Contents  on 28 November '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 28 November '12

Three objects reported inside ten LD

There are three asteroids reported moving within ten lunar distances (LD) of our planet today. 2012 WH1 is inbound from 8.04 to 7.66 LD, risk-listed 2012 WR10 is outbound from 7.90 to 8.57 LD, and radar target 2010 JK1 exits ten LD, traveling from 9.67 to 10.09 LD.

Approaching next, 2009 BS5 arrives inside ten LD on December 7th.

This report was generated at 1658 UTC with follow-up in today's DOU MPEC for departed risk-listed 2012 WS3.

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.

Radar Astrometry  on 28 November '12

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 2359 UTC when the database was dated 28 Nov.

NEOCP Activity  on 28 November '12

The MPC's NEO Confirmation Page has 7 listings

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

New MPECs  on 28 November '12

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 2012-W56 - "18:12 UT" - 2012 WG32

<< DOU on 28 Nov. '12 >>  MPEC 2012-W55 - "06:05 UT" - Daily Orbit Update

Observers  on 28 November '12

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2009 LS
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2012-W56 -- 2012 WG32
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 25 in MPEC 2012-W55 -- 2012 WP3, 2012 WL4, 2012 VC5, 2012 TF53, 2012 ST9, 2012 SA22, 2012 QP10, 2012 QF42, 2012 QE50, 2012 HG31, 2005 WD, 2004 XN14, 2004 KK17, 2000 RD53, 2000 AD6, 88959, 313809, 232368, 229672, 203471, 192563, 173561, 162825, 159635, 136635
822Cordoba Obs. in Argentina, 1 in MPEC 2012-W55 -- 87684
448Desert Moon Obs. in New Mexico, 5 in MPEC 2012-W55 -- 68548, 331963, 285540, 237442, 136773
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2012-W55 -- 2004 XN14
C01Lohrmann Obs. in Germany, 1 in MPEC 2012-W55 -- 162679
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-W55 -- 2012 WS3
711McDonald Obs. in Texas, 1 in MPEC 2012-W56 -- 2012 WG32
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2012-W55 & 2012-W56 -- 2012 WG32, 199145
583Odessa-Mayaki Obs. in the Ukraine, 1 in MPEC 2012-W55 -- 214869
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2012-W56 -- 2012 WG32
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-W55 -- 2012 WP3
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-W56 -- 2012 WG32
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2012-W56 -- 2012 WG32
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 November '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 WS3JPL Sentry16552065-208061.1e-06-6.58-6.680JPL: "Analysis based on 46 observations spanning 6.2061 days (2012-Nov-20.32726 to 2012-Nov-26.533341)." Diameter approximately 0.022 km. from mean, weighted H=25.9.
NEODyS16552082-2100162.33e-06-6.36-6.960NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2012-11-20.328 to 2012-11-26.534."

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 28 November '12

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

2359Noted Radar Astrometry database update - see above
2004Grabbed MPEC 2012-W56 - 2012 WG32 - see above
1658Generated Traffic Report
1655Noted that JPL Sentry has updated its 2012 WS3 risk assessment - see above
Noted that NEODyS has updated its 2012 WS3 risk assessment - see above
Grabbed MPEC 2012-W55 - Daily Orbit Update - see above