Contents  on 4 January '12


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.

Radar Astrometry  on 4 January '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 4 Jan.

Photometry is needed for upcoming radar targets and also some astrometry. See Arecibo and Goldstone schedules.

NEOCP Activity  on 4 January '12

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of 21 listings on the NEOCP today.

New MPECs  on 4 January '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-A28 - "22:37 UT" - 2012 AC3

MPEC 2012-A27 - "20:14 UT" - 2012 AB3

MPEC 2012-A26 - "18:22 UT" - 2012 AA3

<< DOU on 4 Jan. '12 >>  MPEC 2012-A25 - "06:03 UT" - Daily Orbit Update

Observers  on 4 January '12

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 20 in MPECs 2012-A25, 2012-A26, 2012-A27 & 2012-A28 -- 2012 AC3, 2012 AB3, 2012 AA3, 2011 YY62, 2011 YW15, 2011 YV15, 2011 YT62, 2011 YL6, 2011 YJ28, 2011 YH6, 2011 YH40, 2011 YH28, 2011 YB40, 2011 YB29, 2011 YA, 2011 XE1, 2011 US63, 2011 OR15, 2010 CL19, 2004 FC32
703Catalina Sky Survey (CSS) in Arizona, 14 in MPECs 2012-A25, 2012-A27 & 2012-A28 -- 2012 AC3, 2012 AB3, 2011 LC19, 2002 AN11, 66251, 29075, 275558, 190491, 159857, 155110, 138524, 138013, 7753, 2061
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2012-A25 -- 2011 YU62
448Desert Moon Obs. in New Mexico, 5 in MPEC 2012-A25 -- 2011 YH6, 2011 YG28, 2011 YE6, 2011 AC3, 308127
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 3 in MPECs 2012-A25 & 2012-A28 -- 2012 AC3, 2011 YK6, 2011 YG28
J19El Maestrat Obs. in Spain, 2 in MPEC 2012-A25 -- 8567, 1620
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2000 YA
J95Great Shefford Obs. in England, 2 in MPECs 2012-A25 & 2012-A28 -- 2012 AC3, 2011 YL28
355Hadano Obs. in Japan, 2 in MPEC 2012-A25 -- 2006 MJ10, 2006 BA148
704LINEAR in New Mexico, 8 in MPEC 2012-A25 -- 85709, 54071, 175706, 154656, 141056, 7341, 1943, 1627
B28Mandi Obs. in Italy, 1 in MPEC 2012-A28 -- 2012 AC3
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-A25 -- 3200
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2012-A25, 2012-A26 & 2012-A28 -- 2012 AC3, 2012 AA3, 2011 XZ1, 2011 GH3, 2005 NJ1
A24New Millennium Obs. in Italy, 1 in MPEC 2012-A28 -- 2012 AC3
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2012-A25 -- 2010 CL19
B49Paus Obs. in Spain, 3 in MPECs 2012-A25 & 2012-A28 -- 2012 AC3, 2011 YH40, 2011 YA
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2012-A25 -- 2002 QG24, 25916
291Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2012-A25, 2012-A26, 2012-A27 & 2012-A28 -- 2012 AQ, 2012 AC3, 2012 AB3, 2012 AA3, 2011 YZ62, 2011 YY28, 2011 YK28, 2011 YH28, 2011 YC29, 2011 XM1, 2011 SF25, 2010 SO16, 2010 LR33
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 January '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
2011 YH28JPL Sentry18042029-207942.4e-07-4.25-4.250JPL: "Analysis based on 31 observations spanning 7.1088 days (2011-Dec-27.41812 to 2012-Jan-03.52689)." Diameter approximately 0.310 km. from mean, weighted H=20.2.
NEODyS18042029-207942.12e-07-4.30-4.30NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2011-12-27.419 to 2012-01-03.528."

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 '12

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

2359Noted Radar Astrometry database update - see above
2240Grabbed MPEC 2012-A28 - 2012 AC3 - see above
2100Grabbed MPEC 2012-A27 - 2012 AB3 - see above
1848Grabbed MPEC 2012-A26 - 2012 AA3 - see above
1804Noted that JPL Sentry has updated its 2011 YH28 risk assessment - see above
Noted that NEODyS has updated its 2011 YH28 risk assessment - see above
Grabbed MPEC 2012-A25 - Daily Orbit Update - see above