2012-04-21 Tracking News

Contents on 21 April '12

Traffic Report -- six objects
IAU Minor Planet Center
- NEOCP Activity -- 26 listings
- New MPECs -- eight MPECs
Observers -- 55 observers
Impact Risk Monitoring -- three objects
Chronology

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page (archive)
Of 454 risk-listed objects, 28 have had news in the last 31 days. Updated at 1544 UTC on 21 April.
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 18 April
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 21 April '12

Six objects reported inside ten LD

Six asteroids are reported passing within ten lunar distances (LD) of Earth today. Inside Earth's Hill sphere, newly discovered and risk-listed 2012 HG2 is outbound from 2.67 to 3.39 LD. Further away, 2012 HN1 comes its closest to Earth this time around, reaching 5.21 LD at 1044 UTC, and radar target 2012 GP1 comes its closest on this passage -- 8.96 LD at 0607 UTC. Unobserved 2007 HV4 may be traveling from 6.0 to 7.4 LD (Earth passage uncertainty = +/- 1.748 days). 2012 HE is inbound from 7.61 to 7.00 LD and radar target 2012 HM comes inside ten LD, traveling from 10.74 to 9.32 LD.

Up next, newly announced 2012 HE2 arrives inside ten LD tomorrow, 2012 HQ on April 23rd, and 1992 JD on April 30th.

This report was updated at 1548 UTC with follow-up in today's DOU MPEC for 2012 HG2, 2012 HE2, 2012 HN1, 2012 HQ, 2012 HM, 2012 GP1, and distant 2007 HA, plus 2011 UX255 from last October. Today's first report at 0508 UTC noted two discoveries announced late yesterday: 2012 HG2 (MPEC) and 2012 HE2 (MPEC).

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. Object distances are interpreted by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity on 21 April '12

The MPC's NEO Confirmation Page has 26 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 26 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 41 listings on the NEOCP today.

New MPECs on 21 April '12

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been eight MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-H36 time-stamped "06:03 UT" - Daily Orbit Update - see below
MPEC 2012-H37 time-stamped "11:08 UT" - 2012 HN2 - see below
MPEC 2012-H38 time-stamped "11:13 UT" - 2012 HO2 - see below
MPEC 2012-H39 time-stamped "11:15 UT" - 2012 HP2 - see below
MPEC 2012-H40 time-stamped "11:17 UT" - 2012 HQ2 - see below
MPEC 2012-H41 time-stamped "11:19 UT" - 2012 HR2 - see below
MPEC 2012-H42 time-stamped "16:07 UT" - Observations and Orbits of Comets - see below
MPEC 2012-H43 time-stamped "17:45 UT" - 2001 QN142 = 2012 HP2

MPEC 2012-H43 - "17:45 UT" - 2001 QN142 = 2012 HP2

K12H02P 2012 HP2 from Magdalena Ridge Obs. (MRO) (April 21.45-47p4)
K01QE2N 2001 QN142 (Q=5.243 AU, H=21.6 ~162m)

<< OOC on 21 Apr. '12 >> MPEC 2012-H42 - "16:07 UT" - Observations and Orbits of Comets

