Contents  on 30 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 30 October '12

Five objects reported inside ten LD

Five asteroids are reported to be within ten lunar distances (LD) of our planet today. Risk-listed 2012 UU169 exits Earth's Hill sphere, moving from 3.24 to 4.85 LD. Further away, 2012 UX136 is inbound from 7.6 to 6.5 LD* and 2012 UL171 from 8.5 to 8.1 LD*, while 2012 UK171 is outbound from 7.85 to 8.32 LD and 2012 UW9 exits ten LD, passing from 9.6 to 10.3 LD*.

Coming to the neighborhood next, 2012 UV136 arrives inside ten LD on November 1st, risk-listed 2012 UY68 arrives on November 7th, and radar target 2010 JK1 on November 22nd.

This report was generated at 1629 UTC with follow-up in today's DOU MPEC for 2012 UK171, 2012 UX136, 2012 UV136, and departed 2012 UU9.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. 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 30 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. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 25 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 30 October '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.

<< DOU on 30 Oct. '12 >>  MPEC 2012-U121 - "06:06 UT" - Daily Orbit Update

MPEC 2012-U120 - "02:57 UT" - 2012 FK35

Observers  on 30 October '12

Ten observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPEC 2012-U121 -- 2012 US136, 2012 TZ52, 2012 TP274, 2012 TO231, 2012 QQ50, 2012 QO10, 2012 QB17, 326732, 276397, 199145, 138847, 5836, 5587, 4947
B88Bigmuskie Obs. in Italy, 2 in MPEC 2012-U121 -- 2012 US136, 214869
448Desert Moon Obs. in New Mexico, 10 in MPEC 2012-U121 -- 2012 UX27, 2012 TZ52, 2012 TO231, 2012 TK123, 2012 LU7, 331990, 326291, 277127, 6569, 4587
J95Great Shefford Obs. in England, 1 in MPEC 2012-U121 -- 2012 UK171
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-U121 -- 2012 TT78
A24New Millennium Obs. in Italy, 19 in MPEC 2012-U121 -- 2012 SA59, 2012 QF49, 2012 QB17, 2012 JS11, 2009 SB15, 2008 XE2, 2005 SH19, 99907, 333358, 330825, 277127, 219071, 18882, 17182, 162911, 105140, 5646, 4947, 3200
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2012-U121 -- 2012 UX136, 329614, 11405, 11284
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2012-U121 -- 2012 US136, 2012 UR158, 2012 QF49, 2002 TY68, 2002 TR190
204Schiaparelli Obs. in Italy, 19 in MPECs 2012-U120 & 2012-U121 -- 2012 UX68, 2012 UV136, 2012 UU9, 2012 UG, 2012 UD, 2012 TJ146, 2012 SQ56, 2012 SB22, 2012 SA59, 2012 RV16, 2012 RQ16, 2012 HY1, 2012 FK35, 2008 HV4, 2007 TR65, 2007 TF68, 2005 SH19, 2002 TR190, 329338
J84South Obs. in England, 1 in MPEC 2012-U121 -- 2012 UK171
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 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 UR158JPL Sentry16282033-206633.5e-07-3.45-3.450JPL: "Analysis based on 60 observations spanning 6.7913 days (2012-Oct-22.4752 to 2012-Oct-29.26652)." Diameter approximately 0.270 km. from mean, weighted H=20.5.
NEODyS1628R E M O V E D-

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 30 October '12

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

1629Generated Traffic Report
1628Noted that JPL Sentry has updated its 2012 UR158 risk assessment - see above
Noted that NEODyS has removed 2012 UR158 as an impact risk - see above
Grabbed MPEC 2012-U121 - Daily Orbit Update - see above
0434Grabbed MPEC 2012-U120 - 2012 FK35 - see above