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Contents  on 26 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.

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Traffic Report  on 26 February '12

Three objects reported inside ten LD

There are three asteroids reported passing within ten lunar distances (LD) of Earth today. Inside Earth's Hill sphere, risk-listed 2012 CS46 travels from 2.7 to 3.2 LD*. Further away, radar target 2012 DX13 is heading out from 5.24 to 8.91 LD and 2012 DY departs from inside ten LD, passing from 9.85 to 10.78 LD.

On approach, 2012 DN31 arrives inside ten LD tomorrow and 2008 EJ85 comes inside ten LD on March 4th.

This report was updated at 0038 Feb. 27th UTC with new discovery 2012 DN31 (MPEC) and, earlier, follow-up in today's DOU MPEC for 2012 DA14 and 2012 DX13. This report was previously updated at 0655 and 1641 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.

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NEOCP Activity  on 26 February '12

The MPC's NEO Confirmation Page has 57 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 57 objects listed. Of these, 29 were "one nighters." The Tracking News counted a total of 83 listings on the NEOCP on this day.

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New MPECs  on 26 February '12

Minor Planet Electronic Circulars

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


MPEC 2012-D74 - "21:12 UT" - 2012 DN31


MPEC 2012-D73 - "21:10 UT" - 2012 DL31


MPEC 2012-D72 - "21:08 UT" - 2012 DK31


MPEC 2012-D71 - "21:06 UT" - 2012 DJ31


MPEC 2012-D70 - "21:03 UT" - 2012 DG31


MPEC 2012-D69 - "21:00 UT" - 2012 DF31


MPEC 2012-D68 - "20:57 UT" - 2012 DE31


MPEC 2012-D67 - "18:40 UT" - 2012 DR30


MPEC 2012-D66 - "18:37 UT" - 2012 DW30


MPEC 2012-D65 - "18:34 UT" - 2012 DS30


MPEC 2012-D64 - "18:31 UT" - 2012 DP30


<< DOU on 26 Feb. '12 >>  MPEC 2012-D63 - "06:04 UT" - Daily Orbit Update


MPEC 2012-D62 - "03:03 UT" - 2012 DC28

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Observers  on 26 February '12

