2012-03-05 Tracking News

Contents on 5 March '12

Traffic Report -- eight objects
IAU Minor Planet Center
- NEOCP Activity -- two listings
- New MPECs -- seven MPECs
Observers -- 40 observers
Impact Risk Monitoring -- five objects
Chronology

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page (archive)
Ephemerides for risk-rated & nearby objects + potential mission destinations
News image catalog
News old archive & Small Objects Archive
Object Links - mainly for radar targets & close passers - updated 14 Feb.
Observing Campaigns

The latest A/CC news is available via framed access, 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-E33 time-stamped "06:06 UT" - Daily Orbit Update - see below
MPEC 2012-E34 time-stamped "12:01 UT" - 2012 EQ3 - see below
MPEC 2012-E35 time-stamped "12:03 UT" - 2012 ER3 - see below
MPEC 2012-E36 time-stamped "12:05 UT" - 2012 ES3 - see below
MPEC 2012-E37 time-stamped "20:32 UT" - Observations and Orbits of Comets - see below
MPEC 2012-E38 time-stamped "23:19 UT" - Editorial Notice: The Retraction of 2012 EL1 - see below
MPEC 2012-E39 time-stamped "23:45 UT" - Comet C/2012 E1 (Hill)

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

CK12E010 C/2012 E1 (Hill) (i=122.5°, q=7.481 AU, TP=2011 June 19.97362 TT) from the Mt. Lemmon Survey (MLS) (March 2.48-52p8, 3.48-50p4 & 4.48-50p3), Farra d'Isonzo Obs. (March 3.11-13p2), Schiaparelli Obs. (March 3.11-13p2), Crni Vrh Obs. (March 3.12-13p3), Nerpio Obs. (March 4.21-22p2), the Spacewatch 1.8m telescope (March 4.39-40p3), Astronomical Research Obs. Westfield (March 4.46-47p7), Great Shefford Obs. (March 5.13-16p2), Magdalena Ridge Obs. (MRO) (March 5.37-39p4), Sandlot Obs. (March 5.46-47p2), and Hidetaka Sato via RAS Obs. Mayhill (March 5.51p2)

