Contents  on 1 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 1 September '12

One object reported inside ten LD

One asteroid is reported flying within ten lunar distances (LD) of Earth today. 2012 QZ16 exits ten LD, passing from 8.45 to 10.42 LD.

On approach next, radar target 2012 QG42 arrives inside ten LD on September 11th.

This report was generated at 1620 UTC with follow-up in today's DOU MPEC for 2012 QG42.

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 1 September '12

The MPC's NEO Confirmation Page has 5 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five objects listed. Of these, two were "one nighters."

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 '12

Minor Planet Electronic Circulars

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

<< DOU on 1 Sept. '12 >>  MPEC 2012-R01 - "06:03 UT" - Daily Orbit Update

Observers  on 1 September '12

Eight observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 26 in MPEC 2012-R01 -- 2012 QP17, 2012 QO10, 2012 QG42, 2012 QF42, 2012 QE50, 2012 PP28, 2012 PP24, 2012 PG5, 2012 NP, 2012 LU7, 2012 LE11, 2009 BD2, 2006 OT9, 2006 DY, 2001 QG142, 2000 RN77, 2000 RH60, 333578, 330825, 276397, 217013, 214869, 105140, 10302, 5751, 4587
160Castelmartini Obs. in Italy, 1 in MPEC 2012-R01 -- 2012 LE11
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-R01 -- 2012 QG42
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-R01 -- 2012 QD8
I29Middlesex School Obs. in Massachusetts, 1 in MPEC 2012-R01 -- 2012 QG42
A24New Millennium Obs. in Italy, 34 in MPEC 2012-R01 -- 2012 PA, 2012 OO, 2012 OD1, 2012 NP, 2012 LE11, 2012 BZ76, 2012 BC20, 2010 OS22, 2010 OB101, 2009 AV, 2008 JZ30, 2006 DQ62, 2001 QG142, 88263, 333707, 333578, 333358, 331963, 329340, 304640, 249886, 217013, 20460, 162980, 153415, 138847, 108906, 105140, 8035, 4947, 4581, 4487, 3200, 1685
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2012-R01 -- 2002 TY68, 333358
204Schiaparelli Obs. in Italy, 5 in MPEC 2012-R01 -- 2012 QC8, 2012 PP28, 2009 AV, 2004 SB56, 2002 UA31
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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
2012 QD8JPL Sentry16012047-211174.6e-05-3.03-3.040JPL: "Analysis based on 36 observations spanning 10.909 days (2012-Aug-17.44424 to 2012-Aug-28.35303)." Diameter approximately 0.082 km. from mean, weighted H=23.1.
NEODyS16012039-209385.72e-05-2.93-2.940NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2012-08-17.445 to 2012-08-28.354."

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 '12

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

1620Generated Traffic Report
1601Noted that JPL Sentry has updated its 2012 QD8 risk assessment - see above
Noted that NEODyS has updated its 2012 QD8 risk assessment - see above
Grabbed MPEC 2012-R01 - Daily Orbit Update - see above