A total of 50 observers appeared in this day's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-D67 -- 2012 DR30
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2012-D65, 2012-D66, 2012-D68, 2012-D69, 2012-D72, 2012-D73 & 2012-D74 -- 2012 DW30, 2012 DS30, 2012 DN31, 2012 DL31, 2012 DK31, 2012 DF31, 2012 DE31
I47Auger Obs. in Argentina, 1 in MPEC 2012-D67 -- 2012 DR30
300Bisei Spaceguard Center in Japan, 2 in MPECs 2012-D72 & 2012-D74 -- 2012 DN31, 2012 DK31
B66Casasco Obs. in Italy, 11 in MPEC 2012-D63 -- 2011 SL102, 12923, 8567, 6050, 5620, 5587, 4055, 3103, 2368, 1862, 1627
703Catalina Sky Survey (CSS) in Arizona, 23 in MPECs 2012-D63, 2012-D64, 2012-D66, 2012-D68 & 2012-D70 -- 2012 DW30, 2012 DP30, 2012 DG31, 2012 DE31, 2012 CD29, 2012 BB77, 2011 YV15, 2011 EB12, 2008 JZ30, 2002 RD27, 68063, 53319, 32906, 275558, 162038, 138205, 9400, 5653, 4503, 4183, 4055, 3200, 2062
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2012-D64, 2012-D65, 2012-D67, 2012-D72 & 2012-D73 -- 2012 DS30, 2012 DR30, 2012 DP30, 2012 DL31, 2012 DK31
106Crni Vrh Obs. in Slovenia, 2 in MPECs 2012-D66 & 2012-D68 -- 2012 DW30, 2012 DE31
448Desert Moon Obs. in New Mexico, 8 in MPECs 2012-D63, 2012-D65 & 2012-D74 -- 2012 DS30, 2012 DN31, 2007 UR3, 90147, 68267, 32906, 162980, 433
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 3 in MPECs 2012-D67, 2012-D72 & 2012-D74 -- 2012 DR30, 2012 DN31, 2012 DK31
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2012-D72 -- 2012 DK31
595Farra d'Isonzo Obs. in Italy, 6 in MPECs 2012-D64, 2012-D65, 2012-D66, 2012-D68, 2012-D72 & 2012-D74 -- 2012 DW30, 2012 DS30, 2012 DP30, 2012 DN31, 2012 DK31, 2012 DE31
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2012-D67 -- 2012 DR30
157Frasso Sabino Obs. in Italy, 1 in MPEC 2012-D67 -- 2012 DR30
C73Galati Obs. in Romania, 3 in MPEC 2012-D63 -- 2009 AV, 209924, 9400
203GiaGa Obs. in Italy, 2 in MPECs 2012-D62 & 2012-D66 -- 2012 DW30, 2012 DC28
651Grasslands Obs. in Arizona, 3 in MPECs 2012-D65, 2012-D73 & 2012-D74 -- 2012 DS30, 2012 DN31, 2012 DL31
J95Great Shefford Obs. in England, 6 in MPECs 2012-D62, 2012-D63, 2012-D65, 2012-D70, 2012-D72 & 2012-D74 -- 2012 DX13, 2012 DS30, 2012 DN31, 2012 DK31, 2012 DG31, 2012 DC28
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-D63 -- 175706
E19Kingsgrove Obs. in New South Wales, 1 in MPEC 2012-D63 -- 162421
704LINEAR in New Mexico, 16 in MPECs 2012-D63, 2012-D65, 2012-D72 & 2012-D74 -- 2012 DS30, 2012 DN31, 2012 DK31, 2012 BN11, 2011 YV15, 2006 VY13, 32906, 312942, 310402, 276049, 189008, 163000, 152667, 138205, 6050, 3554
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2012-D63 -- 2009 WG54
J75La Sagra Obs. in Spain, 1 in MPEC 2012-D63 -- 2012 DA14
130Lumezzane Obs. in Italy, 11 in MPEC 2012-D63 -- 2012 CD29, 2012 BT23, 2012 BJ134, 2012 BC124, 2006 CJ, 2006 AL8, 85990, 85839, 38086, 311554, 152941
H01Magdalena Ridge Obs. (MRO) in New Mexico, 11 in MPECs 2012-D62, 2012-D63, 2012-D65, 2012-D66, 2012-D68, 2012-D69, 2012-D70, 2012-D71, 2012-D72, 2012-D73 & 2012-D74 -- 2012 DW30, 2012 DS30, 2012 DN31, 2012 DL31, 2012 DK31, 2012 DJ31, 2012 DG31, 2012 DF31, 2012 DE31, 2012 DC28, 101955
B90Malina River Obs. in Italy, 2 in MPECs 2012-D68 & 2012-D74 -- 2012 DN31, 2012 DE31
B28Mandi Obs. in Italy, 2 in MPECs 2012-D72 & 2012-D74 -- 2012 DN31, 2012 DK31
118Modra Obs. in Slovakia, 3 in MPECs 2012-D68, 2012-D72 & 2012-D74 -- 2012 DN31, 2012 DK31, 2012 DE31
A99Monte Baldo Obs. in Italy, 1 in MPEC 2012-D74 -- 2012 DN31
474Mt. John Obs. in New Zealand, 1 in MPEC 2012-D72 -- 2012 DK31
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2012-D62, 2012-D63, 2012-D67 & 2012-D69 -- 2012 DR30, 2012 DF31, 2012 DC28, 2004 QB17, 90403, 68063, 31346, 189008, 152560, 719
I89Nerpio Obs. in Italy, 1 in MPEC 2012-D72 -- 2012 DK31
A24New Millennium Obs. in Italy, 4 in MPECs 2012-D62, 2012-D66, 2012-D68 & 2012-D74 -- 2012 DW30, 2012 DN31, 2012 DE31, 2012 DC28