PK12F050 P/2012 F5 (Gibbs) (q=2.876 AU, TP=2010 Mar. 20.67923 TT) from Altamira Obs. (April 14.99-00p3), Murrumbateman Obs. (April 16.48-50p2), and Maisoncelles Obs. (April 16.88-90p2)
PK12F020 P/2012 F2 (Panstarrs) (q=2.903 AU, Q=9.684 AU, TP=2013 Apr. 10.89026 TT) from Pan-STARRS 1 (PS1) (April 13.35-39p3)
CK12E030 C/2012 E3 (Panstarrs) (i=105.7°, q=3.827 AU, Q=452.153 AU, TP=2011 May 12.90812 TT) from the Catalina Sky Survey (CSS) (April 16.40-46p8)
CK12C17H C/2012 CH17 (MOSS) (q=1.296 AU, Q=124627.329 AU, TP=2012 Sept. 28.24093 TT) from Pear Tree Obs. (April 14.07-09p3), Moriyama Obs. (April 14.53-54p2), Vicksburg Obs. (April 15.08-11p3), Altamira Obs. (April 15.11-13p3), Petit Jean Mtn. South Obs. (PJMSO) (April 15.23-24p7), and Haute Provence Obs. (April 20.83p2)
CK12B98J C/2012 BJ98 (Centaur, q=2.157 AU, Q=32.025 AU, TP=2012 Sept. 20.41949 TT) from Ka-Dar Obs. TAU Station (April 13.81-82p3), LINEAR (April 14.13-18p5), Altamira Obs. (April 14.93-95p3), Olmen Obs. (April 16.86-87p3), and the Mt. Lemmon Survey (MLS) (April 20.17-19p3)
CK12B030 C/2012 B3 (La Sagra) (i=106.9°, q=3.536 AU, TP=2011 Dec. 6.82842 TT) from Moriyama Obs. (April 14.76-77p2) and Altamira Obs. (April 15.15-16p3)
PK12B010 P/2012 B1 (Panstarrs) (q=3.826 AU, Q=9.158 AU, TP=2013 July 23.08859 TT) from TAU Sta. (April 13.85-86p3) and Moriyama Obs. (April 14.48-49p2)
CK12A020 C/2012 A2 (LINEAR) (i=125.9°, q=3.537 AU, Q=1946.030 AU, TP=2012 Nov. 5.08962 TT) from Oleksandr V. Shulga via Nikolaev Obs. (April 11.77p4 & 11.84p2), Geisei Obs. (April 12.45p2 & 15.58-59p4), TAU Sta. (April 13.88-89p3), Moriyama Obs. (April 14.58-59p2), Cielo Profundo Obs. (April 14.84-86p3), Altamira Obs. (April 14.91-93p3), PJMSO (April 15.22-23p6 & 18.22-23p6), Olmen Obs. (April 20.10-11p3), and CSS (April 21.22-23p4)
CK11UU5F C/2011 UF305 (LINEAR) (i=94.0°, q=2.138 AU, TP=2012 July 22.16016 TT) from Shulga/Nikolaev Obs. (April 12.06-09p4), Moriyama Obs. (April 14.81p2), Cielo Profundo Obs. (April 15.16-19p3), Olmen Obs. (April 16.03-04p3 & 20.14-15p3), and Yatsuka Obs. (April 17.79p3)
CK11L040 C/2011 L4 (Panstarrs) (i=84.2°, q=0.302 AU, TP=2013 Mar. 10.16532 TT) from Farm Cove Obs. (April 14.50-51p4), Auckland Obs. (April 17.56-57p3), Yatsuka Obs. (April 17.78p3), Stixendorf Obs. (April 18.05-06p6), and LINEAR (April 20.42-47p5)
CK11J020 C/2011 J2 (LINEAR) (i=122.8°, q=3.443 AU, TP=2013 Dec. 25.27448 TT) from Kurihara Obs. (April 9.47-48p3), Farm Cove Obs. (April 14.35-36p5), Moriyama Obs. (April 14.62-63p2 & 15.58-59p2), Altamira Obs. (April 14.96-97p3), Vicksburg Obs. (April 15.13-17p3), LINEAR (April 17.18-23p5 & 18.12-17p5), and MLS (April 19.13-16p4)
PK11FE3R P/2011 FR143 (Lemmon) (q=3.736 AU, Q=9.923 AU, TP=2011 Mar. 10.73979 TT) from Geisei Obs. (April 14.75-77p2)
CK11F010 C/2011 F1 (LINEAR) (i=56.6°, q=1.819 AU, TP=2013 Jan. 8.00722 TT) from Kurihara Obs. (April 9.51p3), Blanes Obs. (April 13.98p3 & 20.86p3), Moriyama Obs. (April 14.72-73p2), Cielo Profundo Obs. (April 15.01-04p3), Pear Tree Obs. (April 15.16-18p3), Yatsuka Obs. (April 15.51-52p3), Blanquita Obs. (April 16.88-90p3), Montcabre Obs. (April 16.94-98p2 & 17.07p1), and PJMSO (April 18.38p6 & 19.25-26p6)
PK11C020 P/2011 C2 (Gibbs) (Centaur, q=5.389 AU, Q=9.348 AU, TP=2012 Jan. 7.52527 TT) from the Spacewatch 0.9m telescope (April 13.16-20p3)
CK11A030 C/2011 A3 (Gibbs) (q=2.345 AU, Q=2118.861 AU, TP=2011 Dec. 16.08869 TT) from Yatsuka Obs. (April 17.81-82p2)
CK10S010 C/2010 S1 (LINEAR) (i=125.3°, q=5.900 AU, TP=2013 May 20.32275 TT) from Yatsuka Obs. (April 17.80p3) and Olmen Obs. (April 20.12-13p3)
