Contents  on 27 August '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 27 August '11

The MPC's NEO Confirmation Page has 12 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had twelve objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of 23 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 27 August '11

Minor Planet Electronic Circulars

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

MPEC 2011-Q42 - "15:28 UT" - 2008 WN2

MPEC 2011-Q41 - "13:59 UT" - 2011 QF23

MPEC 2011-Q40 - "13:57 UT" - 2011 QE23

MPEC 2011-Q39 - "13:55 UT" - 2011 QD23

<< DOU on 27 Aug. '11 >>  MPEC 2011-Q38 - "06:03 UT" - Daily Orbit Update

Observers  on 27 August '11

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
A50Andrushivka Obs. in the Ukraine, 1 in MPEC 2011-Q38 -- 2008 VH
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2011-Q39, 2011-Q41 & 2011-Q42 -- 2011 QF23, 2011 QD23, 2008 WN2
432Boambee Obs. in New South Wales, 3 in MPEC 2011-Q38 -- 169675, 7889, 1866
160Castelmartini Obs. in Italy, 3 in MPEC 2011-Q38 -- 2011 PF2, 2011 OM5, 2011 JP29
A77Chante-Perdrix Obs. in France, 1 in MPEC 2011-Q38 -- 2011 OQ5
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2011-Q38 -- 1917
157Frasso Sabino Obs. in Italy, 4 in MPEC 2011-Q38 -- 2011 QG9, 2011 OM5, 2008 EK1, 2004 SX
J95Great Shefford Obs. in England, 1 in MPEC 2011-Q39 -- 2011 QD23
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2011-Q39 -- 2011 QD23
704LINEAR in New Mexico, 5 in MPECs 2011-Q38 & 2011-Q41 -- 2011 QF23, 2011 OQ5, 2008 VH, 2008 RJ1, 7341
474Mt. John Obs. in New Zealand, 1 in MPEC 2011-Q40 -- 2011 QE23
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2011-Q38 -- 2011 GA55, 5731
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2011-Q38 -- 2011 PF2, 2011 OV4, 2011 OQ5, 2011 GA55, 2008 SR7, 1917
H06%Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-Q41 -- 2011 QF23
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 2 in MPECs 2011-Q39 & 2011-Q41 -- 2011 QF23, 2011 QD23
461SZTE Asteroid Program in Hungary, 1 in MPEC 2011-Q38 -- 2004 SX
H36Sandlot Obs. in Kansas, 2 in MPECs 2011-Q39 & 2011-Q41 -- 2011 QF23, 2011 QD23
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPECs 2011-Q38 & 2011-Q40 -- 2011 QX8, 2011 QJ21, 2011 QE23, 2004 FF29
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-Q38 -- 143678
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2011-Q38 -- 2011 QF14, 2011 PU1, 2011 OR15, 2002 TR190, 2001 TC45, 7025
A78Stia Obs. in Italy, 4 in MPEC 2011-Q38 -- 2011 QG9, 2011 PF2, 2011 GA55, 2008 SR7
G56Walnut Creek Obs. in northern California, 2 in MPEC 2011-Q38 -- 2008 TR10, 2008 EK1
I13Washington D.C. Obs. in Washington, D.C., 1 in MPEC 2011-Q38 -- 1917
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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.





Notes for Today's Latest Risk Assessments
2011 QF14NEODyS1723R E M O V E D-
JPL Sentry1723R E M O V E DJPL: Risk listing removed at 0955 UTC.
2011 PU1JPL Sentry17232061-2107722.2e-04-4.00-4.500JPL: "Analysis based on 35 observations spanning 19.477 days (2011-Aug-06.9677 to 2011-Aug-26.44468)." Diameter approximately 0.032 km. from mean, weighted H=25.1.
NEODyS17232061-20901102.76e-04-3.89-4.40NEODyS: "Based on 35 optical observations (of which 1 are rejected as outliers) from 2011-08-06.968 to 2011-08-26.445."

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 27 August '11

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

1723Noted that JPL Sentry has updated its 2011 PU1 risk assessment - see above
Noted that NEODyS has updated its 2011 PU1 risk assessment - see above
Noted that JPL Sentry has removed 2011 QF14 as an impact risk - see above
Noted that NEODyS has removed 2011 QF14 as an impact risk - see above
Grabbed MPEC 2011-Q38 - Daily Orbit Update - see above
Grabbed MPEC 2011-Q39 - 2011 QD23 - see above
Grabbed MPEC 2011-Q40 - 2011 QE23 - see above
Grabbed MPEC 2011-Q41 - 2011 QF23 - see above
Grabbed MPEC 2011-Q42 - 2008 WN2 - see above