Contents  on 29 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 29 May '12

Four objects reported inside ten LD

Four asteroids are reported passing within ten lunar distances (LD) of our planet today. Risk-listed intruder (and possible radar target) 2012 KT42 is inside the Earth-Moon system during 0027-1344 UT, reaching 0.05 LD at 0706 UT and also coming its closest to the Moon -- 0.94 LD at 0635 UT. Risk-listed intruder 2012 KP24 exits Earth's Hill sphere, flying from 1.06 to 3.92 LD. And further away, 2012 KT12 is outbound from 4.56 to 5.34 LD and 2012 KZ41 enters ten LD, traveling from 11.27 to 9.54 LD.

No other objects are known to approach this close until November.

This report was generated at 1610 UTC with follow-up in today's DOU MPEC for 2012 KT42, 2012 KZ41, 2012 KP24, and distant 68216 2001 CV26.

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 29 May '12

The MPC's NEO Confirmation Page has 5 listings

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

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 29 May '12

Minor Planet Electronic Circulars

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

<< DOU on 29 May '12 >>  MPEC 2012-K70 - "06:04 UT" - Daily Orbit Update

Observers  on 29 May '12

Seventeen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPEC 2012-K70 -- 2012 KX, 2012 KP24, 2012 KO18, 2012 KN18, 2012 KM18, 2012 KF25, 2012 KD6, 2012 KC6, 2012 JX11, 2012 JH11, 2012 JB16, 2012 DU30, 2012 DH61, 2009 QY33, 2008 GG2, 2006 WN3
160Castelmartini Obs. in Italy, 4 in MPEC 2012-K70 -- 2011 WV134, 1994 NK, 326732, 322966
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2012-K70 -- 2012 KP24, 2007 LE, 4179, 1685
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2012-K70 -- 2012 KT42, 2012 KO11, 2012 KM11, 2012 KL18, 2012 JW11, 2012 HN2, 2012 HL8, 2005 UJ159, 2005 UH3, 31221, 217013
448Desert Moon Obs. in New Mexico, 4 in MPEC 2012-K70 -- 2012 KE25, 2011 US63, 2006 JY25, 53110
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 4 in MPEC 2012-K70 -- 2012 KZ41, 2012 JB16, 2011 WV134, 162173
203GiaGa Obs. in Italy, 4 in MPEC 2012-K70 -- 2012 KO18, 2012 JB16, 2012 HG31, 1999 VP6
J95Great Shefford Obs. in England, 5 in MPEC 2012-K70 -- 2012 KZ41, 2012 KT42, 2012 KP24, 2012 KC6, 2012 DH61
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-K70 -- 2012 KY41
474Mt. John Obs. in New Zealand, 9 in MPEC 2012-K70 -- 2012 KT42, 2012 KO11, 2012 KF25, 2012 KE25, 2012 JW11, 2012 JQ, 2012 JM4, 2012 HC34, 2006 JY25
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPEC 2012-K70 -- 2012 KT42, 2012 KK18, 2012 KJ18, 2006 WN1, 189008, 137158
A13Naef Obs. in Switzerland, 2 in MPEC 2012-K70 -- 2012 KX, 2011 WV134
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2012-K70 -- 2012 KP24, 2011 WV134, 2007 LE, 2001 LB
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2012-K70 -- 2012 KT42, 68216
291Spacewatch 1.8m telescope in Arizona, 13 in MPEC 2012-K70 -- 2012 KN11, 2012 KK18, 2012 JG11, 2012 HR2, 2012 HM1, 2012 HK31, 2012 HD20, 2012 HB34, 2012 FR1, 2012 DG61, 2011 UT20, 2009 JR5, 2008 KP
I93St. Pardon de Conques Obs. in France, 3 in MPEC 2012-K70 -- 2012 KX, 2012 KU42, 2012 KT42
G56Walnut Creek Obs. in northern California, 2 in MPEC 2012-K70 -- 2012 KP24, 2012 JB16
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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 Sentry16072030-210835.1e-09-4.02-4.080JPL: "Analysis based on 36 observations spanning 3.6507 days (2012-May-25.44054 to 2012-May-29.09123)." Diameter approximately 1.400 km. from mean, weighted H=17.0.
NEODyS16072030-205756.09e-09-4.05-4.10NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2012-05-25.441 to 2012-05-28.472."
2012 KT42JPL Sentry1708210912.1e-07-8.72-8.720JPL: "Analysis based on 50 observations spanning .78811 days (2012-May-28.29728 to 2012-May-29.085393)." Diameter approximately 0.006 km. from mean, weighted H=28.9.
NEODyS16072059-208139.03e-08-8.88-9.180NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2012-05-28.298 to 2012-05-28.566."
2012 KP24JPL Sentry1607203211.1e-07-7.22-7.220JPL: "Analysis based on 139 observations spanning 5.0980 days (2012-May-23.33535 to 2012-May-28.43334)." Diameter approximately 0.017 km. from mean, weighted H=26.4.
NEODyS1607R E M O V E D-

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 29 May '12

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

1708Noted that JPL Sentry has updated its 2012 KT42 risk assessment - see above
1610Generated Traffic Report
1607Noted that JPL Sentry has updated its 2012 KP24 risk assessment - see above
Noted that NEODyS has removed 2012 KP24 as an impact risk - see above
Noted that NEODyS has posted 2012 KT42 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 KU42 risk assessment - see above
Noted that NEODyS has posted 2012 KU42 as an impact risk - see above
Grabbed MPEC 2012-K70 - Daily Orbit Update - see above