CK10R010 C/2010 R1 (LINEAR) (i=156.9°, q=5.621 AU, TP=2012 May 18.90093 TT) from Galati Obs. (March 18.10-12p9), Vicksburg Obs. (April 13.37-39p3, 14.39-40p3, 19.32-35p3 & 20.34-36p3), PS1 (April 14.55-56p2), Moriyama Obs. (April 14.74-75p2), Cielo Profundo Obs. (April 15.06-09p3), Altamira Obs. (April 15.14-15p3), Olmen Obs. (April 16.98-01p3), and Stixendorf Obs. (April 18.03-04p6)
PK10J81C P/2010 JC81 (WISE) (i=38.7°, q=1.811 AU, Q=14.471 AU, TP=2011 Apr. 26.56187 TT) from TAU Sta. (April 13.91-92p3), Moriyama Obs. (April 14.56p2), and Olmen Obs. (April 15.95-96p3)
CK10F87B C/2010 FB87 (WISE-Garradd) (i=107.6°, q=2.843 AU, Q=603.564 AU, TP=2010 Nov. 7.38566 TT) from TAU Sta. (2011 Nov. 19.02-03p2)
CK09P010 C/2009 P1 (Garradd) (i=106.2°, q=1.551 AU, TP=2011 Dec. 23.67708 TT) from Kiev Comet Station (March 26.93-94p4), Baldone Obs. (April 10.80-81p5), El Teatrillo de Lyra Obs. (April 13.91-92p3), Blanes Obs. (April 13.99p3 & 20.92p3), Moriyama Obs. (April 14.51-52p2), PJMSO (April 15.21-22p7 & 18.21-22p6), Yatsuka Obs. (April 15.46p3), Olmen Obs. (April 15.89-92p3, 16.94-98p3 & 20.05-06p3), Blanquita Obs. (April 16.84p3), and Montcabre Obs. (April 17.82-84p3)
CK09F040 C/2009 F4 (McNaught) (i=79.3°, q=5.455 AU, TP=2011 Dec. 31.90222 TT) from Kevin Hills via RAS Obs. Moorook (April 16.49-50p3)
CK06S030 C/2006 S3 (LONEOS) (i=166.0°, q=5.131 AU, TP=2012 Apr. 16.34731 TT) from Vicksburg Obs. (April 13.41p3, 14.41-42p3, 19.36-37p4 & 20.37-38p4), Moriyama Obs. (April 14.79p2), Cielo Profundo Obs. (April 15.13-15p3), Stixendorf Obs. (April 18.07-08p3), and Olmen Obs. (April 20.11-12p3)
CK05L030 C/2005 L3 (McNaught) (i=139.4°, q=5.593 AU, Q=125827.246 AU, TP=2008 Jan. 16.00593 TT) from TAU Sta. (April 13.87p2)
0257 from Spacewatch 0.9m (April 16.35-38p3 & 20.39-43p3)
0246P 246P/NEAT from Galati Obs. (March 18.12-13p12), Kurihara Obs. (April 9.50p3), Shulga/Nikolaev Obs. (April 12.02p4), Moriyama Obs. (April 14.68p2), CSS (April 15.25-26p4), Yatsuka Obs. (April 15.50-51p3), Olmen Obs. (April 15.99-03p3 & 20.08-09p3), and Maisoncelles Obs. (April 16.98-99p3)
0240P 240P/NEAT (q=2.124 AU, Q=5.600 AU, TP=2010 Oct. 4.27295 TT) from CSS (April 16.40-46p7)
0228P 228P/LINEAR from Spacewatch 0.9m (April 19.17-20p3)
0164P 164P/Christensen from TAU Sta. (April 13.89-90p3) and Altamira Obs. (April 15.06-09p3)
0162P 162P/Siding Spring from MLS (April 21.26-29p4)
0152P 152P/Helin-Lawrence from Vicksburg Obs. (April 19.41-44p3)
0123P 123P/West-Hartley from Murrumbateman Obs. (April 16.65-66p2)
0117P 117P/Helin-Roman-Alu 1 from Kurihara Obs. (April 9.49p2) and Altamira Obs. (April 15.02-05p3)
0103P 103P/Hartley 2 from PS1 (April 14.34-38p4)
0096P 96P/Machholz 1 from Auger Obs. (April 20.40-41p3)
0078P 78P/Gehrels 2 from Stixendorf Obs. (April 12.81-82p6), Yatsuka Obs. (April 14.44-45p3), and Olmen Obs. (April 15.83-84p3)
0067P 67P/Churyumov-Gerasimenko from Richard Miles via Faulkes Telescope South (April 19.52-53p3)
0049P 49P/Arend-Rigaux from Pear Tree Obs. (April 14.14-17p3), Cordell-Lorenz Obs. (April 14.15-17p2 & 14.22p1), Moriyama Obs. (April 14.70p2), Cielo Profundo Obs. (April 14.92-95p3), Vicksburg Obs. (April 15.18-20p3), PJMSO (April 15.24-25p6, 18.23-25p6 & 19.29-30p6), Yatsuka Obs. (April 15.48-49p3), Olmen Obs. (April 15.85-87p3 & 20.07-08p3), Maisoncelles Obs. (April 16.92-95p3), and Blanes Obs. (April 20.89-90p3)
0031P 31P/Schwassmann-Wachmann 2 from Spacewatch 0.9m (April 19.34-37p3)
0029P 29P/Schwassmann-Wachmann 1 from Kurihara Obs. (April 9.52p2), PS1 (April 13.37-39p3 & 14.34-38p4), Cielo Profundo Obs. (April 14.96-99p3), Vicksburg Obs. (April 15.21-22p2 & 19.30-31p3), Moriyama Obs. (April 15.55-56p2), Olmen Obs. (April 15.92-93p3, 16.89-90p2, 17.02p1 & 20.04-05p3), Murrumbateman Obs. (April 16.51p2), Maisoncelles Obs. (April 16.95-97p3), Montcabre Obs. (April 18.83-85p3), PJMSO (April 19.27-28p4), and Blanes Obs. (April 20.88-89p3)
0017P 17P/Holmes from Miles/Faulkes South (April 13.61-62p2)

