C/SOHO-2000 discovered 26 Dec. 2010 by Marcin Kusiak 
in online SOHO images. Credit: NASA, ESA, and SOHO-Battams.

Turns out that the home stretch to discovering the 2,000th SOHO comet, which is seen here from the 26th of last month, included an "unprecedented" storm of 25 Sun-diving comets during 13-22 December. These were small as comets go, on the order of ten meters in diameter, but are part of a trend that may "herald a much bigger sungrazer to come, something people could see with the naked eye," according to a Science@NASA report this week. Illustration credit: NASA/Goddard, ESA, and SOHO-Battams.


Contents  on 14 January '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 14 January '11

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

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eight updated listings. Of these, seven were "one nighters." So far The Tracking News has counted a total of 20 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 14 January '11

Minor Planet Electronic Circulars

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


MPEC 2011-A66 - "22:07 UT" - 2011 AN37


MPEC 2011-A65 - "20:10 UT" - Comet C/2011 A2 (Scotti)


MPEC 2011-A64 - "17:32 UT" - 2011 AM37


MPEC 2011-A63 - "17:24 UT" - 2011 AL37


MPEC 2011-A62 - "16:56 UT" - 2011 AK37


MPEC 2011-A61 - "16:49 UT" - 2011 AJ37


MPEC 2011-A60 - "12:30 UT" - 2011 AH37


MPEC 2011-A59 - "09:51 UT" - 2011 AF37


MPEC 2011-A58 - "09:30 UT" - 2004 XH50


<< DOU on 14 Jan. '11 >>  MPEC 2011-A57 - "07:11 UT" - Daily Orbit Update

Observers  on 14 January '11

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
300Bisei Spaceguard Center in Japan, 2 in MPECs 2011-A59 & 2011-A65 -- 2011 AF37, C/2011 A2
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2011-A57, 2011-A59 & 2011-A64 -- 2011 AM37, 2011 AF37, 2005 GW119, 2000 AD205, 40267, 5496, 4688
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPECs 2011-A57 & 2011-A65 -- 2011 AG5, C/2011 A2
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2011-A65 -- C/2011 A2
704LINEAR in New Mexico, 6 in MPEC 2011-A57 -- 2010 YB, 2010 WE9, 2007 EM88, 48603, 40267, 34613
J75La Sagra Obs. in Spain, 5 in MPEC 2011-A57 -- 153201, 137052, 4954, 3554, 1864
H11LightBuckets Obs. Rodeo in New Mexico, 1 in MPEC 2011-A59 -- 2011 AF37
H01Magdalena Ridge Obs. (MRO) in New Mexico, 9 in MPECs 2011-A58, 2011-A59, 2011-A60, 2011-A61, 2011-A62, 2011-A63, 2011-A64, 2011-A65 & 2011-A66 -- 2011 AN37, 2011 AM37, 2011 AL37, 2011 AK37, 2011 AJ37, 2011 AH37, 2011 AF37, C/2011 A2, 2004 XH50
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2011-A57, 2011-A58, 2011-A61, 2011-A63 & 2011-A66 -- 2011 AN37, 2011 AL37, 2011 AJ37, 2010 JH87, 2004 XH50, 2001 XF1, 34613, 144332, 3102
I89Nerpio Obs. in Italy, 1 in MPEC 2011-A65 -- C/2011 A2
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2011-A57 -- 2010 XP51
H36Sandlot Obs. in Kansas, 5 in MPECs 2011-A57, 2011-A59, 2011-A62 & 2011-A65 -- 2011 AU4, 2011 AL24, 2011 AK37, 2011 AF37, C/2011 A2
204Schiaparelli Obs. in Italy, 9 in MPEC 2011-A57 -- 2011 AC3, 2011 AB3, 2011 AA23, 2010 XT45, 2010 PR10, 2005 GW119, 2003 BA21, 2002 KL3, 2002 AV31
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-A57 -- 2011 AN16
691Spacewatch 0.9m telescope in Arizona, 19 in MPECs 2011-A57, 2011-A62, 2011-A63 & 2011-A65 -- 2011 AL37, 2011 AL24, 2011 AK37, C/2011 A2, 2010 WB9, 2010 JH87, 2006 OB5, 2000 QN130, 2000 CR101, 96315, 89355, 85990, 68548, 53550, 34613, 242147, 153958, 144411, 139056
291Spacewatch 1.8m telescope in Arizona, 21 in MPECs 2011-A57, 2011-A58, 2011-A59, 2011-A60, 2011-A61, 2011-A62, 2011-A63, 2011-A64 & 2011-A65 -- 2011 AT26, 2011 AS26, 2011 AR26, 2011 AM37, 2011 AM24, 2011 AM12, 2011 AL37, 2011 AK37, 2011 AJ37, 2011 AH37, 2011 AG5, 2011 AF37, 2011 AA23, C/2011 A2, 2010 XW58, 2010 XC25, 2010 XC15, 2010 VF1, 2006 DT14, 2004 XH50, 2002 PD130
H10Tzec Maun Obs. Mayhill in New Mexico, 3 in MPECs 2011-A58, 2011-A59 & 2011-A63 -- 2011 AL37, 2011 AF37, 2004 XH50
C51WISE in Earth polar orbit, 1 in MPEC 2011-A60 -- 2011 AH37
I15Wishing Star Obs. in Rhode Island, 4 in MPEC 2011-A57 -- 2007 EM88, 152563, 111253, 5496
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 January '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 AL37JPL Sentry1933209015.6e-09-7.98-7.980JPL: "Analysis based on 19 observations spanning 1.0553 days (2011-Jan-13.31599 to 2011-Jan-14.3713)." Diameter approximately 0.051 km. from mean, weighted H=24.1.
2011 AK37JPL Sentry1933210421.5e-08-8.23-8.500JPL: "Analysis based on 21 observations spanning 1.1258 days (2011-Jan-13.30429 to 2011-Jan-14.43005)." Diameter approximately 0.030 km. from mean, weighted H=25.3.
2011 AA37NEODyS15562023-2071166.19e-07-5.14-5.460NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2011-01-13.329 to 2011-01-13.709."
JPL Sentry01002023-2110422.7e-06-4.50-5.090JPL: "Analysis based on 14 observations spanning .37979 days (2011-Jan-13.32845 to 2011-Jan-13.70824)." Diameter approximately 0.085 km. from mean, weighted H=23.0.
2011 AZ36NEODyS15562042-2084113.89e-08-7.44-8.240NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2011-01-13.281 to 2011-01-13.730."
JPL Sentry01002017-21101924.2e-07-6.53-7.870JPL: "Analysis based on 9 observations spanning .44921 days (2011-Jan-13.2805 to 2011-Jan-13.72971)." Diameter approximately 0.032 km. from mean, weighted H=25.1.
2011 AT26JPL Sentry1555R E M O V E DJPL: Risk listing removed at 1052 UTC.
NEODyS1555R E M O V E D-
2011 AM24NEODyS15562033-2089152.41e-07-4.28-4.30NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2011-01-11.452 to 2011-01-14.272."
JPL Sentry15552024-21082053.2e-06-3.16-3.380JPL: "Analysis based on 32 observations spanning 2.8195 days (2011-Jan-11.45149 to 2011-Jan-14.27094)." Diameter approximately 0.270 km. from mean, weighted H=20.5.
2011 AM12NEODyS15562015-2089324.67e-07-2.73-2.920NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2011-01-08.607 to 2011-01-14.173."
JPL Sentry15552015-2109551.1e-06-2.72-3.070JPL: "Analysis based on 36 observations spanning 5.5656 days (2011-Jan-08.60627 to 2011-Jan-14.17183)." Diameter approximately 0.420 km. from mean, weighted H=19.5.
2011 AG5NEODyS15562036-2052102.95e-05-3.01-3.220NEODyS: "Based on 50 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-01-14.118."
JPL Sentry15552033-2052122.9e-05-3.03-3.240JPL: "Analysis based on 50 observations spanning 5.8497 days (2011-Jan-08.2673 to 2011-Jan-14.11698)." Diameter approximately 0.130 km. from mean, weighted H=22.1.
2010 XW58NEODyS15562065-208371.07e-06-6.08-6.210NEODyS: "Based on 52 optical observations (of which 1 are rejected as outliers) from 2010-12-11.475 to 2011-01-14.259."
JPL Sentry15552065-2108144.3e-06-5.59-6.190JPL: "Analysis based on 51 observations spanning 33.785 days (2010-Dec-11.47391 to 2011-Jan-14.25848)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
2010 XC25NEODyS15562050-205333.54e-06-3.32-3.340NEODyS: "Based on 97 optical observations (of which 2 are rejected as outliers) from 2010-12-08.378 to 2011-01-13.533."
JPL Sentry15552050-205323.5e-06-3.33-3.340JPL: "Analysis based on 95 observations spanning 36.155 days (2010-Dec-08.37716 to 2011-Jan-13.53254)." Diameter approximately 0.230 km. from mean, weighted H=20.8.

