Contents  on 2 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 2 March '12

Seven objects reported inside ten LD

Seven visitors are reported moving inside ten lunar distances (LD) of our planet today. 2012 EA flies from 3.09 to 2.67 LD within Earth's Hill sphere, which 2012 DS32 exits. Further away, 2012 DN31 is heading out from 8.02 to 8.24 LD, risk-listed 2012 CS46 is calculated with great uncertainty to leave ten LD, 2012 DH54 travels from 9.7 to 8.7 LD*, 2012 DR32 comes its closest to Earth this time around, reaching 8.68 LD at 1649 UTC, and 2012 DU60 moves from 9.5 to 9.2 LD*.

Coming our way, risk-listed 2012 DW60 arrives inside ten LD on March 4th, the day that 2008 EJ85 is calculated with some uncertainty to return, and 2007 HV4 comes inside on April 14th.

This report was updated at 1926 UTC to note that we missed 2012 DW43, which may have been just inside ten LD during 15-19 February and has only been reported observed in MPEC 2012-D96 of the 28th. Previously today we noted follow-up in today's DOU MPEC for 2012 EA, 2012 DJ54, 2012 DN31, and 2012 DA14, along with follow-up for departed 2011 CP4 in radar, with updates at 0028, 0626, and 1702 UTC.


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.

Radar Astrometry  on 2 March '12

Radar observation of two objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 0107 UTC when the database was dated 1 March


Data update noted at 0248 UTC when the database was dated 1 March

NEOCP Activity  on 2 March '12

The MPC's NEO Confirmation Page has 10 listings

When last checked at 2316 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had ten objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of nineteen listings on the NEOCP today.

New MPECs  on 2 March '12

Minor Planet Electronic Circulars

As of last check at 2316 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< OOC on 2 Mar. '12 >> MPEC 2012-E18 - "23:05 UT" - Observations and Orbits of Comets


MPEC 2012-E17 - "20:17 UT" - 2012 EC


<< DOU on 2 Mar. '12 >>  MPEC 2012-E16 - "06:04 UT" - Daily Orbit Update


MPEC 2012-E15 - "02:56 UT" - 2012 DK61


MPEC 2012-E14 - "02:01 UT" - Comet C/2012 BJ98


MPEC 2012-E13 - "00:26 UT" - 2012 EB

Observers  on 2 March '12

A total of 60 observers appear in today's MPECs.

