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Contents  on 3 April '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.

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Traffic Report  on 3 April '12

Nine objects reported inside ten LD

Nine objects are reported to be inside ten lunar distances (LD) of Earth today. Within Earth's Hill sphere, risk-listed 2012 FA57 enters the sphere, passing from 4.08 to 2.19 LD, radar target intruder 2012 EG5 exits the sphere, sliding from 3.08 to 4.94 LD, and 2012 FH58 comes its closest to Earth this time around, reaching 3.65 LD at 2113 UTC.

Further away, intruder 2012 FS35 is outbound from 5.71 to 6.47 LD, 2012 FQ62 from 5.71 to 8.09 LD, 2012 FV23 from 8.39 to 9.30 LD, and 2012 FS52 from 8.88 to 9.84 LD. 2012 FW35 leaves ten LD, flying from 9.0 to 10.4 LD*, as does 2012 FT35, moving from 9.26 to 10.22 LD.

Coming toward Earth next, risk-listed 2012 GD arrives inside ten LD on April 8th and returning 2007 HV4 on April 14th.

This report was posted at 1630 UTC with follow-up in today's DOU MPEC for 2012 FQ62, 2012 FH58, 2012 FA57, and 2012 EG5.

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. "LD*" indicates some passage uncertainty. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

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NEOCP Activity  on 3 April '12

The MPC's NEO Confirmation Page has 25 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 25 objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of 35 listings on the NEOCP today.

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New MPECs  on 3 April '12

Minor Planet Electronic Circulars

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


MPEC 2012-G19 - "20:56 UT" - 2012 FM52


<< OOC on 3 Apr. '12 >> MPEC 2012-G18 - "20:37 UT" - Observations and Orbits of Comets


