Contents  on 7 October '12

Asteroid/Comet Connection (A/CC) Resources:

  Note: The A/CC news pages will update only occasionally through early October 12th UTC.

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 7 October '12

Two objects reported inside ten LD

Two small asteroids are reported to be traveling inside ten lunar distances (LD) of Earth today. Risk-listed intruder 2012 TV passes through the Earth-Moon system during the day, moving in from 2.45 and out to 1.55 LD, reaching 0.66 LD at 1504 UT. And newly announced intruder 2012 TC4 is inbound from 7.75 to 6.28 LD.

Coming toward Earth next, 2010 JK1 arrives inside ten LD on November 22nd.

This report was updated at 1715 UTC with new discovery 2012 TC4 (MPEC). Today's first traffic report was generated at 1418 UTC with follow-up in today's DOU MPEC for 2012 TV and departed 2012 SR56, with distances updated at 1510 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 7 October '12

The MPC's NEO Confirmation Page has 135 listings

When last checked at 2322 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 135 objects listed. Of these, 101 were "one nighters." The Tracking News counted a total of 146 listings on the NEOCP on this day.

New MPECs  on 7 October '12

Minor Planet Electronic Circulars

There were two MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-T18 - "14:42 UT" - 2012 TC4

<< DOU on 7 Oct. '12 >>  MPEC 2012-T17 - "06:03 UT" - Daily Orbit Update

Observers  on 7 October '12

Sixteen observers appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2012-T17 -- 2012 SR56, 2012 SQ56, 2012 SK8, 2012 SK50, 2012 SA59, 2012 RX16, 2012 QF49, 2012 QF42, 2012 QE50, 2012 JR17
I56Beckman Obs. in Spain, 3 in MPEC 2012-T17 -- 330825, 144411, 3360
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-T17 -- 2012 TV
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2012-T17 & 2012-T18 -- 2012 TC4, 2012 RV16, 2012 LE11, 2007 TR65, 2007 RT19, 1998 SE36, 178871, 3288
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2012-T17 -- 2005 ST1
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 4 in MPEC 2012-T17 -- 2012 TV, 2012 TS, 2012 RV16, 2005 ST1
J95Great Shefford Obs. in England, 1 in MPEC 2012-T18 -- 2012 TC4
932McCarthy Obs. in Connecticut, 1 in MPEC 2012-T18 -- 2012 TC4
711McDonald Obs. in Texas, 2 in MPEC 2012-T17 -- 2012 TU, 2012 TS
900Moriyama Obs. in Japan, 1 in MPEC 2012-T18 -- 2012 TC4
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2012-T17 -- 2009 TB3, 144922
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPECs 2012-T17 & 2012-T18 -- 2012 TC4, 2012 SK50, 2012 RX16, 2008 TZ3, 2007 TR65, 2004 XN14, 171839, 12538
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-T18 -- 2012 TC4 Canary Islands Obs. in the Canary Islands, 3 in MPEC 2012-T17 -- 2012 TV, 2002 UA31, 329520
J84South Obs. in England, 1 in MPEC 2012-T18 -- 2012 TC4
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-T17 -- 1998 SE36
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 October '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2323 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 TVJPL Sentry14162070-210779.6e-06-5.10-5.120JPL: "Analysis based on 175 observations spanning 1.6081 days (2012-Oct-05.32361 to 2012-Oct-06.93169)." Diameter approximately 0.031 km. from mean, weighted H=25.2.
NEODyS14162070-2096141.39e-06-5.93-6.060NEODyS: "Based on 175 optical observations (of which 0 are rejected as outliers) from 2012-10-05.324 to 2012-10-06.932."

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 7 October '12

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

1715Updated Traffic Report
1524Grabbed MPEC 2012-T18 - 2012 TC4 - see above
1416Noted that JPL Sentry has updated its 2012 TV risk assessment - see above
Noted that NEODyS has posted 2012 TV as an impact risk - see above
Grabbed MPEC 2012-T17 - Daily Orbit Update - see above