Contents  on 10 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 10 March '12

Four objects reported inside ten LD

Four asteroids are reported inside ten lunar distances (LD) of Earth today. Risk-listed radar target 2012 DW60 enters Earth's Hill sphere and, within the Hill sphere, radar target 2012 DH54 comes its closest this time around, reaching 3.32 LD at 0903 UTC. Further out, 2012 EA is headed from 7.98 to 9.06 LD and 2012 EM1 from 8.89 to 9.71 LD.

Approaching our neighborhood next, 2007 HV4 arrives inside ten LD on April 14th.

This report was posted at 1401 UTC.

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.

NEOCP Activity  on 10 March '12

The MPC's NEO Confirmation Page has 1 listing

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one object listed. So far The Tracking News has counted a total of two 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 10 March '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-E46 - "17:38 UT" - 1999 DJ3

<< DOU on 10 Mar. '12 >>  MPEC 2012-E45 - "06:02 UT" - Daily Orbit Update

Observers  on 10 March '12

Twelve observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPECs 2012-E45 & 2012-E46 -- 2012 EO3, 2012 EA2, 2012 DY32, 2012 DG61, 2012 CC17, 2012 BT23, 2012 AA11, 2011 SL102, 1999 DJ3, 29075
J51Atlante Obs. in the Canary Islands, 3 in MPEC 2012-E45 -- 2012 BJ134, 24475, 141018
B75Betelgeuse Station in Italy, 3 in MPEC 2012-E45 -- 2012 DH4, 2012 BJ134, 2012 BC20
B88Bigmuskie Obs. in Italy, 1 in MPEC 2012-E45 -- 2012 DF61
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPEC 2012-E45 -- 2012 EB, 2011 UU106, 2010 LJ14, 2009 WD106, 2009 CQ5, 2000 GS146, 85275, 85184, 162422, 154347, 138095, 1685
719Etscorn Obs. in New Mexico, 2 in MPEC 2012-E45 -- 3103, 1036
C73Galati Obs. in Romania, 1 in MPEC 2012-E45 -- 2012 DH4
704LINEAR in New Mexico, 1 in MPEC 2012-E45 -- 317643
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2012-E46 -- 1999 DJ3
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2012-E45 -- 2012 DW30, 2011 AG5
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 5 in MPEC 2012-E45 -- 2012 EB, 2012 DQ8, 2012 DO, 2012 DH4, 2012 CA55
204Schiaparelli Obs. in Italy, 1 in MPEC 2012-E46 -- 1999 DJ3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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 DG61JPL Sentry1400R E M O V E DJPL: Risk listing removed at 0849 UTC.
2011 AG5JPL Sentry19022040-204752.0e-03-1.01-1.011JPL: "Analysis based on 209 observations spanning 316.77 days (2010-Nov-08.629742 to 2011-Sep-21.398727)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
NEODyS14002040-205192.08e-03-1.01-1.011NEODyS: "Based on 209 optical observations (of which 0 are rejected as outliers) from 2010-11-08.631 to 2011-09-21.399."

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 10 March '12

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

1902Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
Noted that the NEOCP has become active
1751Grabbed MPEC 2012-E46 - 1999 DJ3 - see above
Noted that the NEOCP has become empty
1401Posted Traffic Report
1400Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has removed 2012 DG61 as an impact risk - see above
Grabbed MPEC 2012-E45 - Daily Orbit Update - see above