Contents  on 31 January '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 31 January '11

The MPC's NEO Confirmation Page has 20 listings: 17 new, 3 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seventeen new and three updated listings. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 28 listings on the NEOCP at some point 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 31 January '11

Minor Planet Electronic Circulars

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


MPEC 2011-B77 - "21:26 UT" - 2011 BO40


MPEC 2011-B76 - "13:07 UT" - 2011 BH40


MPEC 2011-B75 - "12:42 UT" - 2011 BG40


MPEC 2011-B74 - "12:28 UT" - 2011 BF40


MPEC 2011-B73 - "09:36 UT" - 2011 BD40


<< DOU on 31 Jan. '11 >>  MPEC 2011-B72 - "07:09 UT" - Daily Orbit Update


MPEC 2011-B71 - "04:50 UT" - 2011 BC40

Observers  on 31 January '11

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
B54Ager Obs. in Spain, 1 in MPEC 2011-B72 -- 3122
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2011-B72 -- 18882
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2011-B72, 2011-B73, 2011-B74, 2011-B75 & 2011-B77 -- 2011 BO40, 2011 BJ24, 2011 BH39, 2011 BG40, 2011 BF40, 2011 BD40, 2011 AM24
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-B73 -- 2011 BD40
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2011-B71 & 2011-B72 -- 2011 BC40, 2008 FT6, 2007 EJ, 2004 CK39, 2004 BW58, 2003 MC7, 99935, 40267, 253841, 7480, 3122
651Grasslands Obs. in Arizona, 1 in MPEC 2011-B71 -- 2011 BC40
J95Great Shefford Obs. in England, 2 in MPECs 2011-B71 & 2011-B73 -- 2011 BD40, 2011 BC40
704LINEAR in New Mexico, 18 in MPEC 2011-B72 -- 2011 BF39, 2010 YB, 2010 XZ67, 2010 LF86, 2005 GW119, 2004 YZ23, 2003 MC7, 85990, 48603, 263976, 22771, 13651, 12923, 7480, 4660, 4401, 3838, 2212
844Los Molinos Obs. in Uruguay, 1 in MPEC 2011-B72 -- 2011 AM24
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2011-B71, 2011-B72, 2011-B73, 2011-B74 & 2011-B76 -- 2011 BH40, 2011 BG10, 2011 BF40, 2011 BD40, 2011 BC40, 2010 UE51, 2010 QE2
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2011-B72 -- 2010 OQ1, 2010 LR68, 2000 CR101
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2011-B71, 2011-B72, 2011-B74 & 2011-B76 -- 2011 BH40, 2011 BF40, 2011 BC40, 2006 CG, 53550
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2011-B72, 2011-B73, 2011-B75 & 2011-B77 -- 2011 BW18, 2011 BO40, 2011 BG40, 2011 BD40, 2006 SP134
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 3 in MPEC 2011-B72 -- 2005 EE, 2001 DQ8, 36284
204Schiaparelli Obs. in Italy, 10 in MPEC 2011-B72 -- 2011 BV10, 2011 BB, 2011 AG5, 2010 WH, 2010 TH19, 2007 CA27, 2007 AA9, 2005 EE, 2002 BN, 1999 XR35
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-B72 -- 15745
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2011-B72 -- 2010 LR68, 2010 KY127, 2008 UN90
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 January '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 BH40JPL Sentry16142022-2110571.8e-07-6.72-7.260JPL: "Analysis based on 12 observations spanning .06577 days (2011-Jan-30.42363 to 2011-Jan-30.4894)." Diameter approximately 0.034 km. from mean, weighted H=25.0.
2011 BG40JPL Sentry16142017-2047122.5e-09-7.93-8.310JPL: "Analysis based on 6 observations spanning .94358 days (2011-Jan-30.40492 to 2011-Jan-31.348503)." Diameter approximately 0.049 km. from mean, weighted H=24.2.
2011 BF40JPL Sentry16142035-208534.0e-10-9.03-9.380JPL: "Analysis based on 14 observations spanning .06708 days (2011-Jan-30.35537 to 2011-Jan-30.42245)." Diameter approximately 0.046 km. from mean, weighted H=24.4.
2011 BC40NEODyS16142026-2074108.89e-09-5.30-5.480NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2011-01-30.201 to 2011-01-31.158."
JPL Sentry07112026-2107171.9e-08-5.00-5.270JPL: "Analysis based on 17 observations spanning .95685 days (2011-Jan-30.20006 to 2011-Jan-31.15691)." Diameter approximately 0.341 km. from mean, weighted H=20.0.
2011 BH39NEODyS16152016-20901804.94e-07-6.00-6.570NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2011-01-30.224 to 2011-01-30.384."
JPL Sentry16142014-21101956.8e-07-5.92-6.530JPL: "Analysis based on 21 observations spanning .16019 days (2011-Jan-30.22278 to 2011-Jan-30.38297)." Diameter approximately 0.028 km. from mean, weighted H=25.4.
2011 BF39NEODyS1614R E M O V E D-
JPL Sentry1614R E M O V E DJPL: Risk listing removed at 1050 UTC.
2011 BJ24NEODyS16152043-208282.92e-09-4.90-5.30NEODyS: "Based on 51 optical observations (of which 0 are rejected as outliers) from 2011-01-28.114 to 2011-01-29.421."
JPL Sentry16142043-210164.3e-09-4.99-5.430JPL: "Analysis based on 51 observations spanning 1.3070 days (2011-Jan-28.1131 to 2011-Jan-29.42014)." Diameter approximately 0.985 km. from mean, weighted H=17.7.
2011 BW18NEODyS1614R E M O V E D-
JPL Sentry1614R E M O V E DJPL: Risk listing removed at 1129 UTC.
2011 BG10NEODyS16152051-207444.56e-06-5.87-6.120NEODyS: "Based on 39 optical observations (of which 1 are rejected as outliers) from 2011-01-23.270 to 2011-01-30.521."
JPL Sentry16142051-207441.6e-06-6.32-6.570JPL: "Analysis based on 39 observations spanning 7.2507 days (2011-Jan-23.26948 to 2011-Jan-30.52016)." Diameter approximately 0.019 km. from mean, weighted H=26.3.
2011 AG5JPL Sentry16142036-205788.0e-05-2.58-2.760JPL: "Analysis based on 81 observations spanning 21.567 days (2011-Jan-08.2673 to 2011-Jan-29.83405)." Diameter approximately 0.140 km. from mean, weighted H=22.0.
NEODyS16142036-2057107.89e-05-2.59-2.770NEODyS: "Based on 81 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-01-29.835."
2010 UE51JPL Sentry1614R E M O V E DJPL: Risk listing removed at 1143 UTC.

