Sudbury Structure and Wanapitei crater in Ontario, Canada, 
seen in a side-looking radar imagery courtesy of NASA.

The "giant impact" theory for Earth-Moon formation would have iron-loving (siderophile) metals drawn into the cores of the two bodies rather than remaining in the quantities actually found in their mantles. The Southwest Research Institute reports an explanation: Gold, platinum, etc. "were delivered by massive impactors during the final phase of planet formation over 4.5 billion years ago." Not nearly so old at 1.85 billion years, the huge Sudbury impact structure (the subtle ellipse in this side-looking radar imagery from NASA) has one of the world's largest deposits of nickel, a siderophile, and there are other such possible impact-deposit associations. This all brings attention to the rich potential of space resources. See also a NASA/Ames news item.


Contents  on 11 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 11 December '10

The MPC's NEO Confirmation Page has 12 listings: 5 new, 7 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five new and seven updated listings. Of these, ten were "one nighters." So far The Tracking News has counted a total of 25 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 11 December '10

Minor Planet Electronic Circulars

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


MPEC 2010-X94 - "17:32 UT" - 2010 EP65


MPEC 2010-X93 - "16:45 UT" - 2010 XK52


MPEC 2010-X92 - "16:41 UT" - 2010 XJ52


<< DOU on 11 Dec. '10 >>  MPEC 2010-X91 - "07:08 UT" - Daily Orbit Update


MPEC 2010-X90 - "02:27 UT" - 2010 XU45


MPEC 2010-X89 - "02:23 UT" - 2010 XT45


MPEC 2010-X88 - "00:23 UT" - 2010 XS45

Observers  on 11 December '10

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 39 in MPEC 2010-X91 -- 2010 XY, 2010 XX, 2010 XV, 2010 XU, 2010 XT10, 2010 XS10, 2010 XR, 2010 XO10, 2010 XK3, 2010 XJ3, 2010 XJ, 2010 XH3, 2010 XG11, 2010 XF3, 2010 XF11, 2010 XE11, 2010 XE, 2010 XC15, 2010 XB24, 2010 XA25, 2010 XA11, 2010 XA, 2010 WR7, 2010 WL, 2010 WJ, 2010 WH, 2010 WG3, 2010 WB9, 2010 VQ98, 2010 VF139, 2010 UT7, 2010 RJ4, 2010 PS65, 2010 PM9, 2010 MN51, 2010 LF86, 2010 KK127, 2010 JM151, 3122
300Bisei Spaceguard Center in Japan, 3 in MPECs 2010-X89, 2010-X90 & 2010-X93 -- 2010 XU45, 2010 XT45, 2010 XK52
160Castelmartini Obs. in Italy, 2 in MPEC 2010-X91 -- 2010 SD13, 2010 JL33
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2010-X90, 2010-X91 & 2010-X93 -- 2010 XU45, 2010 XK52, 2010 XG11, 2010 XE25, 2010 WR7, 2010 WP8, 2010 TC47, 2005 GC120, 96590, 189011, 5869, 4688
448Desert Moon Obs. in New Mexico, 1 in MPEC 2010-X91 -- 2010 XG11
H20Eastern Illinois Univ. Obs. in Illinois, 2 in MPEC 2010-X91 -- 2006 VB14, 1999 XM141
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2010-X91 -- 2010 WV8
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2010-X91 -- 2010 XT45
203GiaGa Obs. in Italy, 6 in MPEC 2010-X91 -- 2010 XG3, 2010 XF3, 2010 WP8, 2010 WL, 2010 WJ, 2006 VB14
379Hamamatsu-Yuto Obs. in Japan, 7 in MPEC 2010-X91 -- 2010 WL, 2010 RF181, 2010 LR68, 2010 LF86, 2006 VB14, 2005 GC120, 2000 AC6
951Highworth Obs. in England, 1 in MPEC 2010-X91 -- 2010 WP8
G92Jarnac Obs. in Arizona, 1 in MPEC 2010-X91 -- 12923
695]Mark Trueblood via Kitt Peak Natl. Obs. (KPNO) in Arizona, 13 in MPECs 2010-X90 & 2010-X91 -- 2010 XU45, 2010 XU, 2010 XG, 2010 WG3, 2010 WC9, 2010 VQ21, 2010 VC40, 2010 UM, 2010 KR10, 2010 JV34, 2009 CN5, 2007 XY9, 2005 GC120
704LINEAR in New Mexico, 15 in MPECs 2010-X88, 2010-X89, 2010-X91 & 2010-X93 -- 2010 XT45, 2010 XS45, 2010 XK52, 2010 WQ7, 2010 WB9, 2010 WA9, 2010 TC47, 2001 XF1, 242211, 170903, 153842, 137062, 4688, 3838, 3288
844Los Molinos Obs. in Uruguay, 1 in MPEC 2010-X91 -- 2000 AC6
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2010-X90, 2010-X91 & 2010-X93 -- 2010 XU45, 2010 XK52, 2010 XD25, 2010 XC25
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2010-X91 -- 2010 MU111, 2010 JM151
G96Mt. Lemmon Survey (MLS) in Arizona, 20 in MPECs 2010-X88, 2010-X90, 2010-X91 & 2010-X92 -- 2010 XX, 2010 XU45, 2010 XS45, 2010 XJ52, 2010 XH3, 2010 XD11, 2010 XA24, 2010 WV8, 2010 VY190, 2010 OC101, 2010 LR68, 2006 WP127, 2000 QN130, 2000 JQ66, 2000 JO78, 1990 SM, 153842, 153591, 138893, 138859
