Contents  on 4 December '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 December '12

No objects reported inside ten LD

No asteroids are reported to be inside ten lunar distances (LD) of our planet today. Approaching next, 2009 BS5 arrives inside ten LD on December 7th.

This report was generated at 2057 UTC with two new discoveries, both already departed: 2012 XC (MPEC) and risk-listed 2012 XH (MPEC). Today's DOU MPEC reports observation of 2011 LT17 from November of last year, adding to its June 2011 discovery arc, recovery this past April, and precovery from December 2004.

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 December '12

The MPC's NEO Confirmation Page has 14 listings

When last checked at 2323 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fourteen objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of nineteen 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 4 December '12

Minor Planet Electronic Circulars

As of last check at 2323 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-X13 - "21:19 UT" - Comet P/2012 WX32 (Tenagra)

MPEC 2012-X12 - "18:03 UT" - 2012 XH

MPEC 2012-X11 - "18:00 UT" - 2012 XG

<< DOU on 4 Dec. '12 >>  MPEC 2012-X10 - "06:02 UT" - Daily Orbit Update

MPEC 2012-X09 - "02:49 UT" - 2012 XC

MPEC 2012-X08 - "02:31 UT" - 2005 VE7

Observers  on 4 December '12

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
169Airali Obs. in Italy, 1 in MPEC 2012-X10 -- 5646
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2012-X10 -- 2012 WQ10
703Catalina Sky Survey (CSS) in Arizona, 10 in MPEC 2012-X10 -- 2012 JR17, 2006 WR127, 2005 UC, 2001 YM2, 340048, 329275, 277127, 17511, 3838, 1864
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPEC 2012-X10 -- 2012 VY4, 2012 QP17, 2012 LL9, 2012 JT17, 2009 UW18, 2009 BE77, 2005 BC, 2005 AN19, 285990
448Desert Moon Obs. in New Mexico, 5 in MPEC 2012-X10 -- 2012 VJ6, 2010 XT45, 52761, 303262, 4587
J95Great Shefford Obs. in England, 5 in MPECs 2012-X08, 2012-X09, 2012-X10, 2012-X11 & 2012-X12 -- 2012 XH, 2012 XG, 2012 XC, 2012 XA, 2005 VE7
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2012-X10 -- 2012 PQ28
704LINEAR in New Mexico, 6 in MPEC 2012-X10 -- 99907, 87684, 338176, 6569, 5751, 4487
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-X10 -- 2011 LT17
118Modra Obs. in Slovakia, 1 in MPEC 2012-X10 -- 2012 XA
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2012-X09, 2012-X10, 2012-X11, 2012-X12 & 2012-X13 -- 2012 XH, 2012 XG, 2012 XC, P/2012 WX32, 2003 SL215, 256004, 220839, 19764, 8034
J93Mt. Tuffley Obs. in England, 2 in MPEC 2012-X10 -- 345705, 5646
A24New Millennium Obs. in Italy, 1 in MPEC 2012-X11 -- 2012 XG
H06=program code "=" via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-X13 -- P/2012 WX32
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-X13 -- P/2012 WX32
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-X10 -- 2009 DK46
291Spacewatch 1.8m telescope in Arizona, 28 in MPECs 2012-X10, 2012-X11, 2012-X12 & 2012-X13 -- 2012 XH, 2012 XG, P/2012 WX32, 2012 WQ10, 2012 WC25, 2012 WB25, 2012 VZ4, 2012 VZ36, 2012 VZ25, 2012 VY4, 2012 VO76, 2012 VO7, 2012 VO6, 2012 VN82, 2012 VL6, 2012 VJ6, 2012 VG6, 2012 VF5, 2012 VF26, 2012 VE46, 2012 VE37, 2012 VC82, 2012 VA5, 2012 UZ33, 2012 UU136, 2012 UB34, 2012 UA174, 2010 LR33
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-X13 -- P/2012 WX32
718Wiggins Obs. in Utah, 1 in MPEC 2012-X10 -- 2012 VF37
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2012-X10 -- 2012 VJ82, 2012 TA79, 2012 TA219
G28Wyncroft Obs., 1 in MPEC 2012-X10 -- 329338
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 December '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 XHJPL Sentry20332057-211238.6e-08-7.77-7.780JPL: "Analysis based on 16 observations spanning 1.2217 days (2012-Dec-03.17776 to 2012-Dec-04.39943)." Diameter approximately 0.024 km. from mean, weighted H=25.7.

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 December '12

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

2234Grabbed MPEC 2012-X13 - Comet P/2012 WX32 (Tenagra) - see above
2057Generated Traffic Report
2033Noted that JPL Sentry has posted 2012 XH as an impact risk - see above
1843Grabbed MPEC 2012-X12 - 2012 XH - see above
1803Grabbed MPEC 2012-X11 - 2012 XG - see above
1707Grabbed MPEC 2012-X10 - Daily Orbit Update - see above
0352Grabbed MPEC 2012-X08 - 2005 VE7 - see above
Grabbed MPEC 2012-X09 - 2012 XC - see above