Contents  on 5 February '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 5 February '11

The MPC's NEO Confirmation Page has 33 listings: 11 new, 22 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eleven new and 22 updated listings. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 44 listings on the NEOCP 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 5 February '11

Minor Planet Electronic Circulars

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


MPEC 2011-C23 - "23:27 UT" - 2011 CA4


MPEC 2011-C22 - "22:28 UT" - 2011 CZ3


MPEC 2011-C21 - "22:03 UT" - 2011 CY3


MPEC 2011-C20 - "19:11 UT" - 2007 VG184


MPEC 2011-C19 - "12:48 UT" - 2011 CO2


MPEC 2011-C18 - "11:45 UT" - 2011 CN2


<< DOU on 5 Feb. '11 >>  MPEC 2011-C17 - "07:09 UT" - Daily Orbit Update


MPEC 2011-C16 - "01:44 UT" - Observations and Orbits of Comets

Observers  on 5 February '11

A total of 64 observers appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 14 in MPEC 2011-C16 -- C/2011 A3, P/2011 A2, P/2010 U1, C/2010 B1, C/2009 P1, C/2008 S3, C/2007 VO53, 244P, 241P, 236P, 203P, 65P, 31P, 9P
300Bisei Spaceguard Center in Japan, 9 in MPECs 2011-C16, 2011-C21, 2011-C22 & 2011-C23 -- 2011 CZ3, 2011 CY3, 2011 CA4, C/2010 G2, C/2010 B1, C/2005 L3, 103P, 29P, 10P
I99Blanquita Obs. in Spain, 4 in MPECs 2011-C16 & 2011-C17 -- C/2010 B1, 68350, 175706, 103P
B96Brixiis Obs. in Belgium, 10 in MPEC 2011-C16 -- P/2010 WK, C/2010 S1, C/2010 B1, C/2009 K5, C/2008 S3, 247P, 240P, 123P, 103P, 29P
235CAST Obs. in Italy, 5 in MPEC 2011-C16 -- P/2010 WK, C/2010 B1, 240P, 103P, 73P
160Castelmartini Obs. in Italy, 3 in MPEC 2011-C16 -- P/2010 U2, C/2010 KW7, 247P
703Catalina Sky Survey (CSS) in Arizona, 16 in MPECs 2011-C16, 2011-C17, 2011-C22 & 2011-C23 -- 2011 CZ3, 2011 CA4, 2011 BV10, 2011 BA12, 2010 XZ67, C/2010 X1, C/2010 G2, 2004 YZ23, 2000 CR101, 85275, 48603, 159467, 137125, 73P, 71P, 10P
470Ceccano Obs. in Italy, 1 in MPEC 2011-C17 -- 2011 CG2
A77Chante-Perdrix Obs. in France, 18 in MPEC 2011-C16 -- C/2011 A3, P/2011 A2, P/2011 A1, C/2010 X1, P/2010 WK, C/2010 S1, C/2010 KW7, C/2010 B1, C/2009 K5, 247P, 203P, 162P, 126P, 103P, 88P, 71P, 31P, 29P
J01Cielo Profundo Obs. in Spain, 9 in MPEC 2011-C16 -- C/2011 A3, P/2011 A2, P/2011 A1, C/2010 X1, 247P, 241P, 203P, 31P, 29P
850Cordell-Lorenz Obs. in Tennessee, 2 in MPEC 2011-C16 -- P/2010 WK, 103P
958Dax Obs. in France, 7 in MPEC 2011-C16 -- P/2010 WK, C/2010 B1, 228P, 203P, 123P, 103P, 29P
F65%T. Lister via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-C18 -- 2011 CN2
C18Frasnes-Lez-Anvaing Obs., 3 in MPEC 2011-C16 -- C/2009 K5, 247P, 240P
203GiaGa Obs. in Italy, 5 in MPEC 2011-C17 -- 2011 BA12, 2011 AM24, 2011 AF37, 36284, 175706
355Hadano Obs. in Japan, 19 in MPECs 2011-C16 & 2011-C17 -- 2010 YS, 2010 XP51, 2010 WQ7, 2010 WP8, P/2010 WK, 2010 WE9, 2010 VK188, 2010 TP54, 2010 LF86, C/2009 K5, 2009 DV42, 2007 EM88, 2005 GW119, 2001 DQ8, 2000 AZ93, 23183, 241P, 240P, 103P
379Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2011-C16 -- 103P
H15ISON-NM Obs. in New Mexico, 8 in MPECs 2011-C16 & 2011-C17 -- P/2011 A4, C/2011 A3, P/2011 A1, C/2010 X1, P/2010 D2, C/2009 UG89, 96315, 175706
585Kiev Comet Station in the Ukraine, 1 in MPEC 2011-C16 -- 103P
400Kitami Obs. in Japan, 2 in MPEC 2011-C16 -- P/2011 A1, 247P
046Klet Obs. in the Czech Republic, 6 in MPECs 2011-C16 & 2011-C17 -- 2011 BF39, C/2011 A3, C/2010 X1, P/2010 WK, C/2010 B1, C/2005 L3
704LINEAR in New Mexico, 4 in MPEC 2011-C16 -- 248P, 241P, 231P, 31P
J31La Axarquia Obs. in Spain, 2 in MPEC 2011-C16 -- C/2010 B1, 103P