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

CK12C17H C/2012 CH17 (MOSS) (i=27.8°, q=1.296 AU, TP=2012 Sept. 28.45326 TT) from Betelgeuse Station (March 3.06p3) and Kevin Hills via RAS Obs. Moorook (March 4.64-65p3)
CK12B030 C/2012 B3 (La Sagra) (i=106.9°, q=3.536 AU, TP=2011 Dec. 6.79976 TT) from Stixendorf Obs. (Feb. 27.07-08p2)
CK12A020 C/2012 A2 (LINEAR) (i=125.9°, q=3.537 AU, Q=1760.787 AU, TP=2012 Nov. 5.12374 TT) from Betelgeuse Sta. (March 3.11p3), the Catalina Sky Survey (CSS) (March 3.23-24p4), and Petit Jean Mtn. South Obs. (PJMSO) (March 3.28-29p6)
PK11W020 P/2011 W2 (Rinner) (q=2.303 AU, Q=5.295 AU, TP=2011 Nov. 6.18857 TT) from Torredembarra Obs. (Feb. 16.90-92p4)
PK11V05J P/2011 VJ5 (Lemmon) (q=1.507 AU, Q=5.305 AU, TP=2011 Dec. 8.70197 TT) from Stixendorf Obs. (Feb. 27.01-04p2)
CK11G010 C/2011 G1 (McNaught) (i=162.2°, q=2.155 AU, TP=2011 Sept. 16.41341 TT) from Kiev Comet Station (Feb. 17.83-85p6)
CK11F010 C/2011 F1 (LINEAR) (i=56.6°, q=1.819 AU, TP=2013 Jan. 8.00512 TT) from Betelgeuse Sta. (March 3.13-14p3), PJMSO (March 3.40-41p6, 4.39-40p6 & 5.35-36p6), Atlante Obs. (March 4.11-13p3), and Olmen Obs. (March 4.11-13p3)
PK11C020 P/2011 C2 (Gibbs) (Centaur, q=5.389 AU, Q=9.348 AU, TP=2012 Jan. 7.51109 TT) from the Spacewatch 0.9m telescope (March 5.28-32p3)
PK10U55H P/2010 UH55 (Spacewatch) (q=2.768 AU, Q=10.262 AU, TP=2011 May 10.36054 TT) from Stixendorf Obs. (Feb. 26.95-96p2)
CK10S010 C/2010 S1 (LINEAR) (i=125.3°, q=5.900 AU, TP=2013 May 20.32220 TT) from Stixendorf Obs. (Feb. 22.82-83p7)
CK10R010 C/2010 R1 (LINEAR) (i=156.9°, q=5.621 AU, TP=2012 May 18.89341 TT) from Vallauris Obs. (March 2.18-21p3), Betelgeuse Sta. (March 3.15p3), and Vicksburg Obs. (March 4.47-48p3 & 5.47-48p3)
PK10J81C P/2010 JC81 (WISE) (i=38.7°, q=1.811 AU, Q=14.471 AU, TP=2011 Apr. 26.56192 TT) from Brixiis Obs. (Feb. 1.88-89p2) and Chelmsford Obs. (March 3.95p2)
CK10G020 C/2010 G2 (Hill) (i=103.7°, q=1.981 AU, Q=190.506 AU, TP=2011 Sept. 2.05234 TT) from Brixiis Obs. (Feb. 1.77p3), Kiev Comet Sta. (Feb. 7.77-80p6), and Vicksburg Obs. (March 4.05-07p3)
CK10B010 C/2010 B1 (Cardinal) (i=102.0°, q=2.941 AU, Q=5951.408 AU, TP=2011 Feb. 7.08017 TT) from Hills/RAS Moorook (March 4.47-48p3)
