Contents  on 24 February '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 24 February '12

Six objects reported inside ten LD

There are six visitors reported moving within ten lunar distances (LD) of Earth today. Risk-listed 2012 CS46 enters Earth's Hill sphere. Further out, 2012 DZ is headed away from 4.60 to 7.95 LD, radar target 2012 DX is heading out from 5.66 to 7.94 LD, 2012 DX13 comes inside ten LD, moving from 10.22 to 5.98 LD, 2012 DY comes its closest to Earth this time around, reaching 9.22 LD at 0816 UTC, and radar target 2011 CP4 departs from inside ten LD, passing from 9.54 to 13.30 LD.

Up next, 2008 EJ85 arrives inside ten LD on March 4th.

This report was updated at 2155 UTC with new discovery 2012 DJ14 (MPEC) and, earlier, new discovery 2012 DA14 (MPEC), follow-up for 2012 DX in radar, and follow-up in today's DOU MPEC for 2012 DA14, 2012 DX13, and 2011 CP4. This report was previously updated at 0037, 0415, and 1555 UTC.


Notes: 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. See also today's timeline, current sky chart and object details (alt-details), and ephemerides.

Radar Astrometry  on 24 February '12

Radar observation of one object

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


Data update noted at 0023 UTC when the database was dated 23 Feb.

NEOCP Activity  on 24 February '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, thirteen were "one nighters." The Tracking News counted a total of 36 listings on the NEOCP on this day.

New MPECs  on 24 February '12

Minor Planet Electronic Circulars

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


<< OOC on 24 Feb. '12 >> MPEC 2012-D59 - "21:03 UT" - Observations and Orbits of Comets


