Contents  on 8 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 8 December '12

One object reported inside ten LD

One object is reported to be within ten lunar distances (LD) of Earth today. 2009 BS5 is calculated with some uncertainty to be inbound from 9.6 to 9.1 LD.

Coming to the neighborhood next, newly announced risk-listed 2012 XM16 arrives inside ten LD on December 13th.

This report was updated at 1702 UTC with observation of departed 2012 VB37 (doubling its previous 15-day arc) in today's DOU MPEC along with follow-up for three other departed objects: 2012 XP2 and risk-listed 2012 XH and 2012 WR10. Today's first traffic report was generated at 0143 UTC to note the discoveries announced late yesterday of 2012 XM16 (MPEC) and departed 2012 XL16 (MPEC).


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.

Radar Astrometry  on 8 December '12

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2131 UTC when the database was dated 8 Dec.

NEOCP Activity  on 8 December '12

The MPC's NEO Confirmation Page has 32 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 32 objects listed. Of these, 23 were "one nighters." So far The Tracking News has counted a total of 55 listings on the NEOCP today.

New MPECs  on 8 December '12

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2012-X34 - "13:31 UT" - 2012 XF17


MPEC 2012-X33 - "13:28 UT" - 2012 XE17


MPEC 2012-X32 - "13:25 UT" - 2012 XD17


<< DOU on 8 Dec. '12 >>  MPEC 2012-X31 - "06:02 UT" - Daily Orbit Update

Observers  on 8 December '12

A total of 29 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2012-X32 & 2012-X33 -- 2012 XE17, 2012 XD17
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-X33 -- 2012 XE17
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2012-X31, 2012-X33 & 2012-X34 -- 2012 XF17, 2012 XE17, 189552, 137199, 11054, 8034, 3360
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 13 in MPECs 2012-X31, 2012-X33 & 2012-X34 -- 2012 XZ6, 2012 XP2, 2012 XN2, 2012 XF17, 2012 XE17, 2012 XA, 2012 WL4, 2012 WK4, 2009 SC15, 1999 HV1, 85990, 313809, 140039
I51Clinton Obs., 1 in MPEC 2012-X31 -- 3360
448Desert Moon Obs. in New Mexico, 1 in MPEC 2012-X33 -- 2012 XE17
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPECs 2012-X31 & 2012-X33 -- 2012 XZ6, 2012 XE17
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-X33 -- 2012 XE17
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 4179
J95Great Shefford Obs. in England, 2 in MPECs 2012-X32 & 2012-X33 -- 2012 XE17, 2012 XD17
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2012-X33 -- 2012 XE17
B15Inastars Obs. in Germany, 1 in MPEC 2012-X33 -- 2012 XE17
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2012-X33 -- 2012 XE17
704LINEAR in New Mexico, 4 in MPECs 2012-X31 & 2012-X33 -- 2012 XE17, 2008 XE2, 2000 WL63, 3360
C41MASTER-II Obs. Kislovodsk in Russia, 1 in MPEC 2012-X31 -- 11405
188Majdanak Obs. in Uzbekistan, 1 in MPEC 2012-X31 -- 99942
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2012-X31, 2012-X32, 2012-X33 & 2012-X34 -- 2012 XF17, 2012 XE17, 2012 XD17, 85490, 4486
A24New Millennium Obs. in Italy, 1 in MPEC 2012-X33 -- 2012 XE17
557Ondrejov Obs. in the Czech Republic, 2 in MPEC 2012-X31 -- 2003 UC20, 162004
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2012-X31 -- 2006 WN1
C27Pallerols Obs. in Spain, 3 in MPEC 2012-X31 -- 2012 VF37, 2001 YM2, 4179
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPEC 2012-X31 -- 2012 RX16, 2012 JS11, 2009 WC26, 2008 SS251, 2005 AY28, 333888, 333578, 329338, 141354, 112985, 5143, 5131
461SZTE Asteroid Program in Hungary, 1 in MPEC 2012-X33 -- 2012 XE17
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2012-X33 & 2012-X34 -- 2012 XF17, 2012 XE17
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-X32 -- 2012 XD17
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2012-X31 & 2012-X34 -- 2012 XF17, 4486
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2012-X31 & 2012-X34 -- 2012 XY6, 2012 XH, 2012 XF17, 2012 WR10, 2012 VF37, 2012 VB37, 2012 VA5, 2012 UE34, 2011 BK24, 2008 XM, 2006 BQ6
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-X33 -- 2012 XE17
I42Westport Obs. in Massachusetts, 2 in MPEC 2012-X31 -- 2012 TJ146, 2012 TA219
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 December '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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2012 XY6JPL Sentry1700R E M O V E DJPL: Risk listing removed at 0949 UTC.
2012 XHJPL Sentry1700R E M O V E DJPL: Risk listing removed at 0959 UTC.
2012 WR10JPL Sentry1700208714.9e-07-8.42-8.420JPL: "Analysis based on 37 observations spanning 15.205 days (2012-Nov-22.21759 to 2012-Dec-07.42265)." Diameter approximately 0.007 km. from mean, weighted H=28.5.
NEODyS17002081-208735.76e-07-8.34-8.480NEODyS: "Based on 37 optical observations (of which 1 are rejected as outliers) from 2012-11-22.218 to 2012-12-07.423."
2012 UE34JPL Sentry17002095-211192.7e-06-5.09-5.540JPL: "Analysis based on 43 observations spanning 50.814 days (2012-Oct-18.393522 to 2012-Dec-08.20732)." Diameter approximately 0.081 km. from mean, weighted H=23.1.
NEODyS17002092-209845.37e-07-5.77-5.960NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2012-10-18.394 to 2012-12-08.208."

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 8 December '12

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

2131Noted Radar Astrometry database update - see above
1702Updated Traffic Report
1700Noted that JPL Sentry has updated its 2012 UE34 risk assessment - see above
Noted that NEODyS has reposted 2012 UE34 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 WR10 risk assessment - see above
Noted that NEODyS has updated its 2012 WR10 risk assessment - see above
Noted that JPL Sentry has removed 2012 XH as an impact risk - see above
Noted that JPL Sentry has removed 2012 XY6 as an impact risk - see above
Grabbed MPEC 2012-X31 - Daily Orbit Update - see above
Grabbed MPEC 2012-X32 - 2012 XD17 - see above
Grabbed MPEC 2012-X33 - 2012 XE17 - see above
Grabbed MPEC 2012-X34 - 2012 XF17 - see above