Contents  on 30 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 30 May '12

Four objects reported inside ten LD

There are four objects reported to be within ten lunar distances (LD) of Earth today. Intruder 2012 KT42 exits Earth's Hill sphere, flying from 2.53 to 6.10 LD. Starting the day further out, risk-listed intruder 2012 KP24 is outbound from 3.92 to 6.78 LD and 2012 KT12 from 5.34 to 6.13 LD while 2012 KZ41 is inbound from 9.57 to 8.44 LD.

Coming our way next, there is nothing known until November.

This report was generated at 1625 UTC with follow-up in today's DOU MPEC for 2012 KT42 and distant 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 30 May '12

The MPC's NEO Confirmation Page has 11 listings

When last checked at 2355 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eleven objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of fourteen listings on the NEOCP today.

New MPECs  on 30 May '12

Minor Planet Electronic Circulars

As of last check at 2345 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-K73 - "23:43 UT" - 2012 KC45

MPEC 2012-K72 - "20:58 UT" - Comet C/2012 K6 (McNaught)

<< DOU on 30 May '12 >>  MPEC 2012-K71 - "06:04 UT" - Daily Orbit Update

Observers  on 30 May '12

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPEC 2012-K71 -- 2012 KX, 2012 KO18, 2012 KL11
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2012-K71 -- 2012 KT42, 2012 JR17, 20460, 16960, 10302, 7889
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2012-K72 -- C/2012 K6
448Desert Moon Obs. in New Mexico, 3 in MPEC 2012-K71 -- 326683, 154144, 152964
I48El Catalejo Obs. in Argentina, 1 in MPEC 2012-K72 -- C/2012 K6
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-K71 -- 2011 YU74
474Mt. John Obs. in New Zealand, 1 in MPEC 2012-K72 -- C/2012 K6
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2012-K71 & 2012-K73 -- 2012 KT42, 2012 KC45, 2012 JR17
A13Naef Obs. in Switzerland, 1 in MPEC 2012-K71 -- 2012 FE58
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2012-K71 -- 2012 HG31
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-K71 -- 2006 JY25
033Schwarzschild Obs. in Germany, 1 in MPEC 2012-K71 -- 2012 KN18
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-K72 -- C/2012 K6
510Siegen Obs. in Germany, 1 in MPEC 2012-K71 -- 141018
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2012-K71 -- 2012 HG31, 312473, 24445
291Spacewatch 1.8m telescope in Arizona, 16 in MPEC 2012-K71 -- 2012 KY41, 2012 KU12, 2012 KN11, 2012 KM18, 2012 KK18, 2012 KJ18, 2012 KJ11, 2012 KB4, 2012 JS17, 2012 HQ2, 2012 HG2, 2012 GV11, 2010 OS22, 2010 OD101, 2010 NJ1, 2008 KP
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2012-K71 -- 2011 WV134
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 May '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: JPL at 2346 and NEODyS at 2345 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 KT42NEODyS1621R E M O V E D-
JPL Sentry1621R E M O V E DJPL: Risk listing removed at 0855 UTC.
2012 HG2JPL Sentry16212053-2057103.8e-05-5.53-5.890JPL: "Analysis based on 205 observations spanning 38.978 days (2012-Apr-20.37147 to 2012-May-29.3498)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
NEODyS16212053-20901981.25e-03-4.11-4.780NEODyS: "Based on 202 optical observations (of which 9 are rejected as outliers) from 2012-04-20.372 to 2012-05-29.351."

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 30 May '12

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

2345Grabbed MPEC 2012-K73 - 2012 KC45 - see above
2115Grabbed MPEC 2012-K72 - Comet C/2012 K6 (McNaught) - see above
1625Generated Traffic Report
1621Noted 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 removed 2012 KT42 as an impact risk - see above
Noted that NEODyS has removed 2012 KT42 as an impact risk - see above
Grabbed MPEC 2012-K71 - Daily Orbit Update - see above