Contents  on 2 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 2 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 2125 UTC when the database was dated 2 Feb.

NEOCP Activity  on 2 February '11

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

When last checked at 2130 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine new and fifteen updated listings. Of these, 23 were "one nighters." So far The Tracking News has counted a total of 31 listings on the NEOCP at some point today.

New MPECs  on 2 February '11

Minor Planet Electronic Circulars

As of last check at 2139 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-C06 - "17:44 UT" - 2011 BB45


MPEC 2011-C05 - "17:39 UT" - 2011 BA45


MPEC 2011-C04 - "17:34 UT" - 2011 BZ44


<< DOU on 2 Feb. '11 >>  MPEC 2011-C03 - "07:09 UT" - Daily Orbit Update

Observers  on 2 February '11

Eleven observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 8567
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2011-C03 -- 2011 BY11, 2011 BX10, 2011 BJ39, 2011 BJ24, 2011 BA12, 2011 BA, 2011 AO52, 2011 AA23, 2010 XK52, 36284
432Boambee Obs. in New South Wales, 3 in MPEC 2011-C03 -- 2003 OU, 2000 AZ93, 248083
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 2 in MPECs 2011-C05 & 2011-C06 -- 2011 BB45, 2011 BA45
F65%T. Lister via Faulkes Telescope North in Hawaii, 3 in MPECs 2011-C04, 2011-C05 & 2011-C06 -- 2011 BZ44, 2011 BB45, 2011 BA45
F659Marco Micheli in Hawaii via Faulkes Telescope North in Hawaii, 2 in MPEC 2011-C03 -- 2010 XR45, 2010 XD11
046Klet Obs. in the Czech Republic, 2 in MPEC 2011-C03 -- 2011 BX10, 2011 BA12
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-C04 -- 2011 BZ44
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2011-C03 & 2011-C04 -- 2011 BZ44, 2011 BT15
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2011-C03, 2011-C04, 2011-C05 & 2011-C06 -- 2011 BZ44, 2011 BB45, 2011 BA45, 2011 AL52
204Schiaparelli Obs. in Italy, 2 in MPECs 2011-C05 & 2011-C06 -- 2011 BB45, 2011 BA45
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2011-C03 & 2011-C04 -- 2011 BZ44, 2011 BJ24, 2011 BG40, 2011 BA12, 2011 AH37, 2011 AG5, 2010 XW58, 2004 GY, 1998 KH9
G56Walnut Creek Obs. in northern California, 1 in MPEC 2011-C03 -- 2011 BA12
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 February '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2140 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 BB45JPL Sentry20022023-2109412.2e-07-3.45-3.620JPL: "Analysis based on 11 observations spanning 3.2643 days (2011-Jan-30.34723 to 2011-Feb-02.61158)." Diameter approximately 0.518 km. from mean, weighted H=19.1.
2011 BP40NEODyS16412013-2085804.01e-06-4.97-5.750NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2011-01-30.404 to 2011-01-31.348."
2011 BG40JPL Sentry1641R E M O V E DJPL: Risk listing removed at 1140 UTC.
2011 BJ24JPL Sentry16412053-206724.0e-10-5.79-5.940JPL: "Analysis based on 65 observations spanning 5.0698 days (2011-Jan-28.1131 to 2011-Feb-02.18288)." Diameter approximately 1.000 km. from mean, weighted H=17.6.
2011 BT15JPL Sentry16412027-2087604.5e-05-2.81-3.250JPL: "Analysis based on 25 observations spanning 6.9588 days (2011-Jan-24.28933 to 2011-Jan-31.248131)." Diameter approximately 0.142 km. from mean, weighted H=21.9.
NEODyS16412027-2090805.86e-05-2.64-3.00NEODyS: "Based on 25 optical observations (of which 1 are rejected as outliers) from 2011-01-24.290 to 2011-01-31.249."
2011 BA12JPL Sentry16412079-211051.4e-05-4.01-4.130JPL: "Analysis based on 61 observations spanning 8.0688 days (2011-Jan-25.1938 to 2011-Feb-02.26257)." Diameter approximately 0.094 km. from mean, weighted H=22.8.
NEODyS16412079-207919.6e-06-4.13-4.130NEODyS: "Based on 61 optical observations (of which 0 are rejected as outliers) from 2011-01-25.195 to 2011-02-02.263."
2011 BX10JPL Sentry1641210812.4e-10-6.77-6.770JPL: "Analysis based on 60 observations spanning 8.6763 days (2011-Jan-24.13405 to 2011-Feb-01.81035)." Diameter approximately 0.720 km. from mean, weighted H=18.4.
2011 AG5JPL Sentry16412036-2057111.1e-04-2.45-2.610JPL: "Analysis based on 84 observations spanning 24.900 days (2011-Jan-08.2673 to 2011-Feb-02.16751)." Diameter approximately 0.140 km. from mean, weighted H=22.0.
NEODyS16412031-2057131.06e-04-2.46-2.620NEODyS: "Based on 84 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-02-02.168."
2010 XW58JPL Sentry16412069-2106103.9e-06-5.62-5.970JPL: "Analysis based on 65 observations spanning 52.784 days (2010-Dec-11.47391 to 2011-Feb-02.2579)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
NEODyS16412069-208161.07e-06-6.08-6.280NEODyS: "Based on 66 optical observations (of which 1 are rejected as outliers) from 2010-12-11.475 to 2011-02-02.259."

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 2 February '11

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

2125Noted Radar Astrometry database update - see above
2002Noted that JPL Sentry has posted 2011 BB45 as an impact risk - see above
1750Grabbed MPEC 2011-C04 - 2011 BZ44 - see above
Grabbed MPEC 2011-C05 - 2011 BA45 - see above
Grabbed MPEC 2011-C06 - 2011 BB45 - see above
1641Noted that JPL Sentry has updated its 2010 XW58 risk assessment - see above
Noted that NEODyS has updated its 2010 XW58 risk assessment - 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 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 BG40 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BJ24 risk assessment - see above
Noted that NEODyS has posted 2011 BP40 as an impact risk - 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 BX10 risk assessment - see above
Grabbed MPEC 2011-C03 - Daily Orbit Update - see above