Contents  on 11 January '11


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 11 January '11

The MPC's NEO Confirmation Page has 7 listings: 7 updated

When last checked at 2329 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven updated listings. Of these, six were "one nighters." So far The Tracking News has counted a total of thirteen 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 11 January '11

Minor Planet Electronic Circulars

As of last check at 2329 UTC, there have been seven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2011-A45 - "21:19 UT" - 2011 AA23

MPEC 2011-A44 - "21:12 UT" - 2011 AZ22

MPEC 2011-A43 - "20:53 UT" - 2011 AY22

MPEC 2011-A42 - "16:51 UT" - 2011 AX22

<< DOU on 11 Jan. '11 >>  MPEC 2011-A41 - "07:12 UT" - Daily Orbit Update

MPEC 2011-A40 - "05:26 UT" - 2011 AN16

MPEC 2011-A39 - "05:19 UT" - 2011 AM16

Observers  on 11 January '11

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2011-A39, 2011-A40 & 2011-A41 -- 2011 AN16, 2011 AM16, 2010 YW, 2010 XK52, 2010 VY190
300Bisei Spaceguard Center in Japan, 4 in MPECs 2011-A42, 2011-A43, 2011-A44 & 2011-A45 -- 2011 AZ22, 2011 AY22, 2011 AX22, 2011 AA23
703Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2011-A41, 2011-A42, 2011-A43, 2011-A44 & 2011-A45 -- 2011 AZ22, 2011 AY22, 2011 AX22, 2011 AA23, 2010 RN80, 2010 OQ1, 253841, 23183, 185851, 152563
H20Eastern Illinois Univ. Obs. in Illinois, 1 in MPEC 2011-A41 -- 2004 QT24
157Frasso Sabino Obs. in Italy, 4 in MPEC 2011-A41 -- 2010 YB, 2010 WE9, 2010 PR10, 253841
J95Great Shefford Obs. in England, 1 in MPEC 2011-A41 -- 2011 AH5
704LINEAR in New Mexico, 16 in MPEC 2011-A41 -- 2010 WQ7, 2010 NW117, 2010 LF86, 2009 DV42, 2006 WY2, 2004 YZ23, 2002 BN, 2002 AV31, 86324, 85275, 162781, 153842, 141498, 137924, 4401, 1981
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2011-A39, 2011-A42, 2011-A43 & 2011-A44 -- 2011 AZ22, 2011 AY22, 2011 AX22, 2011 AM16
474Mt. John Obs. in New Zealand, 1 in MPEC 2011-A40 -- 2011 AN16
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2011-A39, 2011-A41 & 2011-A42 -- 2011 AX22, 2011 AM16, 34613
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPEC 2011-A41 -- 2007 TY18, 2006 BN6, 2004 KE1, 2002 DY3, 252558, 242211, 230118
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2011-A40 -- 2011 AN16
204Schiaparelli Obs. in Italy, 9 in MPEC 2011-A41 -- 2010 YD, 2010 YB, 2010 XZ67, 2010 XP51, 2010 XG3, 2010 XB24, 2010 WQ7, 2010 WP8, 2010 RF181
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-A40 -- 2011 AN16
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2011-A41 -- 2010 XP51, 2003 YS117, 2000 QN130
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2011-A39, 2011-A41 & 2011-A43 -- 2011 AY22, 2011 AM16, 2010 VE1, 2010 VE, 2010 QD2, 2010 NG3
I15Wishing Star Obs. in Rhode Island, 6 in MPEC 2011-A41 -- 2011 AL1, 2010 XX58, 2010 WE9, 2006 WY2, 1997 XS2, 241662
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 January '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2329 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.





Notes for Today's Latest Risk Assessments
2011 AA23JPL Sentry23292043-2087134.9e-08-6.62-7.090JPL: "Analysis based on 10 observations spanning .25776 days (2011-Jan-11.5025 to 2011-Jan-11.76026)." Diameter approximately 0.071 km. from mean, weighted H=23.4.
2011 AZ22JPL Sentry23292034-211056.9e-07-7.84-8.020JPL: "Analysis based on 16 observations spanning .33881 days (2011-Jan-11.35594 to 2011-Jan-11.69475)." Diameter approximately 0.006 km. from mean, weighted H=28.6.
2011 AY22JPL Sentry23292047-2109479.4e-06-6.08-6.720JPL: "Analysis based on 21 observations spanning .33634 days (2011-Jan-11.32922 to 2011-Jan-11.66556)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
2011 AX22JPL Sentry20002047-21101084.3e-06-5.40-5.640JPL: "Analysis based on 32 observations spanning 1.0844 days (2011-Jan-10.30552 to 2011-Jan-11.3899)." Diameter approximately 0.036 km. from mean, weighted H=24.9.
2011 AH5JPL Sentry23292067-210981.4e-05-5.48-5.810JPL #2 for the day: "Analysis based on 27 observations spanning 3.1041 days (2011-Jan-08.33953 to 2011-Jan-11.44367)." Diameter approximately 0.023 km. from mean, weighted H=25.9.
NEODyS16252066-209068.23e-06-5.73-6.190NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2011-01-08.340 to 2011-01-09.985."
2010 YDJPL Sentry1625205214.5e-08-8.12-8.120JPL: "Analysis based on 44 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.

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 11 January '11

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

2329Noted that JPL Sentry has posted 2011 AA23 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 AH5 risk assessment - see above
Noted that JPL Sentry has posted 2011 AY22 as an impact risk - see above
Noted that JPL Sentry has posted 2011 AZ22 as an impact risk - see above
2152Grabbed MPEC 2011-A43 - 2011 AY22 - see above
Grabbed MPEC 2011-A44 - 2011 AZ22 - see above
Grabbed MPEC 2011-A45 - 2011 AA23 - see above
2000Noted that JPL Sentry has posted 2011 AX22 as an impact risk - see above
1801Grabbed MPEC 2011-A42 - 2011 AX22 - see above
1625Noted that JPL Sentry has updated its 2010 YD 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
Grabbed MPEC 2011-A41 - Daily Orbit Update - see above
0605Grabbed MPEC 2011-A40 - 2011 AN16 - see above
0528Grabbed MPEC 2011-A39 - 2011 AM16 - see above