CodeObserver / observatory
J97Alginet Obs. in Spain, 4 in MPECs 2012-E16 & 2012-E18 -- 6050, 3103, 1627, 49P
B37Ametlla del Valles Obs. in Spain, 1 in MPEC 2012-E18 -- 240P
251Arecibo in Puerto Rico, 2 in radar -- 2011 CP4, 2002 QC7
I92Astreo Obs., 1 in MPEC 2012-E18 -- C/2009 P1
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2012-E16 -- 2012 DW32, 2012 DV32, 2012 DQ8, 2012 DL31, 2012 DJ31, 2012 DG31
J51Atlante Obs. in the Canary Islands, 5 in MPEC 2012-E18 -- C/2011 J2, C/2009 P1, 246P, 164P, 29P
C77Bernezzo Obs. in Italy, 1 in MPEC 2012-E16 -- 24475
B75Betelgeuse Station in Italy, 2 in MPEC 2012-E18 -- C/2012 CH17, C/2012 A2
B96Brixiis Obs. in Belgium, 7 in MPEC 2012-E18 -- P/2010 JC81, C/2010 G2, C/2009 P1, 246P, 244P, 164P, 29P
215Buchloe Obs. in Germany, 1 in MPEC 2012-E18 -- 243P
703Catalina Sky Survey (CSS) in Arizona, 15 in MPECs 2012-E13, 2012-E14, 2012-E16 & 2012-E18 -- 2012 EB, 2012 DN31, 2012 DH4, C/2012 CH17, C/2012 BJ98, 2012 BC20, 2007 DK, 2005 AH14, 237805, 21277, 143651, 141018, 137925, 117P, 49P
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2012-E16 -- 2012 DJ31
A77Chante-Perdrix Obs. in France, 6 in MPEC 2012-E18 -- C/2011 F1, C/2010 G2, C/2009 P1, 78P, 49P, 21P
J01Cielo Profundo Obs. in Spain, 3 in MPEC 2012-E18 -- C/2011 F1, C/2009 P1, 246P
C13Como Obs. in Italy, 1 in MPEC 2012-E16 -- 2012 DQ8
850Cordell-Lorenz Obs. in Tennessee, 2 in MPEC 2012-E18 -- C/2009 P1, 49P
958Dax Obs. in France, 1 in MPEC 2012-E18 -- C/2008 S3
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-E18 -- C/2009 P1
151Eschenberg Obs. in Switzerland, 2 in MPECs 2012-E13 & 2012-E18 -- 2012 EB, C/2009 P1
203GiaGa Obs. in Italy, 3 in MPECs 2012-E13 & 2012-E16 -- 2012 EB, 2002 AW, 85990
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2011 CP4
511Haute Provence Obs. in Germany, 8 in MPEC 2012-E18 -- C/2012 CH17, P/2012 B1, C/2012 A2, C/2011 Q4, P/2010 JC81, C/2009 P1, 164P, 49P
H15ISON-NM Obs. in New Mexico, 2 in MPECs 2012-E16 & 2012-E18 -- 2012 DA14, 49P
695]Mark Trueblood via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2012-E16 -- 2011 AX22, 2008 OX1
D95Kurihara Obs. in Japan, 4 in MPEC 2012-E18 -- C/2012 CH17, C/2012 C2, C/2010 FB87, 78P
704LINEAR in New Mexico, 11 in MPECs 2012-E16 & 2012-E18 -- 2012 DF61, C/2012 B3, 2011 YV15, P/2010 JC81, 32906, 312942, 189008, 152667, 6050, 5587, 3554
J38La Vara Obs. in Spain, 8 in MPEC 2012-E18 -- C/2012 CH17, P/2012 B1, C/2011 F1, C/2010 G2, 244P, 78P, 49P, 29P
J131National Schools Obs. via the Liverpool Telescope in the Canary Islands, 7 in MPEC 2012-E16 -- 2011 YM63, 2011 XD1, 2011 XC, 2011 WN2, 2011 NY, 2011 HQ, 2011 HO
130Lumezzane Obs. in Italy, 4 in MPEC 2012-E18 -- C/2012 C2, P/2012 B1, C/2012 A1, P/2010 JC81
B90Malina River Obs. in Italy, 1 in MPEC 2012-E18 -- C/2009 UG89
B67Mirasteilas Obs. in Switzerland, 6 in MPEC 2012-E16 -- 2012 CC17, 2012 BJ11, 2012 BC20, 2011 SL102, 2006 VY13, 2004 QJ7
118Modra Obs. in Slovakia, 1 in MPEC 2012-E18 -- C/2012 B3
213Montcabre Obs. in Spain, 6 in MPEC 2012-E18 -- C/2012 CH17, P/2012 B1, C/2012 A2, C/2011 F1, C/2009 P1, 29P
945Monte Deva Obs. in Spain, 5 in MPEC 2012-E18 -- C/2011 F1, C/2009 P1, 78P, 49P, 29P
C91Montevenere Obs., 2 in MPECs 2012-E16 & 2012-E18 -- C/2012 CH17, 141018
B06Montseny Obs. in Spain, 2 in MPEC 2012-E18 -- C/2009 P1, 29P
900Moriyama Obs. in Japan, 5 in MPEC 2012-E18 -- C/2012 CH17, C/2012 A2, C/2011 J2, C/2011 F1, C/2009 P1
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2012-E14, 2012-E16, 2012-E17 & 2012-E18 -- 2012 EC, C/2012 BJ98, 2011 YM63, 2008 ER, 2004 BD68, 2000 JO78, 310737, 5693, 60P
D81Nagano Obs. in Japan, 1 in MPEC 2012-E18 -- 117P
C23Olmen Obs. in Belgium, 6 in MPEC 2012-E18 -- C/2012 CH17, C/2011 F1, C/2009 P1, 246P, 164P, 49P
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2012-E14, 2012-E15 & 2012-E18 -- 2012 DK61, C/2012 BJ98, P/2011 VJ5, P/2010 UH55, 228P, 29P
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 20 in MPECs 2012-E16 & 2012-E18 -- 2012 DQ8, C/2012 CH17, 2012 CD29, 2012 BJ134, P/2012 B1, 2011 YV15, 2011 SL102, C/2011 G1, C/2011 F1, 2010 SV3, C/2009 P1, 2004 QJ7, 85990, 263976, 163000, 101873, 1862, 164P, 49P, 29P
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 2 in MPEC 2012-E18 -- P/2011 C2, 256P
