Contents  on 5 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 5 January '11

The MPC's NEO Confirmation Page has 3 listings: 1 new, 2 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and two updated listings. All of these were "one nighters." 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 5 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-A23 - "16:44 UT" - 2010 YD3


MPEC 2011-A22 - "09:42 UT" - 2011 AH3


MPEC 2011-A21 - "09:27 UT" - 2011 AG3


MPEC 2011-A20 - "09:10 UT" - 2010 AO2


<< DOU on 5 Jan. '11 >>  MPEC 2011-A19 - "07:11 UT" - Daily Orbit Update

Observers  on 5 January '11

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPECs 2011-A19, 2011-A21 & 2011-A22 -- 2011 AH3, 2011 AG3, 2010 WH3, 2010 VE
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-A19 -- 2011 AL1
B66Casasco Obs. in Italy, 1 in MPEC 2011-A19 -- 3838
160Castelmartini Obs. in Italy, 4 in MPEC 2011-A19 -- 2010 WP8, 2010 TP54, 2010 LF86, 2010 JL33
703Catalina Sky Survey (CSS) in Arizona, 7 in MPEC 2011-A19 -- 2010 TP54, 2010 TC47, 252091, 154715, 13651, 6569, 2202
H20Eastern Illinois Univ. Obs. in Illinois, 8 in MPEC 2011-A19 -- 2010 XO10, 2010 OC101, 2005 VQ, 2004 BL11, 2004 BJ86, 2003 YO3, 2001 VB2, 2000 AD205
355Hadano Obs. in Japan, 2 in MPEC 2011-A19 -- 2003 BA21, 2002 KL3
J28Jaen Obs. in Spain, 1 in MPEC 2011-A19 -- 2011 AC3
704LINEAR in New Mexico, 18 in MPEC 2011-A19 -- 2011 AM1, 2011 AL1, 2010 YH, 2010 XP51, 2010 WZ8, 2010 NW117, 2010 LR68, 2010 LF86, 2010 JL33, 2001 YM4, 2000 AC6, 86324, 68278, 34613, 253106, 23183, 154589, 137084
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2011-A19, 2011-A21 & 2011-A22 -- 2011 AH3, 2011 AG3, 2010 YD, 2010 XW58
A06Mataro Obs. in Spain, 2 in MPEC 2011-A19 -- 2010 JL33, 96590
900Moriyama Obs. in Japan, 1 in MPEC 2011-A19 -- 2011 AL1
G96Mt. Lemmon Survey (MLS) in Arizona, 13 in MPECs 2011-A19, 2011-A20, 2011-A21 & 2011-A22 -- 2011 AH3, 2011 AG3, 2010 WY8, 2010 VK188, 2010 AO2, 2009 DC43, 2008 YJ3, 2007 EM88, 99907, 155334, 153814, 138893, 137911
A13Naef Obs. in Switzerland, 1 in MPEC 2011-A19 -- 2011 AM1
291Spacewatch 1.8m telescope in Arizona, 16 in MPECs 2011-A19 & 2011-A22 -- 2011 AH3, 2010 XZ67, 2010 XW58, 2010 XJ3, 2010 XH11, 2010 XG25, 2010 XC25, 2010 WB, 2010 OL100, 2007 DU103, 2006 VD2, 2004 XN50, 2004 XK35, 2001 QP181, 2000 OH, 1999 NA5
C51WISE in Earth polar orbit, 2 in MPECs 2011-A19 & 2011-A23 -- 2010 YD3, 1996 FS1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 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 AH3JPL Sentry15512020-209834.5e-10-5.90-6.110JPL: "Analysis based on 20 observations spanning 1.0949 days (2011-Jan-04.23212 to 2011-Jan-05.32703)." Diameter approximately 0.550 km. from mean, weighted H=18.9.
2011 AE3NEODyS23592020-20901411.13e-05-6.33-7.20NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2011-01-04.239 to 2011-01-04.282."
2011 AD3NEODyS15512032-2080104.36e-09-8.80-9.10NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2011-01-04.231 to 2011-01-04.311."
2010 YDJPL Sentry1551205213.9e-08-8.17-8.170JPL: "Analysis based on 37 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.
NEODyS1551R E M O V E D-
2010 XW58JPL Sentry15512014-2106205.2e-06-5.21-5.760JPL: "Analysis based on 33 observations spanning 23.905 days (2010-Dec-11.47391 to 2011-Jan-04.37857)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
NEODyS15512018-2088201.53e-06-5.49-6.010NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2010-12-11.475 to 2011-01-04.379."
2010 XC25JPL Sentry15512048-205544.4e-06-3.21-3.300JPL: "Analysis based on 71 observations spanning 27.113 days (2010-Dec-08.37716 to 2011-Jan-04.49009)." Diameter approximately 0.230 km. from mean, weighted H=20.8.
NEODyS15512048-207064.44e-06-3.21-3.310NEODyS: "Based on 72 optical observations (of which 1 are rejected as outliers) from 2010-12-08.378 to 2011-01-04.491."

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 5 January '11

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

2359Noted that NEODyS has posted 2011 AE3 as an impact risk - see above
1810Grabbed MPEC 2011-A23 - 2010 YD3 - see above
1551Noted 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 removed 2010 YD as an impact risk - see above
Noted that NEODyS has posted 2011 AD3 as an impact risk - see above
Noted that JPL Sentry has posted 2011 AH3 as an impact risk - see above
Grabbed MPEC 2011-A19 - Daily Orbit Update - see above
Grabbed MPEC 2011-A20 - 2010 AO2 - see above
Grabbed MPEC 2011-A21 - 2011 AG3 - see above
Grabbed MPEC 2011-A22 - 2011 AH3 - see above