Contents  on 4 October '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 4 October '12

One object reported inside ten LD

There is one asteroid reported moving inside ten lunar distances (LD) of our planet today. 2012 SJ58 is calculated with some uncertainty to be outbound from 6.2 to 7.3 LD. Next known coming to the neighborhood is 2010 JK1, which arrives inside ten LD on November 22nd.

This report was generated at 1619 UTC.

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 4 October '12

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. All of these 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 4 October '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 4 Oct. '12 >>  MPEC 2012-T09 - "06:03 UT" - Daily Orbit Update

Observers  on 4 October '12

Eleven observers appear in today's MPEC.

CodeObserver / observatory
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPEC 2012-T09 -- 2012 SY2, 2012 RS16, 2010 LR33, 2009 SB170
448Desert Moon Obs. in New Mexico, 4 in MPEC 2012-T09 -- 2012 ST9, 2012 KK18, 265962, 232368
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-T09 -- 2012 QO10
J95Great Shefford Obs. in England, 1 in MPEC 2012-T09 -- 2012 SG58
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-T09 -- 2012 QG8
A24New Millennium Obs. in Italy, 2 in MPEC 2012-T09 -- 333889, 4487
716Palmer Divide Obs. in Colorado, 1 in MPEC 2012-T09 -- 330825
H23Pear Tree Obs. in Florida, 1 in MPEC 2012-T09 -- 329520
H36Sandlot Obs. in Kansas, 5 in MPEC 2012-T09 -- 2012 SQ56, 2012 SK50, 2012 SG58, 2004 RX10, 330825
C24Seveso Obs., 2 in MPEC 2012-T09 -- 2012 QE50, 214869
954Teide Obs. in the Canary Islands, 1 in MPEC 2012-T09 -- 330825
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 October '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 SG58NEODyS16152060-206011.05e-08-6.90-6.90NEODyS: "Based on 35 optical observations (of which 2 are rejected as outliers) from 2012-09-26.260 to 2012-10-04.131."

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 4 October '12

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

1619Generated Traffic Report
1615Noted that NEODyS has updated its 2012 SG58 risk assessment - see above
Grabbed MPEC 2012-T09 - Daily Orbit Update - see above
1614Noted that the NEOCP has become active