Contents  on 5 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 5 March '12

Eight objects reported inside ten LD

Eight visitors are reported passing inside ten lunar distances (LD) of Earth today. The nearest, 2012 EA, exits Earth's Hill sphere. Further away and all moving closer, radar target 2012 DH54 comes in from 6.66 to 5.75 LD, 2012 EM1 from 8.08 to 7.72 LD, risk-listed radar target 2012 DW60 from 9.90 to 8.68 LD, and 2008 EJ85 from 9.6 to 9.2 LD*. Three others exit ten LD today: 2012 DS32 leaves from 8.50 to 10.55 LD, 2012 DU60 from 9.52 to 10.23 LD, and 2012 DN31 from 9.62 to 10.68 LD.

Next known to be approaching Earth, 2007 HV4 arrives inside ten LD on April 14th.

This report was posted at 1601 UTC with follow-up in today's DOU MPEC for now risk-listed 2012 EZ1 along with 2012 EM1, 2012 EA, 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. 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. "LD*" indicates some passage uncertainty. See also today's timeline, current sky chart and object details (alt-details), and ephemerides.

NEOCP Activity  on 5 March '12

The MPC's NEO Confirmation Page has 2 listings

When last checked at 2310 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two objects listed. The Tracking News counted a total of five listings on the NEOCP on this day.

New MPECs  on 5 March '12

Minor Planet Electronic Circulars

There were seven MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2012-E39 - "23:45 UT" - Comet C/2012 E1 (Hill)


MPEC 2012-E38 - "23:19 UT" - Editorial Notice: The Retraction of 2012 EL1


<< OOC on 5 Mar. '12 >> MPEC 2012-E37 - "20:32 UT" - Observations and Orbits of Comets


MPEC 2012-E36 - "12:05 UT" - 2012 ES3


MPEC 2012-E35 - "12:03 UT" - 2012 ER3


MPEC 2012-E34 - "12:01 UT" - 2012 EQ3


<< DOU on 5 Mar. '12 >>  MPEC 2012-E33 - "06:06 UT" - Daily Orbit Update

Observers  on 5 March '12

A total of 40 observers appeared in this day's MPECs.

