Shocked zircon grain 
Credit: UPR & UW.

An item from NASA last month reports that a "record of an ancient meteorite impact event that is preserved in microstructures in detrital grains of quartz, zircon, and monazite" (sand) has been found near South Africa's Vredefort Dome. This "provides a new method to search for evidence of missing impacts in sedimentary rocks throughout the geologic time scale." Zircon is already an important geochronology tool. Seen here: "Cathodoluminescence (CL) image of the polished interior of a shocked zircon showing three orientations of planar fractures." Credit: The universities of Puerto Rico and Wisconsin.


Contents  on 3 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 3 December '10

The MPC's NEO Confirmation Page has 13 listings: 1 new, 12 updated

When last checked at 2325 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and twelve updated listings. Of these, five were "one nighters." The Tracking News counted a total of 25 listings on the NEOCP at some point on this day.

New MPECs  on 3 December '10

Minor Planet Electronic Circulars

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


MPEC 2010-X42 - "23:40 UT" - PHAs


MPEC 2010-X41 - "23:40 UT" - Unusual Minor Planets


MPEC 2010-X40 - "23:40 UT" - Amors


MPEC 2010-X39 - "23:40 UT" - Atens and Apollos


MPEC 2010-X38 - "23:32 UT" - Observable Comets


MPEC 2010-X37 - "12:44 UT" - 2010 XA1


MPEC 2010-X36 - "12:38 UT" - 2010 XZ


MPEC 2010-X35 - "12:16 UT" - 2002 AQ2


MPEC 2010-X34 - "12:03 UT" - 2010 XY


MPEC 2010-X33 - "11:58 UT" - 2010 XX


MPEC 2010-X32 - "11:52 UT" - 2010 XW


MPEC 2010-X31 - "11:47 UT" - 2010 XV


MPEC 2010-X30 - "11:06 UT" - 2010 XU


<< DOU on 3 Dec. '10 >>  MPEC 2010-X29 - "07:11 UT" - Daily Orbit Update

Observers  on 3 December '10

Sixteen observers appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 22 in MPECs 2010-X29, 2010-X30 & 2010-X31 -- 2010 XV, 2010 XU, 2010 XK, 2010 XJ, 2010 XH, 2010 XG, 2010 XA, 2010 WZ8, 2010 WV8, 2010 WR7, 2010 WL, 2010 WJ, 2010 WG3, 2010 WB9, 2010 VY190, 2010 VW75, 2010 UD8, 2010 TJ167, 2010 SD13, 2010 SA12, 2010 RP80, 2010 LO97
C34Baja Obs. in Hungary, 1 in MPEC 2010-X29 -- 2010 LY63
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2010-X29 -- 2010 SC41, 2010 NW117, 1999 XR35
448Desert Moon Obs. in New Mexico, 7 in MPEC 2010-X29 -- 2010 WR7, 2010 WG3, 2010 WB, 2010 VY190, 2010 OQ1, 2007 EM88, 2007 EJ
H20Eastern Illinois Univ. Obs. in Illinois, 1 in MPEC 2010-X29 -- 2010 WL
J95Great Shefford Obs. in England, 1 in MPEC 2010-X33 -- 2010 XX
704LINEAR in New Mexico, 16 in MPECs 2010-X29 & 2010-X33 -- 2010 XX, 2010 XG, 2010 XE, 2010 SD13, 2010 LF86, 2007 EM88, 2003 MJ4, 1999 XR35, 96590, 68278, 36284, 189011, 138852, 137084, 137032, 5496
H01Magdalena Ridge Obs. (MRO) in New Mexico, 8 in MPECs 2010-X30, 2010-X31, 2010-X32, 2010-X33, 2010-X34, 2010-X35, 2010-X36 & 2010-X37 -- 2010 XZ, 2010 XY, 2010 XX, 2010 XW, 2010 XV, 2010 XU, 2010 XA1, 2002 AQ2
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2010-X29, 2010-X30, 2010-X31, 2010-X32, 2010-X34, 2010-X35, 2010-X36 & 2010-X37 -- 2010 XZ, 2010 XY, 2010 XW, 2010 XV, 2010 XU, 2010 XA1, 2010 XA, 2010 WC3, 2009 KD5, 2002 AQ2
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2010-X29 & 2010-X34 -- 2010 XY, 2010 XG
H36Sandlot Obs. in Kansas, 4 in MPECs 2010-X30, 2010-X31, 2010-X33 & 2010-X34 -- 2010 XY, 2010 XX, 2010 XV, 2010 XU
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2010-X29 -- 2005 QA5
291Spacewatch 1.8m telescope in Arizona, 16 in MPECs 2010-X29, 2010-X30, 2010-X36 & 2010-X37 -- 2010 XZ, 2010 XU, 2010 XA1, 2010 WT, 2010 WD9, 2010 WC1, 2010 VW194, 2010 VJ, 2010 UQ7, 2010 UD8, 2010 SS16, 2010 MF1, 2010 KB61, 2010 HQ80, 2010 GY6, 2002 AY1
6735Jim Young via Table Mtn. Obs. in southern California, 2 in MPECs 2010-X29 & 2010-X31 -- 2010 XV, 2010 VB
H10Tzec Maun Obs. Mayhill in New Mexico, 6 in MPEC 2010-X29 -- 2010 XG, 2010 WV8, 2010 WG3, 2010 SC41, 2006 VB14, 1997 XS2
I15Wishing Star Obs. in Rhode Island, 6 in MPEC 2010-X29 -- 2010 WP8, 2010 VY190, 2010 SD13, 2010 LF86, 2006 VB14, 152978
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 December '10

