Contents  on 1 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.

Radar Astrometry  on 1 February '11

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 0238 UTC when the database was dated 31 Jan.

NEOCP Activity  on 1 February '11

The MPC's NEO Confirmation Page has 24 listings: 9 new, 15 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine new and fifteen updated listings. Of these, 21 were "one nighters." So far The Tracking News has counted a total of 26 listings on the NEOCP at some point today.

New MPECs  on 1 February '11

Minor Planet Electronic Circulars

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


MPEC 2011-C02 - "14:56 UT" - 2011 BP40


<< DOU on 1 Feb. '11 >>  MPEC 2011-C01 - "07:08 UT" - Daily Orbit Update

Observers  on 1 February '11

Twelve observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2000 YA
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2011-C01 & 2011-C02 -- 2011 BY18, 2011 BV11, 2011 BP40, 2011 BP24, 2011 BO24, 2011 BN24, 2011 BK24, 2011 BA12, 2011 BA, 2011 AO52, 2011 AA23, 2010 XY82, 2010 XP69, 2010 VY190, 2010 UX6, 2010 RP80, 2010 RN82, 2010 PM58, 36284
621Bergisch Gladbach Obs. in Germany, 1 in MPEC 2011-C01 -- 2011 BJ24
639Dresden Obs. in Germany, 1 in MPEC 2011-C01 -- 18882
H20Eastern Illinois Univ. Obs. in Illinois, 8 in MPEC 2011-C01 -- 2010 WP8, 2010 LR68, 2007 CA27, 2005 GW119, 2003 YS117, 2002 OS4, 2002 AV31, 96590
F65%T. Lister via Faulkes Telescope North in Hawaii, 2 in MPEC 2011-C01 -- 2011 BD40, 2003 HR32
240Herrenberg Obs. in Germany, 2 in MPEC 2011-C01 -- 259221, 18882
704LINEAR in New Mexico, 2 in MPEC 2011-C01 -- 251346, 243025
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-C01 -- 2011 BD40
474Mt. John Obs. in New Zealand, 9 in MPEC 2011-C01 -- 2011 BR15, 2011 BJ24, 2011 BF40, 2011 BF24, 2011 BC40, 2011 BA19, 2010 XK52, 2010 XE25, 2010 RB
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2011-C01 & 2011-C02 -- 2011 BP40, 2010 JH87
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-C01 -- 154300
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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 BH40NEODyS18362036-2089111.58e-08-7.81-8.20NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2011-01-30.424 to 2011-01-30.490."
2011 BF40JPL Sentry18352030-2110771.9e-07-6.28-7.140JPL: "Analysis based on 19 observations spanning 1.1995 days (2011-Jan-30.35537 to 2011-Jan-31.55486)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
NEODyS18352026-2090552.32e-07-6.20-6.720NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2011-01-30.356 to 2011-01-31.556."
2011 BC40NEODyS1835R E M O V E D-
JPL Sentry1835R E M O V E DJPL: Risk listing removed at 1131 UTC.
2011 BO24JPL Sentry18352024-210795.2e-09-5.00-5.300JPL: "Analysis based on 35 observations spanning 2.7773 days (2011-Jan-28.39612 to 2011-Jan-31.173453)." Diameter approximately 0.569 km. from mean, weighted H=18.9.
2011 BN24JPL Sentry18352020-2109982.8e-07-3.97-4.660JPL: "Analysis based on 17 observations spanning 2.9638 days (2011-Jan-28.30613 to 2011-Jan-31.269965)." Diameter approximately 0.277 km. from mean, weighted H=20.4.
NEODyS18352020-2089713.03e-07-3.91-4.640NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2011-01-28.307 to 2011-01-31.271."
2011 BJ24JPL Sentry18352067-210132.5e-09-5.34-5.460JPL: "Analysis based on 58 observations spanning 3.3144 days (2011-Jan-28.1131 to 2011-Jan-31.42755)." Diameter approximately 1.000 km. from mean, weighted H=17.6.
NEODyS1835R E M O V E D-
2011 BA12JPL Sentry18352079-211058.5e-06-4.22-4.340JPL: "Analysis based on 46 observations spanning 6.0854 days (2011-Jan-25.1938 to 2011-Jan-31.279163)." Diameter approximately 0.095 km. from mean, weighted H=22.8.
NEODyS18352079-207915.9e-06-4.34-4.340NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2011-01-25.195 to 2011-01-31.280."
2011 BV11JPL Sentry1835R E M O V E DJPL: Risk listing removed at 1051 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 1 February '11

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

1835Noted 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 BC40 as an impact risk - see above
Noted that NEODyS has removed 2011 BC40 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BF40 risk assessment - see above
Noted that NEODyS has posted 2011 BF40 as an impact risk - see above
Noted that NEODyS 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 NEODyS has removed 2011 BJ24 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BN24 risk assessment - see above
Noted that NEODyS has updated its 2011 BN24 risk assessment - see above
Noted that JPL Sentry has reposted 2011 BO24 as an impact risk - see above
Noted that JPL Sentry has removed 2011 BV11 as an impact risk - see above
Grabbed MPEC 2011-C01 - Daily Orbit Update - see above
Grabbed MPEC 2011-C02 - 2011 BP40 - see above
0238Noted Radar Astrometry database update - see above