Contents  on 12 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 12 March '12

Two objects reported inside ten LD

Two asteroids are reported traveling within ten lunar distances (LD) of our planet today. Within Earth's Hill sphere, risk-listed radar target 2012 DW60 comes its closest to Earth on this passage, reaching 2.49 LD at 1440 UTC, and radar target 2012 DH54 exits the Hill sphere.

Next known to be coming our way, 2007 HV4 arrives inside ten LD on April 14th.

This report was updated at 2359 UTC with follow-up for 2012 DW60 in radar, and earlier for 2012 DH54 in both radar and today's DOU MPEC as well as for 2012 DA14 in the DOU. This report was previously updated at 1651 and 1907 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.

Radar Astrometry  on 12 March '12

Radar observation of four objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 1906 UTC when the database was dated 12 March

Data update noted at 2120 UTC when the database was dated 12 March

Data update noted at 2359 UTC when the database was dated 12 March

NEOCP Activity  on 12 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.

New MPECs  on 12 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 12 Mar. '12 >>  MPEC 2012-E48 - "06:02 UT" - Daily Orbit Update

Observers  on 12 March '12

Fifteen observers appear in today's MPEC.

CodeObserver / observatory
251Arecibo in Puerto Rico, 4 in radar -- 2012 DW60, 2012 DH54, 2006 AL8, 141018
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPEC 2012-E48 -- 2012 ER3, 2012 EQ3, 2012 EO3, 2012 EN3, 2012 EC, 2012 EB, 2012 EA2, 2012 DZ32, 2012 DW30, 2012 DV32, 2012 DQ32, 2012 DN14, 2012 DL31, 2012 DK61, 2012 DH4, 2012 DA14, 2012 CP36, 2012 CP2, 2012 CL19, 2012 BS23, 2012 BR23, 2012 BK77, 2012 BJ11, 2012 BB124, 2012 AU10, 2011 YV15, 2011 QP96, 36183
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2012-E48 -- 2012 EQ3, 2012 EO3, 2012 DO, 2012 DK61, 137427, 1580
I17Cupillari Obs. in Pennsylvania, 2 in MPEC 2012-E48 -- 275558, 163000
203GiaGa Obs. in Italy, 4 in MPEC 2012-E48 -- 2012 DH4, 2012 CA55, 2012 BJ134, 2012 AA11
J95Great Shefford Obs. in England, 5 in MPEC 2012-E48 -- 2012 EC, 2012 EB2, 2012 DT60, 2012 AN23, 2011 QD48
168Kourovskaya Obs. in Russia, 12 in MPEC 2012-E48 -- 2009 AV, 32906, 24475, 21088, 162186, 153951, 141018, 137925, 4183, 3103, 1866, 1036
C94MASTER-II Obs. Tunka in Russia, 1 in MPEC 2012-E48 -- 6455
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-E48 -- 2012 DH54
C91Montevenere Obs., 2 in MPEC 2012-E48 -- 2012 BJ134, 137925
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2012-E48 -- 85628
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-E48 -- 2012 DQ8
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2012-E48 -- 2012 CT, 2012 CP36
A78Stia Obs. in Italy, 3 in MPEC 2012-E48 -- 2012 DH4, 2012 BJ134, 2004 QJ7
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2012-E48 -- 2012 EB2, 2012 DF61, 2002 AW
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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 Sentry16512039-2107384.9e-06-5.02-5.740JPL: "Analysis based on 27 observations spanning 10.629 days (2012-Mar-01.3419 to 2012-Mar-11.97101)." Diameter approximately 0.065 km. from mean, weighted H=23.6.
NEODyS16512061-209071.42e-06-5.57-6.010NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2012-03-01.343 to 2012-03-11.972."
2012 DW60JPL Sentry23592083-2107253.0e-04-4.61-4.960JPL: "Analysis based on 2 radar Doppler and 55 optical observations spanning 8.7661 days (2012-Feb-29.49427 to 2012-Mar-09.260417)." Diameter approximately 0.017 km. from mean, weighted H=26.4.
2012 DA14JPL Sentry16512020-2044327.7e-05-3.53-3.990JPL: "Analysis based on 118 observations spanning 17.347 days (2012-Feb-23.03431 to 2012-Mar-11.381671)." Diameter approximately 0.044 km. from mean, weighted H=24.4.
NEODyS16512020-20903183.8e-04-3.13-3.890NEODyS: "Based on 118 optical observations (of which 4 are rejected as outliers) from 2012-02-23.029 to 2012-03-10.401."

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 12 March '12

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

2359Noted that JPL Sentry has updated its 2012 DW60 risk assessment - see above
Noted Radar Astrometry database update - see above
Updated Traffic Report
2120Noted Radar Astrometry database update - see above
1906Noted Radar Astrometry database update - see above
1651Noted that JPL Sentry has updated its 2012 DA14 risk assessment - see above
Noted that NEODyS has updated its 2012 DA14 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-E48 - Daily Orbit Update - see above