Contents  on 6 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 6 March '12

Five objects reported inside ten LD

Five objects are reported traveling inside ten lunar distances (LD) of our planet today. 2012 EA is outbound from 3.96 to 4.88 LD, radar target 2012 DH54 from 5.75 to 4.91 LD, and risk-listed radar target 2012 DW60 from 8.68 to 7.48 LD. 2012 EM1 comes its closest to Earth this time around, reaching 7.62 LD at 2016 UTC, and returned but unobserved 2008 EJ85 is calculated to come its closest on this passage -- 9.1 LD at 2227 UTC (uncertainty: 8.7833 hours).

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

This report was posted at 1628 UTC with follow-up in today's DOU MPEC for 2012 DW60, 2012 DH54, 2012 DN31, and 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. See also today's timeline, current sky chart and object details (alt-details), and ephemerides.

NEOCP Activity  on 6 March '12

The MPC's NEO Confirmation Page has 2 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two objects listed. Of these, one was a "one nighter."

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 6 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 6 Mar. '12 >>  MPEC 2012-E40 - "06:04 UT" - Daily Orbit Update

Observers  on 6 March '12

Eighteen observers appear in today's MPEC.

CodeObserver / observatory
J51Atlante Obs. in the Canary Islands, 2 in MPEC 2012-E40 -- 2012 BJ134, 141018
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2012-E40 -- 2012 ER3, 2012 EQ3, 2012 EN3, 2012 DW30, 2012 DG31, 2011 XE1
448Desert Moon Obs. in New Mexico, 3 in MPEC 2012-E40 -- 294739, 231937, 138155
C73Galati Obs. in Romania, 5 in MPEC 2012-E40 -- 2012 BJ134, 24475, 141018, 3103, 1866
J95Great Shefford Obs. in England, 2 in MPEC 2012-E40 -- 2012 ES3, 2012 DW60
J37Huelva Obs. in Spain, 3 in MPEC 2012-E40 -- 2011 YV15, 5587, 3352
585Kiev Comet Station in the Ukraine, 2 in MPEC 2012-E40 -- 5587, 3554
C01Lohrmann Obs. in Germany, 1 in MPEC 2012-E40 -- 312942
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPEC 2012-E40 -- 2012 EC, 2012 DG61, 2012 DA14, 101955
A24New Millennium Obs. in Italy, 27 in MPEC 2012-E40 -- 2012 AA11, 2011 XO3, 2011 WV134, 2006 AL8, 85839, 32906, 313548, 311554, 29075, 24475, 21088, 209924, 162186, 162038, 154269, 153951, 143651, 142348, 141018, 138524, 138013, 137805, 8567, 6050, 1627, 1620, 1036
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2012-E40 -- 2012 DN31, 2012 BC20, 2011 YV15, 2010 SV3, 263976, 3352
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-E40 -- 2012 EQ3
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2012-E40 -- 99942
H36Sandlot Obs. in Kansas, 3 in MPEC 2012-E40 -- 2012 DW60, 2012 DH54, 2012 DA14
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2012-E40 -- 2012 DK61, 2011 YV15, 2007 UR3, 18109
291Spacewatch 1.8m telescope in Arizona, 27 in MPEC 2012-E40 -- 2012 EC, 2012 EB2, 2012 DY43, 2012 DX43, 2012 DV32, 2012 DP8, 2012 DO8, 2012 DN, 2012 DM4, 2012 DL31, 2012 DK61, 2012 DJ61, 2012 DH61, 2012 DE61, 2012 DE31, 2012 DA33, 2012 CR45, 2012 CM29, 2012 CL29, 2012 BN11, 2012 BD27, 2010 LR33, 2010 LM68, 2010 FQ, 2008 HY37, 2006 XG2, 2004 VB
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2012-E40 -- 6455
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2012-E40 -- 2012 CD29, 2012 BT23, 2012 AA11
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 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 EB2JPL Sentry1627R E M O V E DJPL: Risk listing removed at 1029 UTC.
NEODyS1627R E M O V E D-
2012 ECJPL Sentry16272030-2111531.6e-06-5.09-5.450JPL: "Analysis based on 23 observations spanning 4.0347 days (2012-Mar-01.3419 to 2012-Mar-05.37655)." Diameter approximately 0.065 km. from mean, weighted H=23.6.
NEODyS16272030-2084141.15e-06-5.09-5.370NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2012-03-01.343 to 2012-03-05.377."
2012 DG61JPL Sentry16272095-210126.2e-10-5.80-6.020JPL: "Analysis based on 40 observations spanning 6.0324 days (2012-Feb-28.32729 to 2012-Mar-05.35972)." Diameter approximately 1.100 km. from mean, weighted H=17.5.
2012 DW60JPL Sentry16272069-21111454.7e-04-4.39-4.790JPL: "Analysis based on 47 observations spanning 5.5816 days (2012-Feb-29.49427 to 2012-Mar-06.07584)." Diameter approximately 0.017 km. from mean, weighted H=26.4.
NEODyS16272069-2090552.9e-04-4.58-4.780NEODyS: "Based on 47 optical observations (of which 0 are rejected as outliers) from 2012-02-29.495 to 2012-03-06.077."
2012 DA14JPL Sentry16272020-20571202.1e-04-3.29-4.000JPL: "Analysis based on 106 observations spanning 11.419 days (2012-Feb-23.03431 to 2012-Mar-05.45291)." Diameter approximately 0.044 km. from mean, weighted H=24.4.
NEODyS16272020-20903313.61e-04-3.16-3.910NEODyS: "Based on 100 optical observations (of which 3 are rejected as outliers) from 2012-02-23.029 to 2012-03-04.372."

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 6 March '12

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

1628Posted Traffic Report
1627Noted 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 DG61 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 removed 2012 EB2 as an impact risk - see above
Noted that NEODyS has removed 2012 EB2 as an impact risk - 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-E40 - Daily Orbit Update - see above