011 BQ50
474Mt. John Obs. in New Zealand, 1 in MPEC 2011-C57 -- 2010 AO60
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2011-C57, 2011-C61 & 2011-C62 -- 2011 CH33, 2011 CG33, 12923, 5189
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2011-C58 -- 2004 SC60
291Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2011-C57 & 2011-C61 -- 2011 CY3, 2011 CT4, 2011 CQ4, 2011 CN2, 2011 CG33, 2011 BX18, 2011 BQ50, 2011 BN24, 2011 BM45, 2011 BL45, 2011 BJ24, 2011 BA45, 2011 BA12, 2003 WG
926Tenagra II Obs. in Arizona, 11 in MPEC 2011-C57 -- 2011 CS4, 2011 CO14, 2011 CG2, 2011 BZ18, 2011 BV11, 2011 BU10, 2011 BG40, 2011 BF39, 2011 BD40, 2011 BC40, 2011 BA45
B39Tradate Obs. in Italy, 1 in MPEC 2011-C57 -- 137052
C51WISE in Earth polar orbit, 4 in MPEC 2011-C57 -- 2010 QE2, 2008 YZ32, 1999 TK12, 249886
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 February '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 CF22NEODyS16222022-2090991.48e-05-7.34-8.060NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2011-02-07.377 to 2011-02-07.485."
2011 CC22NEODyS16212022-2090131.15e-07-4.87-4.960NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2011-02-06.262 to 2011-02-08.385."
2011 CA7JPL Sentry16212062-209935.4e-07-8.93-9.150JPL: "Analysis based on 16 observations spanning .94712 days (2011-Feb-07.3744 to 2011-Feb-08.321518)." Diameter approximately 0.003 km. from mean, weighted H=30.3.
NEODyS16212062-207135.21e-07-8.95-9.190NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2011-02-07.375 to 2011-02-08.322."
2011 CT4JPL Sentry16212093-209822.9e-09-6.16-6.190JPL: "Analysis based on 19 observations spanning 3.9278 days (2011-Feb-04.45755 to 2011-Feb-08.38532)." Diameter approximately 0.280 km. from mean, weighted H=20.4.
NEODyS1621R E M O V E D-
2011 CQ4NEODyS16222036-2075109.05e-08-3.62-3.950NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2011-02-01.232 to 2011-02-09.128."
JPL Sentry16212036-207578.1e-08-3.71-4.000JPL: "Analysis based on 25 observations spanning 7.8954 days (2011-Feb-01.23159 to 2011-Feb-09.12698)." Diameter approximately 0.640 km. from mean, weighted H=18.6.
2011 CN2NEODyS16212017-201713.6e-11-6.20-6.20NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2011-02-02.509 to 2011-02-09.200."
JPL Sentry1621R E M O V E DJPL: Risk listing removed at 1220 UTC.
2011 BQ50NEODyS16222078-209048.02e-07-7.92-7.960NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2011-01-30.403 to 2011-02-09.223."
JPL Sentry16212079-210721.2e-06-7.90-8.150JPL: "Analysis based on 22 observations spanning 9.8200 days (2011-Jan-30.4027 to 2011-Feb-09.22273)." Diameter approximately 0.008 km. from mean, weighted H=28.2.
2011 BM45JPL Sentry16212078-2108122.5e-05-2.71-2.750JPL: "Analysis based on 30 observations spanning 9.8081 days (2011-Jan-30.4027 to 2011-Feb-09.21079)." Diameter approximately 0.170 km. from mean, weighted H=21.6.
NEODyS16212086-209082.27e-05-2.67-2.70NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2011-01-30.403 to 2011-02-09.212."
2011 BL45JPL Sentry16212050-2090248.4e-05-5.49-5.620JPL: "Analysis based on 13 observations spanning 8.9716 days (2011-Jan-30.34391 to 2011-Feb-08.31546)." Diameter approximately 0.012 km. from mean, weighted H=27.2.
NEODyS16212050-2090232.94e-04-4.65-5.060NEODyS: "Based on 14 optical observations (of which 1 are rejected as outliers) from 2011-01-30.345 to 2011-02-08.316."
2011 BJ24JPL Sentry1621R E M O V E DJPL: Risk listing removed at 1300 UTC.
2011 BX18JPL Sentry1621R E M O V E DJPL: Risk listing removed at 1050 UTC.
2011 BA12JPL Sentry16212079-211054.0e-07-5.56-6.020JPL: "Analysis based on 111 observations spanning 14.993 days (2011-Jan-25.1938 to 2011-Feb-09.18717)." Diameter approximately 0.099 km. from mean, weighted H=22.7.
NEODyS1621R E M O V E D-
2008 HLNEODyS1621R E M O V E D-

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 9 February '11

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

0028 2/10Grabbed MPEC 2011-C62 - 2011 CH33 - see above
2359Grabbed MPEC 2011-C61 - 2011 CG33 - see above
2101Grabbed MPEC 2011-C60 - 2009 SK2 - see above
1807Grabbed MPEC 2011-C59 - 2011 CR1 = 2011 CQ14 - see above
1621Noted that NEODyS has removed 2008 HL as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BA12 risk assessment - see above
Noted that NEODyS has removed 2011 BA12 as an impact risk - see above
Noted that JPL Sentry has removed 2011 BJ24 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BL45 risk assessment - 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 removed 2011 BX18 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 CA7 risk assessment - see above
Noted that NEODyS has updated its 2011 CA7 risk assessment - see above
Noted that NEODyS has posted 2011 CC22 as an impact risk - see above
Noted that NEODyS has posted 2011 CF22 as an impact risk - see above
Noted that JPL Sentry has removed 2011 CN2 as an impact risk - see above
Noted that NEODyS 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 updated its 2011 CT4 risk assessment - see above
Noted that NEODyS has removed 2011 CT4 as an impact risk - see above
Grabbed MPEC 2011-C57 - Daily Orbit Update - see above
Grabbed MPEC 2011-C58 - 2004 SC60 - see above