Contents  on 12 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 12 February '11

The MPC's NEO Confirmation Page has 16 listings: 2 new, 14 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and fourteen updated listings. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 27 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 12 February '11

Minor Planet Electronic Circulars

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


MPEC 2011-C79 - "23:15 UT" - Comet C/2011 C1 (McNaught)


MPEC 2011-C78 - "20:40 UT" - 2009 CA2


MPEC 2011-C77 - "14:10 UT" - 2011 CY46


MPEC 2011-C76 - "14:02 UT" - 2011 CX46


MPEC 2011-C75 - "13:53 UT" - 2011 CW46


MPEC 2011-C74 - "13:48 UT" - 2011 CV46


MPEC 2011-C73 - "13:40 UT" - 2011 CU46


MPEC 2011-C72 - "13:23 UT" - 2011 BO59


MPEC 2011-C71 - "11:58 UT" - 2009 HU2


MPEC 2011-C70 - "11:55 UT" - 2009 BH81


<< DOU on 12 Feb. '11 >>  MPEC 2011-C69 - "07:10 UT" - Daily Orbit Update

Observers  on 12 February '11

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPECs 2011-C69, 2011-C70, 2011-C71 & 2011-C78 -- 2011 CZ6, 2011 CY7, 2011 CP14, 2011 CO14, 2011 CG2, 2011 CC22, 2011 BK24, 2011 AM24, 2011 AF37, 2010 XY82, 2009 HU2, 2009 CA2, 2009 BH81
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2011-C69, 2011-C72 & 2011-C77 -- 2011 CZ6, 2011 CY7, 2011 CY46, 2011 BO59, 5646, 1866
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2011-C72 & 2011-C77 -- 2011 CY46, 2011 BO59
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 4 in MPECs 2011-C69, 2011-C72, 2011-C76 & 2011-C77 -- 2011 CY46, 2011 CX46, 2011 BO59, 96315
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2011-C79 -- C/2011 C1
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-C70 -- 2009 BH81
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2011-C69 -- 9856
J28Jaen Obs. in Spain, 2 in MPEC 2011-C69 -- 23183, 175706
704LINEAR in New Mexico, 15 in MPECs 2011-C69, 2011-C72, 2011-C73, 2011-C74 & 2011-C75 -- 2011 CW46, 2011 CV46, 2011 CU46, 2011 BO59, 2011 BA12, 2011 AM24, 2010 LR68, 2000 CR101, 48603, 36284, 34613, 22771, 175706, 162781, 152889
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2011-C69, 2011-C72, 2011-C76, 2011-C77 & 2011-C79 -- 2011 CY46, 2011 CX46, C/2011 C1, 2011 BO59, 2011 AX22, 2011 AK37
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2011-C69 -- 2011 CY6, 2010 YB, 2008 BP16
118Modra Obs. in Slovakia, 1 in MPEC 2011-C69 -- 2011 BX10
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2011-C69, 2011-C72, 2011-C73, 2011-C74, 2011-C75, 2011-C76 & 2011-C79 -- 2011 CX46, 2011 CW46, 2011 CV46, 2011 CU46, C/2011 C1, 2011 BO59, 2011 BG59, 86819, 9856
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2011-C71 -- 2009 HU2
I89Nerpio Obs. in Italy, 1 in MPEC 2011-C79 -- C/2011 C1
H06%Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-C79 -- C/2011 C1
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2011-C73 & 2011-C77 -- 2011 CY46, 2011 CU46
H36Sandlot Obs. in Kansas, 7 in MPECs 2011-C72, 2011-C73, 2011-C74, 2011-C75, 2011-C76, 2011-C77 & 2011-C79 -- 2011 CY46, 2011 CX46, 2011 CW46, 2011 CV46, 2011 CU46, C/2011 C1, 2011 BO59
204Schiaparelli Obs. in Italy, 14 in MPECs 2011-C69, 2011-C72, 2011-C77 & 2011-C79 -- 2011 CY46, 2011 CR1, C/2011 C1, 2011 BV15, 2011 BO59, 2011 BO24, 2011 BJ39, 2011 BH39, 2011 BD40, 2006 YD, 2005 VQ, 2004 CK39, 2003 DX10, 1999 NA5
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-C79 -- C/2011 C1
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2011-C69 & 2011-C76 -- 2011 CX46, 2011 BY18, 2011 BQ50, 2011 BD40, 2011 BA45, 2011 BA12, 2011 AS26, 2011 AR26, 2011 AM12, 2010 XZ67
H10Tzec Maun Obs. Mayhill in New Mexico, 2 in MPECs 2011-C72 & 2011-C79 -- C/2011 C1, 2011 BO59
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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 CY46JPL Sentry16452069-210962.4e-09-6.26-6.590JPL: "Analysis based on 24 observations spanning 1.0752 days (2011-Feb-11.31507 to 2011-Feb-12.39025)." Diameter approximately 0.354 km. from mean, weighted H=19.9.
2011 CW46JPL Sentry16452021-21081311.1e-06-5.51-5.870JPL: "Analysis based on 11 observations spanning 1.0974 days (2011-Feb-11.24048 to 2011-Feb-12.33793)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
2011 CU46JPL Sentry18042020-21104142.3e-05-4.82-5.620JPL: "Analysis based on 14 observations spanning 1.1236 days (2011-Feb-11.17573 to 2011-Feb-12.29932)." Diameter approximately 0.028 km. from mean, weighted H=25.4.
2011 CC22NEODyS16462045-204511.5e-11-8.69-8.690NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2011-02-06.262 to 2011-02-10.323."
JPL Sentry1645R E M O V E DJPL: Risk listing removed at 1129 UTC.
2011 BQ50NEODyS16462082-208212.9e-08-9.45-9.450NEODyS: "Based on 25 optical observations (of which 1 are rejected as outliers) from 2011-01-30.403 to 2011-02-11.415."
JPL Sentry16452079-210721.4e-06-7.93-8.140JPL: "Analysis based on 25 observations spanning 12.011 days (2011-Jan-30.4027 to 2011-Feb-11.41411)." Diameter approximately 0.007 km. from mean, weighted H=28.3.
2011 BH39NEODyS1645R E M O V E D-
JPL Sentry1645R E M O V E DJPL: Risk listing removed at 1212 UTC.
2011 BA12JPL Sentry16452079-211053.6e-08-6.61-6.920JPL: "Analysis based on 138 observations spanning 17.308 days (2011-Jan-25.1938 to 2011-Feb-11.50157)." Diameter approximately 0.100 km. from mean, weighted H=22.6.
2011 AK37JPL Sentry1645209715.6e-06-5.56-5.560JPL: "Analysis based on 32 observations spanning 29.147 days (2011-Jan-13.30429 to 2011-Feb-11.45098)." Diameter approximately 0.031 km. from mean, weighted H=25.2.
2011 AX22NEODyS16462055-2090154.85e-04-3.16-3.180NEODyS: "Based on 64 optical observations (of which 0 are rejected as outliers) from 2011-01-10.306 to 2011-02-11.365."
JPL Sentry16452055-2108155.0e-04-3.15-3.170JPL: "Analysis based on 64 observations spanning 32.058 days (2011-Jan-10.30552 to 2011-Feb-11.36401)." Diameter approximately 0.039 km. from mean, weighted H=24.7.

