Contents  on 15 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 15 June '11

The MPC's NEO Confirmation Page has 2 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two objects listed. Both of these were "one nighters." So far The Tracking News has counted a total of thirteen 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 15 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-L58 - "11:05 UT" - 2011 LH21

<< DOU on 15 June '11 >>  MPEC 2011-L57 - "07:08 UT" - Daily Orbit Update

Observers  on 15 June '11

Eight observers appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2011-L57 -- 2011 LT17
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 18 in MPECs 2011-L57 & 2011-L58 -- 2011 LT17, 2011 LL2, 2011 LH21, 2011 LH, 2011 LD19, 2011 LA19, 2011 KW15, 2011 KP16, 2011 KO17, 2011 KC15, 2011 GD62, 2011 GA62, 2011 DL19, 2011 BB, 2009 AH16, 2006 UQ217, 2001 QP181, 2001 MQ3
704LINEAR in New Mexico, 1 in MPEC 2011-L57 -- 137170
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2011-L57 & 2011-L58 -- 2011 LH21, 86039
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2011-L57 & 2011-L58 -- 2011 LH21, 2011 JA8
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPEC 2011-L57 -- 2011 LL2, 2011 KF4
461SZTE Asteroid Program in Hungary, 1 in MPEC 2011-L57 -- 2011 LA19
204Schiaparelli Obs. in Italy, 3 in MPEC 2011-L57 -- 2011 LT17, 2011 LA19, 2009 WW104
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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 LC19JPL Sentry15582020-2110371.5e-07-3.40-4.070JPL: "Analysis based on 22 observations spanning 1.7424 days (2011-Jun-10.3103 to 2011-Jun-12.05275)." Diameter approximately 0.774 km. from mean, weighted H=18.2.
NEODyS15582040-205852.58e-09-5.13-5.260NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2011-06-10.311 to 2011-06-12.054."
2011 LA19JPL Sentry15582040-207723.0e-09-5.39-5.410JPL: "Analysis based on 47 observations spanning 5.7272 days (2011-Jun-09.29963 to 2011-Jun-15.02678)." Diameter approximately 0.519 km. from mean, weighted H=19.1.
2011 LT17JPL Sentry15582072-210141.6e-06-4.33-4.520JPL: "Analysis based on 76 observations spanning 5.6627 days (2011-Jun-09.33984 to 2011-Jun-15.00251)." Diameter approximately 0.150 km. from mean, weighted H=21.8.
NEODyS15582072-207321.33e-06-4.36-4.370NEODyS #2 for the day: "Based on 77 optical observations (of which 1 are rejected as outliers) from 2011-06-09.341 to 2011-06-15.003."

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 15 June '11

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

1558Noted that JPL Sentry has updated its 2011 LA19 risk assessment - see above
Noted that JPL Sentry has posted 2011 LC19 as an impact risk - see above
Noted that NEODyS has posted 2011 LC19 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 LT17 risk assessment - see above
Noted that NEODyS has updated its 2011 LT17 risk assessment - see above
Grabbed MPEC 2011-L57 - Daily Orbit Update - see above
Grabbed MPEC 2011-L58 - 2011 LH21 - see above
0617Noted that NEODyS has updated its 2011 LT17 risk assessment - see above