Contents  on 11 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 11 March '12

Four objects reported inside ten LD

There are four visitors reported passing within ten lunar distances (LD) of Earth today. Within Earth's Hill sphere, risk-listed radar target 2012 DW60 flies from 3.21 to 2.61 LD and radar target 2012 DH54 from 3.39 to 3.75 LD. Out further, 2012 EA leaves ten LD, moving from 9.06 to 10.15 LD, and 2012 EM1 exits from ten LD, traveling from 9.71 to 10.66 LD.

Next known inbound, 2007 HV4 arrives within ten LD on April 14th.

This report was posted at 1619 UTC with follow-up in today's DOU MPEC for 2012 DA14.

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 11 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.

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 11 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 11 Mar. '12 >>  MPEC 2012-E47 - "06:02 UT" - Daily Orbit Update

Observers  on 11 March '12

Nine observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 26 in MPEC 2012-E47 -- 2012 ER3, 2012 EQ3, 2012 EO3, 2012 EB, 2012 EA2, 2012 DZ32, 2012 DY32, 2012 DW30, 2012 DV32, 2012 DU30, 2012 DQ8, 2012 DL31, 2012 DK31, 2012 DJ61, 2012 DH61, 2012 DH4, 2012 DG61, 2012 DG31, 2012 DA14, 2012 CD29, 2012 CC17, 2012 BJ11, 2012 AU10, 2012 AE1, 2010 SV3, 2004 QJ7
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPEC 2012-E47 -- 2012 EO3, 2012 EB, 2011 US63, 2009 KJ, 2009 FY4, 2004 FF29, 68548, 222073, 138258, 100756
C13Como Obs. in Italy, 1 in MPEC 2012-E47 -- 2006 VY13
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 3 in MPEC 2012-E47 -- 2012 DH4, 2012 CD29, 141018
J131National Schools Obs. via the Liverpool Telescope in the Canary Islands, 1 in MPEC 2012-E47 -- 162474
560Madonna di Dossobuono Obs. in Italy, 5 in MPEC 2012-E47 -- 2012 DF61, 2012 BJ134, 2012 AA11, 2011 SL102, 2004 QJ7
B67Mirasteilas Obs. in Switzerland, 5 in MPEC 2012-E47 -- 2012 AA11, 2011 XO3, 2010 SV3, 2009 AV, 2002 AW
A13Naef Obs. in Switzerland, 4 in MPEC 2012-E47 -- 2012 EQ3, 2012 EO3, 2012 CA55, 2002 EM6
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-E47 -- 2012 DH4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 DA14JPL Sentry16172020-2042256.9e-05-3.56-4.000JPL: "Analysis based on 115 observations spanning 16.366 days (2012-Feb-23.03431 to 2012-Mar-10.400485)." 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 11 March '12

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

1619Posted Traffic Report
1617Noted that JPL Sentry has updated its 2012 DA14 risk assessment - see above
Grabbed MPEC 2012-E47 - Daily Orbit Update - see above