Contents  on 20 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 20 November '11

The MPC's NEO Confirmation Page has 14 listings

When last checked at 2310 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fourteen objects listed. Of these, eight were "one nighters."

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 20 November '11

Minor Planet Electronic Circulars

As of last check at 2310 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 20 Nov. '11 >>  MPEC 2011-W30 - "06:04 UT" - Daily Orbit Update

Observers  on 20 November '11

A total of 23 observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPEC 2011-W30 -- 2011 VB, 2011 UZ255, 2011 UX192, 2011 UH21, 2011 UC292, 2011 QE38, 2011 KP17, 2008 DG5
A88Bolzaneto Obs. in Italy, 2 in MPEC 2011-W30 -- 42286, 170502
B66Casasco Obs. in Italy, 3 in MPEC 2011-W30 -- 2011 SL102, 2005 YU55, 170502
160Castelmartini Obs. in Italy, 15 in MPEC 2011-W30 -- 2011 WA, 2011 UZ275, 2011 UU106, 2011 SR69, 2011 SL102, 2011 RR12, 2011 LC19, 219071, 208617, 175706, 170502, 163081, 138852, 138524, 433
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2011-W30 -- 2011 UU106, 85709, 304088, 285179, 190166, 154330, 137799, 11398
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPEC 2011-W30 -- 2011 WM2, 2011 SS67, 2011 QF14, 2011 OL51, 2011 GD62, 2009 VO24, 2009 AV, 2004 XK50, 112221, 1980
106Crni Vrh Obs. in Slovenia, 2 in MPEC 2011-W30 -- 137671, 3691
I63Cygnus Obs., 1 in MPEC 2011-W30 -- 2005 YU55
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-W30 -- 2011 WV4
J95Great Shefford Obs. in England, 6 in MPEC 2011-W30 -- 2011 WU4, 2011 WS2, 2011 WQ4, 2011 WQ2, 2011 WA, 2011 VP12
C32Ka-Dar Obs. TAU Station in Russia, 1 in MPEC 2011-W30 -- 2011 WQ4
G89Kachina Obs. in Arizona, 1 in MPEC 2011-W30 -- 2011 WC
704LINEAR in New Mexico, 8 in MPEC 2011-W30 -- 2011 SL102, 2011 OQ5, 2004 QB17, 2004 JO2, 136923, 5653, 3988, 1036
B33Libbiano Obs. in Italy, 2 in MPEC 2011-W30 -- 2011 WQ2, 2011 UV158
B82Maidbronn Obs. in Germany, 1 in MPEC 2011-W30 -- 2005 YU55
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2011-W30 -- 285331, 16816
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2011-W30 -- 2011 VP12
586Pic du Midi Obs. in France, 2 in MPEC 2011-W30 -- 2011 VP12, 4183
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2011-W30 -- 22771, 154330
632San Polo A Mosciano Obs., 4 in MPEC 2011-W30 -- 2011 WA, 2011 UZ275, 2011 UU106, 2011 OV4
E12Siding Spring Survey (SSS) in New South Wales, 5 in MPEC 2011-W30 -- 2011 SF3, 2005 WS3, 2002 VP85, 87684, 8035
B18Terskol Obs. in Russia, 2 in MPEC 2011-W30 -- 2011 WO4, 2005 YU55
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2011-W30 -- 37336
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 November '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2310 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 WQ4JPL Sentry1631R E M O V E DJPL: Risk listing removed at 0852 UTC.
2011 WO4JPL Sentry1631R E M O V E DJPL: Risk listing removed at 0855 UTC.
2011 WS2NEODyS1631R E M O V E D-
JPL Sentry1631R E M O V E DJPL: Risk listing removed at 0910 UTC.
2011 WQ2NEODyS1631R E M O V E D-
JPL Sentry1631R E M O V E DJPL: Risk listing removed at 0852 UTC.
2011 UZ255JPL Sentry16312066-208931.6e-05-4.02-4.030JPL: "Analysis based on 82 observations spanning 18.860 days (2011-Oct-30.44574 to 2011-Nov-18.305253)." Diameter approximately 0.075 km. from mean, weighted H=23.3.
NEODyS16312066-208951.06e-05-4.19-4.220NEODyS: "Based on 82 optical observations (of which 0 are rejected as outliers) from 2011-10-30.447 to 2011-11-18.306."
2008 SH148JPL Sentry05172014-21101027.1e-07-6.68-7.340JPL: "Analysis based on 11 observations spanning .10211 days (2008-Sep-29.18897 to 2008-Sep-29.29108)." Diameter approximately 0.020 km. from mean, weighted H=26.1.

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 20 November '11

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

1631Noted that JPL Sentry has updated its 2011 UZ255 risk assessment - see above
Noted that NEODyS has updated its 2011 UZ255 risk assessment - see above
Noted that JPL Sentry has removed 2011 WO4 as an impact risk - see above
Noted that JPL Sentry has removed 2011 WQ2 as an impact risk - see above
Noted that NEODyS has removed 2011 WQ2 as an impact risk - see above
Noted that JPL Sentry has removed 2011 WQ4 as an impact risk - see above
Noted that JPL Sentry has removed 2011 WS2 as an impact risk - see above
Noted that NEODyS has removed 2011 WS2 as an impact risk - see above
Grabbed MPEC 2011-W30 - Daily Orbit Update - see above
0517Noted that JPL Sentry has updated its 2008 SH148 risk assessment - see above