Contents  on 4 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 4 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 2048 UTC when the database was dated 4 Feb.

NEOCP Activity  on 4 February '11

The MPC's NEO Confirmation Page has 29 listings: 15 new, 14 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen new and fourteen updated listings. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 32 listings on the NEOCP at some point today.

New MPECs  on 4 February '11

Minor Planet Electronic Circulars

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


MPEC 2011-C15 - "22:51 UT" - 2011 CG2


MPEC 2011-C14 - "17:28 UT" - 2011 CQ1


MPEC 2011-C13 - "14:53 UT" - 2011 CR1


MPEC 2011-C12 - "12:26 UT" - 2011 CQ1


<< DOU on 4 Feb. '11 >>  MPEC 2011-C11 - "07:08 UT" - Daily Orbit Update

Observers  on 4 February '11

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2000 YA
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-C15 -- 2011 CG2
I99Blanquita Obs. in Spain, 1 in MPEC 2011-C15 -- 2011 CG2
B20Carmelita Obs. in Spain, 1 in MPEC 2011-C15 -- 2011 CG2
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2011-C11, 2011-C12, 2011-C13 & 2011-C15 -- 2011 CR1, 2011 CQ1, 2011 CG2, 2010 UB39
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-C15 -- 2011 CG2
046Klet Obs. in the Czech Republic, 5 in MPEC 2011-C11 -- 2010 YB, 2010 XY82, 2010 WQ7, 2010 LF86, 2007 CA27
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-C11 -- 2011 BM45
900Moriyama Obs. in Japan, 2 in MPECs 2011-C14 & 2011-C15 -- 2011 CQ1, 2011 CG2
474Mt. John Obs. in New Zealand, 2 in MPECs 2011-C13 & 2011-C15 -- 2011 CR1, 2011 CG2
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2011-C11 -- 2010 UB39
B49Paus Obs. in Spain, 1 in MPEC 2011-C15 -- 2011 CG2
H06%Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-C15 -- 2011 CG2
H36Sandlot Obs. in Kansas, 6 in MPECs 2011-C11, 2011-C13 & 2011-C15 -- 2011 CR1, 2011 CG2, 2011 BX11, 2011 BO24, 2011 BK24, 2011 BF40
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-C15 -- 2011 CG2
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2011-C11 -- 2003 OU, 219071
H10Tzec Maun Obs. Mayhill in New Mexico, 2 in MPECs 2011-C12 & 2011-C15 -- 2011 CQ1, 2011 CG2
C51WISE in Earth polar orbit, 6 in MPEC 2011-C11 -- 2010 FE7, 2010 EJ43, 2010 EF44, 2010 DX1, 2010 CT, 229007
I15Wishing Star Obs. in Rhode Island, 4 in MPEC 2011-C11 -- 2011 AF37, 137052, 111253, 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 CQ1JPL Sentry19342037-2082193.0e-06-9.15-9.940JPL #2 for the day: "Analysis based on 14 observations spanning .35243 days (2011-Feb-04.23507 to 2011-Feb-04.5875)." Diameter approximately 0.001 km. from mean, weighted H=32.1.
2011 BQ50NEODyS17362020-2088325.77e-06-6.90-7.190NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2011-01-30.403 to 2011-02-01.397."
2011 BM45JPL Sentry17362086-2108137.1e-06-3.33-3.470JPL: "Analysis based on 14 observations spanning 3.1350 days (2011-Jan-30.4027 to 2011-Feb-02.53767)." Diameter approximately 0.157 km. from mean, weighted H=21.7.
NEODyS17362024-208985.86e-06-3.27-3.390NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2011-01-30.403 to 2011-02-02.538."
2011 BL45NEODyS17362011-2090758.69e-05-3.73-3.740NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2011-01-30.345 to 2011-02-02.544."
2011 BF40JPL Sentry1736208313.1e-07-6.39-6.390JPL: "Analysis based on 25 observations spanning 4.0330 days (2011-Jan-30.35537 to 2011-Feb-03.38834)." Diameter approximately 0.037 km. from mean, weighted H=24.8.
NEODyS17362083-208313.8e-07-6.33-6.330NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2011-01-30.356 to 2011-02-03.389."
2011 BO24JPL Sentry1736R E M O V E DJPL: Risk listing removed at 1129 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 4 February '11

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

2254Grabbed MPEC 2011-C15 - 2011 CG2 - see above
2048Noted Radar Astrometry database update - see above
1934Noted that JPL Sentry has updated its 2011 CQ1 risk assessment - see above
1736Noted 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 posted 2011 BL45 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BM45 risk assessment - see above
Noted that NEODyS has posted 2011 BM45 as an impact risk - see above
Noted that JPL Sentry has removed 2011 BO24 as an impact risk - see above
Noted that NEODyS has posted 2011 BQ50 as an impact risk - see above
Noted that JPL Sentry has posted 2011 CQ1 as an impact risk - see above
Grabbed MPEC 2011-C11 - Daily Orbit Update - see above
Grabbed MPEC 2011-C12 - 2011 CQ1 - see above
Grabbed MPEC 2011-C13 - 2011 CR1 - see above
Grabbed MPEC 2011-C14 - 2011 CQ1 - see above