Contents  on 13 August '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 13 August '11

Not active

The Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) was empty when checked at 2359 UTC, but earlier one listing was noted.

New MPECs  on 13 August '11

Minor Planet Electronic Circulars

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


MPEC 2011-P49 - "13:38 UT" - 2011 OK45


<< DOU on 13 Aug. '11 >>  MPEC 2011-P48 - "06:04 UT" - Daily Orbit Update

Observers  on 13 August '11

Seven observers appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 22 in MPEC 2011-P48 -- 2011 PU1, 2011 PU, 2011 PS, 2011 PO1, 2011 PE2, 2011 OY17, 2011 OW4, 2011 OV4, 2011 OQ5, 2011 OA, 2011 NY, 2011 MK, 2011 HP, 2011 GA55, 2009 QZ6, 2008 CM, 2006 SV134, 2005 XY, 2004 PX27, 2004 JO2, 2003 QC10, 2000 OM
300Bisei Spaceguard Center in Japan, 2 in MPEC 2011-P48 -- 2011 PO1, 2004 PX27
807,Ovidiu Vaduvescu via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-P48 -- 2011 KE15
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-P49 -- 2011 OK45
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2011-P49 -- 2011 OK45
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-P48 -- 2000 RD34
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2011-P48 -- 2011 JP29, 20086
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 August '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 PE2JPL Sentry15472027-205648.0e-05-2.81-2.860JPL: "Analysis based on 38 observations spanning 4.2321 days (2011-Aug-08.06387 to 2011-Aug-12.296012)." Diameter approximately 0.084 km. from mean, weighted H=23.0.
NEODyS15472027-209058.79e-05-2.78-2.840NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2011-08-08.065 to 2011-08-12.297."
2011 PU1JPL Sentry15472048-2084404.1e-04-3.76-3.990JPL: "Analysis based on 26 observations spanning 5.2349 days (2011-Aug-06.9677 to 2011-Aug-12.202649)." Diameter approximately 0.031 km. from mean, weighted H=25.2.
NEODyS15472057-2090954.59e-04-3.70-3.90NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2011-08-06.968 to 2011-08-12.203."
2011 KE15NEODyS1547R E M O V E D-
JPL Sentry1547R E M O V E DJPL: Risk listing removed at 0952 UTC.

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 13 August '11

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

1708Noted that the NEOCP has become empty
1547Noted that JPL Sentry has removed 2011 KE15 as an impact risk - see above
Noted that NEODyS has removed 2011 KE15 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 PE2 risk assessment - see above
Noted that NEODyS has updated its 2011 PE2 risk assessment - see above
Noted that JPL Sentry has updated its 2011 PU1 risk assessment - see above
Noted that NEODyS has updated its 2011 PU1 risk assessment - see above
Grabbed MPEC 2011-P48 - Daily Orbit Update - see above
Grabbed MPEC 2011-P49 - 2011 OK45 - see above
Noted that the NEOCP has become active