Contents  on 6 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 6 December '12

No objects reported inside ten LD

No asteroids are reported to be traveling within ten lunar distances (LD) of our planet today. Returning 2009 BS5, a difficult target not yet reported observed, is calculated with some uncertainty to come inside ten LD tomorrow.

This report was generated at 1727 UTC with observations of departed 2012 XP2 and 2012 XC in today's DOU 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.

NEOCP Activity  on 6 December '12

The MPC's NEO Confirmation Page has 17 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seventeen objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 29 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 6 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-X23 - "16:53 UT" - 2012 XZ6


MPEC 2012-X22 - "14:47 UT" - 2012 XY6


<< DOU on 6 Dec. '12 >>  MPEC 2012-X21 - "06:02 UT" - Daily Orbit Update


MPEC 2012-X20 - "00:21 UT" - 2012 XR2

Observers  on 6 December '12

A total of 40 observers appear in today's MPECs.

CodeObserver / observatory
169Airali Obs. in Italy, 2 in MPEC 2012-X21 -- 330825, 5646
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2012-X23 -- 2012 XZ6
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-X23 -- 2012 XZ6
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPECs 2012-X20, 2012-X21, 2012-X22 & 2012-X23 -- 2012 XZ6, 2012 XY6, 2012 XR2, 2012 XB, 2012 WB25, 2012 VN82, 2012 VM82, 2012 VM76, 2012 UU136, 2012 TT145, 2012 TQ78, 2012 TM139, 329340
C77Bernezzo Obs. in Italy, 1 in MPEC 2012-X23 -- 2012 XZ6
C12Berta Obs. in Spain, 1 in MPEC 2012-X23 -- 2012 XZ6
B75Betelgeuse Station in Italy, 1 in MPEC 2012-X23 -- 2012 XZ6
I58Betera Obs., 1 in MPEC 2012-X23 -- 2012 XZ6
B88Bigmuskie Obs. in Italy, 1 in MPEC 2012-X21 -- 2012 VJ82
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2012-X21 & 2012-X23 -- 2012 XZ6, 2012 XA, 2012 VP76, 2012 VF37, 2012 HY33, 333358, 276397, 12538
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPECs 2012-X21 & 2012-X23 -- 2012 XZ6, 2012 WL4, 2012 VC5, 2012 TS, 2012 RG3, 2012 BC20, 2003 GW, 54686, 285263, 212359, 115052
958Dax Obs. in France, 1 in MPEC 2012-X23 -- 2012 XZ6
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 4 in MPECs 2012-X21, 2012-X22 & 2012-X23 -- 2012 XZ6, 2012 XY6, 2012 WB25, 2012 VZ25
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-X23 -- 2012 XZ6
E102Ernesto Guido in Italy via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-X23 -- 2012 XZ6
J95Great Shefford Obs. in England, 2 in MPECs 2012-X22 & 2012-X23 -- 2012 XZ6, 2012 XY6
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-X22 -- 2012 XY6
B15Inastars Obs. in Germany, 1 in MPEC 2012-X23 -- 2012 XZ6
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2012-X23 -- 2012 XZ6
W87LCOGT Cerro Tololo C in Chile, 2 in MPEC 2012-X21 -- 2012 XP2, 2010 XL56
704LINEAR in New Mexico, 8 in MPEC 2012-X21 -- 2012 XN2, 2001 YM2, 285540, 219071, 12538, 6455, 3908, 1620
213Montcabre Obs. in Spain, 1 in MPEC 2012-X23 -- 2012 XZ6
C91Montevenere Obs., 1 in MPEC 2012-X23 -- 2012 XZ6
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2012-X20, 2012-X21 & 2012-X23 -- 2012 XZ6, 2012 XR2, 2012 XG, 2010 XL56, 2009 KT21, 277127, 136795
J93Mt. Tuffley Obs. in England, 4 in MPEC 2012-X21 -- 1994 XD, 345705, 5646, 4179
I89Nerpio Obs. in Italy, 1 in MPEC 2012-X23 -- 2012 XZ6
A24New Millennium Obs. in Italy, 2 in MPECs 2012-X22 & 2012-X23 -- 2012 XZ6, 2012 XY6
J69North Obs. in England, 1 in MPEC 2012-X21 -- 4179
C27Pallerols Obs. in Spain, 1 in MPEC 2012-X21 -- 2001 YM2
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2012-X21 -- 2003 UC20, 1994 XD
H06%Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-X23 -- 2012 XZ6
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPEC 2012-X21 -- 2012 XN2, 2009 WF106
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2012-X23 -- 2012 XZ6
H36Sandlot Obs. in Kansas, 2 in MPECs 2012-X20 & 2012-X22 -- 2012 XY6, 2012 XR2
204Schiaparelli Obs. in Italy, 7 in MPECs 2012-X21 & 2012-X22 -- 2012 XY6, 2012 XC, 2012 XB, 2008 UL90, 2007 YX1, 2002 NP1, 345705
J26Spaceguard Centre in Wales, 1 in MPEC 2012-X23 -- 2012 XZ6
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2012-X21 -- 2012 TM139, 2011 DL19, 2006 XA, 342866, 329338
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2012-X21 & 2012-X22 -- 2012 XY6, 2012 VK76, 2012 VE46, 2012 VC82, 2012 US9, 2012 UR136, 2012 TX78, 2012 SC22, 2011 WL2, 2009 EK1
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-X22 -- 2012 XY6
J08Zonalunar Obs. in Spain, 1 in MPEC 2012-X23 -- 2012 XZ6
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 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 Sentry17262062-209294.7e-09-5.66-6.300JPL: "Analysis based on 35 observations spanning 3.0540 days (2012-Dec-03.22097 to 2012-Dec-06.27497)." Diameter approximately 0.538 km. from mean, weighted H=19.0.
2011 WL2JPL Sentry1726R E M O V E DJPL: Risk listing removed at 0958 UTC.

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 6 December '12

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

1727Generated Traffic Report
1726Noted that JPL Sentry has removed 2011 WL2 as an impact risk - see above
Noted that JPL Sentry has posted 2012 XY6 as an impact risk - see above
Grabbed MPEC 2012-X21 - Daily Orbit Update - see above
Grabbed MPEC 2012-X22 - 2012 XY6 - see above
Grabbed MPEC 2012-X23 - 2012 XZ6 - see above
0037Grabbed MPEC 2012-X20 - 2012 XR2 - see above