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 3 in MPEC 2012-E18 -- 246P, 117P, 49P
J41Raheny Obs. in Ireland, 1 in MPEC 2012-E13 -- 2012 EB
C09Rouet Obs. in France, 2 in MPEC 2012-E18 -- C/2012 A2, 49P
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2012-E13 -- 2012 EB
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-E16 -- 2012 DA14
B70Sant Celoni Obs. in Spain, 2 in MPEC 2012-E18 -- C/2012 CH17, 49P
204Schiaparelli Obs. in Italy, 11 in MPECs 2012-E13, 2012-E16 & 2012-E18 -- 2012 EB, 2012 EA, C/2012 CH17, C/2012 C2, C/2012 BJ98, P/2012 B1, 2011 SO26, 2009 QE8, 2008 PF1, P/2003 T12, 2003 FH1
G68Sierra Stars Obs. in northern California, 1 in MPEC 2012-E18 -- C/2009 P1
691Spacewatch 0.9m telescope in Arizona, 8 in MPECs 2012-E14, 2012-E15, 2012-E16 & 2012-E18 -- 2012 DK61, C/2012 BJ98, P/2011 C2, 2007 UR3, 2002 CW46, 238063, 16912, 141531
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2012-E15 & 2012-E16 -- 2012 DZ32, 2012 DY43, 2012 DK61, 2012 DJ54, 2011 SO32, 99799
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2012-E13 & 2012-E15 -- 2012 EB, 2012 DK61
A71Stixendorf Obs. in Austria, 5 in MPEC 2012-E18 -- C/2012 CH17, C/2012 C2, C/2012 A2, 246P, 21P
A03Torredembarra Obs. in Spain, 1 in MPEC 2012-E18 -- 49P
B51Vallauris Obs. in France, 3 in MPEC 2012-E18 -- C/2012 CH17, C/2011 F1, C/2009 P1
H47Vicksburg Obs. in Mississippi, 3 in MPEC 2012-E18 -- 246P, 49P, 29P
D20Zadko Obs. in Western Australia, 1 in MPEC 2012-E18 -- C/2010 FB87
J08Zonalunar Obs. in Spain, 1 in MPEC 2012-E18 -- P/2010 JC81
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 March '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2316 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 ECJPL Sentry23162017-21113032.5e-05-3.99-4.290JPL: "Analysis based on 10 observations spanning 1.0688 days (2012-Mar-01.3419 to 2012-Mar-02.41071)." Diameter approximately 0.065 km. from mean, weighted H=23.6.
2012 DG61JPL Sentry01072028-2110133.5e-09-4.44-4.720JPL: "Analysis based on 26 observations spanning 2.6073 days (2012-Feb-28.32729 to 2012-Mar-01.93457)." Diameter approximately 1.095 km. from mean, weighted H=17.4.
2012 DW60NEODyS17012065-2090484.63e-06-6.27-6.880NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2012-02-29.495 to 2012-03-01.450."
2012 DJ54JPL Sentry17012068-210299.2e-05-6.15-6.390JPL: "Analysis based on 15 observations spanning 2.9304 days (2012-Feb-27.46779 to 2012-Mar-01.39817)." Diameter approximately 0.006 km. from mean, weighted H=28.7.
NEODyS17012068-208654.74e-05-6.36-6.410NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2012-02-27.469 to 2012-03-01.399."
2012 DY43NEODyS1701R E M O V E D-
2012 DA14JPL Sentry17012020-2042277.0e-05-3.58-4.030JPL: "Analysis based on 82 observations spanning 7.4575 days (2012-Feb-23.03431 to 2012-Mar-01.49183)." Diameter approximately 0.044 km. from mean, weighted H=24.4.
NEODyS17012020-20903353.47e-04-3.17-3.960NEODyS: "Based on 76 optical observations (of which 3 are rejected as outliers) from 2012-02-23.029 to 2012-03-01.098."
2011 AX22JPL Sentry1701R E M O V E DJPL: Risk listing removed at 1003 UTC.

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 2 March '12

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

2316Noted that JPL Sentry has posted 2012 EC as an impact risk - see above
Grabbed MPEC 2012-E18 - Observations and Orbits of Comets - see above
2103Grabbed MPEC 2012-E17 - 2012 EC - see above
1926Updated Traffic Report
1701Noted that JPL Sentry has removed 2011 AX22 as an impact risk - see above
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 DJ54 risk assessment - see above
Noted that NEODyS has updated its 2012 DJ54 risk assessment - see above
Noted that NEODyS has posted 2012 DW60 as an impact risk - see above
Noted that NEODyS has removed 2012 DY43 as an impact risk - see above
Grabbed MPEC 2012-E16 - Daily Orbit Update - see above
0602Grabbed MPEC 2012-E15 - 2012 DK61 - see above
0248Grabbed MPEC 2012-E14 - Comet C/2012 BJ98 - see above
Noted Radar Astrometry database update - see above
0107Noted that JPL Sentry has posted 2012 DG61 as an impact risk - see above
Noted Radar Astrometry database update - see above
0027Grabbed MPEC 2012-E13 - 2012 EB - see above