Contents  on 6 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 6 February '11

The MPC's NEO Confirmation Page has 26 listings: 11 new, 15 updated

When last checked at 2324 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eleven new and fifteen updated listings. Of these, 24 were "one nighters." So far The Tracking News has counted a total of 39 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 6 February '11

Minor Planet Electronic Circulars

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


MPEC 2011-C32 - "22:18 UT" - 2011 CY6


MPEC 2011-C31 - "11:57 UT" - 2011 CV4


MPEC 2011-C30 - "11:51 UT" - 2011 CU4


MPEC 2011-C29 - "11:45 UT" - 2011 CT4


MPEC 2011-C28 - "11:39 UT" - 2011 CS4


<< DOU on 6 Feb. '11 >>  MPEC 2011-C27 - "07:09 UT" - Daily Orbit Update


MPEC 2011-C26 - "06:31 UT" - 2011 CR4


MPEC 2011-C25 - "06:03 UT" - 2011 CQ4


MPEC 2011-C24 - "05:46 UT" - 2011 CP4

Observers  on 6 February '11

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
J97Alginet Obs. in Spain, 1 in MPEC 2011-C27 -- 3122
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2011-C27 -- 2011 BX11, 2011 BV15, 2011 BV10, 2011 BR15, 2011 BF24, 2011 AN16, 2011 AF37, 2011 AA37, 2010 WE9
I99Blanquita Obs. in Spain, 1 in MPEC 2011-C27 -- 36284
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2011-C27, 2011-C31 & 2011-C32 -- 2011 CY6, 2011 CV4, 2011 BV15, 2011 AM24, 2010 YB, 2003 DX10, 2002 AV31, 34613, 256670, 248926, 162421
151Eschenberg Obs. in Switzerland, 2 in MPEC 2011-C27 -- 2011 AM24, 2003 YS117
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2011-C27 & 2011-C32 -- 2011 CY6, 2011 CY3, 2011 CA4
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2011-C27 -- 2011 CG2, 36284, 3122
G92Jarnac Obs. in Arizona, 1 in MPEC 2011-C27 -- 138175
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-C25 -- 2011 CQ4
118Modra Obs. in Slovakia, 1 in MPEC 2011-C32 -- 2011 CY6
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2011-C24, 2011-C26, 2011-C27, 2011-C28, 2011-C29 & 2011-C30 -- 2011 CU4, 2011 CT4, 2011 CS4, 2011 CR4, 2011 CP4, 2011 BA12, 2011 AR26, 2005 GW119
A13Naef Obs. in Switzerland, 1 in MPEC 2011-C27 -- 2010 LR68
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPECs 2011-C24, 2011-C25, 2011-C26, 2011-C27, 2011-C28, 2011-C29 & 2011-C30 -- 2011 CU4, 2011 CT4, 2011 CS4, 2011 CR4, 2011 CQ4, 2011 CP4, 2011 BQ50, 2004 BJ11
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2011-C27 -- 96590, 164400
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-C27 -- 2011 BA
204Schiaparelli Obs. in Italy, 8 in MPEC 2011-C27 -- 2011 BY18, 2011 BR15, 2011 BM24, 2011 BL24, 2006 WE4, 2002 PE130, 2002 AX1, 2000 RJ60
291Spacewatch 1.8m telescope in Arizona, 20 in MPECs 2011-C24, 2011-C25, 2011-C26, 2011-C27, 2011-C28, 2011-C29, 2011-C30 & 2011-C32 -- 2011 CY6, 2011 CU4, 2011 CT4, 2011 CS4, 2011 CR4, 2011 CQ4, 2011 CP4, 2011 CO2, 2011 BX18, 2011 BV15, 2011 BT15, 2011 BQ50, 2011 BM24, 2011 BJ24, 2011 BJ2, 2011 BG40, 2011 BA45, 2011 BA12, 2011 AM12, 2011 AG5
I28Starhoo Obs. in Massachusetts, 1 in MPEC 2011-C27 -- 48603
926Tenagra II Obs. in Arizona, 5 in MPECs 2011-C25, 2011-C28, 2011-C29, 2011-C30 & 2011-C32 -- 2011 CY6, 2011 CU4, 2011 CT4, 2011 CS4, 2011 CQ4
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2011-C27 -- 2011 CQ1
G56Walnut Creek Obs. in northern California, 3 in MPEC 2011-C27 -- 2011 CG2, 2011 AM24, 2007 CA27
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 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 CT4JPL Sentry16532012-21112746.5e-07-3.64-4.290JPL: "Analysis based on 13 observations spanning 1.9412 days (2011-Feb-04.45755 to 2011-Feb-06.39874)." Diameter approximately 0.204 km. from mean, weighted H=21.2.
2011 CR4JPL Sentry1653210913.9e-08-5.98-5.980JPL: "Analysis based on 12 observations spanning 3.7242 days (2011-Feb-02.49952 to 2011-Feb-06.22374)." Diameter approximately 0.200 km. from mean, weighted H=21.2.
2011 CQ4JPL Sentry16532030-2100335.7e-08-3.93-4.720JPL: "Analysis based on 16 observations spanning 4.9266 days (2011-Feb-01.23159 to 2011-Feb-06.15824)." Diameter approximately 0.590 km. from mean, weighted H=18.8.
NEODyS16532011-2075134.53e-08-2.54-2.550NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2011-02-01.232 to 2011-02-06.159."
2011 CZ3NEODyS16542072-208951.44e-07-7.72-7.770NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2011-02-05.220 to 2011-02-05.517."
2011 CY3NEODyS16542017-2090832.6e-06-3.95-4.40NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2011-02-05.250 to 2011-02-05.914."
JPL Sentry16532017-21103604.2e-06-3.83-4.300JPL #2 for the day: "Analysis based on 18 observations spanning .66472 days (2011-Feb-05.24888 to 2011-Feb-05.9136)." Diameter approximately 0.120 km. from mean, weighted H=22.3.
2011 CN2NEODyS16542013-2090833.2e-08-3.73-4.280NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2011-02-02.509 to 2011-02-05.387."
2011 BQ50JPL Sentry16532065-2107109.2e-06-6.97-7.170JPL: "Analysis based on 14 observations spanning 6.8704 days (2011-Jan-30.4027 to 2011-Feb-06.27312)." Diameter approximately 0.008 km. from mean, weighted H=28.2.
NEODyS16532069-208456.57e-06-6.97-6.980NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2011-01-30.403 to 2011-02-06.274."
2011 BJ24JPL Sentry1653210616.5e-10-5.99-5.990JPL: "Analysis based on 75 observations spanning 9.0734 days (2011-Jan-28.1131 to 2011-Feb-06.18647)." Diameter approximately 1.000 km. from mean, weighted H=17.6.
2011 BX18JPL Sentry16532030-209234.9e-08-3.53-3.590JPL: "Analysis based on 29 observations spanning 10.902 days (2011-Jan-26.31025 to 2011-Feb-06.21265)." Diameter approximately 0.840 km. from mean, weighted H=18.0.
NEODyS16532030-207382.68e-08-3.71-3.80NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2011-01-26.311 to 2011-02-06.213."
2011 BT15JPL Sentry16532027-21111117.6e-05-2.88-3.240JPL: "Analysis based on 31 observations spanning 12.872 days (2011-Jan-24.28933 to 2011-Feb-06.16155)." Diameter approximately 0.141 km. from mean, weighted H=21.9.
NEODyS16532027-2090766.07e-05-2.89-3.220NEODyS: "Based on 31 optical observations (of which 1 are rejected as outliers) from 2011-01-24.290 to 2011-02-06.162."
2011 BA12JPL Sentry16532079-211059.3e-06-4.19-4.360JPL: "Analysis based on 76 observations spanning 11.314 days (2011-Jan-25.1938 to 2011-Feb-05.5076)." Diameter approximately 0.095 km. from mean, weighted H=22.8.
NEODyS16532079-207915.7e-06-4.35-4.350NEODyS: "Based on 76 optical observations (of which 0 are rejected as outliers) from 2011-01-25.195 to 2011-02-05.508."
2011 AG5JPL Sentry16532036-2058131.3e-04-2.35-2.540JPL: "Analysis based on 89 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.
NEODyS16532031-2057141.31e-04-2.36-2.550NEODyS: "Based on 89 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 6 February '11

