Contents  on 30 November '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 30 November '11

The MPC's NEO Confirmation Page has 25 listings

When last checked today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 25 objects listed. Of these, 20 were "one nighters." So far The Tracking News has counted a total of 31 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 30 November '11

Minor Planet Electronic Circulars

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


MPEC 2011-W85 - "20:13 UT" - 2011 WS74


MPEC 2011-W84 - "20:11 UT" - 2011 WR74


<< DOU on 30 Nov. '11 >>  MPEC 2011-W83 - "06:06 UT" - Daily Orbit Update


MPEC 2011-W82 - "02:15 UT" - Comet P/2010 UH55 (Spacewatch)

Observers  on 30 November '11

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
G51Byrne Obs. in southern California, 1 in MPEC 2011-W84 -- 2011 WR74
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2011-W83 & 2011-W85 -- 2011 WS74, 2011 WM2, 2011 UU158, 2011 UU106, 2005 XB1, 85818, 24475, 162273
822Cordoba Obs. in Argentina, 1 in MPEC 2011-W85 -- 2011 WS74
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2011-W83 & 2011-W85 -- 2011 WS74, 2011 WE44
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-W82 -- P/2010 UH55
J95Great Shefford Obs. in England, 2 in MPECs 2011-W83 & 2011-W85 -- 2011 WS74, 2011 WN69
240Herrenberg Obs. in Germany, 2 in MPEC 2011-W83 -- 302169, 138852
J37Huelva Obs. in Spain, 2 in MPEC 2011-W83 -- 2011 SR69, 24475
B15Inastars Obs. in Germany, 1 in MPEC 2011-W83 -- 2011 WA
246KLENOT in the Czech Republic, 4 in MPECs 2011-W83 & 2011-W85 -- 2011 WS74, 2011 WR69, 2011 WK5, 2011 WC39
C32Ka-Dar Obs. TAU Station in Russia, 1 in MPEC 2011-W82 -- P/2010 UH55
046Klet Obs. in the Czech Republic, 5 in MPECs 2011-W83 & 2011-W85 -- 2011 WS74, 2011 WL2, 2011 WE44, 2011 WC44, 2011 SR69
704LINEAR in New Mexico, 3 in MPEC 2011-W83 -- 2011 WM2, 3352, 2201
B33Libbiano Obs. in Italy, 2 in MPECs 2011-W83 & 2011-W85 -- 2011 WS74, 2011 WR69
C01Lohrmann Obs. in Germany, 3 in MPEC 2011-W83 -- 138852, 138524, 137671
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2011-W84 & 2011-W85 -- 2011 WS74, 2011 WR74
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-W84 -- 2011 WR74
474Mt. John Obs. in New Zealand, 9 in MPEC 2011-W83 -- 2011 WS46, 2011 WR46, 2011 WM2, 2011 WL2, 2011 WG44, 2011 WE44, 2011 WC44, 2011 WC, 2005 XB1
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2011-W83 -- 2011 WK5, 2011 US63, 2000 SD8, 90075
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2011-W83 -- 2011 VP12
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2011-W84 -- 2011 WR74
J41Raheny Obs. in Ireland, 1 in MPEC 2011-W85 -- 2011 WS74
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2011-W85 -- 2011 WS74
H36Sandlot Obs. in Kansas, 2 in MPEC 2011-W83 -- 2011 WV4, 2011 WS46
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-W83 -- 2011 WQ46
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-W83 -- 5332
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2011-W83 -- 2011 SL102, 2008 JF, 25916, 163051, 141079
291Spacewatch 1.8m telescope in Arizona, 18 in MPECs 2011-W83 & 2011-W85 -- 2011 WV4, 2011 WS74, 2011 WR41, 2011 WL2, 2011 WL15, 2011 WK5, 2011 WE44, 2011 WC44, 2011 VH5, 2011 VF9, 2011 UX114, 2011 UL147, 2011 UG256, 2011 UE305, 2011 UE256, 2011 UD256, 2005 VN, 2005 PO
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-W85 -- 2011 WS74
718Wiggins Obs. in Utah, 1 in MPEC 2011-W85 -- 2011 WS74
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 November '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 CLOMON2 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 WN69JPL Sentry16402038-210961.9e-06-6.26-6.490JPL: "Analysis based on 32 observations spanning 1.7314 days (2011-Nov-28.29095 to 2011-Nov-30.02234)." Diameter approximately 0.020 km. from mean, weighted H=26.2.
NEODyS16402064-206821.88e-09-8.94-9.030NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2011-11-28.292 to 2011-11-30.023."
2011 WL2JPL Sentry1640210416.0e-09-6.46-6.460JPL: "Analysis based on 133 observations spanning 13.901 days (2011-Nov-16.31883 to 2011-Nov-30.22008)." Diameter approximately 0.240 km. from mean, weighted H=20.7.
NEODyS1640R E M O V E D-
2011 UE305JPL Sentry1640210924.8e-06-3.78-3.800JPL: "Analysis based on 35 observations spanning 29.989 days (2011-Oct-30.46441 to 2011-Nov-29.45345)." Diameter approximately 0.170 km. from mean, weighted H=21.4.
2007 YMJPL Sentry06082020-21091133.7e-06-5.94-6.800JPL: "Analysis based on 12 observations spanning .12805 days (2007-Dec-17.39661 to 2007-Dec-17.52466)." Diameter approximately 0.020 km. from mean, weighted H=26.2.

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 30 November '11

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

2359Grabbed MPEC 2011-W84 - 2011 WR74 - see above
Grabbed MPEC 2011-W85 - 2011 WS74 - see above
1640Noted that JPL Sentry has updated its 2011 UE305 risk assessment - see above
Noted that JPL Sentry has updated its 2011 WL2 risk assessment - see above
Noted that NEODyS has removed 2011 WL2 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 WN69 risk assessment - see above
Noted that NEODyS has posted 2011 WN69 as an impact risk - see above
Grabbed MPEC 2011-W83 - Daily Orbit Update - see above
0607Noted that JPL Sentry has updated its 2007 YM risk assessment - see above
0246Grabbed MPEC 2011-W82 - Comet P/2010 UH55 (Spacewatch) - see above