MPEC 2012-D58 - "20:15 UT" - 2012 DN14


MPEC 2012-D57 - "20:13 UT" - 2012 DM14


MPEC 2012-D56 - "20:10 UT" - 2012 DL14


MPEC 2012-D55 - "20:08 UT" - 2012 DK14


MPEC 2012-D54 - "20:05 UT" - 2012 DJ14


<< DOU on 24 Feb. '12 >>  MPEC 2012-D53 - "06:03 UT" - Daily Orbit Update


MPEC 2012-D52 - "04:28 UT" - 2012 AS10


MPEC 2012-D51 - "01:59 UT" - 2012 DA14

Observers  on 24 February '12

A total of 76 observers appeared in this day's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 5 in MPEC 2012-D59 -- C/2012 CH17, C/2012 C2, C/2012 B3, P/2012 B1, C/2012 A2
J24Altamira Obs. in the Canary Islands, 20 in MPEC 2012-D59 -- C/2012 CH17, C/2012 C1, P/2012 B1, C/2012 A2, C/2012 A1, P/2011 W2, P/2011 W1, C/2011 L4, C/2011 J2, C/2011 G1, C/2011 F1, P/2010 UH55, P/2010 JC81, C/2010 G2, C/2009 P1, 242P, 164P, 117P, 78P, 49P
251Arecibo in Puerto Rico, 1 in radar -- 2012 DX
I47Auger Obs. in Argentina, 9 in MPECs 2012-D53 & 2012-D59 -- 2012 DO, C/2012 C1, C/2011 L4, C/2010 G2, C/2009 F4, 2008 EP6, C/2006 S3, 49P, 29P
A81Balzaretto Obs. in Italy, 1 in MPEC 2012-D53 -- 2012 DX13
B75Betelgeuse Station in Italy, 5 in MPEC 2012-D59 -- C/2012 CH17, C/2012 C2, C/2012 A2, C/2011 Q4, 78P
C86Blanes Obs. in Spain, 3 in MPEC 2012-D59 -- C/2011 F1, C/2009 P1, 78P
I99Blanquita Obs. in Spain, 1 in MPEC 2012-D59 -- 78P
B96Brixiis Obs. in Belgium, 7 in MPEC 2012-D59 -- P/2010 JC81, C/2010 G2, C/2009 P1, 246P, 164P, 78P, 29P
215Buchloe Obs. in Germany, 6 in MPEC 2012-D59 -- C/2012 CH17, C/2012 C2, P/2012 B1, C/2012 A2, P/2010 JC81, 171P
B66Casasco Obs. in Italy, 14 in MPEC 2012-D53 -- 2011 SL102, 99942, 175706, 137052, 7358, 5587, 4055, 3552, 3103, 2368, 1866, 1862, 1627, 1620
703Catalina Sky Survey (CSS) in Arizona, 23 in MPECs 2012-D53, 2012-D54, 2012-D58 & 2012-D59 -- 2012 DN14, 2012 DJ14, 2012 DH4, 2012 CR46, 2012 CC17, C/2012 C2, 2012 BJ134, 2012 BB124, P/2010 UH55, 237805, 208565, 152941, 143651, 142348, 141018, 138175, 3554, 3103, 1862, 244P, 164P, 117P, 49P
A77Chante-Perdrix Obs. in France, 3 in MPEC 2012-D59 -- C/2011 F1, C/2009 P1, 21P
J01Cielo Profundo Obs. in Spain, 9 in MPEC 2012-D59 -- C/2012 CH17, C/2012 A2, P/2011 W2, C/2011 UF305, C/2011 L4, P/2010 JC81, 164P, 49P, 29P
850Cordell-Lorenz Obs. in Tennessee, 6 in MPEC 2012-D59 -- P/2012 B1, C/2011 G1, C/2009 P1, 244P, 164P, 49P
106Crni Vrh Obs. in Slovenia, 2 in MPECs 2012-D53 & 2012-D59 -- C/2009 P1, 311554
958Dax Obs. in France, 23 in MPEC 2012-D59 -- C/2012 CH17, C/2012 C2, C/2012 B3, P/2012 B1, C/2012 A2, C/2012 A1, P/2011 W2, P/2011 W1, C/2011 F1, C/2010 S1, P/2010 JC81, C/2010 G2, C/2010 FB87, C/2009 P1, C/2008 S3, 246P, 244P, 164P, 123P, 78P, 49P, 29P, 21P
448Desert Moon Obs. in New Mexico, 6 in MPEC 2012-D53 -- 2012 CT, 2012 CL2, 2008 AV28, 2005 EJ, 190208, 162186
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 3 in MPECs 2012-D53 & 2012-D59 -- C/2012 CH17, 2011 CP4, C/2009 P1
J19El Maestrat Obs. in Spain, 3 in MPECs 2012-D53 & 2012-D59 -- P/2010 JC81, C/2009 P1, 24475
C74El Teatrillo de Lyra Obs. in Spain, 2 in MPEC 2012-D59 -- C/2011 F1, 49P
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-D59 -- C/2012 C2
E10Faulkes Telescope South in New South Wales, 2 in MPEC 2012-D59 -- P/2011 W2, 244P
C73Galati Obs. in Romania, 1 in MPEC 2012-D53 -- 2010 SV3
372Geisei Obs. in Japan, 5 in MPEC 2012-D59 -- P/2012 C3, C/2012 C2, C/2012 A2, C/2012 A1, P/2011 W2
B83Gieres Obs. in France, 1 in MPEC 2012-D59 -- 49P
E94Gisborne Obs. in New Zealand, 3 in MPEC 2012-D59 -- C/2011 L4, C/2009 F4, 29P
J95Great Shefford Obs. in England, 1 in MPEC 2012-D59 -- P/2003 T12
458Guadarrama Obs. in Spain, 2 in MPEC 2012-D59 -- 78P, 49P
511Haute Provence Obs. in Germany, 4 in MPEC 2012-D59 -- C/2012 CH17, P/2011 W2, 244P, 164P
D88Hiratsuka Obs. in Japan, 8 in MPEC 2012-D59 -- C/2012 CH17, C/2012 C2, C/2011 J2, C/2010 S1, C/2010 G2, C/2010 FB87, 117P, 49P
C32Ka-Dar Obs. TAU Station in Russia, 7 in MPEC 2012-D59 -- C/2012 C2, C/2011 Y3, C/2011 L4, P/2003 T12, 240P, 228P, 60P
585Kiev Comet Station in the Ukraine, 1 in MPEC 2012-D59 -- 78P
695{Tomas Vorobjov in England via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2012-D51 -- 2012 DA14
D95Kurihara Obs. in Japan, 3 in MPEC 2012-D59 -- C/2010 FB87, 49P, 29P
704LINEAR in New Mexico, 8 in MPECs 2012-D53 & 2012-D59 -- 2011 WV134, C/2011 J2, C/2010 R1, 1998 KN3, 142563, 4055, 1943, 1627
J75La Sagra Obs. in Spain, 1 in MPEC 2012-D51 -- 2012 DA14
J38La Vara Obs. in Spain, 11 in MPEC 2012-D59 -- C/2012 CH17, P/2012 B1, P/2011 W2, C/2011 F1, C/2010 G2, C/2009 P1, 244P, 164P, 78P, 49P, 29P
I72MPC code I72, 3 in MPEC 2012-D59 -- C/2010 G2, C/2009 P1, 78P
B82Maidbronn Obs. in Germany, 5 in MPEC 2012-D59 -- C/2012 C2, P/2011 W2, C/2011 G1, C/2010 S1, 176P
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-D59 -- P/2012 C3
213Montcabre Obs. in Spain, 2 in MPEC 2012-D59 -- C/2009 P1, 29P
945Monte Deva Obs. in Spain, 5 in MPEC 2012-D59 -- C/2011 F1, C/2009 P1, 78P, 49P, 29P
C91Montevenere Obs., 3 in MPECs 2012-D53 & 2012-D59 -- C/2012 CH17, 163000, 49P