<< DOU on 3 Apr. '12 >>  MPEC 2012-G17 - "06:04 UT" - Daily Orbit Update

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Observers  on 3 April '12

A total of 87 observers appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 25 in MPEC 2012-G18 -- P/2012 F2, C/2012 F1, C/2012 E3, C/2012 E1, P/2011 W2, P/2011 VJ5, C/2011 UF305, P/2011 UA134, C/2011 R1, C/2011 Q4, C/2011 L4, C/2010 S1, P/2010 JC81, C/2010 G2, C/2010 FB87, C/2008 FK75, 255P, 213P, 164P, 130P, 78P, 73P, 49P, 48P, 21P
J24Altamira Obs. in the Canary Islands, 11 in MPEC 2012-G18 -- C/2012 CH17, C/2012 A2, C/2011 J2, C/2011 F1, P/2010 UH55, C/2009 P1, 246P, 244P, 164P, 117P, 49P
H21Astronomical Research Obs. Westfield in Illinois, 26 in MPEC 2012-G17 -- 2012 FZ44, 2012 FZ23, 2012 FR35, 2012 FQ62, 2012 FQ52, 2012 FQ35, 2012 FP62, 2012 FP52, 2012 FO52, 2012 FN62, 2012 FN52, 2012 FJ, 2012 FH58, 2012 FG58, 2012 ES14, 2012 EL5, 2012 EA2, 2012 DO, 2012 DK61, 2012 BJ11, 2012 AA11, 2011 SL102, 2011 QD48, 2004 QJ7, 2004 FF29, 2000 DQ110
I47Auger Obs. in Argentina, 14 in MPECs 2012-G17 & 2012-G18 -- 2012 FY23, C/2011 S2, C/2011 R1, C/2011 O1, C/2011 L4, C/2011 A3, C/2010 R1, C/2010 G2, C/2009 F4, C/2006 S3, 246P, 78P, 49P, 29P
621Bergisch Gladbach Obs. in Germany, 2 in MPEC 2012-G18 -- P/2011 C2, 162P
C77Bernezzo Obs. in Italy, 2 in MPEC 2012-G18 -- C/2011 F1, 49P
B75Betelgeuse Station in Italy, 6 in MPEC 2012-G18 -- C/2012 CH17, C/2012 A2, C/2011 J2, C/2011 F1, C/2010 R1, P/2010 JC81
C86Blanes Obs. in Spain, 3 in MPEC 2012-G18 -- C/2011 F1, C/2009 P1, 49P
I99Blanquita Obs. in Spain, 2 in MPEC 2012-G18 -- C/2011 F1, C/2009 P1
B59Borken Obs. in Germany, 1 in MPEC 2012-G18 -- 246P
215Buchloe Obs. in Germany, 7 in MPEC 2012-G18 -- P/2012 F5, C/2012 E3, C/2012 BJ98, C/2012 B3, C/2009 P1, 164P, 49P
160Castelmartini Obs. in Italy, 10 in MPEC 2012-G18 -- C/2012 CH17, C/2012 A2, C/2011 UF305, C/2011 F1, P/2010 JC81, 246P, 244P, 164P, 78P, 49P
703Catalina Sky Survey (CSS) in Arizona, 16 in MPECs 2012-G17 & 2012-G18 -- P/2012 F2, C/2012 F1, C/2012 CH17, C/2012 A1, 2011 YV15, C/2011 R1, C/2011 J2, C/2010 R1, 2010 LR33, C/2006 S3, C/2005 L3, 263976, 24475, 137925, 103P, 49P
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2012-G17 -- 2012 FR62, 2012 FQ52, 2012 FO62, 2012 FG58, 2012 EK8, 2011 YM63
A77Chante-Perdrix Obs. in France, 1 in MPEC 2012-G18 -- C/2009 P1
J01Cielo Profundo Obs. in Spain, 6 in MPEC 2012-G18 -- C/2011 UF305, C/2011 L4, C/2011 F1, C/2009 P1, 49P, 29P
850Cordell-Lorenz Obs. in Tennessee, 3 in MPEC 2012-G18 -- C/2011 J2, 117P, 49P
106Crni Vrh Obs. in Slovenia, 2 in MPEC 2012-G18 -- C/2011 G1, C/2011 F1
958Dax Obs. in France, 19 in MPEC 2012-G18 -- C/2012 CH17, C/2012 B3, C/2012 A2, C/2011 UF305, C/2011 J2, C/2011 F1, C/2010 S1, C/2010 R1, P/2010 JC81, C/2010 FB87, C/2009 P1, C/2006 S3, 246P, 164P, 152P, 117P, 78P, 49P, 29P
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-G18 -- C/2012 CH17
J19El Maestrat Obs. in Spain, 1 in MPEC 2012-G18 -- C/2009 P1
F655David Asher in Northern Ireland via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-G19 -- 2012 FM52
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-G17 -- 2012 EG5
372Geisei Obs. in Japan, 9 in MPEC 2012-G18 -- P/2012 F5, C/2012 F3, C/2012 F1, P/2012 B1, C/2012 A2, C/2012 A1, C/2011 S2, C/2011 L4, P/2005 JY126
203GiaGa Obs. in Italy, 1 in MPEC 2012-G18 -- C/2012 CH17
B83Gieres Obs. in France, 2 in MPEC 2012-G18 -- C/2011 F1, C/2009 P1
J95Great Shefford Obs. in England, 2 in MPECs 2012-G17 & 2012-G18 -- 2012 FA57, C/2012 F1
511Haute Provence Obs. in Germany, 3 in MPEC 2012-G18 -- P/2012 F5, C/2012 CH17, 49P
D88Hiratsuka Obs. in Japan, 12 in MPEC 2012-G18 -- C/2012 CH17, C/2012 BJ98, C/2011 UF305, C/2011 L4, C/2011 J2, C/2011 F1, C/2011 A3, C/2009 P1, 246P, 164P, 117P, 49P
C43Hoyerswerda Obs., 1 in MPEC 2012-G18 -- C/2009 P1
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-G18 -- C/2011 R1
987Isle of Man Obs. on the Isle of Man, 1 in MPEC 2012-G18 -- C/2010 G2
585Kiev Comet Station in the Ukraine, 10 in MPECs 2012-G17 & 2012-G18 -- C/2012 CH17, C/2012 B3, C/2011 J2, C/2011 F1, C/2006 S3, 5587, 244P, 164P, 78P, 29P
046Klet Obs. in the Czech Republic, 2 in MPEC 2012-G18 -- C/2009 P1, 29P
D95Kurihara Obs. in Japan, 8 in MPEC 2012-G18 -- C/2012 F1, C/2012 A2, C/2011 J2, C/2011 F1, 117P, 78P, 49P, 29P
704LINEAR in New Mexico, 11 in MPECs 2012-G17 & 2012-G18 -- 2012 DO, C/2012 B3, P/2011 VJ5, C/2011 F1, C/2010 FB87, C/2009 UG89, C/2009 P1, 89959, 263976, 138359, 244P
J87La Canada Obs. in Spain, 1 in MPEC 2012-G18 -- C/2012 BJ98
J38La Vara Obs. in Spain, 7 in MPEC 2012-G18 -- C/2011 F1, C/2009 P1, 246P, 117P, 78P, 49P, 29P
A14Les Engarouines Obs. in France, 1 in MPEC 2012-G18 -- 117P
