Contents  on 22 October '11


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 October '11

The MPC's NEO Confirmation Page has 58 listings

When last checked at 2302 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 58 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 59 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 October '11

Minor Planet Electronic Circulars

As of last check at 2302 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 22 Oct. '11 >>  MPEC 2011-U43 - "06:03 UT" - Daily Orbit Update

Observers  on 22 October '11

Seventeen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2011-U43 -- 2011 UU, 2011 UP20, 2011 UN20, 2011 UJ21, 2011 UB, 2011 TN9, 2011 SO32, 2011 SM102, 2004 ST9
703Catalina Sky Survey (CSS) in Arizona, 10 in MPEC 2011-U43 -- 2011 TA4, 2011 RR12, 2011 KN9, 2004 TH10, 16960, 16816, 162273, 152942, 143678, 11398
821Cordoba-Bosque Alegre Obs., 1 in MPEC 2011-U43 -- 2011 SR25
I45Crucis Obs., 2 in MPEC 2011-U43 -- 2011 HC36, 1990 UA
I70Edney House Obs., 1 in MPEC 2011-U43 -- 297418
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-U43 -- 2011 UH20
246KLENOT in the Czech Republic, 3 in MPEC 2011-U43 -- 2011 UT, 2011 TN9, 2011 TA4
046Klet Obs. in the Czech Republic, 1 in MPEC 2011-U43 -- 2011 MD11
704LINEAR in New Mexico, 11 in MPEC 2011-U43 -- 2011 UK21, 2011 TN9, 2011 SP68, 2011 HC36, 2001 UE5, 90075, 190208, 159368, 137799, 5653, 2201
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPEC 2011-U43 -- 2011 LJ19, 2011 BE38, 1994 RC, 274855, 226514, 159368
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2011-U43 -- 2011 SP68, 2011 LJ19
233San Vito Obs. in Italy, 2 in MPEC 2011-U43 -- 53430, 36284
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-U43 -- 2011 UJ21
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2011-U43 -- 2011 UN20, 2011 SW71, 2011 SU232, 2001 UE5
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2011-U43 -- 2011 UU20, 2011 UT20, 2011 TK, 2011 SG189, 2011 SD173
A98Taurus-1 Obs. in Belarus, 1 in MPEC 2011-U43 -- 2011 SR69
C70Uiterstegracht Station, 1 in MPEC 2011-U43 -- 1036
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 October '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2302 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.





Notes for Today's Latest Risk Assessments
2011 UL21NEODyS15472020-2089632.65e-07-1.49-2.220NEODyS: "Based on 51 optical observations (of which 0 are rejected as outliers) from 2011-10-17.483 to 2011-10-21.465."
2011 UH20JPL Sentry15472042-2109254.2e-06-3.20-3.990JPL: "Analysis based on 27 observations spanning 3.1713 days (2011-Oct-18.15098 to 2011-Oct-21.322278)." Diameter approximately 0.220 km. from mean, weighted H=20.9.
NEODyS15472042-2089248.44e-07-3.87-4.570NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2011-10-18.152 to 2011-10-21.323."
2011 UTJPL Sentry15472034-210985.0e-06-5.82-6.350JPL: "Analysis based on 43 observations spanning 3.0727 days (2011-Oct-17.41107 to 2011-Oct-20.48379)." Diameter approximately 0.023 km. from mean, weighted H=25.8.
NEODyS15472034-208342.07e-06-5.88-6.330NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2011-10-17.412 to 2011-10-20.485."
2011 SD173JPL Sentry15472062-207762.6e-07-3.96-4.050JPL: "Analysis based on 39 observations spanning 26.969 days (2011-Sep-24.42522 to 2011-Oct-21.394)." Diameter approximately 0.420 km. from mean, weighted H=19.5.
NEODyS15472062-2090197.74e-07-3.55-3.710NEODyS: "Based on 39 optical observations (of which 1 are rejected as outliers) from 2011-09-24.426 to 2011-10-21.395."

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 October '11

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

1547Noted that JPL Sentry has updated its 2011 SD173 risk assessment - see above
Noted that NEODyS has updated its 2011 SD173 risk assessment - see above
Noted that JPL Sentry has updated its 2011 UH20 risk assessment - see above
Noted that NEODyS has updated its 2011 UH20 risk assessment - see above
Noted that NEODyS has posted 2011 UL21 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 UT risk assessment - see above
Noted that NEODyS has updated its 2011 UT risk assessment - see above
Grabbed MPEC 2011-U43 - Daily Orbit Update - see above