Contents  on 2 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 2 December '13

Three objects reported inside ten LD

Three asteroids are reported flying within ten lunar distances (LD) of our planet today. 2013 WV43 is inbound from 9.75 to 9.48 LD while the other two exit the ten-LD reporting "bubble": radar target 2013 NJ travels from 9.28 to 10.76 LD and 2013 WY 9.68 to 10.37 LD.

This report was updated at 1821 UTC with observations in today's DOU MPEC of departed risk-listed objects 2013 WZ44 (first follow-up) and 2013 WX44 (astrometry from the discovery arc). Today's first traffic report was generated at 1607 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.

Radar Astrometry  on 2 December '13

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 2318 UTC when the database was dated 2 Dec.

NEOCP Activity  on 2 December '13

The MPC's NEO Confirmation Page has 23 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 23 objects listed. Of these, six were "one nighters." So far The Tracking News has counted a total of 39 listings on the NEOCP today.

New MPECs  on 2 December '13

Minor Planet Electronic Circulars

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


MPEC 2013-X20 - "20:15 UT" - 2013 WT67


MPEC 2013-X19 - "20:09 UT" - 2013 WS67


MPEC 2013-X18 - "20:03 UT" - 2013 WR67


MPEC 2013-X17 - "19:55 UT" - 2013 WQ67


MPEC 2013-X16 - "19:48 UT" - 2013 WP67


MPEC 2013-X15 - "19:41 UT" - 2013 WN67


<< DOU on 2 Dec. '13 >>  MPEC 2013-X14 - "17:32 UT" - Daily Orbit Update


MPEC 2013-X13 - "13:55 UT" - 2013 UR3


MPEC 2013-X12 - "13:48 UT" - 2009 SV171


MPEC 2013-X11 - "13:25 UT" - 1998 WP7 = 2013 WS45

Observers  on 2 December '13

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
981Armagh Obs. in Northern Ireland, 1 in MPEC 2013-X14 -- 2013 TV135
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2013-X14, 2013-X15, 2013-X17, 2013-X18 & 2013-X19 -- 2013 WS67, 2013 WR67, 2013 WQ67, 2013 WN67, 2013 UG10, 2010 KR10, 354182
300Bisei Spaceguard Center in Japan, 4 in MPECs 2013-X14 & 2013-X17 -- 2013 WQ67, 2013 OD4, 2013 BO76, 369452
160Castelmartini Obs. in Italy, 11 in MPECs 2013-X13 & 2013-X14 -- 2013 VD13, 2013 UR3, 2010 XZ67, 2010 CL19, 1997 WQ23, 377097, 376729, 360433, 215188, 138852, 138095
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 13 in MPECs 2013-X11, 2013-X14 & 2013-X17 -- 2013 WZ43, 2013 WX43, 2013 WW44, 2013 WU44, 2013 WT44, 2013 WS45, 2013 WQ67, 2013 WH, 2013 WC44, 2013 WB44, 2013 VF13, 2013 VD13, 2013 UQ4
Z81Estrella de Mar Obs., 2 in MPEC 2013-X14 -- 2013 NX23, 2003 YO1
Z62Forcarei Obs., 1 in MPEC 2013-X18 -- 2013 WR67
203GiaGa Obs. in Italy, 1 in MPEC 2013-X18 -- 2013 WR67
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2013 NJ
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2013-X14 -- 2013 TS4
K38M57 Obs., 1 in MPEC 2013-X13 -- 2013 UR3
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2013-X16 -- 2013 WP67
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2013-X12 & 2013-X14 -- 2013 TV135, 2009 SV171
B67Mirasteilas Obs. in Switzerland, 5 in MPEC 2013-X14 -- 2013 WU45, 2013 VY13, 2013 TL117, 2013 TB80, 2005 RQ6
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2013-X16 & 2013-X19 -- 2013 WS67, 2013 WP67
J93Mt. Tuffley Obs. in England, 2 in MPEC 2013-X14 -- 9950, 1627
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2013-X13 -- 2013 UR3
A13Naef Obs. in Switzerland, 2 in MPEC 2013-X14 -- 185851, 138205
