Contents  on 3 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 3 January '13

One object reported inside ten LD

One asteroid is reported flying inside ten lunar distances (LD) of Earth today. Radar target 2012 XM55 is outbound from 7.09 to 7.67 LD. Next known to be on approach is intruder 2012 DA14, a risk-listed radar target that arrives inside ten LD on February 8th.

This report was generated at 1631 UTC.

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 3 January '13

The MPC's NEO Confirmation Page has 48 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 48 objects listed. Of these, 29 were "one nighters." The Tracking News counted a total of 54 listings on the NEOCP on this day.

New MPECs  on 3 January '13

Minor Planet Electronic Circulars

There was one MPEC posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 3 Jan. '13 >>  MPEC 2013-A11 - "06:02 UT" - Daily Orbit Update

Observers  on 3 January '13

Thirteen observers appeared in this day's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2013-A11 -- 2012 YY6, 2012 YQ3, 2012 YO3, 2012 YO1, 2012 XT134, 2012 XG55, 2012 XF112, 2012 XE17, 2012 XD112, 2012 VJ82, 2012 TA219
160Castelmartini Obs. in Italy, 18 in MPEC 2013-A11 -- 2012 YQ1, 2012 XF112, 2012 XE112, 2012 XD112, 2012 XC112, 2000 WL63, 349068, 331509, 330825, 277127, 276397, 262623, 230111, 229672, 214869, 203471, 137805, 4179
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2013-A11 -- 2012 XE112
151Eschenberg Obs. in Switzerland, 1 in MPEC 2013-A11 -- 2012 YO3
704LINEAR in New Mexico, 11 in MPEC 2013-A11 -- 2012 TP139, 2012 RV16, 2012 MK6, 2012 HG31, 2008 SS251, 1994 NK, 86667, 341050, 277127, 154007, 141018
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2013-A11 -- 2012 QC8, 2007 LV, 163373, 10860, 4660
A13Naef Obs. in Switzerland, 1 in MPEC 2013-A11 -- 203471
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-A11 -- 2012 YD7
510Siegen Obs. in Germany, 1 in MPEC 2013-A11 -- 4179
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-A11 -- 329614
I76Tesla Obs. in Spain, 1 in MPEC 2013-A11 -- 2012 XF112
G56Walnut Creek Obs. in northern California, 1 in MPEC 2013-A11 -- 2012 XF112
Q620program code 0 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-A11 -- 1036
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 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 VZ19JPL Sentry0242210115.6e-10-9.93-9.930JPL: "Analysis based on 14 observations spanning 1.8878 days (2012-Nov-05.28485 to 2012-Nov-07.17261)." Diameter approximately 0.025 km. from mean, weighted H=25.6.
2012 UU158JPL Sentry01162042-207044.5e-06-6.27-6.370JPL: "Analysis based on 11 observations spanning 13.951 days (2012-Oct-23.505501 to 2012-Nov-06.456322)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
2012 UU68JPL Sentry0047210111.5e-08-7.29-7.290JPL: "Analysis based on 39 observations spanning 7.9405 days (2012-Oct-18.55713 to 2012-Oct-26.49767)." Diameter approximately 0.082 km. from mean, weighted H=23.1.
2012 UE34JPL Sentry01162095-211182.7e-06-5.10-5.530JPL: "Analysis based on 44 observations spanning 55.938 days (2012-Oct-18.393533 to 2012-Dec-13.331175)." Diameter approximately 0.081 km. from mean, weighted H=23.1.
2012 TC4JPL Sentry01162020-2112572.3e-05-5.44-6.340JPL: "Analysis based on 301 observations spanning 7.2807 days (2012-Oct-04.467684 to 2012-Oct-11.74842)." Diameter approximately 0.015 km. from mean, weighted H=26.7.
2012 QD8JPL Sentry00182042-205037.1e-06-3.83-4.130JPL: "Analysis based on 42 observations spanning 19.603 days (2012-Aug-17.44425 to 2012-Sep-06.04738)." Diameter approximately 0.081 km. from mean, weighted H=23.1.
2012 PB20JPL Sentry00182066-211237.3e-07-6.54-6.870JPL: "Analysis based on 46 observations spanning 56.850 days (2012-Aug-14.48153 to 2012-Oct-10.331721)." Diameter approximately 0.035 km. from mean, weighted H=24.9.
2012 PY19JPL Sentry0331207711.1e-08-9.61-9.610JPL: "Analysis based on 17 observations spanning 3.4964 days (2012-Aug-13.41357 to 2012-Aug-16.90994)." Diameter approximately 0.010 km. from mean, weighted H=27.7.

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 3 January '13

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

1602 1/4Grabbed MPEC 2013-A11 - Daily Orbit Update - see above
1631Generated Traffic Report
0331Noted that JPL Sentry has reposted 2012 PY19 as an impact risk - see above
0242Noted that JPL Sentry has posted 2012 VZ19 as an impact risk - see above
0116Noted that JPL Sentry has updated its 2012 TC4 risk assessment - see above
Noted that JPL Sentry has updated its 2012 UE34 risk assessment - see above
Noted that JPL Sentry has updated its 2012 UU158 risk assessment - see above
0047Noted that JPL Sentry has updated its 2012 UU68 risk assessment - see above
0018Noted that JPL Sentry has updated its 2012 PB20 risk assessment - see above
Noted that JPL Sentry has updated its 2012 QD8 risk assessment - see above