2010 JL33 rotates in radar imagery. 
Credit: NASA/JPL Goldstone.

NASA/JPL has released radar imagery from December when 2010 JL33 was at about 22 lunar distances from Earth, describing it as "an irregular, elongated object roughly 1.8 kilometers (1.1 miles) wide that rotates once every nine hours [and has] a large concavity that may be an impact crater." See also this. Credit: NASA/JPL Goldstone.


Contents  on 13 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 13 January '11

The MPC's NEO Confirmation Page has 11 listings: 1 new, 10 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and ten updated listings. Of these, eight were "one nighters." So far The Tracking News has counted a total of seventeen 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 13 January '11

Minor Planet Electronic Circulars

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


MPEC 2011-A56 - "21:57 UT" - 2011 AB37


MPEC 2011-A55 - "21:51 UT" - 2011 AA37


MPEC 2011-A54 - "21:45 UT" - 2011 AZ36


MPEC 2011-A53 - "09:21 UT" - 2011 AT26


<< DOU on 13 Jan. '11 >>  MPEC 2011-A52 - "07:11 UT" - Daily Orbit Update


MPEC 2011-A51 - "04:50 UT" - 2011 AS26

Observers  on 13 January '11

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-A52 -- 2010 UX6
300Bisei Spaceguard Center in Japan, 4 in MPECs 2011-A51, 2011-A54, 2011-A55 & 2011-A56 -- 2011 AZ36, 2011 AS26, 2011 AB37, 2011 AA37
I99Blanquita Obs. in Spain, 1 in MPEC 2011-A52 -- 152563
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2011-A52, 2011-A55 & 2011-A56 -- 2011 AB37, 2011 AA37, 154715, 141498
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 4 in MPEC 2011-A52 -- 2011 AL24, 2011 AG5, 2011 AA23, 2004 YZ23
I19El Gato Gris Obs. in Argentina, 3 in MPEC 2011-A52 -- 2011 AN16, 2011 AC3, 2010 XC25
H01Magdalena Ridge Obs. in New Mexico, 1 in MPECs 2011-A52 & 2011-A53 -- 2011 AT26
B90Malina River Obs. in Italy, 1 in MPEC 2011-A52 -- 3554
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2011-A52, 2011-A53 & 2011-A54 -- 2011 AZ36, 2011 AT26, 2010 XL69, 96315, 153958
I20Rio Cuarto Obs. in Argentina, 2 in MPEC 2011-A52 -- 2011 AN16, 2011 AC3
H36Sandlot Obs. in Kansas, 2 in MPECs 2011-A51 & 2011-A52 -- 2011 AS26, 2011 AH5
E12Siding Spring Survey (SSS) in New South Wales, 18 in MPEC 2011-A52 -- 2010 XC15, 2010 WB, 2010 TC55, 2007 VC138, 2007 EJ26, 2006 OS9, 2006 KM103, 2004 XY60, 2004 BE11, 68350, 248083, 241662, 159609, 154715, 144900, 11405, 7482, 5131
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2011-A51 & 2011-A52 -- 2011 AS26, 159467
291Spacewatch 1.8m telescope in Arizona, 15 in MPECs 2011-A51, 2011-A52, 2011-A53 & 2011-A54 -- 2011 AZ36, 2011 AX22, 2011 AU4, 2011 AT26, 2011 AS26, 2011 AM12, 2011 AL5, 2011 AK5, 2011 AH3, 2011 AG5, 2011 AA23, 2010 XY82, 2010 XW58, 2010 VZ, 244977
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-A52 -- 2011 AH5
C51WISE in Earth polar orbit, 5 in MPEC 2011-A52 -- 2010 EH20, 2007 MK13, 249886, 219071, 198856
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 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 AT26JPL Sentry1632207412.1e-10-8.06-8.060JPL: "Analysis based on 20 observations spanning 2.0703 days (2011-Jan-11.29459 to 2011-Jan-13.3649)." Diameter approximately 0.180 km. from mean, weighted H=21.4.
NEODyS16322074-207423.8e-10-7.52-7.820NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2011-01-11.295 to 2011-01-13.366."
2011 AM24NEODyS16322015-2088477.4e-07-3.40-3.460NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2011-01-11.452 to 2011-01-12.318."
2011 AA23NEODyS1632R E M O V E D-
JPL Sentry1632R E M O V E DJPL: Risk listing removed at 1257 UTC.
2011 AX22JPL Sentry16322049-2110542.3e-05-4.72-4.970JPL: "Analysis based on 39 observations spanning 2.8288 days (2011-Jan-10.30552 to 2011-Jan-13.13435)." Diameter approximately 0.037 km. from mean, weighted H=24.8.
NEODyS16322052-2083131.3e-05-4.91-4.980NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2011-01-10.306 to 2011-01-13.135."
2011 AM12JPL Sentry16322015-2109741.2e-06-2.45-2.710JPL: "Analysis based on 33 observations spanning 4.5557 days (2011-Jan-08.60627 to 2011-Jan-13.162)." Diameter approximately 0.420 km. from mean, weighted H=19.5.
NEODyS16322015-2089367.7e-07-2.45-2.650NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2011-01-08.607 to 2011-01-13.163."
2011 AH5JPL Sentry16322067-210952.0e-05-5.37-5.670JPL: "Analysis based on 54 observations spanning 4.2136 days (2011-Jan-08.33953 to 2011-Jan-12.55318)." Diameter approximately 0.022 km. from mean, weighted H=25.9.
NEODyS16322074-208321.98e-05-5.35-5.630NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2011-01-08.340 to 2011-01-12.554."
2011 AG5JPL Sentry16322033-2054163.3e-05-2.97-3.190JPL: "Analysis based on 42 observations spanning 4.8298 days (2011-Jan-08.2673 to 2011-Jan-13.0971)." Diameter approximately 0.130 km. from mean, weighted H=22.1.
NEODyS16322036-2052133.45e-05-2.96-3.170NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-01-13.098."
2010 XW58JPL Sentry16322063-2106123.9e-06-5.64-6.330JPL: "Analysis based on 46 observations spanning 31.822 days (2010-Dec-11.47391 to 2011-Jan-12.29614)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
NEODyS16322065-208778.94e-07-6.15-6.350NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2010-12-11.475 to 2011-01-12.297."
2010 XC25JPL Sentry16322050-205325.6e-06-3.12-3.130JPL: "Analysis based on 92 observations spanning 35.889 days (2010-Dec-08.37716 to 2011-Jan-13.26662)." Diameter approximately 0.230 km. from mean, weighted H=20.8.
NEODyS16322050-206335.71e-06-3.11-3.130NEODyS: "Based on 94 optical observations (of which 2 are rejected as outliers) from 2010-12-08.378 to 2011-01-13.267."

