Contents  on 4 September '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 4 September '11

The MPC's NEO Confirmation Page has 19 listings

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

New MPECs  on 4 September '11

Minor Planet Electronic Circulars

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


MPEC 2011-R18 - "16:19 UT" - 2006 FY35


<< DOU on 4 Sept. '11 >>  MPEC 2011-R17 - "06:04 UT" - Daily Orbit Update

Observers  on 4 September '11

Thirteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPEC 2011-R17 -- 2011 QF23, 2011 QE23, 2011 QC14, 2011 PS, 2011 PE2, 2011 MX2, 2007 LV19, 2005 JB
I74Baxter Garden Obs., 1 in MPEC 2011-R17 -- 2011 QF23
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-R17 -- 2002 QE7
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPEC 2011-R17 -- 2011 QY39, 2011 QY37, 2011 QS49, 2011 QE38, 2011 QD50, 2011 QD48, 2011 EZ78, 2007 SP6, 2007 PH25, 2006 PW, 2001 QP181, 1991 TF3
157Frasso Sabino Obs. in Italy, 4 in MPEC 2011-R17 -- 2011 QF23, 2011 QC14, 2011 PS, 2011 MO4
196Homburg-Erbach Obs. in Germany, 1 in MPEC 2011-R17 -- 2011 OV4
046Klet Obs. in the Czech Republic, 3 in MPEC 2011-R17 -- 2011 QY39, 2011 QF23, 2011 OQ5
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-R17 -- 2011 AG5
474Mt. John Obs. in New Zealand, 9 in MPECs 2011-R17 & 2011-R18 -- 2011 QY39, 2011 QY37, 2011 QF48, 2011 QE48, 2011 QE2, 2011 QD50, 2011 QD48, 2011 QC46, 2006 FY35
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-R17 -- 2011 QD50
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2011-R17 -- 2011 QF48, 2011 QD50, 169675
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2011-R17 -- 2011 OP24, 2010 LM68, 2003 SS84
A98Taurus-1 Obs. in Belarus, 1 in MPEC 2011-R17 -- 2011 OV4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 September '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 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 QF48JPL Sentry15192067-208222.1e-07-6.66-6.830JPL: "Analysis based on 36 observations spanning 3.9519 days (2011-Aug-30.7015 to 2011-Sep-03.65342)." Diameter approximately 0.030 km. from mean, weighted H=25.3.
2011 QD48JPL Sentry15192043-2111511.4e-07-3.32-3.820JPL: "Analysis based on 38 observations spanning 3.9707 days (2011-Aug-30.5432 to 2011-Sep-03.51389)." Diameter approximately 0.860 km. from mean, weighted H=18.0.
NEODyS15192039-2090203.05e-08-3.99-4.520NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2011-08-30.544 to 2011-09-03.515."
2011 PE2NEODyS15192027-209041.57e-04-2.43-2.430NEODyS: "Based on 78 optical observations (of which 0 are rejected as outliers) from 2011-08-08.065 to 2011-09-03.333."
2011 AG5NEODyS15192040-2057101.69e-03-1.10-1.11NEODyS: "Based on 190 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-09-01.313."

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 4 September '11

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

1700Grabbed MPEC 2011-R18 - 2006 FY35 - see above
1519Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that NEODyS has updated its 2011 PE2 risk assessment - see above
Noted that JPL Sentry has updated its 2011 QD48 risk assessment - see above
Noted that NEODyS has updated its 2011 QD48 risk assessment - see above
Noted that JPL Sentry has updated its 2011 QF48 risk assessment - see above
Grabbed MPEC 2011-R17 - Daily Orbit Update - see above