212La Dehesilla Obs. in Spain, 5 in MPEC 2011-C16 -- P/2011 A1, 247P, 241P, 240P, 103P
J38La Vara Obs. in Spain, 6 in MPEC 2011-C16 -- C/2010 S1, C/2010 B1, 247P, 123P, 103P, 29P
844Los Molinos Obs. in Uruguay, 2 in MPEC 2011-C16 -- C/2010 X1, 29P
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-C16 -- 9P
B82Maidbronn Obs. in Germany, 16 in MPEC 2011-C16 -- P/2010 WK, P/2010 U2, C/2010 S1, C/2010 B1, C/2009 Y1, C/2009 K5, C/2008 S3, 247P, 241P, 240P, 223P, 123P, 103P, 31P, 29P, 10P
C10Maisoncelles Obs. in France, 5 in MPEC 2011-C16 -- C/2010 X1, C/2010 B1, 103P, 88P, 29P
J40Malaga Obs. in Spain, 1 in MPEC 2011-C16 -- 247P
232Masquefa Obs. in Spain, 1 in MPEC 2011-C16 -- 29P
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-C19 -- 2011 CO2
118Modra Obs. in Slovakia, 2 in MPECs 2011-C21 & 2011-C23 -- 2011 CY3, 2011 CA4
213Montcabre Obs. in Spain, 5 in MPEC 2011-C16 -- C/2011 A3, C/2010 B1, 123P, 29P, 10P
900Moriyama Obs. in Japan, 7 in MPEC 2011-C16 -- P/2011 A1, P/2010 WK, C/2010 B1, C/2005 L3, 247P, 240P, 103P
474Mt. John Obs. in New Zealand, 5 in MPEC 2011-C17 -- 2011 BR15, 2011 BJ24, 2011 AA37, 2010 XO56, 2004 LH
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2011-C16, 2011-C18, 2011-C19, 2011-C20 & 2011-C21 -- 2011 CY3, 2011 CO2, 2011 CN2, 2007 VG184, 248P, 244P, 117P
A13Naef Obs. in Switzerland, 3 in MPECs 2011-C16 & 2011-C17 -- 2010 XP51, 152889, 117P
D81Nagano Obs. in Japan, 2 in MPEC 2011-C16 -- C/2010 G2, 29P
D92Osaki Obs. in Japan, 2 in MPEC 2011-C16 -- C/2010 X1, 29P
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2011-C17, 2011-C18 & 2011-C19 -- 2011 CO2, 2011 CN2, 2010 UX6
B49Paus Obs. in Spain, 2 in MPEC 2011-C16 -- 240P, 123P
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 13 in MPEC 2011-C16 -- C/2011 A3, C/2010 X1, P/2010 WK, C/2010 S1, C/2009 Y1, C/2005 L3, 246P, 240P, 223P, 103P, 31P, 29P, 10P
H06#M. Suzuki via RAS Obs. Mayhill in New Mexico, 2 in MPEC 2011-C16 -- C/2010 G2, C/2010 B1
H06%Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-C16 -- 29P
H06|H. Sato in Japan via RAS Obs. Mayhill in New Mexico, 4 in MPEC 2011-C16 -- P/2011 A4, C/2011 A3, P/2010 D2, 248P
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 4 in MPEC 2011-C16 -- C/2010 FB87, C/2010 B1, 103P, 43P
473Remanzacco Obs. in Italy, 2 in MPEC 2011-C16 -- C/2010 B1, 103P
I20Rio Cuarto Obs. in Argentina, 3 in MPEC 2011-C17 -- 2011 BV10, 2011 AL24, 2011 AA37
C09Rouet Obs. in France, 2 in MPEC 2011-C16 -- P/2010 WK, 240P
461SZTE Asteroid Program in Hungary, 1 in MPEC 2011-C16 -- 73P
H36Sandlot Obs. in Kansas, 3 in MPEC 2011-C17 -- 2011 BG40, 2011 AM16, 2011 AL24
B56Sant Pere Obs. in Spain, 2 in MPEC 2011-C16 -- C/2010 B1, 123P
B74Santa Maria de Montmagastrell Obs. in Spain, 4 in MPEC 2011-C16 -- P/2010 WK, C/2009 K5, 241P, 29P
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-C16 -- 29P
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2011-C16 & 2011-C17 -- 2011 CQ1, 9P
G68Sierra Stars Obs. in northern California, 3 in MPEC 2011-C16 -- 152P, 105P, 103P
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2011-C16 -- 231P, 31P
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2011-C16, 2011-C17 & 2011-C18 -- 2011 CN2, 2011 BZ44, 2011 BY18, 2011 BX10, 2011 BW18, 2011 BT15, 2011 BM24, 2011 BJ24, 2011 AW55, 2011 AG5, P/2011 A2
I28Starhoo Obs. in Massachusetts, 1 in MPEC 2011-C17 -- 36284
A71Stixendorf Obs. in Austria, 1 in MPEC 2011-C16 -- 241P