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

2228Grabbed MPEC 2011-C32 - 2011 CY6 - see above
1653Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
Noted 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 reposted 2011 BJ24 as an impact risk - 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 NEODyS has updated its 2011 BX18 risk assessment - see above
Noted that NEODyS has posted 2011 CN2 as an impact risk - see above
Noted that JPL Sentry has posted 2011 CQ4 as an impact risk - see above
Noted that NEODyS has posted 2011 CQ4 as an impact risk - see above
Noted that JPL Sentry has posted 2011 CR4 as an impact risk - see above
Noted that JPL Sentry has posted 2011 CT4 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 CY3 risk assessment - see above
Noted that NEODyS has posted 2011 CY3 as an impact risk - see above
Noted that NEODyS has posted 2011 CZ3 as an impact risk - see above
Grabbed MPEC 2011-C27 - Daily Orbit Update - see above
Grabbed MPEC 2011-C28 - 2011 CS4 - see above
Grabbed MPEC 2011-C29 - 2011 CT4 - see above
Grabbed MPEC 2011-C30 - 2011 CU4 - see above
Grabbed MPEC 2011-C31 - 2011 CV4 - see above
0743Grabbed MPEC 2011-C26 - 2011 CR4 - see above
0622Grabbed MPEC 2011-C24 - 2011 CP4 - see above
Grabbed MPEC 2011-C25 - 2011 CQ4 - see above
0100Noted that JPL Sentry has posted 2011 CY3 as an impact risk - see above