J69North Obs. in England, 2 in MPECs 2012-D63 & 2012-D74 -- 2012 DN31, 2012 CD29
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2012-D71 & 2012-D73 -- 2012 DL31, 2012 DJ31
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2012-D63 -- 2012 BT23, 2011 XO3, 2011 WV134, 162186, 1620
H06*Rolando Ligustri in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-D67 -- 2012 DR30
H06.Cristovao Jacques in Brazil via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-D62 -- 2012 DC28
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-D67 -- 2012 DR30
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-D63 -- 2012 BM86
854Sabino Canyon Obs. in Arizona, 5 in MPECs 2012-D62, 2012-D66, 2012-D67, 2012-D68 & 2012-D72 -- 2012 DW30, 2012 DR30, 2012 DK31, 2012 DE31, 2012 DC28
H36Sandlot Obs. in Kansas, 2 in MPECs 2012-D70 & 2012-D73 -- 2012 DL31, 2012 DG31
204Schiaparelli Obs. in Italy, 29 in MPECs 2012-D62, 2012-D63, 2012-D65, 2012-D66, 2012-D67, 2012-D68, 2012-D69, 2012-D71, 2012-D72, 2012-D73 & 2012-D74 -- 2012 DW30, 2012 DS30, 2012 DR30, 2012 DN31, 2012 DL31, 2012 DK31, 2012 DJ31, 2012 DF31, 2012 DE31, 2012 DC28, 2012 DA14, 2012 CT, 2012 CD29, 2012 CA21, 2012 BJ134, 2012 BC20, 2012 BC124, 2012 BB124, 2012 AT22, 2011 FC29, 2009 AM15, 2008 AN33, 2006 CJ, 2005 AH14, 2003 EO16, 2002 QC7, 2002 EM6, 2002 DJ5, 2000 DO1
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2012-D67 & 2012-D72 -- 2012 DR30, 2012 DK31
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2012-D63 -- 2003 NO4, 212359, 141531, 136618, 3551
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2012-D63, 2012-D64, 2012-D66, 2012-D68, 2012-D69, 2012-D71 & 2012-D73 -- 2012 DW30, 2012 DP30, 2012 DL31, 2012 DJ31, 2012 DF31, 2012 DE31, 2012 CR36, 2012 CP36, 2012 BJ86, 2011 XM1
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-D74 -- 2012 DN31
A78Stia Obs. in Italy, 3 in MPEC 2012-D63 -- 2012 CD29, 2012 BJ134, 32906
B18Terskol Obs. in Russia, 2 in MPECs 2012-D67 & 2012-D72 -- 2012 DR30, 2012 DK31
C92Valdicerro Obs. in Italy, 1 in MPEC 2012-D66 -- 2012 DW30
A48Verona Obs. in Italy, 2 in MPEC 2012-D63 -- 2012 DX13, 2012 BJ134
C44Volta Obs. in Italy, 2 in MPECs 2012-D70 & 2012-D74 -- 2012 DN31, 2012 DG31
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 26 February '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 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 Sentry16382020-2054941.7e-04-3.29-4.050JPL: "Analysis based on 32 observations spanning 3.0758 days (2012-Feb-23.03431 to 2012-Feb-26.110123)." Diameter approximately 0.048 km. from mean, weighted H=24.2.
2012 CA21NEODyS16382073-207313.14e-06-2.61-2.610NEODyS: "Based on 81 optical observations (of which 3 are rejected as outliers) from 2012-02-12.121 to 2012-02-25.112."
2012 BJ86JPL Sentry1638211211.9e-07-5.27-5.270JPL: "Analysis based on 60 observations spanning 27.999 days (2012-Jan-29.10142 to 2012-Feb-26.10046)." Diameter approximately 0.160 km. from mean, weighted H=21.6.
NEODyS16382084-208423.56e-09-6.89-7.150NEODyS: "Based on 52 optical observations (of which 0 are rejected as outliers) from 2012-01-29.102 to 2012-02-26.101."

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 26 February '12

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

0038 2/27Updated Traffic Report
2137Grabbed MPEC 2012-D72 - 2012 DK31 - see above
Grabbed MPEC 2012-D73 - 2012 DL31 - see above
Grabbed MPEC 2012-D74 - 2012 DN31 - see above
2108Grabbed MPEC 2012-D68 - 2012 DE31 - see above
Grabbed MPEC 2012-D69 - 2012 DF31 - see above
Grabbed MPEC 2012-D70 - 2012 DG31 - see above
Grabbed MPEC 2012-D71 - 2012 DJ31 - see above
1903Grabbed MPEC 2012-D64 - 2012 DP30 - see above
Grabbed MPEC 2012-D65 - 2012 DS30 - see above
Grabbed MPEC 2012-D66 - 2012 DW30 - see above
Grabbed MPEC 2012-D67 - 2012 DR30 - see above
1638Noted 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
Grabbed MPEC 2012-D63 - Daily Orbit Update - see above
0331Grabbed MPEC 2012-D62 - 2012 DC28 - see above