Contents  on 31 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 31 October '12

Four objects reported inside ten LD

There are four objects reported flying inside ten lunar distances (LD) of our planet today. Risk-listed 2012 UU169 is outbound from 4.85 to 7.03 LD and 2012 UK171 from 8.32 to 8.92 LD while 2012 UX136 is inbound from 6.46 to 5.41 LD and 2012 UL171 from 8.1 to 7.9 LD*,

Coming toward Earth next, 2012 UV136 arrives inside ten LD tomorrow, risk-listed 2012 UY68 arrives on November 7th, and radar target 2010 JK1 on November 22nd.

This report was updated at 2040 UTC with a new discovery, already departed 2012 UB174 (MPEC). Today's first traffic report was generated at 1503 UTC with follow-up in today's DOU MPEC for 2012 UX136 and 2012 UV136.

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. "LD*" indicates some passage uncertainty. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 31 October '12

The MPC's NEO Confirmation Page has 15 listings

When last checked at 2344 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of eighteen 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 31 October '12

Minor Planet Electronic Circulars

As of last check at 2344 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-U124 - "17:39 UT" - 2012 UB174

MPEC 2012-U123 - "16:31 UT" - 2012 UA174

<< DOU on 31 Oct. '12 >>  MPEC 2012-U122 - "06:07 UT" - Daily Orbit Update

Observers  on 31 October '12

Ten observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPECs 2012-U122, 2012-U123 & 2012-U124 -- 2012 UV136, 2012 UB174, 2012 UA174, 2012 TM139, 2012 PP28, 2009 BD2, 1999 VR6, 326732, 155334, 5660, 887
B75Betelgeuse Station in Italy, 1 in MPEC 2012-U122 -- 2012 SW20
448Desert Moon Obs. in New Mexico, 4 in MPEC 2012-U122 -- 2012 HZ33, 1999 TZ4, 214869, 112985
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-U122 -- 2012 UX136
J95Great Shefford Obs. in England, 1 in MPEC 2012-U122 -- 2012 UR158
B67Mirasteilas Obs. in Switzerland, 4 in MPEC 2012-U122 -- 2009 SB15, 2002 TY68, 5143, 3838
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2012-U123 & 2012-U124 -- 2012 UB174, 2012 UA174
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2012-U122 -- 2012 UR158, 2012 QF49, 2012 HJ1, 2008 HV4
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-U124 -- 2012 UB174
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-U124 -- 2012 UB174
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 October '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2344 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 UR158JPL Sentry1502203311.6e-08-4.82-4.820JPL: "Analysis based on 72 observations spanning 8.4683 days (2012-Oct-22.4752 to 2012-Oct-30.94346)." Diameter approximately 0.260 km. from mean, weighted H=20.6.

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 31 October '12

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

2040Updated Traffic Report
1915Grabbed MPEC 2012-U124 - 2012 UB174 - see above
1633Grabbed MPEC 2012-U123 - 2012 UA174 - see above
1502Noted that JPL Sentry has updated its 2012 UR158 risk assessment - see above
Grabbed MPEC 2012-U122 - Daily Orbit Update - see above