Contents  on 30 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 30 August '11

The MPC's NEO Confirmation Page has 20 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 20 objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 29 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 30 August '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-Q54 - "17:51 UT" - Comet C/2011 Q2 (McNaught)


MPEC 2011-Q53 - "17:43 UT" - 2011 QE38


<< DOU on 30 Aug. '11 >>  MPEC 2011-Q52 - "06:03 UT" - Daily Orbit Update

Observers  on 30 August '11

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
432Boambee Obs. in New South Wales, 1 in MPEC 2011-Q52 -- 66959
E00Castlemaine Obs. in Victoria, 1 in MPEC 2011-Q54 -- C/2011 Q2
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2011-Q52, 2011-Q53 & 2011-Q54 -- 2011 QX8, 2011 QF23, 2011 QE38, C/2011 Q2
E94Gisborne Obs. in New Zealand, 1 in MPEC 2011-Q54 -- C/2011 Q2
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2011-Q54 -- C/2011 Q2
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2011-Q52 -- 2011 QF23, 2011 GA55
046Klet Obs. in the Czech Republic, 4 in MPEC 2011-Q52 -- 2011 QF23, 2011 QF14, 2011 OV4, 2011 OM5
J75La Sagra Obs. in Spain, 1 in MPEC 2011-Q53 -- 2011 QE38
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-Q52 -- 2011 AG5
474Mt. John Obs. in New Zealand, 5 in MPECs 2011-Q52, 2011-Q53 & 2011-Q54 -- 2011 QG9, 2011 QF23, 2011 QE38, C/2011 Q2, 1984 QY1
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2011-Q52 & 2011-Q53 -- 2011 QE38, 2011 EZ40, 2008 EB32, 162269
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 3 in MPEC 2011-Q52 -- 2011 OV4, 2011 OM5, 2008 SR7
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-Q54 -- C/2011 Q2
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2011-Q53 -- 2011 QE38
204Schiaparelli Obs. in Italy, 12 in MPECs 2011-Q52 & 2011-Q53 -- 2011 QG9, 2011 QF14, 2011 QE38, 2011 QC14, 2011 PF2, 2011 OV4, 2011 OQ5, 2011 OL51, 2011 NZ, 2011 MV1, 2011 CG2, 2002 XU66
E12Siding Spring Survey (SSS) in New South Wales, 6 in MPECs 2011-Q52 & 2011-Q54 -- 2011 QX8, 2011 QJ21, 2011 QE23, C/2011 Q2, 143678, 4341
645Sloan Digital Sky Survey (SDSS) in New Mexico, 7 in MPEC 2011-Q52 -- 2010 JU39, 2010 DJ56, 2009 SG2, 2009 SB, 2008 SH82, 2008 DG5, 2004 UL
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2011-Q52 & 2011-Q53 -- 2011 QG9, 2011 QE38, 2011 PX, 2011 PW6, 2011 PE2, 2011 OP24, 2011 OL51, 2011 OJ10, 2011 MK, 1991 TB2
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-Q53 -- 2011 QE38
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 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 Sentry15212027-210362.5e-04-2.23-2.230JPL: "Analysis based on 68 observations spanning 22.150 days (2011-Aug-08.06387 to 2011-Aug-30.21401)." Diameter approximately 0.084 km. from mean, weighted H=23.0.
NEODyS15212027-209041.21e-04-2.53-2.530NEODyS: "Based on 68 optical observations (of which 0 are rejected as outliers) from 2011-08-08.065 to 2011-08-30.215."
2011 AG5JPL Sentry17042040-204756.5e-04-1.51-1.511JPL: "Analysis based on 187 observations spanning 229.15 days (2011-Jan-08.2673 to 2011-Aug-25.42026)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
NEODyS17042040-204791.63e-03-1.12-1.121NEODyS: "Based on 187 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-08-25.421."

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 30 August '11

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

1837Grabbed MPEC 2011-Q53 - 2011 QE38 - see above
Grabbed MPEC 2011-Q54 - Comet C/2011 Q2 (McNaught) - see above
1704Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
1521Noted that JPL Sentry has updated its 2011 PE2 risk assessment - see above
Noted that NEODyS has updated its 2011 PE2 risk assessment - see above
Grabbed MPEC 2011-Q52 - Daily Orbit Update - see above