Contents  on 12 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 12 January '11

The MPC's NEO Confirmation Page has 4 listings: 4 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four updated listings. Of these, one was a "one nighter." So far The Tracking News has counted a total of eight 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 12 January '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-A50 - "20:28 UT" - 2011 AR26


MPEC 2011-A49 - "12:20 UT" - 2011 AM24


<< DOU on 12 Jan. '11 >>  MPEC 2011-A48 - "07:11 UT" - Daily Orbit Update


MPEC 2011-A47 - "05:19 UT" - 2011 AL24


MPEC 2011-A46 - "00:45 UT" - Comet P/2011 A1 (Larson)

Observers  on 12 January '11

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2011-A48 -- 2010 YS, 2010 YB, 2010 WD9, 2010 WB9, 3122
300Bisei Spaceguard Center in Japan, 2 in MPECs 2011-A49 & 2011-A50 -- 2011 AR26, 2011 AM24
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2011-A46, 2011-A47, 2011-A48 & 2011-A49 -- 2011 AN16, 2011 AM24, 2011 AL24, P/2011 A1, 2010 XP51, 2010 WP8, 2010 NW117, 2010 LR68, 2003 YS117, 2002 AV31, 159467, 152563, 1580
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPECs 2011-A49 & 2011-A50 -- 2011 AR26, 2011 AM24
379Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2011-A48 -- 2010 JL33
704LINEAR in New Mexico, 12 in MPEC 2011-A48 -- 2011 AX22, 2010 YH, 2010 WQ7, 2010 LF86, 2009 DV42, 2006 WY2, 86324, 162781, 152889, 137924, 137084, 1981
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2011-A46, 2011-A48, 2011-A49 & 2011-A50 -- 2011 AR26, 2011 AM24, 2011 AH5, P/2011 A1
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2011-A46 & 2011-A48 -- 2011 AH5, P/2011 A1, 15745
C20Pulkovo Obs. Kislovodsk Mtn. Station in Russia, 2 in MPEC 2011-A48 -- 2002 EY2, 2001 VK5
I20Rio Cuarto Obs. in Argentina, 2 in MPEC 2011-A48 -- 2010 XK52, 2005 NB7
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-A49 -- 2011 AM24
204Schiaparelli Obs. in Italy, 6 in MPECs 2011-A47, 2011-A48 & 2011-A49 -- 2011 AM24, 2011 AL24, 2011 AH5, 2010 XC25, 2010 WE9, 2009 DV42
645Sloan Digital Sky Survey in New Mexico, 1 in MPEC 2011-A48 -- 2010 WY8
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2011-A48 & 2011-A50 -- 2011 AR26, 2010 YB, 2010 XT45, 53435, 5626
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2011-A48, 2011-A49 & 2011-A50 -- 2011 AR26, 2011 AN16, 2011 AM24, 2011 AM12, 2011 AL5, 2011 AG5, 2010 XW58, 2010 XD11, 2010 PM58
I28Starhoo Obs. in Massachusetts, 3 in MPEC 2011-A48 -- 2010 LR68, 23183, 152563
C51WISE in Earth polar orbit, 1 in MPEC 2011-A48 -- 2011 AL1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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 AM24JPL Sentry15502015-21081651.6e-06-3.23-3.390JPL: "Analysis based on 26 observations spanning .86622 days (2011-Jan-11.45149 to 2011-Jan-12.31771)." Diameter approximately 0.270 km. from mean, weighted H=20.5.
2011 AA23NEODyS15502046-207997.67e-08-6.42-6.830NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2011-01-11.503 to 2011-01-11.761."
2011 AZ22NEODyS15502077-209022.9e-08-9.42-9.670NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2011-01-11.357 to 2011-01-11.696."
2011 AY22NEODyS15502047-2089294.88e-06-6.26-6.80NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2011-01-11.330 to 2011-01-11.666."
2011 AX22JPL Sentry15502052-2110762.5e-06-5.69-6.630JPL: "Analysis based on 36 observations spanning 1.0844 days (2011-Jan-10.30552 to 2011-Jan-11.3899)." Diameter approximately 0.037 km. from mean, weighted H=24.8.
NEODyS15502055-2090171.2e-06-5.99-6.450NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2011-01-10.306 to 2011-01-11.391."
2011 AM12JPL Sentry15502015-2109695.3e-07-2.71-2.850JPL: "Analysis based on 30 observations spanning 3.5508 days (2011-Jan-08.60627 to 2011-Jan-12.15703)." Diameter approximately 0.420 km. from mean, weighted H=19.5.
NEODyS15502015-2089463.59e-07-2.72-2.830NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2011-01-08.607 to 2011-01-12.158."
2011 AL5NEODyS1550R E M O V E D-
JPL Sentry1550R E M O V E DJPL: Risk listing removed at 1133 UTC.
2011 AH5JPL Sentry21232067-210952.0e-05-5.32-5.620JPL: "Analysis based on 54 observations spanning 4.2136 days (2011-Jan-08.33953 to 2011-Jan-12.55318)." Diameter approximately 0.023 km. from mean, weighted H=25.8.
NEODyS15502074-208631.88e-05-5.33-5.630NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2011-01-08.340 to 2011-01-12.078."
2011 AG5JPL Sentry15502030-2054183.9e-05-2.95-3.150JPL: "Analysis based on 34 observations spanning 3.8152 days (2011-Jan-08.2673 to 2011-Jan-12.08245)." Diameter approximately 0.120 km. from mean, weighted H=22.2.
NEODyS15502033-2057163.93e-05-2.93-3.140NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-01-12.083."
2010 XW58JPL Sentry15502065-2106103.7e-06-5.66-6.290JPL: "Analysis based on 43 observations spanning 30.922 days (2010-Dec-11.47391 to 2011-Jan-11.39586)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
NEODyS15502065-208951.02e-06-6.10-6.320NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2010-12-11.475 to 2011-01-11.397."
2010 XC25JPL Sentry15502050-205325.6e-06-3.12-3.140JPL: "Analysis based on 89 observations spanning 32.106 days (2010-Dec-08.37716 to 2011-Jan-09.483333)." Diameter approximately 0.230 km. from mean, weighted H=20.8.
NEODyS15502050-205325.57e-06-3.12-3.140NEODyS: "Based on 91 optical observations (of which 2 are rejected as outliers) from 2010-12-08.378 to 2011-01-09.484."

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 12 January '11

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

2123Noted that JPL Sentry has updated its 2011 AH5 risk assessment - see above
2034Grabbed MPEC 2011-A50 - 2011 AR26 - see above
1550Noted 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 NEODyS has posted 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 NEODyS has updated its 2011 AH5 risk assessment - see above
Noted that JPL Sentry has removed 2011 AL5 as an impact risk - see above
Noted that NEODyS has removed 2011 AL5 as an impact risk - 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 JPL Sentry has posted 2011 AM24 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 AX22 risk assessment - see above
Noted that NEODyS has posted 2011 AX22 as an impact risk - see above
Noted that NEODyS has posted 2011 AY22 as an impact risk - see above
Noted that NEODyS has posted 2011 AZ22 as an impact risk - see above
Grabbed MPEC 2011-A48 - Daily Orbit Update - see above
Grabbed MPEC 2011-A49 - 2011 AM24 - see above
0530Grabbed MPEC 2011-A47 - 2011 AL24 - see above
0229Grabbed MPEC 2011-A46 - Comet P/2011 A1 (Larson) - see above