Contents  on 20 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 20 May '12

Four objects reported inside ten LD

Four visitors are reported to be inside ten lunar distances (LD) of Earth today. 2010 KK37 may be exiting Earth's Hill sphere, calculated to move from 2.6 to 4.4 LD but with an Earth passage uncertainty of +/- 1.160 days. Further out, 2012 KW is inbound from 5.42 to 3.91 LD while intruder 2012 KA leaves ten LD, moving from 7.25 to 10.47 LD, and 2012 JV11 comes inside, passing from 11.15 to 8.07 LD.

No other objects are presently known to be coming within ten LD until November.

This report was generated at 1554 UTC with follow-up in today's DOU MPEC for 2012 KW, 2012 JV11, and departed 2012 HG2.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. 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.

NEOCP Activity  on 20 May '12

The MPC's NEO Confirmation Page has 40 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 40 objects listed. Of these, seventeen were "one nighters."

New MPECs  on 20 May '12

Minor Planet Electronic Circulars

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

MPEC 2012-K28 - "14:57 UT" - 2010 XG11

MPEC 2012-K27 - "14:55 UT" - 2006 BH

<< DOU on 20 May '12 >>  MPEC 2012-K26 - "06:03 UT" - Daily Orbit Update

MPEC 2012-K25 - "00:15 UT" - 2012 KD6

MPEC 2012-K24 - "00:13 UT" - 2012 KC6

MPEC 2012-K23 - "00:11 UT" - 2012 KB6

Observers  on 20 May '12

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPECs 2012-K24 & 2012-K26 -- 2012 KW, 2012 KC6, 2012 JT17, 2012 JS17, 2012 JP4, 2012 JH11, 2012 JB16, 2012 HZ33, 2012 HP15, 2012 GD5, 2012 FM52, 2008 CD22
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2012-K24, 2012-K25 & 2012-K26 -- 2012 KD6, 2012 KC6, 2012 JO4, 2012 JB16, 2012 GX11, 2012 FE58, 2009 XG8, 2001 LB, 1999 VP6, 66272, 326732, 27002, 2062
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2012-K27 & 2012-K28 -- 2010 XG11, 2006 BH
106Crni Vrh Obs. in Slovenia, 2 in MPECs 2012-K25 & 2012-K26 -- 2012 KD6, 322775
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 3 in MPEC 2012-K26 -- 2012 KX, 2012 JV11, 2011 WV134
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-K25 -- 2012 KD6
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-K23 -- 2012 KB6
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2012-K23 & 2012-K24 -- 2012 KC6, 2012 KB6
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2012-K26 -- 2012 FE58, 2006 XG2, 66272
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPECs 2012-K23, 2012-K24 & 2012-K26 -- 2012 KC6, 2012 KB6, 2012 JR4, 2011 MW1, 2010 VY190, 2006 KV86, 1999 OQ3, 141432
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 4 in MPEC 2012-K26 -- 2012 KY3, 2012 KA4, 2012 JV11, 2012 JR17
461SZTE Asteroid Program in Hungary, 2 in MPEC 2012-K26 -- 2011 HS4, 53110
204Schiaparelli Obs. in Italy, 3 in MPECs 2012-K24 & 2012-K26 -- 2012 KW, 2012 KC6, 2012 JH11
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-K26 -- 3360
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2012-K23 & 2012-K26 -- 2012 KB6, 2012 JU11, 2012 JR17, 2012 HH31, 2012 HG2, 2010 NJ1
B18Terskol Obs. in Russia, 1 in MPEC 2012-K24 -- 2012 KC6
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2012-K26 -- 2012 KX, 2012 JB16, 141018
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 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 KD6JPL Sentry0251206216.1e-10-8.31-8.310JPL: "Analysis based on 11 observations spanning .61475 days (2012-May-19.26439 to 2012-May-19.87914)." Diameter approximately 0.078 km. from mean, weighted H=23.2.
2012 KY3JPL Sentry1553R E M O V E DJPL: Risk listing removed at 0855 UTC.
2012 JR17JPL Sentry15532075-209531.2e-08-4.52-4.690JPL: "Analysis based on 41 observations spanning 4.9888 days (2012-May-14.41872 to 2012-May-19.40751)." Diameter approximately 1.100 km. from mean, weighted H=17.4.
2012 HG2JPL Sentry15532053-205672.4e-05-5.73-5.950JPL: "Analysis based on 172 observations spanning 28.964 days (2012-Apr-20.37147 to 2012-May-19.33523)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
NEODyS15532053-20902261.15e-03-4.15-4.880NEODyS: "Based on 169 optical observations (of which 9 are rejected as outliers) from 2012-04-20.372 to 2012-05-19.336."

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 20 May '12

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

1554Generated Traffic Report
1553Noted that JPL Sentry has updated its 2012 HG2 risk assessment - see above
Noted that NEODyS has updated its 2012 HG2 risk assessment - see above
Noted that JPL Sentry has updated its 2012 JR17 risk assessment - see above
Noted that JPL Sentry has removed 2012 KY3 as an impact risk - see above
Grabbed MPEC 2012-K26 - Daily Orbit Update - see above
Grabbed MPEC 2012-K27 - 2006 BH - see above
Grabbed MPEC 2012-K28 - 2010 XG11 - see above
0251Noted that JPL Sentry has posted 2012 KD6 as an impact risk - see above
0018Grabbed MPEC 2012-K23 - 2012 KB6 - see above
Grabbed MPEC 2012-K24 - 2012 KC6 - see above
Grabbed MPEC 2012-K25 - 2012 KD6 - see above