CodeObserver / observatory
I69AGM Obs., 1 in MPEC 2012-E37 -- 246P
J16An Carraig Obs. in Northern Ireland, 2 in MPEC 2012-E33 -- 2011 WV134, 192642
H21Astronomical Research Obs. Westfield in Illinois, 23 in MPECs 2012-E33, 2012-E34, 2012-E35 & 2012-E39 -- 2012 ER3, 2012 EQ3, 2012 EM1, 2012 EJ1, 2012 EB, 2012 EA2, 2012 EA, C/2012 E1, 2012 DZ32, 2012 DZ13, 2012 DX75, 2012 DW60, 2012 DW30, 2012 DV32, 2012 DQ8, 2012 DQ32, 2012 DN14, 2012 DG31, 2012 DA14, 2012 CL2, 2012 BT23, 2012 BM77, 2012 BF77
J51Atlante Obs. in the Canary Islands, 7 in MPECs 2012-E33 & 2012-E37 -- 2012 BT23, 2012 BJ134, C/2011 F1, C/2009 P1, 246P, 164P, 49P
B75Betelgeuse Station in Italy, 4 in MPEC 2012-E37 -- C/2012 CH17, C/2012 A2, C/2011 F1, C/2010 R1
B96Brixiis Obs. in Belgium, 7 in MPEC 2012-E37 -- P/2010 JC81, C/2010 G2, C/2009 P1, 246P, 244P, 164P, 29P
G51Byrne Obs. in southern California, 1 in MPEC 2012-E33 -- 2012 DX75
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2012-E33, 2012-E34 & 2012-E37 -- 2012 EQ3, C/2012 A2, 68267, 21277, 163191, 154007, 164P
G58Chabot Obs. in northern California, 5 in MPEC 2012-E33 -- 2012 DZ32, 2012 DW60, 2012 DP8, 2012 DN14, 2012 DH4
A77Chante-Perdrix Obs. in France, 3 in MPEC 2012-E37 -- C/2006 S3, 78P, 21P
970Chelmsford Obs. in England, 3 in MPEC 2012-E37 -- P/2010 JC81, 164P, 49P
850Cordell-Lorenz Obs. in Tennessee, 2 in MPEC 2012-E37 -- C/2009 P1, 49P
106Crni Vrh Obs. in Slovenia, 2 in MPECs 2012-E37 & 2012-E39 -- C/2012 E1, C/2009 P1
958Dax Obs. in France, 1 in MPEC 2012-E37 -- C/2008 S3
448Desert Moon Obs. in New Mexico, 7 in MPEC 2012-E33 -- 2012 DO8, 2012 DL31, 2012 DK61, 2012 DH4, 2012 DG31, 2008 YT30, 159857
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-E39 -- C/2012 E1
203GiaGa Obs. in Italy, 1 in MPEC 2012-E37 -- 164P
J95Great Shefford Obs. in England, 10 in MPECs 2012-E33, 2012-E34, 2012-E35, 2012-E37 & 2012-E39 -- 2012 ER3, 2012 EQ3, 2012 EA2, 2012 EA, C/2012 E1, 2012 DW60, 2012 DH54, 2012 DG61, 2012 DF31, P/2003 T12
585Kiev Comet Station in the Ukraine, 6 in MPEC 2012-E37 -- C/2011 G1, C/2010 G2, 244P, 164P, 49P, 29P
704LINEAR in New Mexico, 4 in MPECs 2012-E33, 2012-E34 & 2012-E37 -- 2012 EQ3, 2012 EO3, 144411, 117P
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2012-E33, 2012-E34, 2012-E35, 2012-E36 & 2012-E39 -- 2012 ES3, 2012 ER3, 2012 EQ3, C/2012 E1, 2012 DW60, 2012 DH54
G96Mt. Lemmon Survey (MLS) in Arizona, 15 in MPECs 2012-E33, 2012-E35, 2012-E36, 2012-E37 & 2012-E39 -- 2012 ES3, 2012 ER3, C/2012 E1, 2012 DX43, 2012 DP8, 284114, 276049, 21277, 162385, 154590, 138205, 7358, 3102, 164P, 69P
I89Nerpio Obs. in Italy, 1 in MPEC 2012-E39 -- C/2012 E1
A24New Millennium Obs. in Italy, 21 in MPEC 2012-E33 -- 2012 AA11, 2011 XO3, 2011 WV134, 2006 AL8, 85839, 32906, 311554, 29075, 24475, 21088, 209924, 162186, 154269, 143651, 138524, 138013, 137805, 8567, 1627, 1620, 1036
C23Olmen Obs. in Belgium, 3 in MPEC 2012-E37 -- C/2011 F1, C/2009 P1, 49P
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 11 in MPECs 2012-E33 & 2012-E37 -- 2012 DX75, 2012 DN31, 2012 BC20, C/2012 A2, 2011 YV15, C/2011 F1, 2010 SV3, C/2009 P1, 246P, 49P, 29P
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-E39 -- C/2012 E1
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 11 in MPECs 2012-E33, 2012-E34 & 2012-E37 -- 2012 EQ3, 2012 EN3, 2012 DO, C/2012 CH17, 2012 BT23, C/2010 B1, C/2009 F4, 246P, 117P, 49P, 29P
J41Raheny Obs. in Ireland, 1 in MPEC 2012-E34 -- 2012 EQ3
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2012-E34 -- 2012 EQ3
H36Sandlot Obs. in Kansas, 3 in MPECs 2012-E34, 2012-E35 & 2012-E39 -- 2012 ER3, 2012 EQ3, C/2012 E1
