Contents  on 30 December '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 December '12

One object reported inside ten LD

There is one object reported moving inside ten lunar distances (LD) of our planet today. Radar target 2012 XM55 is outbound from 4.93 to 5.44 LD. No other object is known to be approaching ten LD until intruder 2012 DA14 (risk-listed radar target) arrives on February 8th.

This report was generated at 1657 UTC with observations of large radar target 2012 QG42 from September in today's DOU MPEC (581 astrometric positions from an eight-day period).

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.

NEOCP Activity  on 30 December '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, eight 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 30 December '12

Minor Planet Electronic Circulars

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

MPEC 2012-Y40 - "19:42 UT" - 2012 VJ82

MPEC 2012-Y39 - "17:03 UT" - Comet P/2012 T7 (Vorobjov)

<< DOU on 30 Dec. '12 >>  MPEC 2012-Y38 - "06:01 UT" - Daily Orbit Update

Observers  on 30 December '12

Twelve observers appear in today's MPECs.

CodeObserver / observatory
160Castelmartini Obs. in Italy, 3 in MPEC 2012-Y38 -- 2012 YO1, 2010 BB, 323179
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 13 in MPEC 2012-Y38 -- 2012 XQ93, 2012 XD133, 2012 PP28, 2010 TK7, 2010 BB, 2003 XV10, 2003 XE, 2003 TJ2, 331769, 23714, 198856, 10563, 5604
448Desert Moon Obs. in New Mexico, 8 in MPEC 2012-Y38 -- 2012 YO1, 2012 XH55, 2012 XE17, 2008 RE80, 87024, 333358, 276397, 159533
J95Great Shefford Obs. in England, 2 in MPEC 2012-Y38 -- 2012 XE133, 2010 BB
C40Kuban State Univ. Obs. in Russia, 1 in MPEC 2012-Y38 -- 2012 QG42
560Madonna di Dossobuono Obs. in Italy, 1 in MPEC 2012-Y38 -- 2012 TJ146
118Modra Obs. in Slovakia, 2 in MPEC 2012-Y38 -- 2012 YQ1, 2012 XD112
C91Montevenere Obs., 4 in MPEC 2012-Y38 -- 2010 BB, 17188, 11066, 5646
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2012-Y39 -- P/2012 T7
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2012-Y40 -- 2012 VJ82
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2012-Y39 -- P/2012 T7
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPEC 2012-Y38 -- 2008 RE80, 87024, 52762, 34613, 338049, 330825, 313809, 153306, 144411, 136795, 6569, 5646, 1036
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 December '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 YQ1JPL Sentry1655210619.4e-08-5.33-5.330JPL: "Analysis based on 53 observations spanning 10.903 days (2012-Dec-19.23613 to 2012-Dec-30.13895)." Diameter approximately 0.220 km. from mean, weighted H=20.9.
2012 XE133JPL Sentry16552083-209135.0e-08-6.78-7.110JPL: "Analysis based on 85 observations spanning 17.408 days (2012-Dec-12.43361 to 2012-Dec-29.84194)." Diameter approximately 0.069 km. from mean, weighted H=23.4.
NEODyS1655R 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 30 December '12

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

2016Grabbed MPEC 2012-Y39 - Comet P/2012 T7 (Vorobjov) - see above
Grabbed MPEC 2012-Y40 - 2012 VJ82 - see above
1657Generated Traffic Report
1655Noted that JPL Sentry has updated its 2012 XE133 risk assessment - see above
Noted that NEODyS has removed 2012 XE133 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 YQ1 risk assessment - see above
Grabbed MPEC 2012-Y38 - Daily Orbit Update - see above