MPEC 2012-H41 - "11:19 UT" - 2012 HR2

K12H02R 2012 HR2 (small asteroid, H=23.0 ~85m) from MLS (April 20.46-50p9 & 21.36-38p3) and Sandlot Obs. (April 21.41-42p4)

MPEC 2012-H40 - "11:17 UT" - 2012 HQ2

K12H02Q 2012 HQ2 (small asteroid, H=24.1 ~51m) from MLS (April 20.36-39p4 & 20.45p4), Mt. John Obs. (April 20.52-53p4), Cordoba Obs. Bosque Alegre Station (April 21.22p3), Grasslands Obs. (April 21.27p3), and Sandlot Obs. (April 21.38-39p3)

MPEC 2012-H39 - "11:15 UT" - 2012 HP2

K12H02P 2012 HP2 (Q=5.008 AU, H=21.5 ~170m) from MLS (April 19.37-43p8), Great Shefford Obs. (April 20.09-10p3), and the Spacewatch 1.8m telescope (April 21.42p3)

MPEC 2012-H38 - "11:13 UT" - 2012 HO2

K12H02O 2012 HO2 (H=20.4 ~282m) from MLS (April 19.32-35p3), Mt. John Obs. (April 19.54-55p4), Great Shefford Obs. (April 20.05-06p2 & 21.04-05p2), Bosque Alegre Sta. (April 21.20-21p3), MRO (April 21.24-27p4), Grasslands Obs. (April 21.26p3), and Sandlot Obs. (April 21.37-38p3)

MPEC 2012-H37 - "11:08 UT" - 2012 HN2

K12H02N 2012 HN2 (Q=4.002 AU, H=19.8 ~371m) from CSS (April 18.45-48p8), Mt. John Obs. (April 18.60-61p3 & 19.57p6), Bosque Alegre Sta. (April 19.18p4), Astronomical Research Obs. Westfield (April 19.32-33p3), PS1 (April 19.51-55p3 & 20.41-44p4), MLS (April 20.41p3), and Grasslands Obs. (April 21.27p3)