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 31 January '11

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

2210Grabbed MPEC 2011-B77 - 2011 BO40 - see above
1615Noted that NEODyS has updated its 2011 BG10 risk assessment - see above
Noted that NEODyS has updated its 2011 BJ24 risk assessment - see above
1614Noted that JPL Sentry has removed 2010 UE51 as an impact risk - see above
Noted 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 NEODyS has posted 2011 BC40 as an impact risk - see above
Noted that JPL Sentry has removed 2011 BF39 as an impact risk - see above
Noted that NEODyS has removed 2011 BF39 as an impact risk - see above
Noted that JPL Sentry has posted 2011 BF40 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BG10 risk assessment - see above
Noted that JPL Sentry has posted 2011 BG40 as an impact risk - see above
Noted that JPL Sentry has posted 2011 BH39 as an impact risk - see above
Noted that NEODyS has posted 2011 BH39 as an impact risk - see above
Noted that JPL Sentry has posted 2011 BH40 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BJ24 risk assessment - see above
Noted that JPL Sentry has removed 2011 BW18 as an impact risk - see above
Noted that NEODyS has removed 2011 BW18 as an impact risk - see above
Grabbed MPEC 2011-B72 - Daily Orbit Update - see above
Grabbed MPEC 2011-B73 - 2011 BD40 - see above
Grabbed MPEC 2011-B74 - 2011 BF40 - see above
Grabbed MPEC 2011-B75 - 2011 BG40 - see above
Grabbed MPEC 2011-B76 - 2011 BH40 - see above
0711Noted that JPL Sentry has posted 2011 BC40 as an impact risk - see above
0457Grabbed MPEC 2011-B71 - 2011 BC40 - see above