A faint comet 9P/Tempel 1 imaged from Stardust 
on 16 & 19 Jan. Credit: NASA/JPL-Caltech.

The Stardust-NExT mission will fly past comet 9P/Tempel 1 tomorrow night, early on the 15th UTC, to get a new look at the crater made by the Deep Impact mission in 2005. Seen here is a NASA composite of the first images of the target (faint fuzzy area just left of center) from the spacecraft on January 16th and 19th. For recent updates on the encounter, see this and this. Credit: NASA/JPL-Caltech.


Contents  on 13 February '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 13 February '11

The MPC's NEO Confirmation Page has 12 listings: 1 new, 11 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and eleven updated listings. Of these, eight were "one nighters." So far The Tracking News has counted a total of 25 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 13 February '11

Minor Planet Electronic Circulars

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


MPEC 2011-C90 - "23:24 UT" - 2011 CM50


MPEC 2011-C89 - "23:18 UT" - 2011 CL50


MPEC 2011-C88 - "22:47 UT" - 2011 CK50


MPEC 2011-C87 - "22:07 UT" - 2011 CJ50


MPEC 2011-C86 - "13:09 UT" - 2011 CH50


MPEC 2011-C85 - "12:48 UT" - 2011 CG50


MPEC 2011-C84 - "12:42 UT" - 2011 CF50


MPEC 2011-C83 - "12:36 UT" - 2011 CE50


MPEC 2011-C82 - "12:31 UT" - 2011 CD50


<< DOU on 13 Feb. '11 >>  MPEC 2011-C81 - "07:10 UT" - Daily Orbit Update


MPEC 2011-C80 - "06:54 UT" - 2011 CB50

Observers  on 13 February '11

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2011-C81, 2011-C85 & 2011-C86 -- 2011 CH50, 2011 CG50, 23183, 174881, 163250, 154555, 137125
G58Chabot Obs. in northern California, 2 in MPECs 2011-C88 & 2011-C90 -- 2011 CM50, 2011 CK50
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPEC 2011-C81 -- 2011 BB19, 2011 AM1, 2010 RK64
I19El Gato Gris Obs. in Argentina, 2 in MPECs 2011-C81 & 2011-C86 -- 2011 CH50, 2009 BH81
E10Faulkes Telescope South in New South Wales, 3 in MPEC 2011-C81 -- 2011 CH33, 2011 BN59, 2011 AN16
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2011-C81 -- 2011 BO59
J28Jaen Obs. in Spain, 1 in MPEC 2011-C81 -- 2011 CG2
704LINEAR in New Mexico, 8 in MPEC 2011-C81 -- 2011 BO59, 2011 AF37, 2001 DQ8, 85990, 253841, 15745, 152889, 7480
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-C80 -- 2011 CB50
A06Mataro Obs. in Spain, 1 in MPEC 2011-C81 -- 3122
G96Mt. Lemmon Survey (MLS) in Arizona, 18 in MPECs 2011-C80, 2011-C81, 2011-C82, 2011-C83, 2011-C84, 2011-C85, 2011-C86, 2011-C87, 2011-C88, 2011-C89 & 2011-C90 -- 2011 CM50, 2011 CL50, 2011 CK50, 2011 CJ50, 2011 CH50, 2011 CG50, 2011 CG33, 2011 CF50, 2011 CE50, 2011 CD50, 2011 CB50, 2011 AM24, 2003 GY, 85275, 33342, 19764, 15745, 138205
A24New Millennium Obs. in Italy, 22 in MPEC 2011-C81 -- 2011 BV10, 2011 AF37, 2009 DV42, 2005 GW119, 2001 DQ8, 2000 CR101, 96590, 85275, 48603, 36284, 23183, 21374, 18882, 175706, 152889, 152563, 137084, 111253, 5496, 4954, 3122, 1864
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2011-C85 -- 2011 CG50
H36Sandlot Obs. in Kansas, 3 in MPECs 2011-C83, 2011-C85 & 2011-C89 -- 2011 CL50, 2011 CG50, 2011 CE50
291Spacewatch 1.8m telescope in Arizona, 16 in MPECs 2011-C81, 2011-C85 & 2011-C87 -- 2011 CS4, 2011 CP4, 2011 CN2, 2011 CJ50, 2011 CG50, 2011 BO40, 2011 BM45, 2011 BM24, 2011 BL45, 2011 BG40, 2011 BA45, 2011 AL5, 2011 AG5, 2010 WE9, 2010 UF7, 2000 CO101
I28Starhoo Obs. in Massachusetts, 2 in MPEC 2011-C81 -- 2002 TD60, 36284
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 February '11