CK09P010 C/2009 P1 (Garradd) (i=106.2°, q=1.551 AU, TP=2011 Dec. 23.67725 TT) from Brixiis Obs. (Feb. 2.21p1), Cordell-Lorenz Obs. (Feb. 22.38-43p3), Crni Vrh Obs. (March 3.10-11p6), Atlante Obs. (March 3.10-12p3 & 4.08-10p3), PJMSO (March 3.37-38p6, 4.36-37p6 & 5.34-35p6), Tiana Obs. (March 3.94-97p3), and Olmen Obs. (March 4.08-10p3)
CK09F040 C/2009 F4 (McNaught) (i=79.3°, q=5.455 AU, TP=2011 Dec. 31.90478 TT) from Hills/RAS Moorook (March 4.54-55p3)
CK08S030 C/2008 S3 (Boattini) (i=162.7°, q=8.018 AU, TP=2011 June 7.40499 TT) from Dax Obs. (Jan. 11.79p1)
CK06S030 C/2006 S3 (LONEOS) (i=166.0°, q=5.131 AU, TP=2012 Apr. 16.34666 TT) from Chante-Perdrix Obs. (March 5.20-22p2)
PK03T120 P/2003 T12 (SOHO) (q=0.589 AU, Q=4.566 AU, TP=2003 Oct. 16.29148 TT) from Stixendorf Obs. (Feb. 22.76-77p2) and Great Shefford Obs. (March 4.81-83p2)
0246P 246P/NEAT from Brixiis Obs. (Feb. 2.15-16p2), Stixendorf Obs. (Feb. 26.98-99p3), Vallauris Obs. (March 2.09-12p4), Hills/RAS Moorook (March 3.76-78p3), Atlante Obs. (March 4.04-08p3), Sant Marti Sesgueioles Obs. (March 4.98-02p2 & 5.06p1), AGM Obs. (March 5.12-15p4), PJMSO (March 5.32-33p6), and Vicksburg Obs. (March 5.37-41p3)
0244P 244P/Scotti from Brixiis Obs. (Feb. 1.83p1) and Kiev Comet Sta. (Feb. 17.89-93p13)
0164P 164P/Christensen from Brixiis Obs. (Feb. 1.98p1), Kiev Comet Sta. (Feb. 17.95-96p9 & 22.95-96p4), Stixendorf Obs. (Feb. 26.88-89p6), GiaGa Obs. (March 3.03-05p2), Atlante Obs. (March 3.97-99p3), Chelmsford Obs. (March 3.98-99p2), CSS (March 4.19-20p4), and MLS (March 4.21-22p4)
0117P 117P/Helin-Roman-Alu 1 from LINEAR (March 2.21-26p5) and Hills/RAS Moorook (March 3.74-75p3)
0078P 78P/Gehrels 2 from Chante-Perdrix Obs. (March 2.79-81p3)
0069P 69P/Taylor from MLS (March 3.28-30p4)
0049P 49P/Arend-Rigaux from Kiev Comet Sta. (Feb. 8.03-07p3), Torredembarra Obs. (Feb. 25.09-12p3), Stixendorf Obs. (Feb. 26.90-91p6), PJMSO (March 3.30-32p6 & 5.26-27p6), Hills/RAS Moorook (March 3.71-72p3), Chelmsford Obs. (March 3.96-97p2), Atlante Obs. (March 4.01-03p3 & 4.98-99p3), Olmen Obs. (March 4.14-15p3), Cordell-Lorenz Obs. (March 4.33-36p3), Sant Marti Sesgueioles Obs. (March 4.88p1 & 4.94-97p2), and Vicksburg Obs. (March 5.32-33p3)
0029P 29P/Schwassmann-Wachmann 1 from Brixiis Obs. (Feb. 2.12p1), Kiev Comet Sta. (Feb. 8.09-13p8), PJMSO (March 3.32p4 & 5.27-28p4), Hills/RAS Moorook (March 4.67-69p3), and Vicksburg Obs. (March 5.34-36p3)
0021P 21P/Giacobini-Zinner from Chante-Perdrix Obs. (March 2.78p3)