<< DOU on 21 Apr. '12 >> MPEC 2012-H36 - "06:03 UT" - Daily Orbit Update

Observations of risk-listed objects
K12H02G 2012 HG2 (small asteroid, arc=1 day, H=26.9 ~14m, close passer) from Siegen Obs. (April 20.97-98p6)
K12G17V 2012 GV17 (arc=6 days, H=20.9 ~224m) from MLS (April 20.23p2 at V=22.0-22.3) and Spacewatch 1.8m (April 20.25-26p3)
Observations of recently (no longer) risk-listed objects
K12H00Q 2012 HQ (small asteroid, arc=4 days, H=25.0 ~34m, close passer) from Spacewatch 1.8m (April 20.29p3)
K12G00K 2012 GK (small asteroid, arc=18 days, H=22.5 ~107m) from Spacewatch 1.8m (April 20.34p3)
K12F01Q 2012 FQ1 (Q=4.208 AU, arc=36 days, H=19.0 ~537m) from Spacewatch 1.8m (April 21.17-19p3)
Observations of close-passing objects
K12H02E 2012 HE2 (arc=1 day, H=25.9 ~22m) from GiaGa Obs. (April 20.94-96p2) and Schiaparelli Obs. (April 20.96-97p3)
K12H01N 2012 HN1 (arc=4 days, H=27.0 ~13m) from Great Shefford Obs. (April 21.11-12p2)
K12H00M 2012 HM (arc=4 days, H=24.1 ~51m, radar support) from Walnut Creek Obs. (April 20.22-23p3) and CSS (April 20.41-43p4)
K12G01P 2012 GP1 (arc=9 days, H=26.2 ~19m, radar support) from Spacewatch 1.8m (April 20.44p3)
K11UP5X 2011 UX255 (arc=2 days, H=27.4 ~11m) from ESA Optical Ground Station (ESA OGS) (2011 Oct. 31.08-10p3)
K07H00A 2007 HA (arc=2 opp, H=20.3 ~295m) from Sandlot Obs. (April 21.09-13p4)
Observation campaigns (radar support, potential mission destinations)
D6618 136618 1994 CN2 (PMD) from MLS (April 20.20-22p4)
-- Potential mission destinations list & ephemerides + NHATS -- Planetary radar schedules: Arecibo & Goldstone
Observations of small asteroids (H>22.0)
K12H02F 2012 HF2 (arc=1 day, H=24.5 ~43m) from GiaGa Obs. (April 20.98-99p2)
K12H01O 2012 HO1 (arc=3 days, H=23.5 ~68m) from Sandlot Obs. (April 21.16-18p2)
K12H00L 2012 HL (arc=4 days, H=22.6 ~102m) from LINEAR (April 20.31-35p4)
K12H00K 2012 HK (arc=4 days, H=23.5 ~68m) from Walnut Creek Obs. (April 20.26p4)
K12G11V 2012 GV11 (arc=7 days, H=22.1 ~129m) from Spacewatch 1.8m (April 20.43-44p3)
K12G05D 2012 GD5 (arc=8 days, H=22.5 ~107m) from Spacewatch 1.8m (April 20.35-36p3)
K12G05C 2012 GC5 (arc=8 days, H=25.2 ~31m) from Spacewatch 1.8m (April 20.29-30p3)
K12G05B 2012 GB5 (arc=8 days, H=23.6 ~65m) from Spacewatch 1.8m (April 20.27-28p3)
K12G05A 2012 GA5 (arc=8 days, H=24.2 ~49m) from Spacewatch 1.8m (April 20.31-32p3)
K12G02C 2012 GC2 (arc=8 days, H=23.1 ~81m) from Walnut Creek Obs. (April 20.24-25p4)
K12F71C 2012 FC71 (arc=21 days, H=25.2 ~31m) from program code "}" (33) on Mauna Kea (April 1.53-54p3), Spacewatch 1.8m (April 20.36-37p3), and Sandlot Obs. (April 21.22-24p3)
K12F62U 2012 FU62 (arc=22 days, H=22.4 ~112m) from Spacewatch 1.8m (April 20.38-39p3)
K12F01D 2012 FD1 (arc=34 days, H=22.8 ~93m) from CSS (April 20.22-24p8)
K11UB4Y 2011 UY114 (arc=34 days, H=23.4 ~71m) from Chabot Obs. (2011 Oct. 30.35p3)
K08G02G 2008 GG2 (arc=4 opp, H=22.8 ~93m) from CSS (April 20.33-35p4) and PS1 (April 20.40-43p4)
Observations of other asteroidal objects
K12H01M 2012 HM1 (arc=4 days, H=21.3 ~186m) from Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (April 20.01-02p3)
K12G11X 2012 GX11 (arc=6 days, H=21.0 ~214m) from Holmes/CTIO (April 20.37-39p3) and Spacewatch 1.8m (April 20.45-46p3)
K12G05T 2012 GT5 (arc=8 days, H=20.8 ~234m) from Spacewatch 1.8m (April 20.32-33p3)
K12G05S 2012 GS5 (Q=6.223 AU, arc=10 days, H=18.7 ~616m) from Spacewatch 1.8m (April 20.34-35p3) and Sandlot Obs. (April 21.20-21p3)
K12G01G 2012 GG1 (arc=2 opp, H=18.8 ~589m) from Spacewatch 1.8m (April 20.28p3)
K12F35K 2012 FK35 (arc=30 days, H=18.2 ~776m) from Spacewatch 1.8m (April 21.15-16p3)
K12E14S 2012 ES14 (Q=4.235 AU, arc=37 days, H=20.1 ~323m) from Walnut Creek Obs. (April 20.17p3) and Cordell-Lorenz Obs. (April 20.20-26p5)
K12D00O 2012 DO (arc=64 days, H=20.3 ~295m) from Pear Tree Obs. (April 20.20-23p3), Spacewatch 0.9m (April 20.23-26p3), and PS1 (April 20.41-44p4)
K11Q48D 2011 QD48 (arc=2 opp, H=18.2 ~776m) from Bigmuskie Obs. (April 20.81-82p3)
K10L33R 2010 LR33 (arc=3 opp, H=18.0 ~851m) from Spacewatch 1.8m (April 20.24-25p3 & 21.20p3)
K10L14J 2010 LJ14 (arc=2 opp, H=17.9 ~891m) from Spacewatch 0.9m (April 20.46-50p3)
K09H58U 2009 HU58 (q=0.187 AU, arc=2 opp, H=19.1 ~513m) from PS1 (April 20.45-49p4)
K08U07G 2008 UG7 (i=40.8°, arc=2 opp, H=21.2 ~195m) from CSS (April 20.36-39p4)
K08H01W 2008 HW1 (q=0.101 AU, Q=5.063 AU, arc=2 opp, H=17.4 ~1.12 km) from Spacewatch 0.9m (April 20.29-32p3)
K07U06B 2007 UB6 (arc=4 opp, H=19.5 ~426m) from MLS (April 20.46-48p4)
V8450 318450 2005 EJ from Spacewatch 0.9m (April 20.17-21p3)
O1370 241370 2008 LW8 from CSS (April 20.25-28p4)
K9924 209924 2005 WS55 from program code 3 via Nikolaev Obs. (2011 Oct. 26.88-89p8, 2011 Oct. 29.87-88p9 & 2011 Nov. 3.85-86p7)
I9062 189062 2000 VA45 from PS1 (2011 Nov. 24.48-51p3)
I9008 189008 1996 FR3 from LINEAR (April 20.31-35p5)
F4302 154302 2002 UQ3 from Nikolaev Obs./code 3 (2011 Oct. 26.94-95p10, 2011 Oct. 29.92-94p10 & 2011 Nov. 3.91-92p10)
F4229 154229 2002 JN97 from MLS (April 20.13-14p4)
F2889 152889 2000 CF59 from PS1 (April 20.45-48p4)
D8852 138852 2000 WN10 from Monte Baldo Obs. (2011 Nov. 24.94-95p12), GiaGa Obs. (2011 Nov. 24.96-99p3), and Cruz del Sur Obs. (2011 Nov. 25.02p3)
D6923 136923 1998 JH2 from Nikolaev Obs./code 3 (2011 Oct. 26.99-00p10)
A0926 100926 1998 MQ from CSS (April 20.29-31p4)
86667 86667 2000 FO10 from MLS (April 20.34-35p3)
10150 10150 1994 PN from PS1 (April 20.45-48p4)
09400 9400 1994 TW1 from LINEAR (April 20.25-30p5)
06455 6455 1992 HE from Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) (April 21.15p5)
03352 3352 McAuliffe (1981 CW) from Kiev Comet Sta. (April 12.80-02p93)
03102 3102 Krok (1981 QA) from MLS (April 20.20-22p4)
01866 1866 Sisyphus (1972 XA) from Sabadell Obs. (March 16.82-83p6)