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
2010 XUJPL Sentry16482040-2109342.2e-07-7.06-7.780JPL: "Analysis based on 32 observations spanning 2.0535 days (2010-Dec-01.09924 to 2010-Dec-03.15275)." Diameter approximately 0.032 km. from mean, weighted H=25.1.
2010 XRNEODyS16492013-2067192.27e-06-5.63-5.750NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2010-12-02.352 to 2010-12-02.445."
JPL Sentry16482012-21092017.1e-06-5.41-5.690JPL #2 for the day: "Analysis based on 12 observations spanning .09315 days (2010-Dec-02.35142 to 2010-Dec-02.44457)." Diameter approximately 0.016 km. from mean, weighted H=26.7.
2010 XQNEODyS16492034-208885.6e-09-8.07-8.30NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2010-12-02.309 to 2010-12-02.436."
JPL Sentry16482033-2105492.7e-07-6.63-7.170JPL #2 for the day: "Analysis based on 15 observations spanning .12618 days (2010-Dec-02.30871 to 2010-Dec-02.43489)." Diameter approximately 0.031 km. from mean, weighted H=25.2.
2010 XPNEODyS16492014-2086324.24e-07-7.34-7.510NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2010-12-02.250 to 2010-12-02.323."
JPL Sentry16482014-21071544.2e-07-6.97-8.020JPL #2 for the day: "Analysis based on 11 observations spanning .07331 days (2010-Dec-02.24919 to 2010-Dec-02.3225)." Diameter approximately 0.015 km. from mean, weighted H=26.8.
2010 XNNEODyS16492068-206813.5e-10-9.35-9.350NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2010-12-01.308 to 2010-12-02.396."
2010 XJJPL Sentry1648R E M O V E DJPL: Risk listing removed at 1128 UTC.
2010 XAJPL Sentry1648R E M O V E DJPL: Risk listing removed at 1129 UTC.
NEODyS1648R E M O V E D-
2010 WD9JPL Sentry1648R E M O V E DJPL: Risk listing removed at 1058 UTC.
2010 WZ8JPL Sentry1648R E M O V E DJPL: Risk listing removed at 1053 UTC.
2010 VW194JPL Sentry23592042-2109274.4e-05-5.37-6.020JPL #2 for the day: "Analysis based on 34 observations spanning 17.104 days (2010-Nov-15.34197 to 2010-Dec-02.44639)." Diameter approximately 0.017 km. from mean, weighted H=26.5.
NEODyS16492047-2089202.66e-05-5.55-5.990NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2010-11-15.343 to 2010-12-02.447."

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 3 December '10

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

2359Noted that JPL Sentry has updated its 2010 VW194 risk assessment - see above
Grabbed MPEC 2010-X38 - Observable Comets - see above
Grabbed MPEC 2010-X39 - Atens and Apollos - see above
Grabbed MPEC 2010-X40 - Amors - see above
Grabbed MPEC 2010-X41 - Unusual Minor Planets - see above
Grabbed MPEC 2010-X42 - PHAs - see above
1649Noted that NEODyS has updated its 2010 VW194 risk assessment - see above
Grabbed MPEC 2010-X29 - Daily Orbit Update - see above
Grabbed MPEC 2010-X30 - 2010 XU - see above
Grabbed MPEC 2010-X31 - 2010 XV - see above
Grabbed MPEC 2010-X32 - 2010 XW - see above
Grabbed MPEC 2010-X33 - 2010 XX - see above
Grabbed MPEC 2010-X34 - 2010 XY - see above
Grabbed MPEC 2010-X35 - 2002 AQ2 - see above
Grabbed MPEC 2010-X36 - 2010 XZ - see above
Grabbed MPEC 2010-X37 - 2010 XA1 - see above
1648Noted that JPL Sentry has updated its 2010 VW194 risk assessment - see above
Noted that JPL Sentry has removed 2010 WD9 as an impact risk - see above
Noted that JPL Sentry has removed 2010 WZ8 as an impact risk - see above
Noted that JPL Sentry has removed 2010 XA as an impact risk - see above
Noted that NEODyS has removed 2010 XA as an impact risk - see above
Noted that JPL Sentry has removed 2010 XJ as an impact risk - see above
Noted that NEODyS has posted 2010 XN as an impact risk - see above
Noted that JPL Sentry has updated its 2010 XP risk assessment - see above
Noted that NEODyS has posted 2010 XP as an impact risk - see above
Noted that JPL Sentry has updated its 2010 XQ risk assessment - see above
Noted that NEODyS has posted 2010 XQ as an impact risk - see above
Noted that JPL Sentry has updated its 2010 XR risk assessment - see above
Noted that NEODyS has posted 2010 XR as an impact risk - see above
Noted that JPL Sentry has posted 2010 XU as an impact risk - see above
0230Noted that JPL Sentry has posted 2010 XP as an impact risk - see above
0201Noted that JPL Sentry has posted 2010 XR as an impact risk - see above
0131Noted that JPL Sentry has posted 2010 XQ as an impact risk - see above