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

K12E03S 2012 ES3 (small asteroid, H=25.2 ~31m) from MLS (March 4.35-36p4 & 4.47p4), Spacewatch 1.8m (March 4.45p3), and MRO (March 5.27-29p4)

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

K12E03R 2012 ER3 (small asteroid, H=24.5 ~43m) from MLS (March 4.31-33p4 & 4.45p4), ARO Westfield (March 4.36-37p4), Great Shefford Obs. (March 4.98-99p2), MRO (March 5.22-25p4), and Sandlot Obs. (March 5.41-42p2)

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

K12E03Q 2012 EQ3 (small asteroid, q=0.232 AU, H=22.4 ~112m) from CSS (March 3.37-45p12), Hills/RAS Moorook (March 3.66p3 & 4.62-63p3), Great Shefford Obs. (March 3.94p2 & 4.96-97p3), Sabino Canyon Obs. (March 4.27-28p3), Sandlot Obs. (March 4.27-28p3 & 5.27-30p5), ARO Westfield (March 4.29p4), LINEAR (March 4.29-34p4), Raheny Obs. (March 4.91-93p3), and MRO (March 5.19-22p4)

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

Observations of risk-listed objects
K12E01Z 2012 EZ1 (small asteroid, arc=1 day, H=28.8 ~6m, close passer) from Spacewatch 1.8m (March 3.38p3)
K12E00C 2012 EC (small asteroid, arc=3 days, H=23.5 ~68m) from Spacewatch 1.8m (March 4.22p3)
K12D61G 2012 DG61 (Q=5.674 AU, arc=6 days, H=17.6 ~1.02 km) from Spacewatch 1.8m (March 4.32p2) and Great Shefford Obs. (March 4.87-89p2)
K12D60W 2012 DW60 (small asteroid, arc=5 days, H=26.5 ~17m, close passer, radar support) from Spacewatch 1.8m (March 4.30p3), ARO Westfield (March 4.33-34p3), Chabot Obs. (March 4.37-39p3), Great Shefford Obs. (March 5.10-11p3), and MRO (March 5.21-23p4)
K12D14A 2012 DA14 (small asteroid, arc=10 days, H=24.4 ~45m, close passer, radar support) from ARO Westfield (March 4.35-37p4)
Observations of recently (no longer) risk-listed objects
K12D43Y 2012 DY43 (small asteroid, arc=6 days, H=23.2 ~78m) from Spacewatch 0.9m (March 4.26-29p3) and Spacewatch 1.8m (March 4.27-28p3)
K12D33A 2012 DA33 (small asteroid, arc=7 days, H=23.5 ~68m) from Spacewatch 1.8m (March 4.47-48p3)
K12D32Z 2012 DZ32 (arc=7 days, H=21.5 ~170m) from ARO Westfield (March 4.30-31p3) and Chabot Obs. (March 4.37-39p3)
Observations of close-passing objects
K12E01M 2012 EM1 (arc=2 days, H=26.6 ~16m, close passer) from ARO Westfield (March 4.29p4)
K12E00A 2012 EA (arc=4 days, H=26.9 ~14m, close passer) from ARO Westfield (March 4.33-34p5) and Great Shefford Obs. (March 5.18-19p5)
K12D54H 2012 DH54 (arc=7 days, H=27.7 ~10m, close passer, radar support) from Spacewatch 1.8m (March 4.27p3), Great Shefford Obs. (March 5.08-09p3), and MRO (March 5.21-24p4)
K12D31N 2012 DN31 (arc=8 days, H=23.9 ~56m, close passer) from PJMSO (March 4.45-46p9)
Observation campaigns (radar support, potential mission destinations)
J2642 192642 1999 RD32 (radar) from An Carraig Obs. (March 4.82-83p4)
F4590 154590 2003 MA3 (PMD) from MLS (March 4.29-30p3)
D6618 136618 1994 CN2 (PMD) from Spacewatch 0.9m (March 4.30-34p3)
29075 29075 1950 DA (radar) from New Millennium Obs. (Feb. 21.79p2 & 21.84p2)
-- Potential mission destinations list & ephemerides -- Planetary radar schedules: Arecibo & Goldstone
Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
K12E03O 2012 EO3 (arc=2 days, H=22.9 ~89m) from LINEAR (March 4.29-34p5)
K12E03N 2012 EN3 (arc=1 day, H=24.1 ~51m) from Hills/RAS Moorook (March 4.70-72p4)