Observers on 21 April '12

A total of 55 observers appear in today's MPECs.

Code	Observer / observatory
`J24`	Altamira Obs. in the Canary Islands, 9 in MPEC 2012-H42 -- P/2012 F5, C/2012 CH17, C/2012 BJ98, C/2012 B3, C/2012 A2, C/2011 J2, C/2010 R1, 164P, 117P
`H21`	Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2012-H37 -- 2012 HN2
`467`	Auckland Obs. in New Zealand, 1 in MPEC 2012-H42 -- C/2011 L4
`I47`	Auger Obs. in Argentina, 1 in MPEC 2012-H42 -- 96P
`069`	Baldone Obs. in Latvia, 1 in MPEC 2012-H42 -- C/2009 P1
`B88`	Bigmuskie Obs. in Italy, 1 in MPEC 2012-H36 -- 2011 QD48
`C86`	Blanes Obs. in Spain, 4 in MPEC 2012-H42 -- C/2011 F1, C/2009 P1, 49P, 29P
`I99`	Blanquita Obs. in Spain, 2 in MPEC 2012-H42 -- C/2011 F1, C/2009 P1
`703`	Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2012-H36, 2012-H37 & 2012-H42 -- 2012 HN2, 2012 HM, 2012 FD1, C/2012 E3, C/2012 A2, 2008 UG7, 2008 GG2, 241370, 100926, 246P, 240P
`807\|`	Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2012-H36 -- 2012 HM1, 2012 GX11
`G58`	Chabot Obs. in northern California, 1 in MPEC 2012-H36 -- 2011 UY114
`J01`	Cielo Profundo Obs. in Spain, 7 in MPEC 2012-H42 -- C/2012 A2, C/2011 UF305, C/2011 F1, C/2010 R1, C/2006 S3, 49P, 29P
`850`	Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2012-H36 & 2012-H42 -- 2012 ES14, 49P
`821`	Cordoba Obs. Bosque Alegre Station in Argentina, 3 in MPECs 2012-H37, 2012-H38 & 2012-H40 -- 2012 HQ2, 2012 HO2, 2012 HN2
`I39`	Cruz del Sur Obs. in Argentina, 1 in MPEC 2012-H36 -- 138852
`G48`	Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-H36 -- 6455
`J04`	ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2012-H36 -- 2011 UX255
`C74`	El Teatrillo de Lyra Obs. in Spain, 1 in MPEC 2012-H42 -- C/2009 P1
`E85`	Farm Cove Obs. in New Zealand, 2 in MPEC 2012-H42 -- C/2011 L4, C/2011 J2
`E105`	Richard Miles in England via Faulkes Telescope South in New South Wales, 2 in MPEC 2012-H42 -- 67P, 17P
`C73`	Galati Obs. in Romania, 2 in MPEC 2012-H42 -- C/2010 R1, 246P
`372`	Geisei Obs. in Japan, 2 in MPEC 2012-H42 -- C/2012 A2, P/2011 FR143
`203`	GiaGa Obs. in Italy, 3 in MPEC 2012-H36 -- 2012 HF2, 2012 HE2, 138852
`651`	Grasslands Obs. in Arizona, 3 in MPECs 2012-H37, 2012-H38 & 2012-H40 -- 2012 HQ2, 2012 HO2, 2012 HN2
`J95`	Great Shefford Obs. in England, 3 in MPECs 2012-H36, 2012-H38 & 2012-H39 -- 2012 HP2, 2012 HO2, 2012 HN1
`511`	Haute Provence Obs. in Germany, 1 in MPEC 2012-H42 -- C/2012 CH17
`C32`	Ka-Dar Obs. TAU Station in Russia, 7 in MPEC 2012-H42 -- C/2012 BJ98, P/2012 B1, C/2012 A2, P/2010 JC81, C/2010 FB87, C/2005 L3, 164P
`585`	Kiev Comet Station in the Ukraine, 2 in MPECs 2012-H36 & 2012-H42 -- C/2009 P1, 3352
`D95`	Kurihara Obs. in Japan, 5 in MPEC 2012-H42 -- C/2011 J2, C/2011 F1, 246P, 117P, 29P
`704`	LINEAR in New Mexico, 6 in MPECs 2012-H36 & 2012-H42 -- 2012 HL, C/2012 BJ98, C/2011 L4, C/2011 J2, 189008, 9400
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2012-H38 & 2012-H43 -- 2012 HP2, 2012 HO2