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 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 CJ50JPL Sentry23592029-209378.0e-08-4.35-4.700JPL: "Analysis based on 19 observations spanning 2.0509 days (2011-Feb-11.49804 to 2011-Feb-13.54896)." Diameter approximately 0.340 km. from mean, weighted H=20.0.
2011 CB50JPL Sentry17052041-209632.4e-08-5.28-5.290JPL: "Analysis based on 15 observations spanning 2.0645 days (2011-Feb-10.48858 to 2011-Feb-12.55311)." Diameter approximately 0.258 km. from mean, weighted H=20.6.
NEODyS17052041-204111.9e-08-5.43-5.430NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2011-02-10.489 to 2011-02-12.554."
2011 CY46NEODyS17052069-206914.3e-10-6.81-6.810NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2011-02-11.316 to 2011-02-12.391."
2011 CW46NEODyS17052021-2090458.6e-07-5.49-5.880NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2011-02-11.241 to 2011-02-12.339."
2011 CU46NEODyS17052020-20903111.57e-05-4.95-5.630NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2011-02-11.176 to 2011-02-12.300."
2011 CN2NEODyS1705R E M O V E D-
2011 BM45NEODyS17052071-208674.22e-05-2.44-2.461NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2011-01-30.403 to 2011-02-13.276."
2011 BL45JPL Sentry17052050-2105573.2e-04-4.92-5.160JPL: "Analysis based on 22 observations spanning 12.856 days (2011-Jan-30.34391 to 2011-Feb-12.19974)." Diameter approximately 0.013 km. from mean, weighted H=27.2.
NEODyS17052050-2090262.26e-04-4.92-5.090NEODyS: "Based on 23 optical observations (of which 1 are rejected as outliers) from 2011-01-30.345 to 2011-02-12.201."
2011 AG5NEODyS17052031-2058152.09e-04-2.14-2.31NEODyS: "Based on 105 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-02-13.199."

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 13 February '11

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

2359Noted that JPL Sentry has posted 2011 CJ50 as an impact risk - see above
2329Grabbed MPEC 2011-C89 - 2011 CL50 - see above
Grabbed MPEC 2011-C90 - 2011 CM50 - see above
2300Grabbed MPEC 2011-C87 - 2011 CJ50 - see above
Grabbed MPEC 2011-C88 - 2011 CK50 - see above
1705Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BL45 risk assessment - see above
Noted that NEODyS has updated its 2011 BL45 risk assessment - see above
Noted that NEODyS has updated its 2011 BM45 risk assessment - see above
Noted that JPL Sentry has posted 2011 CB50 as an impact risk - see above
Noted that NEODyS has posted 2011 CB50 as an impact risk - see above
Noted that NEODyS has removed 2011 CN2 as an impact risk - see above
Noted that NEODyS has posted 2011 CU46 as an impact risk - see above
Noted that NEODyS has posted 2011 CW46 as an impact risk - see above
Noted that NEODyS has posted 2011 CY46 as an impact risk - see above
Grabbed MPEC 2011-C81 - Daily Orbit Update - see above
Grabbed MPEC 2011-C82 - 2011 CD50 - see above
Grabbed MPEC 2011-C83 - 2011 CE50 - see above
Grabbed MPEC 2011-C84 - 2011 CF50 - see above
Grabbed MPEC 2011-C85 - 2011 CG50 - see above
Grabbed MPEC 2011-C86 - 2011 CH50 - see above
0702Grabbed MPEC 2011-C80 - 2011 CB50 - see above