Contents  on 1 September '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 1 September '11

The MPC's NEO Confirmation Page has 17 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seventeen objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 42 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 1 September '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-R05 - "18:01 UT" - 2011 QF48

MPEC 2011-R04 - "18:00 UT" - 2011 QE48

MPEC 2011-R03 - "17:57 UT" - 2011 QD48

<< DOU on 1 Sept. '11 >>  MPEC 2011-R02 - "06:03 UT" - Daily Orbit Update

MPEC 2011-R01 - "00:19 UT" - Comet C/2011 Q3 (McNaught)

Observers  on 1 September '11

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPEC 2011-R02 -- 2011 QY37, 2011 QG21
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2011-R01, 2011-R02, 2011-R03, 2011-R04 & 2011-R05 -- 2011 QF48, 2011 QE48, 2011 QE23, 2011 QD48, C/2011 Q3
C13Como Obs. in Italy, 1 in MPEC 2011-R02 -- 2011 QF23
B50Corner Obs. in Germany, 1 in MPEC 2011-R02 -- 1917
046Klet Obs. in the Czech Republic, 1 in MPEC 2011-R02 -- 2011 OC18
704LINEAR in New Mexico, 4 in MPEC 2011-R02 -- 2011 QT2, 2011 OC18, 283457, 277475
474Mt. John Obs. in New Zealand, 3 in MPECs 2011-R03, 2011-R04 & 2011-R05 -- 2011 QF48, 2011 QE48, 2011 QD48
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPEC 2011-R02 -- 2011 OQ5, 2011 OJ10, 2011 GA55, 2008 QF, 2006 SU49, 2005 TR15, 190208, 106589
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPECs 2011-R03 & 2011-R04 -- 2011 QE48, 2011 QD48
461SZTE Asteroid Program in Hungary, 1 in MPEC 2011-R02 -- 138524
I73Salvia Obs., 1 in MPEC 2011-R02 -- 1917
204Schiaparelli Obs. in Italy, 11 in MPEC 2011-R02 -- 2011 QS2, 2011 QG21, 2011 QF23, 2011 QE23, 2011 QE14, 2011 PW6, 2011 PT1, 2011 PS, 2008 SR7, 2001 SO263, 1984 QY1
E12Siding Spring Survey (SSS) in New South Wales, 8 in MPECs 2011-R01, 2011-R02, 2011-R03, 2011-R04 & 2011-R05 -- 2011 QT2, 2011 QJ21, 2011 QF48, 2011 QE48, 2011 QD48, C/2011 Q3, 26760, 4953
645Sloan Digital Sky Survey (SDSS) in New Mexico, 5 in MPEC 2011-R02 -- 2007 LQ19, 2007 LE, 2007 GS3, 2004 UE, 2001 VB76
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2011-R02 -- 2011 PU1, 2011 PE2
A98Taurus-1 Obs. in Belarus, 2 in MPEC 2011-R02 -- 2011 OV4, 2011 GA55
A48Verona Obs. in Italy, 5 in MPEC 2011-R02 -- 2011 QS2, 2011 QF23, 2011 OV4, 2011 GA55, 2008 RJ1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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.





Notes for Today's Latest Risk Assessments
2011 QF48JPL Sentry1953206711.3e-07-6.91-6.910JPL: "Analysis based on 24 observations spanning 1.9493 days (2011-Aug-30.7015 to 2011-Sep-01.65084)." Diameter approximately 0.028 km. from mean, weighted H=25.4.
2011 QD48JPL Sentry21482014-2111691.5e-07-2.46-2.500JPL: "Analysis based on 26 observations spanning 2.0614 days (2011-Aug-30.5432 to 2011-Sep-01.60463)." Diameter approximately 0.908 km. from mean, weighted H=17.9.
2011 PE2JPL Sentry15322027-210351.3e-04-2.52-2.520JPL: "Analysis based on 71 observations spanning 23.424 days (2011-Aug-08.06387 to 2011-Aug-31.48799)." Diameter approximately 0.084 km. from mean, weighted H=23.0.
NEODyS15322027-209022.4e-05-3.24-3.240NEODyS: "Based on 71 optical observations (of which 0 are rejected as outliers) from 2011-08-08.065 to 2011-08-31.489."
2011 PU1JPL Sentry15322061-2100461.9e-04-4.07-4.480JPL: "Analysis based on 41 observations spanning 24.447 days (2011-Aug-06.9677 to 2011-Aug-31.41466)." Diameter approximately 0.032 km. from mean, weighted H=25.1.
NEODyS15322061-2090982.61e-04-3.92-4.310NEODyS: "Based on 41 optical observations (of which 1 are rejected as outliers) from 2011-08-06.968 to 2011-08-31.415."

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 1 September '11

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

2148Noted that JPL Sentry has posted 2011 QD48 as an impact risk - see above
1953Noted that JPL Sentry has posted 2011 QF48 as an impact risk - see above
1803Grabbed MPEC 2011-R03 - 2011 QD48 - see above
Grabbed MPEC 2011-R04 - 2011 QE48 - see above
Grabbed MPEC 2011-R05 - 2011 QF48 - see above
1532Noted 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-R02 - Daily Orbit Update - see above
0037Grabbed MPEC 2011-R01 - Comet C/2011 Q3 (McNaught) - see above