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 13 January '11

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

2232Grabbed MPEC 2011-A54 - 2011 AZ36 - see above
Grabbed MPEC 2011-A55 - 2011 AA37 - see above
Grabbed MPEC 2011-A56 - 2011 AB37 - see above
1632Noted that JPL Sentry has updated its 2010 XC25 risk assessment - see above
Noted that NEODyS has updated its 2010 XC25 risk assessment - see above
Noted 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 removed 2011 AA23 as an impact risk - see above
Noted that NEODyS has removed 2011 AA23 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 JPL Sentry has updated its 2011 AH5 risk assessment - see above
Noted that NEODyS has updated its 2011 AH5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 AM12 risk assessment - see above
Noted that NEODyS has updated its 2011 AM12 risk assessment - see above
Noted that NEODyS has posted 2011 AM24 as an impact risk - see above
Noted that JPL Sentry has posted 2011 AT26 as an impact risk - see above
Noted that NEODyS has posted 2011 AT26 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 AX22 risk assessment - see above
Noted that NEODyS has updated its 2011 AX22 risk assessment - see above
Grabbed MPEC 2011-A52 - Daily Orbit Update - see above
Grabbed MPEC 2011-A53 - 2011 AT26 - see above
0518Grabbed MPEC 2011-A51 - 2011 AS26 - see above