Contents  on 22 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 22 June '11

The MPC's NEO Confirmation Page has 12 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had twelve objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of fourteen 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 22 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-M21 - "23:51 UT" - 2011 MC

MPEC 2011-M20 - "14:53 UT" - 2008 RP108

<< DOU on 22 June '11 >>  MPEC 2011-M19 - "07:06 UT" - Daily Orbit Update

Observers  on 22 June '11

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2011-M19 -- 2011 LJ20, 2011 LJ1, 2011 LD1, 2011 LC19, 2011 LA19, 2011 KQ19, 2011 KN9, 2011 KN17, 2011 HL7, 2011 GC, 2011 FB29, 2007 RT9
A81Balzaretto Obs. in Italy, 1 in MPEC 2011-M21 -- 2011 MC
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-M21 -- 2011 MC
I99Blanquita Obs. in Spain, 1 in MPEC 2011-M21 -- 2011 MC
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2011-M19 & 2011-M21 -- 2011 MC, 2010 XO56, 7889, 1866
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2011-M19 & 2011-M21 -- 2011 MC, 2010 XO56
J95Great Shefford Obs. in England, 1 in MPEC 2011-M21 -- 2011 MC
704LINEAR in New Mexico, 1 in MPEC 2011-M19 -- 163250
118Modra Obs. in Slovakia, 1 in MPEC 2011-M21 -- 2011 MC
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2011-M20 -- 2008 RP108
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 2 in MPECs 2011-M19 & 2011-M21 -- 2011 MC, 2011 HO
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2011-M21 -- 2011 MC
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2011-M19 & 2011-M21 -- 2011 MC, 2010 XO56
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-M21 -- 2011 MC
B38Santa Mama Obs. in Italy, 3 in MPEC 2011-M19 -- 2011 LA19, 2011 JP29, 2008 HE
204Schiaparelli Obs. in Italy, 4 in MPECs 2011-M19 & 2011-M21 -- 2011 MC, 2011 KO17, 2003 LG, 2003 AL73
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-M20 -- 2008 RP108
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-M19 -- 7889
291Spacewatch 1.8m telescope in Arizona, 13 in MPEC 2011-M19 -- 2011 LK19, 2011 LJ19, 2011 LH21, 2011 KW19, 2011 KQ19, 2011 KN17, 2011 KH4, 2011 KE3, 2011 KD11, 2011 ED78, 2010 CN1, 2006 SL198, 2002 OA22
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-M19 -- 163902
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2011-M21 -- 2011 MC
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 LJ19JPL Sentry1516210313.3e-07-4.96-4.960JPL: "Analysis based on 22 observations spanning 13.030 days (2011-Jun-09.22872 to 2011-Jun-22.25917)." Diameter approximately 0.190 km. from mean, weighted H=21.3.
2011 KN17JPL Sentry1516R E M O V E DJPL: Risk listing removed at 0951 UTC.

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 22 June '11

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

2359Grabbed MPEC 2011-M21 - 2011 MC - see above
1516Noted that JPL Sentry has removed 2011 KN17 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 LJ19 risk assessment - see above
Grabbed MPEC 2011-M19 - Daily Orbit Update - see above
Grabbed MPEC 2011-M20 - 2008 RP108 - see above