Contents  on 13 June '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 13 June '11

The MPC's NEO Confirmation Page has 88 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 88 objects listed. Of these, 64 were "one nighters." So far The Tracking News has counted a total of 102 listings on the NEOCP 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 June '11

Minor Planet Electronic Circulars

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

MPEC 2011-L53 - "17:23 UT" - 2010 LG14

<< DOU on 13 June '11 >>  MPEC 2011-L52 - "07:08 UT" - Daily Orbit Update

Observers  on 13 June '11

Eleven observers appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2011-L52 -- 2011 LT17
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2011-L52 & 2011-L53 -- 2011 KN9, 2011 JA8, 2011 AO52, 2010 LG14, 2006 OY10, 274855, 162913
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2011-L52 -- 2011 LT17, 2011 LL2, 2011 LJ1, 2011 LD1, 2011 KR12, 2011 KN17
448Desert Moon Obs. in New Mexico, 5 in MPEC 2011-L52 -- 2011 KW19, 2011 KN9, 2008 HE, 99799, 37336
J95Great Shefford Obs. in England, 1 in MPEC 2011-L52 -- 2011 LK19
704LINEAR in New Mexico, 1 in MPEC 2011-L52 -- 7482
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2011-L52 & 2011-L53 -- 2011 LZ2, 2011 JK, 2010 LG14, 194126, 145656
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2011-L52 -- 96189, 86039, 138155
461SZTE Asteroid Program in Hungary, 1 in MPEC 2011-L53 -- 2010 LG14
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2011-L52 & 2011-L53 -- 2011 LJ1, 2011 KE3, 2010 TV149, 2010 OF101, 2010 LG14, 2009 AV, 163335
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2011-L52 -- 2011 LZ2, 2011 LJ1, 2011 KQ19, 2011 HC36
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 June '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 risk pages.





Notes for Today's Latest Risk Assessments
2011 LT17JPL Sentry15282072-211071.9e-06-4.12-4.280JPL: "Analysis based on 56 observations spanning 3.5206 days (2011-Jun-09.33984 to 2011-Jun-12.860458)." Diameter approximately 0.170 km. from mean, weighted H=21.5.
NEODyS15282072-207321.85e-06-4.08-4.10NEODyS: "Based on 57 optical observations (of which 1 are rejected as outliers) from 2011-06-09.341 to 2011-06-12.861."
2011 KN17JPL Sentry1528207113.8e-07-5.17-5.170JPL: "Analysis based on 88 observations spanning 12.970 days (2011-May-30.27802 to 2011-Jun-12.24787)." Diameter approximately 0.100 km. from mean, weighted H=22.6.
NEODyS1528R E M O V E D-
2011 AG5NEODyS15282040-204747.14e-04-1.47-1.471NEODyS: "Based on 139 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-06-11.450."

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 June '11

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

1730Grabbed MPEC 2011-L53 - 2010 LG14 - see above
1528Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 KN17 risk assessment - see above
Noted that NEODyS has removed 2011 KN17 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 LT17 risk assessment - see above
Noted that NEODyS has posted 2011 LT17 as an impact risk - see above
Grabbed MPEC 2011-L52 - Daily Orbit Update - see above