K12E01J 2012 EJ1 (arc=3 days, H=25.0 ~34m) from ARO Westfield (March 4.13-14p3)
K12E00B 2012 EB (arc=3 days, H=23.7 ~62m) from ARO Westfield (March 4.23-24p8)
K12D43X 2012 DX43 (arc=6 days, H=23.8 ~59m) from MLS (March 4.35-36p4) and Spacewatch 1.8m (March 4.46p3)
K12D43V 2012 DV43 (arc=7 days, H=26.5 ~17m) from Spacewatch 1.8m (March 4.50-51p3)
K12D32Q 2012 DQ32 (arc=8 days, H=23.8 ~59m) from ARO Westfield (March 4.27-28p4)
K12D31L 2012 DL31 (arc=9 days, H=22.8 ~93m) from Spacewatch 1.8m (March 4.23p3) and Desert Moon Obs. (March 4.23-26p3)
K12D31F 2012 DF31 (arc=10 days, H=24.4 ~45m) from Great Shefford Obs. (March 5.00-02p3)
K12D30W 2012 DW30 (arc=9 days, H=22.7 ~98m) from ARO Westfield (March 4.24-25p3)
K12D14N 2012 DN14 (arc=10 days, H=24.7 ~39m) from ARO Westfield (March 4.27-28p3) and Chabot Obs. (March 4.32-33p4)
K12D13Z 2012 DZ13 (arc=11 days, H=24.1 ~51m) from ARO Westfield (March 4.10p3)
K12D08O 2012 DO8 (arc=12 days, H=22.2 ~123m) from Spacewatch 1.8m (March 4.26p3), Spacewatch 0.9m (March 4.31-35p3), and Desert Moon Obs. (March 4.38-42p2)
K12C45R 2012 CR45 (arc=18 days, H=25.5 ~27m) from Spacewatch 1.8m (March 4.41p3)
K12C29M 2012 CM29 (arc=20 days, H=22.3 ~117m) from Spacewatch 1.8m (March 4.28-29p3)
K12C29L 2012 CL29 (arc=20 days, H=23.4 ~71m) from Spacewatch 1.8m (March 4.30p3)
K12B77M 2012 BM77 (arc=37 days, H=23.9 ~56m) from ARO Westfield (March 4.42-45p3 at V=21.9-22.2)
K12B77F 2012 BF77 (arc=37 days, H=25.0 ~34m) from ARO Westfield (March 4.38-41p3 at V=22.2-7)
K12D32V 2012 DV32 (arc=8 days, H=21.9 ~141m) from Spacewatch 1.8m (March 4.28p3) and ARO Westfield (March 4.35-36p3)
Observations of other asteroidal objects
K12E02A 2012 EA2 (arc=4 days, H=19.3 ~467m) from ARO Westfield (March 4.09-11p3) and Great Shefford Obs. (March 4.84-86p3)
K12D75X 2012 DX75 (arc=4 days, H=20.5 ~269m) from Byrne Obs. (March 3.31-32p8), ARO Westfield (March 4.42-44p6), and PJMSO (March 4.43-44p7)
K12D61K 2012 DK61 (arc=10 days, H=20.9 ~224m) from Spacewatch 1.8m (March 4.23p3) and Desert Moon Obs. (March 4.32-35p3)
K12D61J 2012 DJ61 (i=53.4°, arc=5 days, H=20.0 ~339m) from Spacewatch 1.8m (March 4.42p3)
K12D61H 2012 DH61 (arc=5 days, H=19.0 ~537m) from Spacewatch 1.8m (March 4.42-43p3)
K12D32T 2012 DT32 (arc=10 days, H=21.3 ~186m) from Spacewatch 1.8m (March 4.31p2)
K12D31G 2012 DG31 (arc=9 days, H=19.9 ~355m) from ARO Westfield (March 4.46-47p3) and Desert Moon Obs. (March 4.46-52p3)
K12D08Q 2012 DQ8 (arc=12 days, H=21.3 ~186m) from ARO Westfield (March 4.31-32p6)
K12D08P 2012 DP8 (arc=13 days, H=19.8 ~371m) from Spacewatch 1.8m (March 4.25p3), MLS (March 4.26-27p4), and Chabot Obs. (March 4.34-36p3)
K12D04J 2012 DJ4 (arc=14 days, H=20.3 ~295m) from Spacewatch 1.8m (March 4.21-22p3)
K12D04H 2012 DH4 (arc=15 days, H=20.6 ~257m) from Desert Moon Obs. (March 4.28-30p5) and Chabot Obs. (March 4.34-36p3)
K12D00O 2012 DO (arc=17 days, H=20.2 ~309m) from Hills/RAS Moorook (March 4.45-46p3)
K12C02L 2012 CL2 (arc=32 days, H=18.4 ~708m) from ARO Westfield (March 4.32-33p3)
K12BD4J 2012 BJ134 (q=0.374 AU, Q=4.137 AU, arc=45 days, H=18.2 ~776m) from Atlante Obs. (March 4.93-95p3)
K12B27D 2012 BD27 (i=40.8°, arc=43 days, H=19.8 ~371m) from Spacewatch 1.8m (March 4.49p3)
K12B23T 2012 BT23 (arc=45 days, H=19.0 ~537m) from ARO Westfield (March 4.12-13p7), Hills/RAS Moorook (March 4.43-44p3), and Atlante Obs. (March 4.84-87p3)