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 14 January '11

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

2255Grabbed MPEC 2011-A66 - 2011 AN37 - see above
2147Grabbed MPEC 2011-A61 - 2011 AJ37 - see above
Grabbed MPEC 2011-A62 - 2011 AK37 - see above
Grabbed MPEC 2011-A63 - 2011 AL37 - see above
Grabbed MPEC 2011-A64 - 2011 AM37 - see above
Grabbed MPEC 2011-A65 - Comet C/2011 A2 (Scotti) - see above
1933Noted that JPL Sentry has posted 2011 AK37 as an impact risk - see above
Noted that JPL Sentry has posted 2011 AL37 as an impact risk - see above
1556Noted that NEODyS has updated its 2010 XC25 risk assessment - see above
Noted that NEODyS has updated its 2010 XW58 risk assessment - see above
Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that NEODyS has updated its 2011 AM12 risk assessment - see above
Noted that NEODyS has updated its 2011 AM24 risk assessment - see above
1555Noted that JPL Sentry has updated its 2010 XC25 risk assessment - see above
Noted that JPL Sentry has updated its 2010 XW58 risk assessment - see above
Noted that NEODyS has posted 2011 AA37 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 AM12 risk assessment - see above
Noted that JPL Sentry has updated its 2011 AM24 risk assessment - see above
Noted that JPL Sentry has removed 2011 AT26 as an impact risk - see above
Noted that NEODyS has removed 2011 AT26 as an impact risk - see above
Noted that NEODyS has posted 2011 AZ36 as an impact risk - see above
Grabbed MPEC 2011-A57 - Daily Orbit Update - see above
Grabbed MPEC 2011-A58 - 2004 XH50 - see above
Grabbed MPEC 2011-A59 - 2011 AF37 - see above
Grabbed MPEC 2011-A60 - 2011 AH37 - see above
0100Noted that JPL Sentry has posted 2011 AA37 as an impact risk - see above
Noted that JPL Sentry has posted 2011 AZ36 as an impact risk - see above