Contents  on 18 June '12

Asteroid/Comet Connection (A/CC) Resources:

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.

Traffic Report  on 18 June '12

Two objects reported inside ten LD

Two objects are reported to be within ten lunar distances (LD) of Earth today. 2012 LU is inbound from 8.90 to 7.99 LD and 2012 LA11 is outbound from 8.07 to 8.86 LD. No other objects are known to come within ten LD until November.

This report was generated at 1508 UTC.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Object distances are interpreted by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

Radar Astrometry  on 18 June '12

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 2209 UTC when the database was dated 18 June

NEOCP Activity  on 18 June '12

The MPC's NEO Confirmation Page has 21 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 21 objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 53 listings on the NEOCP today.

New MPECs  on 18 June '12

Minor Planet Electronic Circulars

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

MPEC 2012-M19 - "20:06 UT" - 2012 LT7 = 2009 MH1

MPEC 2012-M18 - "18:44 UT" - 2012 MQ

MPEC 2012-M17 - "18:42 UT" - 2012 MP

MPEC 2012-M16 - "18:39 UT" - 2012 LD13

MPEC 2012-M15 - "18:37 UT" - 2012 LC13

MPEC 2012-M14 - "16:42 UT" - 2006 CF

MPEC 2012-M13 - "16:40 UT" - 2005 YN3

<< DOU on 18 June '12 >>  MPEC 2012-M12 - "06:02 UT" - Daily Orbit Update

Observers  on 18 June '12

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2012-M12, 2012-M13, 2012-M14, 2012-M15, 2012-M16 & 2012-M17 -- 2012 MP, 2012 LZ1, 2012 LU7, 2012 LD13, 2012 LC13, 2006 CF, 2005 YN3
A81Balzaretto Obs. in Italy, 1 in MPEC 2012-M12 -- 153958
C77Bernezzo Obs. in Italy, 2 in MPEC 2012-M12 -- 2012 LZ1, 16960
160Castelmartini Obs. in Italy, 5 in MPEC 2012-M12 -- 2012 LZ1, 2012 DH61, 1994 NK, 329291, 329275
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2012-M12 -- 2012 KU42, 2003 MT2, 53110
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2012-M12 -- 2012 LG11
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-M12 -- 2012 LZ1
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-M16 -- 2012 LD13
E102Ernesto Guido in Italy via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-M17 -- 2012 MP
157Frasso Sabino Obs. in Italy, 1 in MPEC 2012-M12 -- 2012 LZ1
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 308242
A17Guidestar Obs. in Germany, 6 in MPEC 2012-M12 -- 2012 LZ1, 2012 LT7, 2012 LD1, 2012 BC20, 2004 CL, 317685
046Klet Obs. in the Czech Republic, 2 in MPEC 2012-M12 -- 2012 LZ1, 2012 LU7
704LINEAR in New Mexico, 5 in MPEC 2012-M12 -- 2012 LG4, 2009 KJ22, 2006 VY13, 318050, 3352
711McDonald Obs. in Texas, 1 in MPEC 2012-M16 -- 2012 LD13
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2012-M12 -- 2007 MT20, 2004 CL
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2012-M14, 2012-M15 & 2012-M17 -- 2012 MP, 2012 LC13, 2006 CF
C47Nonndorf Obs. in Austria, 2 in MPEC 2012-M12 -- 2012 LZ1, 2007 MM13
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2012-M12, 2012-M13, 2012-M16 & 2012-M18 -- 2012 MQ, 2012 LD13, 2005 YN3, 2003 BQ35, 68350, 36183
H23Pear Tree Obs. in Florida, 1 in MPEC 2012-M12 -- 2012 LZ1
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2012-M12 -- 2012 LZ1, 2012 LU7, 2012 HG31, 2011 WV134, 2007 MM13, 1994 NK
461SZTE Asteroid Program in Hungary, 2 in MPEC 2012-M12 -- 2012 LG11, 248818
H36Sandlot Obs. in Kansas, 2 in MPECs 2012-M13 & 2012-M16 -- 2012 LD13, 2005 YN3
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-M12 -- 4034
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2012-M12, 2012-M15, 2012-M16, 2012-M17 & 2012-M18 -- 2012 MQ, 2012 MP, 2012 LR1, 2012 LK9, 2012 LD13, 2012 LC13, 2012 KL11, 2012 KE25, 2012 HM1, 2012 GT5, 2012 FS62, 2012 EU14
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 June '12

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 CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2012 LK11NEODyS15072026-2081131.17e-06-3.43-3.750NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2012-06-15.365 to 2012-06-17.457."
2012 LK9JPL Sentry15072032-204053.8e-08-3.48-3.850JPL: "Analysis based on 31 observations spanning 4.9463 days (2012-Jun-12.35378 to 2012-Jun-17.30005)." Diameter approximately 1.000 km. from mean, weighted H=17.6.
NEODyS15072024-204079.66e-08-3.04-3.630NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2012-06-12.355 to 2012-06-17.301."
2012 LR1JPL Sentry15072080-210034.5e-07-3.93-3.940JPL: "Analysis based on 78 observations spanning 7.9010 days (2012-Jun-09.40456 to 2012-Jun-17.30556)." Diameter approximately 0.280 km. from mean, weighted H=20.4.
NEODyS15072074-208944.09e-07-3.98-4.00NEODyS: "Based on 78 optical observations (of which 0 are rejected as outliers) from 2012-06-09.405 to 2012-06-17.306."

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 18 June '12

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

2209Noted Radar Astrometry database update - see above
2035Grabbed MPEC 2012-M19 - 2012 LT7 = 2009 MH1 - see above
1907Grabbed MPEC 2012-M15 - 2012 LC13 - see above
Grabbed MPEC 2012-M16 - 2012 LD13 - see above
Grabbed MPEC 2012-M17 - 2012 MP - see above
Grabbed MPEC 2012-M18 - 2012 MQ - see above
1645Grabbed MPEC 2012-M13 - 2005 YN3 - see above
Grabbed MPEC 2012-M14 - 2006 CF - see above
1508Generated Traffic Report
1507Noted that NEODyS has posted 2012 LK11 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 LK9 risk assessment - see above
Noted that NEODyS has updated its 2012 LK9 risk assessment - see above
Noted that JPL Sentry has updated its 2012 LR1 risk assessment - see above
Noted that NEODyS has updated its 2012 LR1 risk assessment - see above
Grabbed MPEC 2012-M12 - Daily Orbit Update - see above