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 February '11

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

2359Grabbed MPEC 2011-C79 - Comet C/2011 C1 (McNaught) - see above
2101Grabbed MPEC 2011-C78 - 2009 CA2 - see above
1804Noted that JPL Sentry has posted 2011 CU46 as an impact risk - see above
1646Noted that NEODyS has updated its 2011 AX22 risk assessment - see above
Noted that NEODyS has updated its 2011 BQ50 risk assessment - see above
Noted that NEODyS has updated its 2011 CC22 risk assessment - see above
1645Noted that JPL Sentry has updated its 2011 AK37 risk assessment - see above
Noted that JPL Sentry has updated its 2011 AX22 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BA12 risk assessment - see above
Noted that JPL Sentry has removed 2011 BH39 as an impact risk - see above
Noted that NEODyS has removed 2011 BH39 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 BQ50 risk assessment - see above
Noted that JPL Sentry has removed 2011 CC22 as an impact risk - see above
Noted that JPL Sentry has posted 2011 CW46 as an impact risk - see above
Noted that JPL Sentry has posted 2011 CY46 as an impact risk - see above
Grabbed MPEC 2011-C69 - Daily Orbit Update - see above
Grabbed MPEC 2011-C70 - 2009 BH81 - see above
Grabbed MPEC 2011-C71 - 2009 HU2 - see above
Grabbed MPEC 2011-C72 - 2011 BO59 - see above
Grabbed MPEC 2011-C73 - 2011 CU46 - see above
Grabbed MPEC 2011-C74 - 2011 CV46 - see above
Grabbed MPEC 2011-C75 - 2011 CW46 - see above
Grabbed MPEC 2011-C76 - 2011 CX46 - see above
Grabbed MPEC 2011-C77 - 2011 CY46 - see above