`C10`	Maisoncelles Obs. in France, 4 in MPEC 2012-H42 -- P/2012 F5, 246P, 49P, 29P
`568}`	program code "}" (33) on Mauna Kea in Hawaii, 1 in MPEC 2012-H36 -- 2012 FC71
`213`	Montcabre Obs. in Spain, 3 in MPEC 2012-H42 -- C/2011 F1, C/2009 P1, 29P
`A99`	Monte Baldo Obs. in Italy, 1 in MPEC 2012-H36 -- 138852
`900`	Moriyama Obs. in Japan, 14 in MPEC 2012-H42 -- C/2012 CH17, C/2012 B3, P/2012 B1, C/2012 A2, C/2011 UF305, C/2011 J2, C/2011 F1, C/2010 R1, P/2010 JC81, C/2009 P1, C/2006 S3, 246P, 49P, 29P
`474`	Mt. John Obs. in New Zealand, 3 in MPECs 2012-H37, 2012-H38 & 2012-H40 -- 2012 HQ2, 2012 HO2, 2012 HN2
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 14 in MPECs 2012-H36, 2012-H37, 2012-H38, 2012-H39, 2012-H40, 2012-H41 & 2012-H42 -- 2012 HR2, 2012 HQ2, 2012 HP2, 2012 HO2, 2012 HN2, 2012 GV17, C/2012 BJ98, C/2011 J2, 2007 UB6, 86667, 154229, 136618, 3102, 162P
`E07`	Murrumbateman Obs. in New South Wales, 3 in MPEC 2012-H42 -- P/2012 F5, 123P, 29P
`0892`	Oleksandr V. Shulga via Nikolaev Obs. in the Ukraine, 3 in MPEC 2012-H42 -- C/2012 A2, C/2011 UF305, 246P
`0893`	program code 3 via Nikolaev Obs. in the Ukraine, 3 in MPEC 2012-H36 -- 209924, 154302, 136923
`C23`	Olmen Obs. in Belgium, 12 in MPEC 2012-H42 -- C/2012 BJ98, C/2012 A2, C/2011 UF305, C/2010 S1, C/2010 R1, P/2010 JC81, C/2009 P1, C/2006 S3, 246P, 78P, 49P, 29P
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 11 in MPECs 2012-H36, 2012-H37 & 2012-H42 -- 2012 HN2, P/2012 F2, 2012 DO, C/2010 R1, 2009 HU58, 2008 GG2, 189062, 152889, 10150, 103P, 29P
`H23`	Pear Tree Obs. in Florida, 4 in MPECs 2012-H36 & 2012-H42 -- 2012 DO, C/2012 CH17, C/2011 F1, 49P
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2012-H42 -- C/2012 CH17, C/2012 A2, C/2011 F1, C/2009 P1, 49P, 29P
D90`	Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-H42 -- C/2009 F4
`619`	Sabadell Obs. in Spain, 1 in MPEC 2012-H36 -- 1866
`H36`	Sandlot Obs. in Kansas, 7 in MPECs 2012-H36, 2012-H38, 2012-H40 & 2012-H41 -- 2012 HR2, 2012 HQ2, 2012 HO2, 2012 HO1, 2012 GS5, 2012 FC71, 2007 HA
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2012-H36 -- 2012 HE2
`510`	Siegen Obs. in Germany, 1 in MPEC 2012-H36 -- 2012 HG2
`691`	Spacewatch 0.9m telescope in Arizona, 8 in MPECs 2012-H36 & 2012-H42 -- 2012 DO, P/2011 C2, 2010 LJ14, 2008 HW1, 318450, 257P, 228P, 31P
`291`	Spacewatch 1.8m telescope in Arizona, 19 in MPECs 2012-H36 & 2012-H39 -- 2012 HQ, 2012 HP2, 2012 GX11, 2012 GV17, 2012 GV11, 2012 GT5, 2012 GS5, 2012 GP1, 2012 GK, 2012 GG1, 2012 GD5, 2012 GC5, 2012 GB5, 2012 GA5, 2012 FU62, 2012 FQ1, 2012 FK35, 2012 FC71, 2010 LR33
`A71`	Stixendorf Obs. in Austria, 4 in MPEC 2012-H42 -- C/2011 L4, C/2010 R1, C/2006 S3, 78P
`H47`	Vicksburg Obs. in Mississippi, 7 in MPEC 2012-H42 -- C/2012 CH17, C/2011 J2, C/2010 R1, C/2006 S3, 152P, 49P, 29P
`G56`	Walnut Creek Obs. in northern California, 4 in MPEC 2012-H36 -- 2012 HM, 2012 HK, 2012 GC2, 2012 ES14
`367`	Yatsuka Obs. in Japan, 9 in MPEC 2012-H42 -- C/2011 UF305, C/2011 L4, C/2011 F1, C/2011 A3, C/2010 S1, C/2009 P1, 246P, 78P, 49P

