Contents  on 7 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 7 March '12

Five objects reported inside ten LD

Five asteroids are reported traveling within ten lunar distances (LD) of our planet today. Radar target 2012 DH54 moves from 4.91 to 4.19 LD, 2012 EA from 4.88 to 5.87 LD, risk-listed radar target 2012 DW60 from 7.48 to 6.31 LD, 2012 EM1 from 7.63 to 7.81 LD, and returned but unobserved 2008 EJ85 from 9.1 to 9.3 LD*.

Next up, 2007 HV4 arrives inside ten LD on April 14th.

This report was posted at 1657 UTC with follow-up in today's DOU MPEC for 2012 EA and departed risk-listed 2012 DA14.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Distances are interpreted by A/CC from JPL Horizons data. "LD*" indicates some passage uncertainty. See also today's timeline, current sky chart and object details (alt-details), and ephemerides.

NEOCP Activity  on 7 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 7 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 7 Mar. '12 >>  MPEC 2012-E41 - "06:04 UT" - Daily Orbit Update

Observers  on 7 March '12

Ten observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2012-E41 -- 2012 EQ3, 2012 EA2, 2012 DW32, 2012 DK31, 2012 DH4, 2012 DF61, 2012 BT23, 2011 XO3, 2011 QF14, 2009 AM15, 29075
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPEC 2012-E41 -- 2012 EQ3, 2012 EN3, 2012 EA, 2012 DO8, 2012 BC124, 2011 XO3, 2011 QF14
J95Great Shefford Obs. in England, 1 in MPEC 2012-E41 -- 2012 DA14
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-E41 -- 2012 DA14
704LINEAR in New Mexico, 2 in MPEC 2012-E41 -- 2012 CD29, 2004 QJ7
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2012-E41 -- 1866
A24New Millennium Obs. in Italy, 19 in MPEC 2012-E41 -- 2012 BJ134, 2008 PF1, 85990, 313548, 275558, 237805, 21277, 163000, 162038, 153951, 152941, 142348, 141018, 137925, 101873, 6050, 4055, 3103, 1862
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2012-E41 -- 2011 AG5
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2012-E41 -- 2012 BC20, 2011 YV15, 2011 XO3, 2011 WV134, 2006 VY13, 89959
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2012-E41 -- 3554
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 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 DA14NEODyS16562020-20903363.8e-04-3.12-3.860NEODyS: "Based on 109 optical observations (of which 3 are rejected as outliers) from 2012-02-23.029 to 2012-03-05.454."
2011 AG5NEODyS16562040-206591.82e-03-1.07-1.071NEODyS: "Based on 201 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 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 7 March '12

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

1657Posted Traffic Report
1656Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that NEODyS has updated its 2012 DA14 risk assessment - see above
Grabbed MPEC 2012-E41 - Daily Orbit Update - see above