Contents  on 29 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 29 September '12

Three objects reported inside ten LD

There are three visitors reported passing inside ten lunar distances (LD) of Earth today. Risk-listed 2012 SY49 is outbound from 4.29 to 7.44 LD and 2012 SL50 from 5.35 to 7.77 LD, and 2012 SJ58 is calculated with some uncertainty to come within the ten-LD "bubble," moving from 11.7 to 9.7 LD.

Coming our way next, 2010 JK1 arrives inside ten LD on November 22nd.

This report was generated at 1506 UTC. [Not noted here this day, but follow-up for distant 2003 UV11 was reported the day's DOU MPEC.]

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 29 September '12

The MPC's NEO Confirmation Page has 7 listings

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

New MPECs  on 29 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-S86 - "15:32 UT" - 2012 SA59

<< DOU on 29 Sept. '12 >>  MPEC 2012-S85 - "06:03 UT" - Daily Orbit Update

Observers  on 29 September '12

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2012-S85 -- 2012 JS11
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2012-S86 -- 2012 SA59
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-S85 -- 330825
703Catalina Sky Survey in Arizona, 1 in MPEC 2012-S86 -- 2012 SA59
J95Great Shefford Obs. in England, 1 in MPEC 2012-S86 -- 2012 SA59
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2012-S86 -- 2012 SA59
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 10 in MPEC 2012-S85 -- 2010 OD101, 2010 NG3, 2010 LU134, 2010 LR68, 2010 LO97, 2010 LM14, 2010 JL33, 2010 EH20, 2010 CG18, 136874
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2012-S85 -- 2003 UV11, 308043
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2012-S86 -- 2012 SA59
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2012-S85 -- 2012 QF49
J41Raheny Obs. in Ireland, 1 in MPEC 2012-S86 -- 2012 SA59
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-S86 -- 2012 SA59 Canary Islands Obs. in the Canary Islands, 1 in MPEC 2012-S85 -- 2012 QE50
A92Urseanu Obs. in Romania, 2 in MPEC 2012-S85 -- 214869, 5646
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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 SG58NEODyS15052060-206013.13e-08-6.49-6.490NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2012-09-26.260 to 2012-09-28.115."

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 29 September '12

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

1630Grabbed MPEC 2012-S86 - 2012 SA59 - see above
1506Generated Traffic Report
1505Noted that NEODyS has posted 2012 SG58 as an impact risk - see above
Grabbed MPEC 2012-S85 - Daily Orbit Update - see above