Radar imagery of 192642 1999 RD32 
from NASA/JPL Goldstone March 9th.

Radar imagery of 192642 1999 RD32 from March 9th from NASA/JPL Goldstone. The radar planning page, which has additional imagery, reports that this object of possible cometary origin "is a very large (~5 km diameter), slow rotator... The delay-Doppler images are clearly showing two lobes [and this may be] a binary or a contact binary asteroid." Credit: NASA/JPL Goldstone.

Contents  on 13 March '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 13 March '12

Two objects reported inside ten LD

Two objects are reported to be inside ten lunar distances (LD) of Earth today. Risk-listed radar target 2012 DW60 is outbound from 2.54 to 3.04 LD within Earth's Hill sphere and radar target 2012 DH54 is moving away from 4.35 to 5.10 LD.

Coming toward Earth next, 2007 HV4 arrives inside ten LD on April 14th.

This report was posted at 1627 UTC with follow-up in today's DOU MPEC for 2012 DW60 and 2012 DA14.

We also note the radar astrometry posted early today from 31 October 2010, the day before tiny 2010 UM7's closest approach (4.57 LD) and starting from an October 29th discovery and 31 optical observations from five locations spanning only 1.1000 days. See timeline for more details.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. Distances are interpreted by A/CC from JPL Horizons data. See also today's timeline, current sky chart and object details (alt-details), and ephemerides.

Radar Astrometry  on 13 March '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 0106 UTC when the database was dated 12 March

NEOCP Activity  on 13 March '12

The MPC's NEO Confirmation Page has 12 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had twelve objects listed. Of these, seven were "one nighters."

New MPECs  on 13 March '12

Minor Planet Electronic Circulars

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

<< DOU on 13 Mar. '12 >>  MPEC 2012-E49 - "06:02 UT" - Daily Orbit Update

Observers  on 13 March '12

A total of 23 observers appear in today's MPEC.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2010 UM7
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2012-E49 -- 2012 ER3, 2012 EN3, 2012 DG31, 2012 AN23, 2011 YV15
B88Bigmuskie Obs. in Italy, 1 in MPEC 2012-E49 -- 2012 BJ134
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-E49 -- 2011 QD48
G51Byrne Obs. in southern California, 1 in MPEC 2012-E49 -- 1999 DJ3
160Castelmartini Obs. in Italy, 4 in MPEC 2012-E49 -- 2012 BJ134, 2012 AA11, 2011 XO3, 2011 WV134
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2012-E49 -- 2012 EB, 2012 CP36, 164201
C81Dolomites Obs. in Italy, 1 in MPEC 2012-E49 -- 2011 SL102
J19El Maestrat Obs. in Spain, 3 in MPEC 2012-E49 -- 141018, 6455, 5587
151Eschenberg Obs. in Switzerland, 1 in MPEC 2012-E49 -- 2012 CA55
704LINEAR in New Mexico, 3 in MPEC 2012-E49 -- 2012 BC20, 155336, 1620
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPEC 2012-E49 -- 2012 EC, 2012 DW60, 2012 DA14
C91Montevenere Obs., 4 in MPEC 2012-E49 -- 2012 BJ134, 21088, 4055, 1620
A13Naef Obs. in Switzerland, 1 in MPEC 2012-E49 -- 2009 QE8
A24New Millennium Obs. in Italy, 1 in MPEC 2012-E49 -- 6455
J69North Obs. in England, 2 in MPEC 2012-E49 -- 2012 DN14, 192642
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2012-E49 -- 3554
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2012-E49 -- 2012 BJ134, 143651
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-E49 -- 2012 EC
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-E49 -- 136618
291Spacewatch 1.8m telescope in Arizona, 19 in MPEC 2012-E49 -- 2012 EC, 2012 DY43, 2012 DX75, 2012 DV32, 2012 DT60, 2012 DT32, 2012 DP8, 2012 DO8, 2012 DN, 2012 DL31, 2012 DK61, 2012 DJ4, 2012 DG4, 2012 DA33, 2012 CQ36, 2012 CM29, 2012 CL29, 2012 BD124, 2012 BB77
C36Starry Wanderer Obs., 1 in MPEC 2012-E49 -- 2012 DH4
A78Stia Obs. in Italy, 2 in MPEC 2012-E49 -- 2012 DH4, 4055
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 March '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 ECJPL Sentry16262068-2107265.0e-06-5.03-5.670JPL: "Analysis based on 41 observations spanning 11.816 days (2012-Mar-01.3419 to 2012-Mar-13.15763)." Diameter approximately 0.065 km. from mean, weighted H=23.6.
NEODyS16262073-208743.82e-07-6.09-6.330NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2012-03-01.343 to 2012-03-13.158."
2012 DW60JPL Sentry16262083-2104121.6e-04-4.87-5.120JPL: "Analysis based on 2 radar Doppler and 59 optical observations spanning 11.908 days (2012-Feb-29.49427 to 2012-Mar-12.4021)." Diameter approximately 0.017 km. from mean, weighted H=26.5.
NEODyS16262083-2090121.64e-04-4.84-5.250NEODyS: "Based on 64 optical observations (of which 0 are rejected as outliers) from 2012-02-29.495 to 2012-03-12.403."
2012 DA14JPL Sentry16262020-20571232.2e-04-3.27-3.940JPL: "Analysis based on 122 observations spanning 18.288 days (2012-Feb-23.03431 to 2012-Mar-12.32229)." Diameter approximately 0.044 km. from mean, weighted H=24.4.

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 13 March '12

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

1627Posted Traffic Report
1626Noted that JPL Sentry has updated its 2012 DA14 risk assessment - see above
Noted that JPL Sentry has updated its 2012 DW60 risk assessment - see above
Noted that NEODyS has updated its 2012 DW60 risk assessment - see above
Noted that JPL Sentry has updated its 2012 EC risk assessment - see above
Noted that NEODyS has updated its 2012 EC risk assessment - see above
Grabbed MPEC 2012-E49 - Daily Orbit Update - see above
0106Noted Radar Astrometry database update - see above