Contents  on 29 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 29 December '12

One object reported inside ten LD

One asteroid is reported flying within ten lunar distances (LD) of our planet today. Radar target 2012 XM55 is outbound from 4.45 to 4.93 LD. Next known to be coming our way, intruder 2012 DA14 (risk-listed radar target) arrives inside ten LD on February 8th.

This report was generated at 1625 UTC with follow-up in today's DOU MPEC for departed objects 2012 XO134, 2012 XJ134, and, from the 14th, 2012 XL16.

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 29 December '12

The MPC's NEO Confirmation Page has 17 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seventeen objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 25 listings on the NEOCP today.

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 December '12

Minor Planet Electronic Circulars

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

MPEC 2012-Y37 - "17:51 UT" - 2012 YP6

MPEC 2012-Y36 - "17:48 UT" - 2012 YO6

MPEC 2012-Y35 - "17:45 UT" - 2012 YN6

<< DOU on 29 Dec. '12 >>  MPEC 2012-Y34 - "06:02 UT" - Daily Orbit Update

Observers  on 29 December '12

Thirteen observers appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 2 in MPEC 2012-Y34 -- 2012 YO3, 2012 YO1
160Castelmartini Obs. in Italy, 3 in MPEC 2012-Y34 -- 2012 VF37, 2012 TJ146, 2010 BB
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 31 in MPECs 2012-Y34, 2012-Y35, 2012-Y36 & 2012-Y37 -- 2012 YQ1, 2012 YP6, 2012 YO6, 2012 YN6, 2012 XZ6, 2012 XR93, 2012 XQ55, 2012 XO134, 2012 XM145, 2012 XK112, 2012 XJ134, 2012 XH55, 2012 XF17, 2012 XE112, 2012 XD55, 2012 XD133, 2012 XD112, 2012 XC55, 2012 XA, 2012 VV93, 2012 VJ82, 2012 SA22, 2012 PW, 2012 PP28, 2009 SC15, 2009 AV, 2008 RE80, 1999 HA2, 88213, 212359, 140039
448Desert Moon Obs. in New Mexico, 3 in MPEC 2012-Y34 -- 2012 XS134, 331769, 276397
J27El Guijo Obs. in Spain, 1 in MPEC 2012-Y34 -- 2000 WL63
F658David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 2 in MPEC 2012-Y34 -- 2012 XE133, 2012 TY79
C41MASTER-II Obs. Kislovodsk in Russia, 1 in MPEC 2012-Y34 -- 3554
560Madonna di Dossobuono Obs. in Italy, 3 in MPEC 2012-Y34 -- 2012 YO1, 2010 BB, 2004 YC5
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPEC 2012-Y34 -- 2012 XL16, 2012 XK112, 2012 XJ16
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2012-Y35, 2012-Y36 & 2012-Y37 -- 2012 YP6, 2012 YO6, 2012 YN6
A24New Millennium Obs. in Italy, 38 in MPEC 2012-Y34 -- 2012 VF37, 2012 TA79, 2012 TA219, 2012 SA59, 2012 HJ1, 2008 XE2, 2008 AV28, 2006 WR127, 2001 YM2, 2000 WL63, 1994 XD, 68548, 333358, 330825, 329338, 277127, 276397, 256412, 192563, 189173, 18882, 17188, 17182, 162679, 162004, 159533, 153958, 152742, 144411, 141052, 137199, 137052, 12538, 5646, 3908, 3360, 3200, 2212
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2012-Y35, 2012-Y36 & 2012-Y37 -- 2012 YP6, 2012 YO6, 2012 YN6
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-Y34 -- 10115
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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 Sentry1624210612.3e-07-4.94-4.940JPL: "Analysis based on 49 observations spanning 6.0444 days (2012-Dec-19.23613 to 2012-Dec-25.28052)." Diameter approximately 0.220 km. from mean, weighted H=20.9.
2012 XE133JPL Sentry16242083-209135.7e-08-6.73-7.060JPL: "Analysis based on 83 observations spanning 14.841 days (2012-Dec-12.43361 to 2012-Dec-27.274449)." Diameter approximately 0.069 km. from mean, weighted H=23.5.
NEODyS16242083-209132.44e-08-7.10-7.450NEODyS: "Based on 83 optical observations (of which 0 are rejected as outliers) from 2012-12-12.434 to 2012-12-27.275."

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 December '12

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

1802Grabbed MPEC 2012-Y35 - 2012 YN6 - see above
Grabbed MPEC 2012-Y36 - 2012 YO6 - see above
Grabbed MPEC 2012-Y37 - 2012 YP6 - see above
1625Generated Traffic Report
1624Noted that JPL Sentry has updated its 2012 XE133 risk assessment - see above
Noted that NEODyS has updated its 2012 XE133 risk assessment - see above
Noted that JPL Sentry has updated its 2012 YQ1 risk assessment - see above
Grabbed MPEC 2012-Y34 - Daily Orbit Update - see above