900Moriyama Obs. in Japan, 12 in MPEC 2012-D59 -- C/2012 CH17, P/2012 B1, C/2012 A2, P/2011 W2, P/2010 JC81, C/2010 G2, 244P, 164P, 117P, 78P, 49P, 29P
G84Mt. Lemmon SkyCenter in Arizona, 1 in MPEC 2012-D53 -- 2012 AE1
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2012-D53, 2012-D55, 2012-D56 & 2012-D57 -- 2012 DM14, 2012 DL14, 2012 DK14, 2012 CR46, 2012 AS10
E07Murrumbateman Obs. in New South Wales, 8 in MPEC 2012-D59 -- C/2012 C1, P/2011 W2, C/2011 J2, P/2010 UH55, C/2009 F4, 91P, 29P, 17P
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2012-D52 -- 2012 AS10
J47Nazaret Obs. in Spain, 3 in MPEC 2012-D59 -- P/2011 W2, C/2010 G2, 49P
I89Nerpio Obs. in Italy, 2 in MPECs 2012-D53 & 2012-D59 -- 2012 DA14, C/2012 C2
C47Nonndorf Obs. in Austria, 4 in MPEC 2012-D59 -- C/2012 A2, C/2011 F1, C/2009 P1, 246P
C23Olmen Obs. in Belgium, 16 in MPEC 2012-D59 -- C/2012 CH17, C/2012 C2, P/2012 B1, C/2012 A2, P/2011 W2, C/2011 G1, P/2010 JC81, C/2010 G2, C/2009 P1, 244P, 164P, 117P, 78P, 49P, 29P, 21P
D92Osaki Obs. in Japan, 2 in MPEC 2012-D59 -- C/2012 C2, 78P
B49Paus Obs. in Spain, 1 in MPEC 2012-D59 -- 164P
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2012-D59 -- C/2012 CH17, C/2012 A2, 244P, 49P
5611Janos Kelemen via Piszkesteto Station in Hungary, 4 in MPEC 2012-D59 -- P/2011 W2, C/2011 G1, C/2008 FK75, 244P
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 14 in MPECs 2012-D53 & 2012-D59 -- C/2012 CH17, P/2012 C3, C/2012 C2, C/2012 C1, C/2012 A2, P/2011 Y2, P/2011 VJ5, C/2011 UF305, C/2010 FB87, P/2003 T12, 36236, 255P, 240P, 171P
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 12 in MPECs 2012-D53 & 2012-D59 -- 2012 DZ13, 2012 CR46, C/2012 C1, P/2012 B1, C/2011 L4, C/2010 B1, C/2009 F4, 246P, 244P, 242P, 123P, 49P
939Rodeno Obs. in Spain, 8 in MPEC 2012-D59 -- C/2012 C2, C/2011 F1, C/2010 G2, C/2009 P1, 246P, 78P, 49P, 29P
C09Rouet Obs. in France, 4 in MPEC 2012-D59 -- C/2011 F1, C/2009 P1, 246P, 49P
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2012-D51 -- 2012 DA14
C71Sant Marti Sesgueioles Obs. in Spain, 1 in MPEC 2012-D59 -- 246P
204Schiaparelli Obs. in Italy, 1 in MPEC 2012-D53 -- 2012 CR46
D93Sendai Obs. in Japan, 4 in MPEC 2012-D59 -- C/2012 C2, C/2010 G2, 164P, 78P
260&Rob Matson in southern California using the Siding Spring Digitized Sky Survey in New South Wales, 1 in MPEC 2012-D52 -- 2012 AS10
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-D53 -- 2008 VU4
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2012-D53 & 2012-D59 -- 2012 DG4, P/2011 VJ5, C/2011 J2, C/2010 R1, 2008 PF1, 153814, 228P
291Spacewatch 1.8m telescope in Arizona, 18 in MPECs 2012-D53, 2012-D55, 2012-D56, 2012-D57 & 2012-D58 -- 2012 DO8, 2012 DN14, 2012 DM14, 2012 DL14, 2012 DK14, 2012 DJ4, 2012 CR46, 2012 CO46, 2012 CM29, 2012 CL29, 2012 CL19, 2012 CA21, 2012 BR23, 2012 BJ86, 2012 BD77, 2012 BB124, 2011 UE305, 2009 MC9
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-D51 -- 2012 DA14
A71Stixendorf Obs. in Austria, 6 in MPEC 2012-D59 -- P/2012 B1, P/2011 W1, C/2009 P1, P/2003 T12, 78P, 21P
B51Vallauris Obs. in France, 7 in MPEC 2012-D59 -- C/2012 C2, C/2012 B3, C/2011 F1, C/2010 R1, C/2009 P1, 246P, 29P
H47Vicksburg Obs. in Mississippi, 3 in MPEC 2012-D59 -- 246P, 49P, 29P
G56Walnut Creek Obs. in northern California, 3 in MPEC 2012-D53 -- 2012 BB124, 278381, 275558
C42Xingming Obs. in China, 4 in MPEC 2012-D59 -- C/2012 C2, C/2011 F1, C/2010 G2, 78P
J08Zonalunar Obs. in Spain, 7 in MPEC 2012-D59 -- C/2012 CH17, C/2012 C2, C/2012 A2, P/2010 JC81, 164P, 78P, 49P
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 February '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 DA14JPL Sentry15522020-21122791.1e-04-3.72-4.740JPL #2 for the day: "Analysis based on 23 observations spanning .99675 days (2012-Feb-23.03431 to 2012-Feb-24.031057)." Diameter approximately 0.047 km. from mean, weighted H=24.3.
2012 DY13NEODyS15522060-207451.15e-07-8.27-8.570NEODyS: "Based on 44 optical observations (of which 0 are rejected as outliers) from 2012-02-22.255 to 2012-02-23.227."
2012 DXJPL Sentry0107R E M O V E DJPL: Risk listing removed at 0050 UTC.
2012 CA21JPL Sentry2359207311.8e-05-1.83-1.831JPL: "Analysis based on 72 observations spanning 11.981 days (2012-Feb-12.12022 to 2012-Feb-24.10139)." Diameter approximately 0.470 km. from mean, weighted H=19.3.
NEODyS15522073-207315.22e-06-2.37-2.371NEODyS: "Based on 72 optical observations (of which 3 are rejected as outliers) from 2012-02-12.121 to 2012-02-24.102."
2012 BJ86JPL Sentry1552211213.8e-07-4.96-4.960JPL: "Analysis based on 54 observations spanning 26.011 days (2012-Jan-29.10142 to 2012-Feb-24.11236)." Diameter approximately 0.160 km. from mean, weighted H=21.6.
NEODyS15522084-208421.04e-08-6.42-6.690NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2012-01-29.102 to 2012-02-24.113."
2011 UE305JPL Sentry1552210912.2e-09-7.02-7.020JPL: "Analysis based on 76 observations spanning 64.869 days (2011-Oct-30.46441 to 2012-Jan-03.33369)." Diameter approximately 0.190 km. from mean, weighted H=21.2.
2011 HJ7NEODyS1552R E M O V E D-

