Contents  on 12 September '12

Asteroid/Comet Connection (A/CC) 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.

Traffic Report  on 12 September '12

One object reported inside ten LD

There is one asteroid reported flying inside ten lunar distances (LD) of Earth today. Radar target 2012 QG42 is inbound from 9.25 to 8.02 LD. Next up, 2010 JK1 arrives inside ten LD on November 22nd.

This report was generated at 1627 UTC with today's DOU MPEC reporting follow-up for 2012 QG42 and the doubling of departed 2012 PD20's observation arc to 27 days.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Object distances are interpreted by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 12 September '12

The MPC's NEO Confirmation Page has 6 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six objects listed. Of these, three were "one nighters." So far The Tracking News has counted a total of ten 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 12 September '12

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 2012-R27 - "16:31 UT" - 2008 EO6

<< DOU on 12 Sept. '12 >>  MPEC 2012-R26 - "06:02 UT" - Daily Orbit Update

Observers  on 12 September '12

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 20 in MPECs 2012-R26 & 2012-R27 -- 2012 RO1, 2012 RM2, 2012 QX17, 2012 QQ10, 2012 QJ2, 2012 QG49, 2012 QG42, 2012 QF42, 2012 QE50, 2012 QC18, 2012 PZ19, 2012 PS17, 2012 PP24, 2012 PD20, 2012 NN, 2008 EO6, 2007 LD, 2007 AT2, 29075, 141018
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2012-R26 -- 2012 QE50
621Bergisch Gladbach Obs. in Germany, 1 in MPEC 2012-R26 -- 178871
I99Blanquita Obs. in Spain, 1 in MPEC 2012-R26 -- 2012 QG42
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2012-R26 -- 2012 RL2, 2012 QH8, 2012 PQ28
I17Cupillari Obs. in Pennsylvania, 1 in MPEC 2012-R26 -- 2012 QG42
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-R26 -- 2012 RG3
D00ISON-Kislovodsk Obs., 1 in MPEC 2012-R26 -- 138847
704LINEAR in New Mexico, 1 in MPEC 2012-R26 -- 326732
I54MPC code I54, 1 in MPEC 2012-R26 -- 2012 QG42
711McDonald Obs. in Texas, 1 in MPEC 2012-R26 -- 2012 RG3
C47Nonndorf Obs. in Austria, 2 in MPEC 2012-R26 -- 2012 QG42, 2012 QE50
C23Olmen Obs. in Belgium, 1 in MPEC 2012-R26 -- 2012 QG42
C27Pallerols Obs. in Spain, 1 in MPEC 2012-R26 -- 2012 QG42
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 15 in MPEC 2012-R26 -- 2012 RM2, 2012 QY14, 2012 QX17, 2012 QP17, 2012 QO10, 2012 QJ2, 2012 QG42, 2012 QF42, 2012 QE50, 2012 QB17, 2012 PS17, 2012 PP24, 2012 BZ76, 2008 CZ21, 1994 EK
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2012-R26 -- 2012 QG42, 2009 DK46, 2009 BD2
J84South Obs. in England, 1 in MPEC 2012-R26 -- 2012 QG42
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2012-R26 -- 2012 QG42
I76Tesla Obs. in Spain, 2 in MPEC 2012-R26 -- 2012 QG42, 2012 QE50
A48Verona Obs. in Italy, 1 in MPEC 2012-R26 -- 2012 QG42
I42Westport Obs. in Massachusetts, 5 in MPEC 2012-R26 -- 2012 QY14, 2012 QO10, 2012 QG42, 2012 QB17, 333889
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 September '12

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 CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2008 EM68JPL Sentry05512013-21105664.8e-06-5.65-6.280JPL: "Analysis based on 11 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183)." Diameter approximately 0.010 km. from mean, weighted H=27.5.

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 12 September '12

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

1732Grabbed MPEC 2012-R27 - 2008 EO6 - see above
1627Generated Traffic Report
1626Grabbed MPEC 2012-R26 - Daily Orbit Update - see above
0551Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above