Contents  on 4 January '13

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 4 January '13

One object reported inside ten LD

One visitor is reported moving within ten lunar distances (LD) of our planet today. Radar target 2012 XM55 is outbound from 7.67 to 8.25 LD. Next known to be headed our way, intruder 2012 DA14 (risk-listed radar target) arrives inside ten LD on February 8th.

This report was generated at 1617 UTC with observation of distant 2011 LT17 in today's DOU MPEC.

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 4 January '13

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 53 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 4 January '13

Minor Planet Electronic Circulars

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

MPEC 2013-A13 - "18:16 UT" - 2012 YE8

<< DOU on 4 Jan. '13 >>  MPEC 2013-A12 - "06:02 UT" - Daily Orbit Update

Observers  on 4 January '13

Thirteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPECs 2013-A12 & 2013-A13 -- 2012 YO1, 2012 YE8, 2012 XP111, 2012 XK55, 2012 XF112, 2012 XE17, 2012 XC112, 2012 XA133, 2012 VJ82, 341050
C77Bernezzo Obs. in Italy, 1 in MPEC 2013-A12 -- 2002 AY1
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2013-A12 -- 2010 QD2, 349068, 229672
J27El Guijo Obs. in Spain, 2 in MPEC 2013-A12 -- 2012 XF112, 229672
D00ISON-Kislovodsk Obs., 1 in MPEC 2013-A12 -- 1916
704LINEAR in New Mexico, 4 in MPEC 2013-A12 -- 2012 XE112, 343098, 11405, 6569
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-A12 -- 2012 VK6
C91Montevenere Obs., 2 in MPEC 2013-A12 -- 256412, 3200
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2013-A12 & 2013-A13 -- 2012 YE8, 2006 OF15, 348400, 230089, 22753, 136793, 5587
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPEC 2013-A12 -- 2007 LV, 2005 EY, 1998 QR15, 68548, 229672, 4486, 1916
291Spacewatch 1.8m telescope in Arizona, 12 in MPEC 2013-A12 -- 2012 XS111, 2012 XO111, 2012 XG16, 2012 XF55, 2012 XE133, 2012 VZ36, 2012 VO6, 2012 VM82, 2012 VL6, 2012 VC82, 2012 TV78, 2011 LT17
I76Tesla Obs. in Spain, 2 in MPEC 2013-A12 -- 2012 XF112, 2010 BB
718Wiggins Obs. in Utah, 1 in MPEC 2013-A12 -- 2012 XF112
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 January '13

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 Sentry1602210619.2e-08-5.35-5.350JPL: "Analysis based on 56 observations spanning 10.937 days (2012-Dec-19.23613 to 2012-Dec-30.17265)." Diameter approximately 0.220 km. from mean, weighted H=20.9.
2012 XE133JPL Sentry16022083-211344.2e-08-6.88-7.240JPL: "Analysis based on 88 observations spanning 22.716 days (2012-Dec-12.43361 to 2013-Jan-04.1495)." Diameter approximately 0.070 km. from mean, weighted H=23.4.

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 4 January '13

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

1819Grabbed MPEC 2013-A13 - 2012 YE8 - see above
1617Generated Traffic Report
1602Noted that JPL Sentry has updated its 2012 XE133 risk assessment - see above
Noted that JPL Sentry has updated its 2012 YQ1 risk assessment - see above
Grabbed MPEC 2013-A12 - Daily Orbit Update - see above