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 24 February '12

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

2359Noted that JPL Sentry has updated its 2012 CA21 risk assessment - see above
2155Updated Traffic Report
2124Grabbed MPEC 2012-D59 - Observations and Orbits of Comets - see above
2036Grabbed MPEC 2012-D55 - 2012 DK14 - see above
Grabbed MPEC 2012-D56 - 2012 DL14 - see above
Grabbed MPEC 2012-D57 - 2012 DM14 - see above
Grabbed MPEC 2012-D58 - 2012 DN14 - see above
2007Grabbed MPEC 2012-D54 - 2012 DJ14 - see above
1552Noted that NEODyS has removed 2011 HJ7 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 UE305 risk assessment - see above
Noted that JPL Sentry has updated its 2012 BJ86 risk assessment - see above
Noted that NEODyS has updated its 2012 BJ86 risk assessment - see above
Noted that NEODyS has updated its 2012 CA21 risk assessment - see above
Noted that JPL Sentry has updated its 2012 DA14 risk assessment - see above
Noted that NEODyS has posted 2012 DY13 as an impact risk - see above
Grabbed MPEC 2012-D53 - Daily Orbit Update - see above
0547Noted that JPL Sentry has posted 2012 DA14 as an impact risk - see above
Grabbed MPEC 2012-D52 - 2012 AS10 - see above
0231Grabbed MPEC 2012-D51 - 2012 DA14 - see above
0107Noted that JPL Sentry has removed 2012 DX as an impact risk - see above
0023Noted Radar Astrometry database update - see above