For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring on 21 April '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.
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 HG2	JPL Sentry	1544	2048-2059	24	1.9e-04	-4.78	-5.53	0	JPL #2 for the day: "Analysis based on 41 observations spanning .61046 days (2012-Apr-20.37147 to 2012-Apr-20.981927)." Diameter approximately 0.014 km. from mean, weighted H=26.9.

2012 GV17	JPL Sentry	1544	2031-2110	61	1.9e-06	-3.92	-4.51	0	JPL: "Analysis based on 17 observations spanning 5.9174 days (2012-Apr-14.34248 to 2012-Apr-20.25992)." Diameter approximately 0.200 km. from mean, weighted H=21.2.
2012 GV17	NEODyS	1544	2031-2089	34	8.38e-07	-4.13	-4.58	0	NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2012-04-14.343 to 2012-04-20.261."

2012 DA14	NEODyS	1544	2020-2090	205	2.75e-04	-3.29	-3.8	0	NEODyS: "Based on 184 optical observations (of which 4 are rejected as outliers) from 2012-02-23.029 to 2012-04-19.402."

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 21 April '12

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

1818	Grabbed MPEC 2012-H43 - 2001 QN142 = 2012 HP2 - see above
1623	Grabbed MPEC 2012-H42 - Observations and Orbits of Comets - see above
1548	Updated Traffic Report
1544	Noted that NEODyS has updated its 2012 DA14 risk assessment - see above Noted that JPL Sentry has updated its 2012 GV17 risk assessment - see above Noted that NEODyS has updated its 2012 GV17 risk assessment - see above Noted that JPL Sentry has updated its 2012 HG2 risk assessment - see above Grabbed MPEC 2012-H36 - Daily Orbit Update - see above Grabbed MPEC 2012-H37 - 2012 HN2 - see above Grabbed MPEC 2012-H38 - 2012 HO2 - see above Grabbed MPEC 2012-H39 - 2012 HP2 - see above Grabbed MPEC 2012-H40 - 2012 HQ2 - see above Grabbed MPEC 2012-H41 - 2012 HR2 - see above
0507	Noted that JPL Sentry has posted 2012 HG2 as an impact risk - see above

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