3200 Phaethon's 2009 path through STEREO-A's HI-1A coronagraph. 
Credit: NASA, David Jewitt, and Jing Li.

The Geminid meteor shower, which peaks overnight tomorrow, is associated with 3200 Phaethon. This activity might be explained by heating from the rocky object's close approaches to the Sun, and Science@NASA reports that an unexpected brightening was observed in June 2009 when Phaethon was observed at perihelion using STEREO coronagraph imagery (path shown above, credit NASA, Jewitt, and Li). See more info here.


Contents  on 12 December '10

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 12 December '10

The MPC's NEO Confirmation Page has 8 listings: 4 new, 4 updated

When last checked at 2300 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four new and four updated listings. Of these, five were "one nighters." The Tracking News counted a total of sixteen listings on the NEOCP at some point on this day.

New MPECs  on 12 December '10

Minor Planet Electronic Circulars

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


MPEC 2010-X101 - "23:42 UT" - Comet C/2010 X1 (Elenin)


MPEC 2010-X100 - "12:27 UT" - 2010 XP56


MPEC 2010-X99 - "12:08 UT" - 2010 XO56


MPEC 2010-X98 - "12:04 UT" - 2010 XN56


MPEC 2010-X97 - "11:59 UT" - 2010 XM56


MPEC 2010-X96 - "11:51 UT" - 2010 XL56


<< DOU on 12 Dec. '10 >>  MPEC 2010-X95 - "07:09 UT" - Daily Orbit Update

Observers  on 12 December '10

A total of 26 observers appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2010-X95 -- 2010 XY, 2010 XT10, 2010 XO10, 2010 XJ11, 2010 XG3, 2010 XG11, 2010 XE11, 2010 XC11, 2010 WZ8, 2010 WR7, 2010 WL, 2010 WH, 2010 WD9
160Castelmartini Obs. in Italy, 4 in MPEC 2010-X95 -- 2010 XG3, 2010 WP8, 2010 WA9, 2010 LF86
703Catalina Sky Survey (CSS) in Arizona, 10 in MPEC 2010-X95 -- 2010 XT10, 2010 XO10, 2010 VL1, 2007 EM88, 2006 WY2, 2006 VB14, 2004 BW1, 162781, 137052, 6569
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2010-X101 -- C/2010 X1
203GiaGa Obs. in Italy, 3 in MPEC 2010-X95 -- 2010 XJ3, 2010 WQ7, 141498
J95Great Shefford Obs. in England, 2 in MPECs 2010-X95 & 2010-X99 -- 2010 XO56, 2010 XA24
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2010-X101 -- C/2010 X1
704LINEAR in New Mexico, 15 in MPECs 2010-X95, 2010-X97 & 2010-X99 -- 2010 XR45, 2010 XO56, 2010 XM56, 2010 WJ, 2010 VY190, 2010 TC47, 2001 XF1, 2000 AZ93, 249595, 210012, 170086, 153814, 143381, 4688, 3838
560Madonna di Dossobuono Obs. in Italy, 1 in MPEC 2010-X95 -- 2010 JL33
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2010-X96, 2010-X97, 2010-X98, 2010-X99, 2010-X100 & 2010-X101 -- 2010 XP56, 2010 XO56, 2010 XN56, 2010 XM56, 2010 XL56, C/2010 X1
188Majdanak Obs. in Uzbekistan, 1 in MPEC 2010-X101 -- C/2010 X1
B90Malina River Obs. in Italy, 2 in MPECs 2010-X99 & 2010-X101 -- 2010 XO56, C/2010 X1
A06Mataro Obs. in Spain, 1 in MPEC 2010-X95 -- 2006 VB14
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2010-X95 -- 2010 WC9, 2010 VO
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2010-X95, 2010-X96, 2010-X97, 2010-X98 & 2010-X100 -- 2010 XP56, 2010 XN56, 2010 XN, 2010 XM56, 2010 XL56, 2010 XJ11, 2003 SV222, 256670
A13Naef Obs. in Switzerland, 1 in MPEC 2010-X95 -- 53426
A53Peschiera del Garda Obs. in Italy, 5 in MPEC 2010-X95 -- 2010 XO10, 2010 XE11, 2010 LF86, 2010 JL33, 2006 VB14
H06|H. Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2010-X101 -- C/2010 X1
204Schiaparelli Obs. in Italy, 3 in MPECs 2010-X97, 2010-X99 & 2010-X101 -- 2010 XO56, 2010 XM56, C/2010 X1
587Sormano Obs. in Italy, 3 in MPEC 2010-X95 -- 2010 XO10, 2010 XE11, 2010 XA24
291Spacewatch 1.8m telescope in Arizona, 20 in MPECs 2010-X95, 2010-X96 & 2010-X97 -- 2010 XZ, 2010 XU, 2010 XR10, 2010 XN, 2010 XM56, 2010 XM, 2010 XL56, 2010 XJ11, 2010 XG25, 2010 XD25, 2010 XC25, 2010 WZ8, 2010 WU8, 2010 WT8, 2010 WT, 2010 MF1, 2010 KH, 2006 GW2, 2002 BN, 2000 AZ93
I28Starhoo Obs. in Massachusetts, 1 in MPEC 2010-X95 -- 5869
C36Starry Wanderer Obs., 2 in MPEC 2010-X95 -- 2010 JL33, 2006 VB14
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2010-X101 -- C/2010 X1
A48Verona Obs. in Italy, 2 in MPEC 2010-X95 -- 2010 UX6, 2010 JL33
C51WISE in Earth polar orbit, 5 in MPEC 2010-X95 -- 2010 NW117, 2008 AT28, 248590, 23183, 10165
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 December '10