K12B20C 2012 BC20 (arc=43 days, H=18.6 ~645m) from PJMSO (March 4.35-36p6)
K12B11N 2012 BN11 (arc=45 days, H=20.8 ~234m) from Spacewatch 1.8m (March 4.45p3)
K12A11A 2012 AA11 (arc=48 days, H=20.0 ~339m) from New Millennium Obs. (Feb. 21.78-83p6)
K11Y15V 2011 YV15 (Q=4.394 AU, arc=3 opp, H=17.2 ~1.23 km) from PJMSO (March 4.44p5)
K11Y06L 2011 YL6 (arc=71 days, H=21.4 ~178m) from Spacewatch 1.8m (March 4.44p3)
K11X03O 2011 XO3 (Q=5.385 AU, arc=86 days, H=16.7 ~1.55 km) from New Millennium Obs. (Feb. 21.77-82p5)
K11WD4V 2011 WV134 (Q=4.676 AU, arc=2 opp, H=17.0 ~1.35 km) from New Millennium Obs. (Feb. 21.77-78p2 & 21.82p2) and An Carraig Obs. (March 4.84-87p3)
K11E12B 2011 EB12 (arc=2 opp, H=21.3 ~186m) from Spacewatch 0.9m (March 4.25-29p3)
K10S03V 2010 SV3 (arc=2 opp, H=20.8 ~234m) from PJMSO (March 4.44-45p6)
K10L33R 2010 LR33 (arc=3 opp, H=18.2 ~776m) from Spacewatch 1.8m (March 4.37-39p3)
K09W54G 2009 WG54 (arc=2 opp, H=21.1 ~204m) from Spacewatch 1.8m (March 4.34-35p3)
K08Y30T 2008 YT30 (arc=3 opp, H=19.4 ~446m) from Desert Moon Obs. (March 4.12-16p3)
K08H37Y 2008 HY37 (arc=3 opp, H=18.4 ~708m) from Spacewatch 1.8m (March 4.48-49p3)
K06A08L 2006 AL8 (q=0.377 AU, Q=6.300 AU, arc=2 opp, H=18.4 ~708m) from New Millennium Obs. (Feb. 21.79-84p4)
K04V00B 2004 VB (arc=4 opp, H=20.8 ~234m) from Spacewatch 1.8m (March 4.46p3)
V2942 312942 1995 EK1 from Spacewatch 0.9m (March 4.18-22p3)
V1554 311554 2006 BQ147 from New Millennium Obs. (Feb. 21.78-83p5)
S4114 284114 2005 TZ51 from MLS (March 4.17-19p4)
R6049 276049 2002 CE26 from MLS (March 4.26-27p4)
L2359 212359 2006 EV52 from Spacewatch 0.9m (March 4.42-45p3)
K9924 209924 2005 WS55 from New Millennium Obs. (Feb. 21.78p2 & 21.82-83p2)
G3191 163191 2002 EQ9 from CSS (March 4.50-51p4)
G2385 162385 2000 BM19 from MLS (March 4.10-12p4)
G2186 162186 1999 OP3 from New Millennium Obs. (Feb. 21.80p2 & 21.85p2)
F9857 159857 2004 LJ1 from Desert Moon Obs. (March 4.18-21p3)
F4269 154269 2002 SM from New Millennium Obs. (Feb. 21.80-85p6)
F4007 154007 2002 BY from CSS (March 4.50-51p4)
E4411 144411 2004 EW9 from LINEAR (March 4.41-46p5)
E3651 143651 2003 QO104 from New Millennium Obs. (Feb. 21.81-86p6)
D8524 138524 2000 OJ8 from New Millennium Obs. (Feb. 21.81-86p6)
D8205 138205 2000 EZ148 from MLS (March 4.26-28p4)
D8013 138013 2000 CN101 from New Millennium Obs. (Feb. 21.81-84p4)
D7805 137805 1999 YK5 from New Millennium Obs. (Feb. 21.77-82p6)
85839 85839 1998 YO4 from New Millennium Obs. (Feb. 21.80-85p6)
68267 68267 2001 EA16 from CSS (March 4.28-30p4)
32906 32906 1994 RH from New Millennium Obs. (Feb. 21.81p2 & 21.86p2)
24475 24475 2000 VN2 from New Millennium Obs. (Feb. 21.80p2 & 21.85p2)
21277 21277 1996 TO5 from MLS (March 4.29-31p4) and CSS (March 4.34-36p4)
21088 21088 1992 BL2 from New Millennium Obs. (Feb. 21.79p2 & 21.84p2)
08567 8567 1996 HW1 from New Millennium Obs. (Feb. 21.83-84p4)
07358 7358 Oze (1995 YA3) from MLS (March 4.17-19p4)
03102 3102 Krok (1981 QA) from MLS (March 4.31-33p4)
01627 1627 Ivar (1929 SH) from New Millennium Obs. (Feb. 21.79p2 & 21.84p2)
01620 1620 Geographos (1951 RA) from New Millennium Obs. (Feb. 21.78p2 & 21.83p2)
01036 1036 Ganymed (1924 TD) from New Millennium Obs. (Feb. 21.77p2 & 21.82p2)