H10Tzec Maun Obs. Mayhill in New Mexico, 25 in MPEC 2011-C16 -- C/2011 A3, P/2011 A1, C/2010 X1, P/2010 WK, C/2010 S1, C/2010 G2, C/2009 UG89, C/2009 K5, C/2007 VO53, C/2007 Q3, C/2005 L3, 247P, 241P, 240P, 223P, 203P, 123P, 103P, 88P, 74P, 73P, 43P, 31P, 29P, 10P
D96Tzec Maun Obs. Moorook in South Australia, 3 in MPEC 2011-C16 -- C/2010 FB87, C/2010 A4, C/2009 F4
H47Vicksburg Obs. in Mississippi, 6 in MPEC 2011-C16 -- C/2010 X1, P/2010 WK, C/2009 K5, C/2005 L3, 43P, 29P
C51WISE in Earth polar orbit, 2 in MPEC 2011-C17 -- 2006 YT13, 141495
C28Wellinghofen Obs. in Germany, 3 in MPEC 2011-C16 -- C/2010 B1, C/2009 Y1, 103P
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 February '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 CZ3JPL Sentry23592086-2110111.6e-07-7.73-8.000JPL: "Analysis based on 11 observations spanning .29756 days (2011-Feb-05.21914 to 2011-Feb-05.5167)." Diameter approximately 0.016 km. from mean, weighted H=26.6.
2011 CN2JPL Sentry16512024-2106181.1e-08-4.37-4.850JPL: "Analysis based on 13 observations spanning 2.8788 days (2011-Feb-02.5079 to 2011-Feb-05.38668)." Diameter approximately 0.684 km. from mean, weighted H=18.5.
2011 CQ1JPL Sentry1651R E M O V E DJPL: Risk listing removed at 1146 UTC.
2011 BJ24JPL Sentry1651R E M O V E DJPL: Risk listing removed at 1140 UTC.
2011 BT15JPL Sentry16512027-21111065.3e-05-2.83-3.240JPL: "Analysis based on 28 observations spanning 11.916 days (2011-Jan-24.28933 to 2011-Feb-05.20554)." Diameter approximately 0.141 km. from mean, weighted H=21.9.
NEODyS16512027-2090824.83e-05-2.70-3.110NEODyS: "Based on 28 optical observations (of which 1 are rejected as outliers) from 2011-01-24.290 to 2011-02-05.206."
2011 BA12JPL Sentry16512079-211051.2e-05-4.07-4.220JPL: "Analysis based on 69 observations spanning 10.878 days (2011-Jan-25.1938 to 2011-Feb-05.07207)." Diameter approximately 0.095 km. from mean, weighted H=22.8.
NEODyS16512079-207917.8e-06-4.21-4.210NEODyS: "Based on 69 optical observations (of which 0 are rejected as outliers) from 2011-01-25.195 to 2011-02-05.073."
2011 BX10JPL Sentry1651R E M O V E DJPL: Risk listing removed at 1050 UTC.
2011 AG5JPL Sentry16512036-2058121.1e-04-2.43-2.630JPL: "Analysis based on 86 observations spanning 27.950 days (2011-Jan-08.2673 to 2011-Feb-05.21731)." Diameter approximately 0.140 km. from mean, weighted H=22.0.
NEODyS16512036-2058151.09e-04-2.44-2.640NEODyS: "Based on 86 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-02-05.218."

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 5 February '11

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

2359Noted that JPL Sentry has posted 2011 CZ3 as an impact risk - see above
Grabbed MPEC 2011-C23 - 2011 CA4 - see above
2300Grabbed MPEC 2011-C22 - 2011 CZ3 - see above
2211Grabbed MPEC 2011-C21 - 2011 CY3 - see above
1921Grabbed MPEC 2011-C20 - 2007 VG184 - see above
1651Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BA12 risk assessment - see above
Noted that NEODyS has updated its 2011 BA12 risk assessment - see above
Noted that JPL Sentry has removed 2011 BJ24 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BT15 risk assessment - see above
Noted that NEODyS has updated its 2011 BT15 risk assessment - see above
Noted that JPL Sentry has removed 2011 BX10 as an impact risk - see above
Noted that JPL Sentry has posted 2011 CN2 as an impact risk - see above
Noted that JPL Sentry has removed 2011 CQ1 as an impact risk - see above
Grabbed MPEC 2011-C17 - Daily Orbit Update - see above
Grabbed MPEC 2011-C18 - 2011 CN2 - see above
Grabbed MPEC 2011-C19 - 2011 CO2 - see above
0212Grabbed MPEC 2011-C16 - Observations and Orbits of Comets - see above