Unnamed elongated Mars impact crater. 
Credit: ESA/DLR/FU Berlin (G. Neukum).

Not all impact craters are round. ESA published images yesterday from the Mars Express orbiter showing one of two unnamed elongated craters located south of Huygens Crater on Mars, explaining that it may have been formed by adjacent impacts from two or three pieces of a fractured object. This is a perspective view, credit ESA/DLR/FU Berlin (G. Neukum).


Contents  on 5 March '11

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.

NEOCP Activity  on 5 March '11

The MPC's NEO Confirmation Page has 4 listings: 1 new, 3 updated

When last checked at 2311 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and three updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of nine listings on the NEOCP today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 5 March '11

Minor Planet Electronic Circulars

As of last check at 2311 UTC, there have been nine MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-E32 - "21:16 UT" - 2011 ED12


MPEC 2011-E31 - "20:25 UT" - 2011 EC12


MPEC 2011-E30 - "20:07 UT" - 2011 EB12


MPEC 2011-E29 - "12:45 UT" - 2011 EY11


<< DOU on 5 Mar. '11 >>  MPEC 2011-E28 - "07:08 UT" - Daily Orbit Update


MPEC 2011-E27 - "00:21 UT" - 2011 EO11


MPEC 2011-E26 - "00:17 UT" - 2011 EN11


MPEC 2011-E25 - "00:12 UT" - 2011 EM11


MPEC 2011-E24 - "00:07 UT" - 2011 EL11

Observers  on 5 March '11

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
A50Andrushivka Obs. in the Ukraine, 1 in MPEC 2011-E28 -- 22771
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPEC 2011-E28 -- 2011 EK, 2011 CY46
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-E28 -- 2011 DS9
300Bisei Spaceguard Center in Japan, 6 in MPECs 2011-E28, 2011-E30, 2011-E31 & 2011-E32 -- 2011 EO11, 2011 EN11, 2011 EM11, 2011 ED12, 2011 EC12, 2011 EB12
703Catalina Sky Survey (CSS) in Arizona, 19 in MPECs 2011-E26, 2011-E27, 2011-E28, 2011-E29, 2011-E30, 2011-E31 & 2011-E32 -- 2011 EY11, 2011 ET4, 2011 EO11, 2011 EN11, 2011 ED12, 2011 EC12, 2011 EB12, 2011 CG2, 2011 BO59, 2008 EZ5, 2005 EY169, 99935, 85275, 48603, 251346, 22771, 204232, 164222, 3554
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2011-E27, 2011-E28 & 2011-E32 -- 2011 EO11, 2011 EM11, 2011 ED12
J95Great Shefford Obs. in England, 5 in MPECs 2011-E24, 2011-E25 & 2011-E28 -- 2011 ES4, 2011 EO11, 2011 EN11, 2011 EM11, 2011 EL11
A17Guidestar Obs. in Germany, 7 in MPECs 2011-E25, 2011-E26 & 2011-E28 -- 2011 ET4, 2011 EN11, 2011 EM11, 2011 EK, 2011 DV, 2011 DS9, 2009 AV
355Hadano Obs. in Japan, 1 in MPEC 2011-E32 -- 2011 ED12
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2011-E28 -- 2011 CH71, 1999 TK12
704LINEAR in New Mexico, 1 in MPEC 2011-E28 -- 152671
H01Magdalena Ridge Obs. (MRO) in New Mexico, 17 in MPECs 2011-E24, 2011-E25, 2011-E26, 2011-E27, 2011-E28, 2011-E29, 2011-E30, 2011-E31 & 2011-E32 -- 2011 EY11, 2011 ES4, 2011 EO11, 2011 EN11, 2011 EM11, 2011 EL11, 2011 ED12, 2011 EC12, 2011 EC, 2011 EB7, 2011 EB12, 2011 EB, 2011 DV, 2011 DU9, 2011 DS9, 2011 DS, 2010 QE2
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2011-E28 -- 2011 BP40, 2011 BO40
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2011-E28 -- 2007 MR
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2011-E24, 2011-E25 & 2011-E28 -- 2011 EM11, 2011 EL11, 169675, 4660
A13Naef Obs. in Switzerland, 2 in MPECs 2011-E25 & 2011-E28 -- 2011 EM11, 2004 EM20
586Pic du Midi Obs. in France, 1 in MPEC 2011-E28 -- 99942
H06|H. Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-E28 -- 11885
854Sabino Canyon Obs. in Arizona, 3 in MPECs 2011-E30, 2011-E31 & 2011-E32 -- 2011 ED12, 2011 EC12, 2011 EB12
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-E28 -- 2004 FG1
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2011-E28 -- 2011 CY6, 2011 CG2
291Spacewatch 1.8m telescope in Arizona, 13 in MPEC 2011-E28 -- 2011 EW4, 2011 ES4, 2011 EB, 2011 DV, 2011 DU9, 2011 DU, 2011 DS9, 2011 DS, 2011 CQ4, 2011 CM50, 2011 BN59, 2006 DP14, 2004 XN50
I93St. Pardon de Conques Obs. in France, 2 in MPEC 2011-E28 -- 2011 EM11, 2010 WE9
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2011-E28 -- 137170
G56Walnut Creek Obs. in northern California, 1 in MPEC 2011-E28 -- 2011 EX4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 March '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2311 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 CLOMON (backup) 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
2011 EL11NEODyS20062012-20851637.79e-08-3.81-4.610NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2011-03-04.305 to 2011-03-04.957."
JPL Sentry02562013-21104277.2e-07-3.21-3.730JPL: "Analysis based on 14 observations spanning .65206 days (2011-Mar-04.30394 to 2011-Mar-04.956)." Diameter approximately 0.342 km. from mean, weighted H=20.0.
2011 EC7NEODyS18342015-2083508.78e-09-5.69-6.430NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2011-03-03.224 to 2011-03-04.333."
2011 EW4NEODyS18342048-2089396.51e-09-7.36-8.090NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2011-03-02.324 to 2011-03-05.234."
JPL Sentry18332047-2108606.5e-08-6.41-7.210JPL: "Analysis based on 24 observations spanning 2.9107 days (2011-Mar-02.32289 to 2011-Mar-05.23361)." Diameter approximately 0.085 km. from mean, weighted H=23.0.
2011 ES4NEODyS18342031-2090567.78e-05-4.60-4.70NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2011-03-02.199 to 2011-03-05.255."
JPL Sentry18332031-2109719.1e-05-4.54-4.680JPL: "Analysis based on 42 observations spanning 3.0553 days (2011-Mar-02.19847 to 2011-Mar-05.25376)." Diameter approximately 0.025 km. from mean, weighted H=25.6.
2011 EBNEODyS18342070-209042.7e-05-5.63-5.720NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2011-03-01.381 to 2011-03-04.499."
JPL Sentry18332070-207732.6e-05-5.66-5.700JPL: "Analysis based on 28 observations spanning 3.1182 days (2011-Mar-01.38036 to 2011-Mar-04.49856)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
2011 DU9JPL Sentry18332030-205951.9e-04-4.44-4.450JPL: "Analysis based on 47 observations spanning 5.4524 days (2011-Feb-27.01686 to 2011-Mar-04.46925)." Diameter approximately 0.016 km. from mean, weighted H=26.6.
NEODyS18332043-207271.84e-04-4.45-4.460NEODyS: "Based on 47 optical observations (of which 0 are rejected as outliers) from 2011-02-27.018 to 2011-03-04.470."
2011 DS9JPL Sentry18332056-209261.9e-08-5.57-6.020JPL: "Analysis based on 86 observations spanning 7.3001 days (2011-Feb-25.92799 to 2011-Mar-05.22811)." Diameter approximately 0.311 km. from mean, weighted H=20.2.
NEODyS18332056-208891.97e-08-5.54-5.970NEODyS: "Based on 86 optical observations (of which 0 are rejected as outliers) from 2011-02-25.929 to 2011-03-05.229."
2011 DVNEODyS18342063-209052.84e-06-3.68-3.90NEODyS: "Based on 40 optical observations (of which 0 are rejected as outliers) from 2011-02-22.517 to 2011-03-05.172."
JPL Sentry18332063-2110348.3e-06-3.29-3.840JPL: "Analysis based on 40 observations spanning 10.655 days (2011-Feb-22.51614 to 2011-Mar-05.17092)." Diameter approximately 0.270 km. from mean, weighted H=20.5.
2011 DSJPL Sentry18332065-2109181.6e-05-6.12-6.380JPL: "Analysis based on 61 observations spanning 9.8019 days (2011-Feb-23.39905 to 2011-Mar-05.20094)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
NEODyS18332074-2083101.27e-05-6.19-6.370NEODyS: "Based on 61 optical observations (of which 0 are rejected as outliers) from 2011-02-23.400 to 2011-03-05.202."
2011 BP40JPL Sentry18332016-2109414.3e-07-6.17-6.280JPL: "Analysis based on 9 observations spanning 3.0757 days (2011-Jan-30.40349 to 2011-Feb-02.479228)." Diameter approximately 0.029 km. from mean, weighted H=25.4.
NEODyS18332016-2087185.09e-07-5.65-5.660NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2011-01-30.404 to 2011-02-02.480."