Observers on 5 March '12

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

Code	Observer / observatory
`I69`	AGM Obs., 1 in MPEC 2012-E37 -- 246P
`J16`	An Carraig Obs. in Northern Ireland, 2 in MPEC 2012-E33 -- 2011 WV134, 192642
`H21`	Astronomical 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
`J51`	Atlante 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
`B75`	Betelgeuse Station in Italy, 4 in MPEC 2012-E37 -- C/2012 CH17, C/2012 A2, C/2011 F1, C/2010 R1
`B96`	Brixiis Obs. in Belgium, 7 in MPEC 2012-E37 -- P/2010 JC81, C/2010 G2, C/2009 P1, 246P, 244P, 164P, 29P
`G51`	Byrne Obs. in southern California, 1 in MPEC 2012-E33 -- 2012 DX75
`703`	Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2012-E33, 2012-E34 & 2012-E37 -- 2012 EQ3, C/2012 A2, 68267, 21277, 163191, 154007, 164P
`G58`	Chabot Obs. in northern California, 5 in MPEC 2012-E33 -- 2012 DZ32, 2012 DW60, 2012 DP8, 2012 DN14, 2012 DH4
`A77`	Chante-Perdrix Obs. in France, 3 in MPEC 2012-E37 -- C/2006 S3, 78P, 21P
`970`	Chelmsford Obs. in England, 3 in MPEC 2012-E37 -- P/2010 JC81, 164P, 49P
`850`	Cordell-Lorenz Obs. in Tennessee, 2 in MPEC 2012-E37 -- C/2009 P1, 49P
`106`	Crni Vrh Obs. in Slovenia, 2 in MPECs 2012-E37 & 2012-E39 -- C/2012 E1, C/2009 P1
`958`	Dax Obs. in France, 1 in MPEC 2012-E37 -- C/2008 S3
`448`	Desert Moon Obs. in New Mexico, 7 in MPEC 2012-E33 -- 2012 DO8, 2012 DL31, 2012 DK61, 2012 DH4, 2012 DG31, 2008 YT30, 159857
`595`	Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-E39 -- C/2012 E1
`203`	GiaGa Obs. in Italy, 1 in MPEC 2012-E37 -- 164P
`J95`	Great 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
`585`	Kiev Comet Station in the Ukraine, 6 in MPEC 2012-E37 -- C/2011 G1, C/2010 G2, 244P, 164P, 49P, 29P
`704`	LINEAR in New Mexico, 4 in MPECs 2012-E33, 2012-E34 & 2012-E37 -- 2012 EQ3, 2012 EO3, 144411, 117P
`H01`	Magdalena 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
`G96`	Mt. 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
`I89`	Nerpio Obs. in Italy, 1 in MPEC 2012-E39 -- C/2012 E1
`A24`	New 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
`C23`	Olmen Obs. in Belgium, 3 in MPEC 2012-E37 -- C/2011 F1, C/2009 P1, 49P
`H45`	Petit 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
`J41`	Raheny Obs. in Ireland, 1 in MPEC 2012-E34 -- 2012 EQ3
`854`	Sabino Canyon Obs. in Arizona, 1 in MPEC 2012-E34 -- 2012 EQ3
`H36`	Sandlot Obs. in Kansas, 3 in MPECs 2012-E34, 2012-E35 & 2012-E39 -- 2012 ER3, 2012 EQ3, C/2012 E1
`C71`	Sant Marti Sesgueioles Obs. in Spain, 2 in MPEC 2012-E37 -- 246P, 49P
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2012-E39 -- C/2012 E1
`691`	Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2012-E33 & 2012-E37 -- 2012 DY43, 2012 DO8, 2011 EB12, P/2011 C2, 312942, 212359, 136618
`291`	Spacewatch 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
`A71`	Stixendorf 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
`B89`	Tiana Obs. in Spain, 1 in MPEC 2012-E37 -- C/2009 P1
`A03`	Torredembarra Obs. in Spain, 2 in MPEC 2012-E37 -- P/2011 W2, 49P
`B51`	Vallauris Obs. in France, 2 in MPEC 2012-E37 -- C/2010 R1, 246P
`H47`	Vicksburg 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 EZ1	JPL Sentry	1600	2079-2107	3	1.9e-07	-8.69	-8.92	0	JPL: "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 EC	JPL Sentry	1600	2029-2106	94	1.7e-06	-5.03	-5.40	0	JPL: "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.
2012 EC	NEODyS	1600	2029-2060	4	3.53e-07	-5.55	-5.64	0	NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2012-03-01.343 to 2012-03-04.224."

2012 DG61	JPL Sentry	1600	2089-2095	2	4.6e-09	-4.90	-4.98	0	JPL: "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 DW60	JPL Sentry	1600	2069-2111	142	4.4e-04	-4.46	-4.92	0	JPL: "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.
2012 DW60	NEODyS	1600	2067-2090	46	1.81e-04	-4.82	-5.04	0	NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2012-02-29.495 to 2012-03-05.233."

2012 DA14	JPL Sentry	1600	2020-2057	123	2.2e-04	-3.28	-4.00	0	JPL: "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.
2012 DA14	NEODyS	1600	2020-2090	327	3.49e-04	-3.17	-3.91	0	NEODyS: "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 3/6	Grabbed MPEC 2012-E39 - Comet C/2012 E1 (Hill) - see above
2359	Grabbed MPEC 2012-E38 - Editorial Notice: The Retraction of 2012 EL1 - see above
2117	Grabbed MPEC 2012-E37 - Observations and Orbits of Comets - see above
1601	Posted Traffic Report
1600	Noted 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

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