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2300 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
2010 XO56JPL Sentry17272027-2105289.0e-08-4.38-4.580JPL: "Analysis based on 17 observations spanning 1.0032 days (2010-Dec-11.46753 to 2010-Dec-12.47072)." Diameter approximately 0.280 km. from mean, weighted H=20.4.
2010 XC25JPL Sentry17272024-2109672.0e-05-2.16-2.730JPL: "Analysis based on 28 observations spanning 3.0663 days (2010-Dec-08.37716 to 2010-Dec-11.44347)." Diameter approximately 0.269 km. from mean, weighted H=20.5.
NEODyS17272024-2090591.67e-05-2.23-2.760NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2010-12-08.378 to 2010-12-11.444."
2010 XUJPL Sentry17272088-209221.5e-09-9.35-9.520JPL: "Analysis based on 64 observations spanning 10.999 days (2010-Dec-01.09924 to 2010-Dec-12.09809)." Diameter approximately 0.029 km. from mean, weighted H=25.3.
NEODyS17272072-208822.54e-10-10.12-10.150NEODyS: "Based on 64 optical observations (of which 0 are rejected as outliers) from 2010-12-01.100 to 2010-12-12.099."
2010 XNJPL Sentry1727207821.0e-09-8.95-9.200JPL: "Analysis based on 29 observations spanning 10.023 days (2010-Dec-01.30772 to 2010-Dec-11.33026)." Diameter approximately 0.042 km. from mean, weighted H=24.5.
2010 WC9JPL Sentry17272027-2109214.5e-06-4.28-4.350JPL: "Analysis based on 33 observations spanning 10.033 days (2010-Nov-30.08059 to 2010-Dec-10.11346)." Diameter approximately 0.069 km. from mean, weighted H=23.5.
NEODyS17272027-2087213.92e-06-4.30-4.360NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2010-11-30.081 to 2010-12-10.114."

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 12 December '10

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

0101 12/13Grabbed MPEC 2010-X101 - Comet C/2010 X1 (Elenin) - see above
1727Noted that JPL Sentry has updated its 2010 WC9 risk assessment - see above
Noted that NEODyS has updated its 2010 WC9 risk assessment - 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
Noted that JPL Sentry has reposted 2010 XN as an impact risk - see above
Noted that JPL Sentry has posted 2010 XO56 as an impact risk - see above
Noted that JPL Sentry has updated its 2010 XU risk assessment - see above
Noted that NEODyS has updated its 2010 XU risk assessment - see above
Grabbed MPEC 2010-X95 - Daily Orbit Update - see above
Grabbed MPEC 2010-X96 - 2010 XL56 - see above
Grabbed MPEC 2010-X97 - 2010 XM56 - see above
Grabbed MPEC 2010-X98 - 2010 XN56 - see above
Grabbed MPEC 2010-X99 - 2010 XO56 - see above
Grabbed MPEC 2010-X100 - 2010 XP56 - see above