J93Mt. Tuffley Obs. in England, 3 in MPEC 2010-X91 -- 2006 VB14, 2005 GC120, 3838
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2010-X94 -- 2010 EP65
A13Naef Obs. in Switzerland, 1 in MPEC 2010-X91 -- 5496
A24New Millennium Obs. in Italy, 1 in MPEC 2010-X89 -- 2010 XT45
A53Peschiera del Garda Obs. in Italy, 5 in MPEC 2010-X91 -- 2010 WJ, 2010 LF86, 2006 VB14, 2005 GC120, 2000 AC6
473Remanzacco Obs. in Italy, 2 in MPECs 2010-X90 & 2010-X93 -- 2010 XU45, 2010 XK52
204Schiaparelli Obs. in Italy, 2 in MPECs 2010-X89 & 2010-X93 -- 2010 XT45, 2010 XK52
2604Andrew Lowe in Alberta using the Siding Spring Digitized Sky Survey in New South Wales, 1 in MPEC 2010-X94 -- 2010 EP65
587Sormano Obs. in Italy, 2 in MPEC 2010-X91 -- 2010 XA25, 2010 WA9
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2010-X91 -- 2009 KD5, 40267, 144411
291Spacewatch 1.8m telescope in Arizona, 18 in MPECs 2010-X91 & 2010-X92 -- 2010 XU, 2010 XR10, 2010 XM, 2010 XJ52, 2010 XJ11, 2010 XH11, 2010 XD25, 2010 XC25, 2010 XC15, 2010 XC11, 2010 XB24, 2010 XA, 2006 JZ25, 2006 CV, 2003 LG, 2000 CO101, 2000 AZ93, 250680
C51WISE in Earth polar orbit, 4 in MPEC 2010-X91 -- 2010 NW117, 2006 OG15, 2004 BL11, 2002 OS4
I15Wishing Star Obs. in Rhode Island, 5 in MPEC 2010-X91 -- 2010 WQ7, 2010 TC47, 2010 JL33, 141498, 138852
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 XD25NEODyS1654R E M O V E D-
JPL Sentry1654R E M O V E DJPL: Risk listing removed at 1206 UTC.
2010 XC25JPL Sentry16542021-21091381.3e-05-2.38-3.080JPL: "Analysis based on 25 observations spanning 2.1669 days (2010-Dec-08.37716 to 2010-Dec-10.54411)." Diameter approximately 0.272 km. from mean, weighted H=20.5.
NEODyS16542021-2090769.8e-06-2.49-3.110NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2010-12-08.378 to 2010-12-10.545."
2010 XUJPL Sentry16542071-209238.9e-09-8.49-8.570JPL: "Analysis based on 58 observations spanning 9.2744 days (2010-Dec-01.09924 to 2010-Dec-10.37367)." Diameter approximately 0.029 km. from mean, weighted H=25.4.
NEODyS16542059-208447.83e-09-8.57-8.770NEODyS: "Based on 58 optical observations (of which 0 are rejected as outliers) from 2010-12-01.100 to 2010-12-10.374."
2010 XRJPL Sentry1654201313.5e-10-8.86-8.860JPL: "Analysis based on 17 observations spanning 5.9133 days (2010-Dec-02.35142 to 2010-Dec-08.26474)." Diameter approximately 0.015 km. from mean, weighted H=26.8.
NEODyS16542013-201311.7e-06-5.15-5.150NEODyS: "Based on 17 optical observations (of which 2 are rejected as outliers) from 2010-12-02.352 to 2010-12-08.266."
2010 WC9JPL Sentry16542027-2109184.2e-06-4.25-4.310JPL: "Analysis based on 30 observations spanning 10.033 days (2010-Nov-30.08059 to 2010-Dec-10.11346)." Diameter approximately 0.071 km. from mean, weighted H=23.4.
NEODyS16542027-2089213.92e-06-4.28-4.330NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2010-11-30.081 to 2010-12-10.114."
2010 WA9JPL Sentry1654R E M O V E DJPL: Risk listing removed at 1124 UTC.
2010 VQ98JPL Sentry1654R E M O V E DJPL: Risk listing removed at 1108 UTC.
2007 VF189JPL Sentry1654207718.1e-09-9.84-9.840JPL: "Analysis based on 24 observations spanning 1.5595 days (2007-Nov-12.27947 to 2007-Nov-13.83895)." Diameter approximately 0.007 km. from mean, weighted H=28.4.

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 11 December '10

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

1804Grabbed MPEC 2010-X93 - 2010 XK52 - see above
Grabbed MPEC 2010-X94 - 2010 EP65 - see above
1654Noted that JPL Sentry has posted 2007 VF189 as an impact risk - see above
Noted that JPL Sentry has removed 2010 VQ98 as an impact risk - see above
Noted that JPL Sentry has removed 2010 WA9 as an impact risk - see above
Noted 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 removed 2010 XD25 as an impact risk - see above
Noted that NEODyS has removed 2010 XD25 as an impact risk - see above
Noted that JPL Sentry has updated its 2010 XR risk assessment - see above
Noted that NEODyS has updated its 2010 XR risk assessment - 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-X91 - Daily Orbit Update - see above
Grabbed MPEC 2010-X92 - 2010 XJ52 - see above
0244Grabbed MPEC 2010-X89 - 2010 XT45 - see above
Grabbed MPEC 2010-X90 - 2010 XU45 - see above
0041Grabbed MPEC 2010-X88 - 2010 XS45 - see above