130Lumezzane Obs. in Italy, 1 in MPEC 2012-G18 -- C/2011 Q4
560Madonna di Dossobuono Obs. in Italy, 1 in MPEC 2012-G18 -- C/2009 P1
B82Maidbronn Obs. in Germany, 3 in MPEC 2012-G18 -- C/2012 A1, C/2009 P1, 244P
C10Maisoncelles Obs. in France, 15 in MPEC 2012-G18 -- P/2012 F5, C/2012 CH17, C/2012 BJ98, C/2012 B3, P/2012 B1, C/2012 A2, C/2011 UF305, C/2011 Q4, C/2010 S1, P/2010 JC81, 164P, 152P, 49P, 31P, 29P
B90Malina River Obs. in Italy, 1 in MPEC 2012-G18 -- 246P
J98Manises Obs. in Spain, 1 in MPEC 2012-G18 -- C/2009 P1
B10Mas des Gres Obs., 1 in MPEC 2012-G18 -- 49P
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-G18 -- P/2012 C3
213Montcabre Obs. in Spain, 7 in MPEC 2012-G18 -- P/2012 F5, C/2011 UF305, C/2011 F1, C/2009 P1, C/2006 S3, 49P, 29P
945Monte Deva Obs. in Spain, 4 in MPEC 2012-G18 -- C/2011 F1, C/2009 P1, 49P, 29P
900Moriyama Obs. in Japan, 11 in MPEC 2012-G18 -- C/2012 CH17, C/2012 B3, C/2012 A2, C/2011 F1, C/2010 R1, C/2009 P1, 246P, 152P, 78P, 49P, 29P
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2012-G18 -- C/2012 A2, P/2011 VJ5, C/2007 D1, 228P, 117P
E07Murrumbateman Obs. in New South Wales, 6 in MPEC 2012-G18 -- P/2012 C3, C/2012 BJ98, P/2012 B1, P/2011 W2, C/2011 J2, 17P
A13Naef Obs. in Switzerland, 1 in MPEC 2012-G18 -- P/2012 F5
D81Nagano Obs. in Japan, 3 in MPEC 2012-G18 -- C/2012 CH17, C/2011 J2, 246P
A24New Millennium Obs. in Italy, 1 in MPEC 2012-G17 -- 6455
0892program code 2 via Nikolaev Obs. in the Ukraine, 5 in MPEC 2012-G18 -- C/2011 F1, C/2009 P1, 246P, 49P, 29P
C47Nonndorf Obs. in Austria, 5 in MPEC 2012-G18 -- C/2012 A2, C/2011 F1, C/2009 P1, 246P, 49P
583Odessa-Mayaki Obs. in the Ukraine, 1 in MPEC 2012-G18 -- 29P
411Oizumi Obs. in Japan, 2 in MPEC 2012-G18 -- C/2011 L4, 29P
C23Olmen Obs. in Belgium, 14 in MPEC 2012-G18 -- C/2012 CH17, C/2012 B3, C/2012 A2, C/2011 UF305, C/2011 F1, C/2010 S1, C/2009 P1, C/2006 S3, 246P, 164P, 117P, 78P, 49P, 29P
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPECs 2012-G17, 2012-G18 & 2012-G19 -- 2012 FN62, 2012 FM52, C/2012 E3, C/2012 A2, C/2011 J2, P/2010 JC81, 2008 UC, 2008 QT3, 2001 HA8, 1994 NK, 246P, 103P, 29P
B49Paus Obs. in Spain, 3 in MPEC 2012-G18 -- C/2012 B3, C/2011 F1, 49P
H23Pear Tree Obs. in Florida, 2 in MPEC 2012-G18 -- C/2011 F1, 49P
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 13 in MPECs 2012-G17 & 2012-G18 -- 2012 FJ, 2012 DX75, 2012 DU30, C/2012 CH17, 2012 BC20, C/2012 A2, C/2011 F1, C/2009 P1, 2006 VY13, 2004 FG11, 2004 FF29, 49P, 29P
I78Principia Obs., 1 in MPEC 2012-G18 -- C/2009 P1
C20Pulkovo Obs. Kislovodsk Mtn. Station in Russia, 1 in MPEC 2012-G18 -- 49P
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2012-G18 -- P/2011 U2
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 7 in MPEC 2012-G18 -- C/2012 F6, P/2012 F5, C/2012 F1, C/2012 E3, C/2012 E1, C/2011 L4, P/2005 JY126
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 5 in MPEC 2012-G18 -- C/2012 CH17, C/2012 C1, C/2006 S3, 246P, 117P
D03Rantiga Obs., 2 in MPEC 2012-G18 -- C/2012 F6, 49P
C09Rouet Obs. in France, 6 in MPEC 2012-G18 -- C/2012 A2, C/2011 J2, C/2011 F1, C/2009 P1, 246P, 49P
461SZTE Asteroid Program in Hungary, 1 in MPEC 2012-G18 -- C/2011 F1
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2012-G18 -- C/2012 F1
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-G18 -- C/2012 F1
B56Sant Pere Obs. in Spain, 4 in MPEC 2012-G18 -- C/2011 F1, C/2009 P1, C/2006 S3, 29P
204Schiaparelli Obs. in Italy, 3 in MPEC 2012-G18 -- C/2012 F1, C/2012 B3, C/2011 UF305
E12Siding Spring Survey (SSS) in New South Wales, 5 in MPEC 2012-G17 -- 2012 FE58, 2012 EG5, 318411, 3554, 1580
510Siegen Obs. in Germany, 1 in MPEC 2012-G18 -- 49P
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2012-G17 & 2012-G18 -- C/2012 E1, 2011 YV15, P/2011 C2, P/2005 JY126
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2012-G17 & 2012-G19 -- 2012 FR1, 2012 FO62, 2012 FM52, 2012 FA57, 2006 PY17
A71Stixendorf Obs. in Austria, 10 in MPEC 2012-G18 -- C/2012 E3, C/2012 CH17, C/2011 UF305, C/2011 Q2, C/2011 L4, C/2011 F1, C/2009 P1, C/2006 S3, 152P, 49P
B51Vallauris Obs. in France, 9 in MPEC 2012-G18 -- C/2012 CH17, C/2012 A2, C/2011 F1, P/2010 JC81, C/2009 P1, 246P, 164P, 49P, 29P
H47Vicksburg Obs. in Mississippi, 3 in MPEC 2012-G18 -- C/2010 R1, C/2006 S3, 29P
C90Vinyols Obs., 3 in MPEC 2012-G18 -- C/2009 P1, 49P, 29P
C28Wellinghofen Obs. in Germany, 1 in MPEC 2012-G18 -- C/2009 P1
C42Xingming Obs. in China, 3 in MPEC 2012-G18 -- P/2012 F5, C/2009 P1, P/2005 JY126
367Yatsuka Obs. in Japan, 4 in MPEC 2012-G18 -- C/2012 CH17, P/2010 JC81, 78P, 21P
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

