Contents  on 31 May '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 31 May '12

Five objects reported inside ten LD

Five asteroids are reported traveling within ten lunar distances (LD) of Earth today. Newly announced 2012 KC45 is outbound from 4.58 to 5.85 LD, intruder 2012 KT42 from 6.10 to 9.68 LD, 2012 KT12 from 6.13 to 6.92 LD, and risk-listed intruder 2012 KP24 from 6.78 to 9.64 LD, while 2012 KZ41 comes its closest to Earth this time around, reaching 8.13 LD at 1926 UTC.

No other objects are known to approach to within ten LD until November.

This report was updated at 1530 UTC with follow-up in today's DOU MPEC for 2012 KT42, and earlier with the discovery of 2012 KC45 announced late yesterday (MPEC). Today's first traffic report was generated at 0442 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 31 May '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 1908 UTC when the database was dated 31 May

NEOCP Activity  on 31 May '12

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, two were "one nighters."

New MPECs  on 31 May '12

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 2012-K75 - "23:30 UT" - P/1994 X1 = 2012 K7 (McNaught-Russell)

<< DOU on 31 May '12 >>  MPEC 2012-K74 - "06:04 UT" - Daily Orbit Update

Observers  on 31 May '12

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPEC 2012-K74 -- 2012 KY3, 2012 KU42, 2012 KO18, 2012 KN18, 2012 KD6, 2012 KA4, 2012 JB16, 2012 HO15, 2012 HJ1, 2012 FM52, 2001 YP2, 220124, 216707, 206359
703Catalina Sky Survey in Arizona, 1 in MPEC 2012-K74 -- 2012 JN4
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2012-K74 -- 2012 JQ4, 2012 HK
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-K75 -- P/2012 K7
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2007 LE
704LINEAR in New Mexico, 6 in MPEC 2012-K74 -- 2012 GX11, 85628, 68359, 154007, 153958, 4341
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-K74 -- 2011 AG5
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2012-K74 -- 2011 HS4, 87311, 53110, 136900, 5869
A24New Millennium Obs. in Italy, 18 in MPEC 2012-K74 -- 2012 KX, 2012 JB16, 2012 HG31, 2007 LE, 86667, 85275, 53110, 318050, 24475, 162980, 154555, 154144, 7889, 5587, 4055, 4034, 3352, 3103
H06`Erik Bryssinck in Belgium via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-K75 -- P/2012 K7
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-K74 -- 2012 KT42
033Schwarzschild Obs. in Germany, 1 in MPEC 2012-K74 -- 2001 QN142
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-K74 -- 277142
291Spacewatch 1.8m telescope in Arizona, 10 in MPEC 2012-K74 -- 2012 KU42, 2012 KU12, 2012 KL11, 2012 KK11, 2012 KJ11, 2012 JU11, 2012 JS17, 2012 HR15, 2012 FQ1, 2010 OD101
954Teide Obs. in the Canary Islands, 1 in MPEC 2012-K74 -- 2012 JR17
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 May '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 KU42JPL Sentry1527203516.7e-09-3.88-3.880JPL: "Analysis based on 42 observations spanning 5.0248 days (2012-May-25.44054 to 2012-May-30.4653)." Diameter approximately 1.400 km. from mean, weighted H=16.9.
NEODyS15272035-208436.74e-09-4.01-4.020NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2012-05-25.441 to 2012-05-30.466."
2011 AG5JPL Sentry18002040-204742.0e-03-1.00-1.001JPL: "Analysis based on 213 observations spanning 316.77 days (2010-Nov-08.629742 to 2011-Sep-21.398727)." Diameter approximately 0.140 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 31 May '12

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

2359Grabbed MPEC 2012-K75 - P/1994 X1 = 2012 K7 (McNaught-Russell) - see above
1908Noted Radar Astrometry database update - see above
1800Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
1530Updated Traffic Report
1527Noted that JPL Sentry has updated its 2012 KU42 risk assessment - see above
Noted that NEODyS has updated its 2012 KU42 risk assessment - see above
Grabbed MPEC 2012-K74 - Daily Orbit Update - see above