Contents  on 22 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 22 November '11

The MPC's NEO Confirmation Page has 7 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of fifteen 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 22 November '11

Minor Planet Electronic Circulars

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


MPEC 2011-W36 - "17:47 UT" - 2011 WK14


<< DOU on 22 Nov. '11 >>  MPEC 2011-W35 - "06:04 UT" - Daily Orbit Update


MPEC 2011-W34 - "02:33 UT" - 2011 RC17

Observers  on 22 November '11

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

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2011-W35 -- 2011 WL2
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-W35 -- 2011 GA55
A81Balzaretto Obs. in Italy, 1 in MPEC 2011-W35 -- 5143
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-W35 -- 2011 WK5
160Castelmartini Obs. in Italy, 10 in MPEC 2011-W35 -- 2011 UZ275, 2011 UU106, 2011 SR69, 2011 SL102, 2011 RR12, 2011 LC19, 170502, 138852, 138524, 433
703Catalina Sky Survey in Arizona, 1 in MPEC 2011-W34 -- 2011 RC17
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2011-W35 & 2011-W36 -- 2011 WP4, 2011 WO4, 2011 WM2, 2011 WL2, 2011 WK14, 2011 VP12
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2011-W35 -- 2011 WM2, 2011 WL2
157Frasso Sabino Obs. in Italy, 2 in MPEC 2011-W35 -- 2011 VV5, 2011 UV158
J95Great Shefford Obs. in England, 1 in MPEC 2011-W36 -- 2011 WK14
379Hamamatsu-Yuto Obs. in Japan, 7 in MPEC 2011-W35 -- 2011 SR69, 2011 SL102, 2011 LC19, 2004 JO2, 170502, 154302, 2201
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2011-W34 -- 2011 RC17
B15Inastars Obs. in Germany, 2 in MPEC 2011-W35 -- 2011 WK5, 2011 WA
C10Maisoncelles Obs. in France, 1 in MPEC 2011-W35 -- 3200
B28Mandi Obs. in Italy, 1 in MPEC 2011-W35 -- 2011 WK5
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2011-W34 & 2011-W36 -- 2011 WK14, 2011 RC17
586Pic du Midi Obs. in France, 4 in MPEC 2011-W35 -- 2011 WP4, 2005 YU55, 2001 YE4, 4183
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPECs 2011-W34 & 2011-W35 -- 2011 RC17, 96315, 16816
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-W35 -- 2011 WQ4
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-W36 -- 2011 WK14
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-W34 -- 2011 RC17
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2011-W36 -- 2011 WK14
A98Taurus-1 Obs. in Belarus, 3 in MPEC 2011-W35 -- 2011 SR69, 2011 SL102, 2011 LC19
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 WQ4JPL Sentry1701204812.5e-07-7.72-7.720JPL: "Analysis based on 47 observations spanning 2.8800 days (2011-Nov-18.27488 to 2011-Nov-21.15484)." Diameter approximately 0.012 km. from mean, weighted H=27.3.
NEODyS17012048-204814.36e-07-7.47-7.470NEODyS: "Based on 47 optical observations (of which 1 are rejected as outliers) from 2011-11-18.276 to 2011-11-21.156."
2011 WL2JPL Sentry17012065-2106158.8e-06-3.24-3.360JPL: "Analysis based on 77 observations spanning 5.8415 days (2011-Nov-16.31883 to 2011-Nov-22.16035)." Diameter approximately 0.240 km. from mean, weighted H=20.7.
NEODyS17012051-2090102.46e-07-4.62-5.040NEODyS: "Based on 77 optical observations (of which 0 are rejected as outliers) from 2011-11-16.320 to 2011-11-22.161."

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 22 November '11

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

1818Grabbed MPEC 2011-W36 - 2011 WK14 - see above
1701Noted that JPL Sentry has updated its 2011 WL2 risk assessment - see above
Noted that NEODyS has updated its 2011 WL2 risk assessment - see above
Noted that JPL Sentry has updated its 2011 WQ4 risk assessment - see above
Noted that NEODyS has posted 2011 WQ4 as an impact risk - see above
Grabbed MPEC 2011-W35 - Daily Orbit Update - see above
0417Grabbed MPEC 2011-W34 - 2011 RC17 - see above