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 5 March '11

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

2135Grabbed MPEC 2011-E32 - 2011 ED12 - see above
2104Grabbed MPEC 2011-E30 - 2011 EB12 - see above
Grabbed MPEC 2011-E31 - 2011 EC12 - see above
2005Noted that NEODyS has posted 2011 EL11 as an impact risk - see above
1834Noted that NEODyS has updated its 2011 DV risk assessment - see above
Noted that NEODyS has updated its 2011 EB risk assessment - see above
Noted that NEODyS has updated its 2011 ES4 risk assessment - see above
Noted that NEODyS has updated its 2011 EW4 risk assessment - see above
1833Noted that JPL Sentry has updated its 2011 BP40 risk assessment - see above
Noted that NEODyS has updated its 2011 BP40 risk assessment - see above
Noted that JPL Sentry has updated its 2011 DS risk assessment - see above
Noted that NEODyS has updated its 2011 DS risk assessment - see above
Noted that JPL Sentry has updated its 2011 DS9 risk assessment - see above
Noted that NEODyS has updated its 2011 DS9 risk assessment - see above
Noted that JPL Sentry has updated its 2011 DU9 risk assessment - see above
Noted that NEODyS has updated its 2011 DU9 risk assessment - see above
Noted that JPL Sentry has updated its 2011 DV risk assessment - see above
Noted that JPL Sentry has updated its 2011 EB risk assessment - see above
Noted that NEODyS has posted 2011 EC7 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 ES4 risk assessment - see above
Noted that JPL Sentry has updated its 2011 EW4 risk assessment - see above
Grabbed MPEC 2011-E28 - Daily Orbit Update - see above
Grabbed MPEC 2011-E29 - 2011 EY11 - see above
0256Noted that JPL Sentry has posted 2011 EL11 as an impact risk - see above
0024Grabbed MPEC 2011-E24 - 2011 EL11 - see above
Grabbed MPEC 2011-E25 - 2011 EM11 - see above
Grabbed MPEC 2011-E26 - 2011 EN11 - see above
Grabbed MPEC 2011-E27 - 2011 EO11 - see above