Contents  on 5 December '13

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 5 December '13

No objects reported inside ten LD

There are no objects reported inside ten lunar distances (LD) of Earth today. The next known to be approaching is returning 2011 YD29, which, from a short observation arc one year ago, is calculated with major uncertainty to come inside ten LD on December 23rd.

This report was generated at 1836 UTC with follow-up in today's DOU MPEC for departed radar target 2013 NJ. We also note radar observation of departed 2001 AV43 posted late yesterday.



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 5 December '13

The MPC's NEO Confirmation Page has 33 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 33 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 42 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 5 December '13

Minor Planet Electronic Circulars

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


MPEC 2013-X27 - "23:09 UT" - 2013 WM106


MPEC 2013-X26 - "18:07 UT" - Comet C/2013 W2 (Panstarrs)


<< DOU on 5 Dec. '13 >>  MPEC 2013-X25 - "17:32 UT" - Daily Orbit Update

Observers  on 5 December '13

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2013-X26 -- C/2013 W2
B75Betelgeuse Station in Italy, 1 in MPEC 2013-X25 -- 52760
300Bisei Spaceguard Center in Japan, 1 in MPEC 2013-X25 -- 3200
I99Blanquita Obs. in Spain, 1 in MPEC 2013-X25 -- 2010 CL19
160Castelmartini Obs. in Italy, 6 in MPEC 2013-X25 -- 2013 VD13, 2010 XZ67, 2010 CL19, 340666, 215188, 138095
G58Chabot Obs. in northern California, 3 in MPEC 2013-X25 -- 2013 WT45, 2013 WS43, 2013 WR67
958Dax Obs. in France, 1 in MPEC 2013-X26 -- C/2013 W2
151Eschenberg Obs. in Switzerland, 2 in MPEC 2013-X25 -- 2013 TB80, 2010 CL19
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-X26 -- C/2013 W2
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2013-X26 -- C/2013 W2
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-X25 -- 2013 VQ11
568=program code "=" on Mauna Kea in Hawaii, 1 in MPEC 2013-X27 -- 2013 WM106
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2013-X26 -- C/2013 W2
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2013-X25 -- 2013 TL117, 2010 CL19
C91Montevenere Obs., 1 in MPEC 2013-X25 -- 16834
A24New Millennium Obs. in Italy, 7 in MPEC 2013-X25 -- 2010 XZ67, 251346, 21088, 162566, 138095, 12711, 9950
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPECs 2013-X25, 2013-X26 & 2013-X27 -- 2013 WM106, C/2013 W2, 96315, 90075, 52760, 377732, 35107, 313538, 177651, 154276, 8201, 4197, 1580
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2013-X25 -- 52760, 377097, 10165, 9950
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-X25 -- 275545
589Santa Lucia Stroncone Obs. in Italy, 1 in MPEC 2013-X25 -- 2013 NJ
204Schiaparelli Obs. in Italy, 9 in MPEC 2013-X25 -- 2013 WN67, 2013 WH, 2013 UF5, 2013 TR5, 2013 TG4, 2013 TD4, 2013 TB80, 2013 NJ, 2011 UW158
G404Don Cranford, Jr. in North Carolina via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPEC 2013-X25 -- 2013 WT45, 2013 VC10
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-X26 -- C/2013 W2
A78Stia Obs. in Italy, 2 in MPEC 2013-X25 -- 2013 UR3, 85818
A48Verona Obs. in Italy, 2 in MPEC 2013-X25 -- 2011 CQ4, 2010 SL13
I42Westport Obs. in Massachusetts, 4 in MPEC 2013-X25 -- 2013 VD13, 2013 UR3, 2013 TL117, 2013 TB80
I15Wishing Star Obs. in Rhode Island, 1 in MPEC 2013-X25 -- 2009 WE253
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-X26 -- C/2013 W2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 December '13

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
2013 WR67JPL Sentry2008202117.2e-06-2.60-2.600JPL: "Analysis based on 23 observations spanning 5.9329 days (2013-Nov-29.30924 to 2013-Dec-05.24215)." Diameter approximately 0.150 km. from mean, weighted H=21.8.
NEODyS19302021-202117.35e-06-2.59-2.590NEODyS #2 for the day: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2013-11-29.310 to 2013-12-05.243."
2013 WX44NEODyS15552071-207112.8e-07-6.94-6.940NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2013-11-27.505 to 2013-12-03.538."

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 5 December '13

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

2359Grabbed MPEC 2013-X27 - 2013 WM106 - see above
2008Noted that JPL Sentry has updated its 2013 WR67 risk assessment - see above
1930Noted that NEODyS has updated its 2013 WR67 risk assessment - see above
1836Grabbed MPEC 2013-X26 - Comet C/2013 W2 (Panstarrs) - see above
Generated Traffic Report
1758Grabbed MPEC 2013-X25 - Daily Orbit Update - see above
1555Noted that NEODyS has updated its 2013 WR67 risk assessment - see above
Noted that NEODyS has updated its 2013 WX44 risk assessment - see above