C71Sant Marti Sesgueioles Obs. in Spain, 2 in MPEC 2012-E37 -- 246P, 49P
204Schiaparelli Obs. in Italy, 1 in MPEC 2012-E39 -- C/2012 E1
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2012-E33 & 2012-E37 -- 2012 DY43, 2012 DO8, 2011 EB12, P/2011 C2, 312942, 212359, 136618
291Spacewatch 1.8m telescope in Arizona, 30 in MPECs 2012-E33, 2012-E36 & 2012-E39 -- 2012 EZ1, 2012 ES3, 2012 EC, C/2012 E1, 2012 DY43, 2012 DX43, 2012 DW60, 2012 DV43, 2012 DV32, 2012 DT32, 2012 DP8, 2012 DO8, 2012 DL31, 2012 DK61, 2012 DJ61, 2012 DJ4, 2012 DH61, 2012 DH54, 2012 DG61, 2012 DA33, 2012 CR45, 2012 CM29, 2012 CL29, 2012 BN11, 2012 BD27, 2011 YL6, 2010 LR33, 2009 WG54, 2008 HY37, 2004 VB
A71Stixendorf Obs. in Austria, 8 in MPEC 2012-E37 -- C/2012 B3, P/2011 VJ5, P/2010 UH55, C/2010 S1, P/2003 T12, 246P, 164P, 49P
B89Tiana Obs. in Spain, 1 in MPEC 2012-E37 -- C/2009 P1
A03Torredembarra Obs. in Spain, 2 in MPEC 2012-E37 -- P/2011 W2, 49P
B51Vallauris Obs. in France, 2 in MPEC 2012-E37 -- C/2010 R1, 246P
H47Vicksburg Obs. in Mississippi, 5 in MPEC 2012-E37 -- C/2010 R1, C/2010 G2, 246P, 49P, 29P
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 March '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2310 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2012 EZ1JPL Sentry16002079-210731.9e-07-8.69-8.920JPL: "Analysis based on 12 observations spanning 1.1171 days (2012-Mar-02.26107 to 2012-Mar-03.37812)." Diameter approximately 0.006 km. from mean, weighted H=28.8.
2012 ECJPL Sentry16002029-2106941.7e-06-5.03-5.400JPL: "Analysis based on 16 observations spanning 2.8817 days (2012-Mar-01.3419 to 2012-Mar-04.22359)." Diameter approximately 0.065 km. from mean, weighted H=23.6.
NEODyS16002029-206043.53e-07-5.55-5.640NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2012-03-01.343 to 2012-03-04.224."
2012 DG61JPL Sentry16002089-209524.6e-09-4.90-4.980JPL: "Analysis based on 36 observations spanning 5.5658 days (2012-Feb-28.32729 to 2012-Mar-04.89307)." Diameter approximately 1.100 km. from mean, weighted H=17.5.
2012 DW60JPL Sentry16002069-21111424.4e-04-4.46-4.920JPL: "Analysis based on 41 observations spanning 4.7380 days (2012-Feb-29.49427 to 2012-Mar-05.23229)." Diameter approximately 0.017 km. from mean, weighted H=26.5.
NEODyS16002067-2090461.81e-04-4.82-5.040NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2012-02-29.495 to 2012-03-05.233."
2012 DA14JPL Sentry16002020-20571232.2e-04-3.28-4.000JPL: "Analysis based on 97 observations spanning 10.337 days (2012-Feb-23.03431 to 2012-Mar-04.371421)." Diameter approximately 0.044 km. from mean, weighted H=24.4.
NEODyS16002020-20903273.49e-04-3.17-3.910NEODyS: "Based on 96 optical observations (of which 3 are rejected as outliers) from 2012-02-23.029 to 2012-03-04.201."

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 5 March '12

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

0017 3/6Grabbed MPEC 2012-E39 - Comet C/2012 E1 (Hill) - see above
2359Grabbed MPEC 2012-E38 - Editorial Notice: The Retraction of 2012 EL1 - see above
2117Grabbed MPEC 2012-E37 - Observations and Orbits of Comets - see above
1601Posted Traffic Report
1600Noted 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 updated its 2012 EC risk assessment - see above
Noted that NEODyS has updated its 2012 EC risk assessment - see above
Noted that JPL Sentry has posted 2012 EZ1 as an impact risk - see above
Grabbed MPEC 2012-E33 - Daily Orbit Update - see above
Grabbed MPEC 2012-E34 - 2012 EQ3 - see above
Grabbed MPEC 2012-E35 - 2012 ER3 - see above
Grabbed MPEC 2012-E36 - 2012 ES3 - see above