Contents  on 3 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 3 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 0504 UTC when the database was dated 2 Feb.

NEOCP Activity  on 3 February '11

The MPC's NEO Confirmation Page has 28 listings: 15 new, 13 updated

When last checked at 2146 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen new and thirteen updated listings. Of these, 26 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 3 February '11

Minor Planet Electronic Circulars

As of last check at 2146 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-C10 - "13:30 UT" - 2011 BQ50


MPEC 2011-C09 - "11:26 UT" - 2011 BM45


MPEC 2011-C08 - "11:21 UT" - 2011 BL45


<< DOU on 3 Feb. '11 >>  MPEC 2011-C07 - "07:08 UT" - Daily Orbit Update

Observers  on 3 February '11

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2000 YA
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2011-C07 & 2011-C09 -- 2011 BM45, 2011 BC40, 2003 HR32
300Bisei Spaceguard Center in Japan, 2 in MPEC 2011-C07 -- 2011 BB45, 2011 BA45
703Catalina Sky Survey in Arizona, 1 in MPEC 2011-C07 -- 192563
G58Chabot Obs. in northern California, 4 in MPEC 2011-C07 -- 2011 BL24, 2011 BD40, 2011 BC40, 2011 BB
J27El Guijo Obs. in Spain, 1 in MPEC 2011-C07 -- 36284
J28Jaen Obs. in Spain, 2 in MPEC 2011-C07 -- 137052, 1864
046Klet Obs. in the Czech Republic, 7 in MPEC 2011-C07 -- 2011 BZ18, 2011 BV10, 2011 AO52, 2011 AN16, 2011 AM24, 2011 AF37, 2011 AA37
B28Mandi Obs. in Italy, 1 in MPEC 2011-C07 -- 2011 AF37
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-C10 -- 2011 BQ50
A13Naef Obs. in Switzerland, 2 in MPEC 2011-C07 -- 2010 PR10, 2002 EY2
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2011-C07, 2011-C08, 2011-C09 & 2011-C10 -- 2011 BQ50, 2011 BM45, 2011 BL45, 2011 BB45, 2011 AR26, 2003 WB25, 251346, 206378, 10563
B49Paus Obs. in Spain, 1 in MPEC 2011-C07 -- 2011 AF37
A53Peschiera del Garda Obs. in Italy, 5 in MPEC 2011-C07 -- 36284, 23183, 175706, 152563, 143381
A41Rezman Obs. in Slovenia, 1 in MPEC 2011-C07 -- 238456
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2011-C07 -- 2011 BA12
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2011-C07 -- 2011 BX18, 2011 BX10, 2011 BN24, 2011 BM24, 2011 BF40, 2011 AR26, 2011 AK37
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 February '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2146 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 BQ50JPL Sentry16372019-21093445.7e-06-6.89-7.550JPL: "Analysis based on 6 observations spanning 1.9934 days (2011-Jan-30.4027 to 2011-Feb-01.396143)." Diameter approximately 0.007 km. from mean, weighted H=28.4.
2011 BM45JPL Sentry16372024-2111165.4e-06-3.49-3.620JPL: "Analysis based on 11 observations spanning 3.1350 days (2011-Jan-30.4027 to 2011-Feb-02.53767)." Diameter approximately 0.150 km. from mean, weighted H=21.8.
2011 BB45JPL Sentry16372023-2109205.5e-08-4.12-4.270JPL: "Analysis based on 19 observations spanning 3.2643 days (2011-Jan-30.34723 to 2011-Feb-02.61158)." Diameter approximately 0.489 km. from mean, weighted H=19.2.
NEODyS16372025-209073.42e-08-4.07-4.090NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2011-01-30.348 to 2011-02-02.612."
2011 BF40JPL Sentry16372037-208352.0e-06-5.17-5.180JPL: "Analysis based on 22 observations spanning 3.0052 days (2011-Jan-30.35537 to 2011-Feb-02.36062)." Diameter approximately 0.038 km. from mean, weighted H=24.7.
NEODyS16372037-208351.82e-06-5.23-5.230NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2011-01-30.356 to 2011-02-02.361."
2011 BN24NEODyS1637R E M O V E D-
JPL Sentry1637R E M O V E DJPL: Risk listing removed at 1051 UTC.
2011 BM24NEODyS1637R E M O V E D-
2011 BX18JPL Sentry16372030-2110371.1e-07-3.37-3.780JPL: "Analysis based on 26 observations spanning 6.8960 days (2011-Jan-26.31025 to 2011-Feb-02.20622)." Diameter approximately 0.827 km. from mean, weighted H=18.1.
NEODyS16372016-2088411.78e-07-3.03-3.720NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2011-01-26.311 to 2011-02-02.207."
2011 BA12JPL Sentry16372079-211051.0e-05-4.14-4.290JPL: "Analysis based on 63 observations spanning 8.9888 days (2011-Jan-25.1938 to 2011-Feb-03.1826)." Diameter approximately 0.095 km. from mean, weighted H=22.8.
NEODyS16372079-207916.8e-06-4.28-4.280NEODyS: "Based on 63 optical observations (of which 0 are rejected as outliers) from 2011-01-25.195 to 2011-02-03.183."
2011 BX10JPL Sentry1637210812.6e-10-6.74-6.740JPL: "Analysis based on 63 observations spanning 9.9942 days (2011-Jan-24.13405 to 2011-Feb-03.1282)." Diameter approximately 0.710 km. from mean, weighted H=18.4.
2011 AK37JPL Sentry1637209711.9e-06-6.03-6.030JPL: "Analysis based on 28 observations spanning 19.997 days (2011-Jan-13.30429 to 2011-Feb-02.30082)." Diameter approximately 0.031 km. from mean, weighted H=25.2.

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 3 February '11

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

1637Noted that JPL Sentry has updated its 2011 AK37 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 updated its 2011 BB45 risk assessment - see above
Noted that NEODyS has posted 2011 BB45 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BF40 risk assessment - see above
Noted that NEODyS has updated its 2011 BF40 risk assessment - see above
Noted that NEODyS has removed 2011 BM24 as an impact risk - see above
Noted that JPL Sentry has posted 2011 BM45 as an impact risk - see above
Noted that JPL Sentry has removed 2011 BN24 as an impact risk - see above
Noted that NEODyS has removed 2011 BN24 as an impact risk - see above
Noted that JPL Sentry has posted 2011 BQ50 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BX10 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
Grabbed MPEC 2011-C07 - Daily Orbit Update - see above
Grabbed MPEC 2011-C08 - 2011 BL45 - see above
Grabbed MPEC 2011-C09 - 2011 BM45 - see above
Grabbed MPEC 2011-C10 - 2011 BQ50 - see above
0504Noted Radar Astrometry database update - see above