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Impact Risk Monitoring  on 3 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 GDNEODyS16292017-20901601.17e-05-5.72-6.110NEODyS: "Based on 12 optical observations (of which 1 are rejected as outliers) from 2012-04-01.345 to 2012-04-02.335."
2012 FA57JPL Sentry16292076-208021.3e-09-9.49-9.640JPL: "Analysis based on 36 observations spanning 5.9898 days (2012-Mar-28.18963 to 2012-Apr-03.17944)." Diameter approximately 0.021 km. from mean, weighted H=26.0.
NEODyS1629R E M O V E D-
2012 FM52JPL Sentry23592064-208481.1e-09-5.71-6.360JPL: "Analysis based on 10 observations spanning 3.0794 days (2012-Mar-31.53438 to 2012-Apr-03.61381)." Diameter approximately 0.701 km. from mean, weighted H=18.4.
2011 AG5JPL Sentry20042040-204742.0e-03-1.00-1.011JPL: "Analysis based on 210 observations spanning 316.77 days (2010-Nov-08.629742 to 2011-Sep-21.398727)." Diameter approximately 0.140 km. from mean, weighted H=21.8.

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.

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Chronology  on 3 April '12

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

2359Noted that JPL Sentry has posted 2012 FM52 as an impact risk - see above
2135Grabbed MPEC 2012-G19 - 2012 FM52 - see above
2043Grabbed MPEC 2012-G18 - Observations and Orbits of Comets - see above
2004Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
1630Posted Traffic Report
1629Noted that JPL Sentry has updated its 2012 FA57 risk assessment - see above
Noted that NEODyS has removed 2012 FA57 as an impact risk - see above
Noted that NEODyS has posted 2012 GD as an impact risk - see above
Grabbed MPEC 2012-G17 - Daily Orbit Update - see above