Contents  on 30 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 30 June '11

The MPC's NEO Confirmation Page has 4 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four objects listed. Of these, one was a "one nighter." So far The Tracking News has counted a total of seven 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 30 June '11

Minor Planet Electronic Circulars

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

MPEC 2011-M54 - "17:32 UT" - 2010 DP

MPEC 2011-M53 - "17:31 UT" - 2008 SQ7

<< DOU on 30 June '11 >>  MPEC 2011-M52 - "07:06 UT" - Daily Orbit Update

Observers  on 30 June '11

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
7057program code 7 via Apache Point Obs. in New Mexico, 2 in MPEC 2011-M52 -- 2006 UK, 2005 TB15
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2011-M52, 2011-M53 & 2011-M54 -- 2011 MV1, 2011 MU, 2011 MT, 2011 MK, 2011 MJ, 2011 ME, 2011 MD, 2011 LX10, 2011 LJ1, 2011 LD19, 2011 LC19, 2011 LA19, 2011 KQ19, 2011 KC15, 2011 GZ54, 2010 DP, 2008 SQ7, 2008 GH110, 2006 WP127
300Bisei Spaceguard Center in Japan, 7 in MPEC 2011-M52 -- 2011 EZ78, 274138, 20086, 137170, 7482, 7358, 1866
807|Robert Holmes via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-M52 -- 2011 ET29
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 2 in MPEC 2011-M52 -- 2011 MK, 2011 EZ78
A27Eridanus Obs. in Germany, 1 in MPEC 2011-M52 -- 2011 EZ78
157Frasso Sabino Obs. in Italy, 5 in MPEC 2011-M52 -- 2011 MT, 2011 MK, 2011 CH71, 2003 BK47, 2003 AL73
J95Great Shefford Obs. in England, 1 in MPEC 2011-M52 -- 2011 MD
704LINEAR in New Mexico, 5 in MPEC 2011-M52 -- 2011 EZ78, 20086, 162913, 8567, 3103
J69North Obs. in England, 1 in MPEC 2011-M52 -- 2011 MD
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2011-M52 -- 136617, 5869, 5011, 4034
E03`Kevin Hills in England via RAS Obs. Victoria in Victoria, 1 in MPEC 2011-M52 -- 2011 GA55
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-M52 -- 2011 MD
510Siegen Obs. in Germany, 3 in MPEC 2011-M52 -- 2011 MD, 2011 EZ78, 2003 BK47
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2011-M52 -- 2011 MF, 2011 KW19, 2011 KQ19
I76Tesla Obs., 1 in MPEC 2011-M52 -- 2011 EZ78
H53Thompsonville Obs. in Illinois, 1 in MPEC 2011-M52 -- 1866
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2011-M52 -- 2011 LA19, 2011 KP17
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 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 MDJPL Sentry21052068-2111147.2e-05-5.82-6.260JPL: "Analysis based on 524 observations spanning 7.8033 days (2011-Jun-22.26489 to 2011-Jun-30.06817)." Diameter approximately 0.011 km. from mean, weighted H=27.4.
NEODyS16112083-209045.37e-05-6.15-6.170NEODyS: "Based on 538 optical observations (of which 85 are rejected as outliers) from 2011-06-22.266 to 2011-06-30.069."
2011 AG5JPL Sentry22402040-204755.5e-04-1.57-1.571JPL: "Analysis based on 159 observations spanning 171.10 days (2011-Jan-08.2673 to 2011-Jun-28.36902)." Diameter approximately 0.150 km. from mean, weighted H=21.8.

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 30 June '11

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

2240Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
2105Noted that JPL Sentry has updated its 2011 MD risk assessment - see above
1800Grabbed MPEC 2011-M53 - 2008 SQ7 - see above
Grabbed MPEC 2011-M54 - 2010 DP - see above
1611Noted that NEODyS has updated its 2011 MD risk assessment - see above
1500Grabbed MPEC 2011-M52 - Daily Orbit Update - see above