Contents  on 9 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 9 January '11

The MPC's NEO Confirmation Page has 3 listings: 3 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three updated listings. So far The Tracking News has counted a total of eleven 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 9 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-A35 - "12:03 UT" - 2011 AL5


MPEC 2011-A34 - "11:30 UT" - 2011 AK5


<< DOU on 9 Jan. '11 >>  MPEC 2011-A33 - "07:12 UT" - Daily Orbit Update


MPEC 2011-A32 - "04:42 UT" - 2011 AH5


MPEC 2011-A31 - "04:20 UT" - 2011 AG5


MPEC 2011-A30 - "00:41 UT" - 2011 AU4

Observers  on 9 January '11

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 2 in MPEC 2011-A33 -- 2011 AL1, 2011 AC3
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2011-A31, 2011-A33, 2011-A34 & 2011-A35 -- 2011 AL5, 2011 AK5, 2011 AG5, 2010 YH, 2010 WL, 2010 UF7, 3122
300Bisei Spaceguard Center in Japan, 21 in MPECs 2011-A30, 2011-A31 & 2011-A33 -- 2011 AU4, 2011 AG5, 2010 YD, 2010 WZ8, 2010 WB, 2010 VY190, 2010 SC41, 2010 RF181, 2010 LF86, 2010 JL33, 2008 YU32, 2007 VC138, 2006 VB14, 96590, 141498, 138852, 137084, 100926, 5869, 3838, 3122
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2011-A32 & 2011-A33 -- 2011 AH5, 2010 XG3, 2010 WJ, 2010 RF181, 177255, 5496
448Desert Moon Obs. in New Mexico, 1 in MPEC 2011-A33 -- 2010 XT45
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 5 in MPEC 2011-A33 -- 2011 AL1, 2011 AC3, 2010 XX58, 2010 XP51, 2010 WP8
J95Great Shefford Obs. in England, 5 in MPECs 2011-A30, 2011-A31, 2011-A32, 2011-A33 & 2011-A34 -- 2011 AU4, 2011 AN4, 2011 AK5, 2011 AH5, 2011 AG5
704LINEAR in New Mexico, 6 in MPEC 2011-A33 -- 2010 XG3, 25916, 252091, 154715, 12923, 4688
B33Libbiano Obs. in Italy, 1 in MPEC 2011-A31 -- 2011 AG5
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2011-A30, 2011-A31, 2011-A33, 2011-A34 & 2011-A35 -- 2011 AU4, 2011 AL5, 2011 AK5, 2011 AH3, 2011 AG5, 2010 XW58
474Mt. John Obs. in New Zealand, 6 in MPECs 2011-A31 & 2011-A33 -- 2011 AN4, 2011 AG5, 2010 XK52, 2010 XC25, 2010 VC1, 2010 SR3
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2011-A30, 2011-A31, 2011-A33, 2011-A34 & 2011-A35 -- 2011 AU4, 2011 AL5, 2011 AK5, 2011 AG5, 2006 YD, 1999 PJ1, 22771
J93Mt. Tuffley Obs. in England, 2 in MPEC 2011-A33 -- 96590, 3122
A13Naef Obs. in Switzerland, 1 in MPEC 2011-A33 -- 5496
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPEC 2011-A33 -- 251722, 251346, 250706, 250162, 249816, 249615, 248818, 244670, 234061
H36Sandlot Obs. in Kansas, 4 in MPECs 2011-A30, 2011-A32 & 2011-A33 -- 2011 AU4, 2011 AH5, 2007 AA9, 2005 EE
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2011-A33 -- 2010 WB9, 2010 LR68
291Spacewatch 1.8m telescope in Arizona, 10 in MPEC 2011-A33 -- 2011 AH3, 2010 XZ72, 2010 XX72, 2010 XW58, 2010 XG25, 2010 XC11, 2010 KY127, 2005 EE, 1998 HK49, 250162
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 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 AL5JPL Sentry17142103-210541.1e-08-7.08-7.470JPL: "Analysis based on 17 observations spanning 1.0194 days (2011-Jan-08.33503 to 2011-Jan-09.354381)." Diameter approximately 0.100 km. from mean, weighted H=22.6.
2011 AH5NEODyS17152031-2090591.26e-05-5.41-6.00NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2011-01-08.340 to 2011-01-09.033."
JPL Sentry17142031-21104502.0e-05-5.31-5.940JPL: "Analysis based on 13 observations spanning .69277 days (2011-Jan-08.33953 to 2011-Jan-09.0323)." Diameter approximately 0.022 km. from mean, weighted H=26.0.
2011 AG5NEODyS17152013-2088833.57e-05-2.47-3.160NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-01-09.156."
JPL Sentry06082013-20871154.2e-05-2.48-3.300JPL: "Analysis based on 25 observations spanning .88835 days (2011-Jan-08.2673 to 2011-Jan-09.155648)." Diameter approximately 0.130 km. from mean, weighted H=22.1.
2011 AH3NEODyS1714R E M O V E D-
JPL Sentry1714R E M O V E DJPL: Risk listing removed at 1130 UTC.
2010 YDJPL Sentry1714209117.9e-08-8.17-8.170JPL: "Analysis based on 41 observations spanning 10.136 days (2010-Dec-25.37287 to 2011-Jan-04.50918)." Diameter approximately 0.016 km. from mean, weighted H=26.6.
2010 XW58JPL Sentry17142063-2106134.2e-06-5.58-6.340JPL: "Analysis based on 38 observations spanning 27.993 days (2010-Dec-11.47391 to 2011-Jan-08.46646)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
NEODyS17142063-208993.88e-07-6.52-6.920NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2010-12-11.475 to 2011-01-08.467."
2010 XC25JPL Sentry17142050-206337.9e-06-2.94-2.970JPL: "Analysis based on 80 observations spanning 31.271 days (2010-Dec-08.37716 to 2011-Jan-08.64797)." Diameter approximately 0.240 km. from mean, weighted H=20.8.
NEODyS17142050-206348.07e-06-2.93-2.980NEODyS: "Based on 82 optical observations (of which 2 are rejected as outliers) from 2010-12-08.378 to 2011-01-08.650."

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 9 January '11

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

1714Noted 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 updated its 2010 YD risk assessment - see above
Noted that NEODyS has posted 2011 AG5 as an impact risk - see above
Noted that JPL Sentry has removed 2011 AH3 as an impact risk - see above
Noted that NEODyS has removed 2011 AH3 as an impact risk - see above
Noted that JPL Sentry has posted 2011 AH5 as an impact risk - see above
Noted that NEODyS has posted 2011 AH5 as an impact risk - see above
Noted that JPL Sentry has posted 2011 AL5 as an impact risk - see above
Grabbed MPEC 2011-A33 - Daily Orbit Update - see above
Grabbed MPEC 2011-A34 - 2011 AK5 - see above
Grabbed MPEC 2011-A35 - 2011 AL5 - see above
0608Noted that JPL Sentry has posted 2011 AG5 as an impact risk - see above
0501Grabbed MPEC 2011-A32 - 2011 AH5 - see above
0432Grabbed MPEC 2011-A31 - 2011 AG5 - see above
0100Grabbed MPEC 2011-A30 - 2011 AU4 - see above