Sudanese students await the signal to search for 
meteorites from 2008 TC3. Courtesy of NASA/SETI.

In this photo, courtesy of NASA/SETI, a line of Sudanese students awaits the signal to begin a search for remnants of asteroid 2008 TC3. Now NASA/Goddard reports that analysis of what they found, a meteorite from the Almahata Sitta strewn field, "suggests that there is more than one way to make amino acids in space [something] involving reactions in gases as a very hot asteroid cools down" after severe impact with another minor object.

Contents  on 19 December '10


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 19 December '10

The MPC's NEO Confirmation Page has 2 listings: 1 new, 1 updated

When last checked at 2337 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and one updated listing. Of these, one was a "one nighter." So far The Tracking News has counted a total of seven listings on the NEOCP at some point 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 19 December '10

Minor Planet Electronic Circulars

As of last check at 2337 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 19 Dec. '10 >>  MPEC 2010-Y18 - "07:08 UT" - Daily Orbit Update

MPEC 2010-Y17 - "06:10 UT" - 2010 XB73

MPEC 2010-Y16 - "05:37 UT" - 2010 XA73

MPEC 2010-Y15 - "05:32 UT" - 2010 XZ72

MPEC 2010-Y14 - "05:27 UT" - 2010 XY72

MPEC 2010-Y13 - "05:04 UT" - 2010 XX72

Observers  on 19 December '10

Eleven observers appear in today's MPECs.

CodeObserver / observatory
160Castelmartini Obs. in Italy, 3 in MPECs 2010-Y13 & 2010-Y18 -- 2010 XZ58, 2010 XX72, 2010 XM56
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2010-Y18 -- 2010 XZ67, 2010 XC25
F65%T. Lister via Faulkes Telescope North in Hawaii, 1 in MPEC 2010-Y15 -- 2010 XZ72
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2010-Y17 -- 2010 XB73
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2010-Y15 & 2010-Y16 -- 2010 XZ72, 2010 XA73
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2010-Y13, 2010-Y14, 2010-Y17 & 2010-Y18 -- 2010 XY72, 2010 XX72, 2010 XR45, 2010 XB73
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2010-Y15 & 2010-Y16 -- 2010 XZ72, 2010 XA73
204Schiaparelli Obs. in Italy, 1 in MPEC 2010-Y14 -- 2010 XY72
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2010-Y18 -- 2010 XJ
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2010-Y17 -- 2010 XB73
C51WISE in Earth polar orbit, 9 in MPEC 2010-Y18 -- 2010 TH19, 2010 NW117, 2010 LZ63, 2010 LM68, 2004 TR12, 2000 AZ93, 144901, 4957, 4954
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 December '10

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2337 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.





Notes for Today's Latest Risk Assessments
2010 XB73JPL Sentry17002016-2109531.3e-07-5.51-6.200JPL: "Analysis based on 19 observations spanning 1.0860 days (2010-Dec-14.13028 to 2010-Dec-15.2163)." Diameter approximately 0.110 km. from mean, weighted H=22.5.
NEODyS17002017-206792.1e-08-6.31-7.00NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2010-12-14.131 to 2010-12-15.217."
2010 XA73NEODyS17002013-201311.2e-10-5.32-5.320NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2010-12-15.541 to 2010-12-16.622."
JPL Sentry0726201311.3e-10-5.55-5.550JPL: "Analysis based on 12 observations spanning 1.0802 days (2010-Dec-15.54058 to 2010-Dec-16.620738)." Diameter approximately 0.580 km. from mean, weighted H=18.8.
2010 XC25JPL Sentry17002024-2093302.3e-05-2.42-2.920JPL: "Analysis based on 47 observations spanning 6.9164 days (2010-Dec-08.37716 to 2010-Dec-15.29353)." Diameter approximately 0.259 km. from mean, weighted H=20.6.
NEODyS17002039-2090322.27e-05-2.43-2.940NEODyS: "Based on 47 optical observations (of which 0 are rejected as outliers) from 2010-12-08.378 to 2010-12-15.294."

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 19 December '10

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

1700Noted that NEODyS has posted 2010 XA73 as an impact risk - see above
Noted that JPL Sentry has posted 2010 XB73 as an impact risk - see above
Noted that NEODyS has posted 2010 XB73 as an impact risk - see above
Noted that JPL Sentry has updated its 2010 XC25 risk assessment - see above
Noted that NEODyS has updated its 2010 XC25 risk assessment - see above
Grabbed MPEC 2010-Y18 - Daily Orbit Update - see above
0726Noted that JPL Sentry has posted 2010 XA73 as an impact risk - see above
Grabbed MPEC 2010-Y14 - 2010 XY72 - see above
Grabbed MPEC 2010-Y15 - 2010 XZ72 - see above
Grabbed MPEC 2010-Y16 - 2010 XA73 - see above
Grabbed MPEC 2010-Y17 - 2010 XB73 - see above
0513Grabbed MPEC 2010-Y13 - 2010 XX72 - see above