C23Olmen Obs. in Belgium, 1 in MPEC 2013-X14 -- 2010 XZ67
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2013-X14 -- 2013 TL117
261&Rob Matson in southern California using the Palomar Digitized Sky Survey in southern California, 1 in MPEC 2013-X13 -- 2013 UR3
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2013-X14, 2013-X15, 2013-X17 & 2013-X18 -- 2013 WR67, 2013 WQ67, 2013 WN67, 2013 WH
D29Purple Mtn. Obs. Xuyi Station in China, 9 in MPEC 2013-X14 -- 2013 WN, 2013 TH5, 2013 TB80, 360433, 185851, 177651, 16834, 137099, 5587
C95SATINO-1 in France, 1 in MPEC 2013-X14 -- 2013 WX44
461SZTE Asteroid Program in Hungary, 1 in MPEC 2013-X14 -- 85839
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-X20 -- 2013 WT67
204Schiaparelli Obs. in Italy, 8 in MPECs 2013-X14, 2013-X16 & 2013-X20 -- 2013 WT67, 2013 WP67, 2008 UW5, 2008 TA1, 2006 HU30, 2000 KA, 1999 SK10, 376788
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-X20 -- 2013 WT67
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2013-X14, 2013-X15 & 2013-X20 -- 2013 WZ44, 2013 WT67, 2013 WT45, 2013 WT43, 2013 WR43, 2013 WN67, 2008 VN
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2013-X18 -- 2013 WR67
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 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 WT67JPL Sentry23182041-21131142.8e-07-3.12-3.890JPL: "Analysis based on 14 observations spanning 3.0134 days (2013-Nov-29.48337 to 2013-Dec-02.49679)." Diameter approximately 0.950 km. from mean, weighted H=17.8.
2013 WS67JPL Sentry23182046-211331.8e-07-5.70-5.870JPL: "Analysis based on 16 observations spanning 2.8849 days (2013-Nov-29.47282 to 2013-Dec-02.35771)." Diameter approximately 0.078 km. from mean, weighted H=23.2.
2013 WR67JPL Sentry23182021-2109441.5e-06-3.55-3.650JPL: "Analysis based on 14 observations spanning 2.7392 days (2013-Nov-29.30924 to 2013-Dec-02.048421)." Diameter approximately 0.149 km. from mean, weighted H=21.8.
2013 WZ44JPL Sentry2114211118.4e-07-6.63-6.630JPL: "Analysis based on 25 observations spanning 3.8395 days (2013-Nov-28.411 to 2013-Dec-02.25054)." Diameter approximately 0.026 km. from mean, weighted H=25.6.
2013 WX44JPL Sentry2114207112.3e-07-7.05-7.050JPL: "Analysis based on 18 observations spanning 2.6628 days (2013-Nov-27.50384 to 2013-Nov-30.1666)." Diameter approximately 0.024 km. from mean, weighted H=25.8.
2013 WT43JPL Sentry21142052-209341.1e-07-5.28-5.540JPL: "Analysis based on 26 observations spanning 5.8537 days (2013-Nov-26.32112 to 2013-Dec-02.17484)." Diameter approximately 0.111 km. from mean, weighted H=22.4.
NEODyS16062051-209373.0e-07-4.88-5.060NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2013-11-26.322 to 2013-12-01.386."

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 2 December '13

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

2318Noted that JPL Sentry has posted 2013 WR67 as an impact risk - see above
Noted that JPL Sentry has posted 2013 WS67 as an impact risk - see above
Noted that JPL Sentry has posted 2013 WT67 as an impact risk - see above
Noted Radar Astrometry database update - see above
2114Noted that JPL Sentry has updated its 2013 WT43 risk assessment - see above
Noted that JPL Sentry has updated its 2013 WX44 risk assessment - see above
Noted that JPL Sentry has updated its 2013 WZ44 risk assessment - see above
Grabbed MPEC 2013-X17 - 2013 WQ67 - see above
Grabbed MPEC 2013-X18 - 2013 WR67 - see above
Grabbed MPEC 2013-X19 - 2013 WS67 - see above
Grabbed MPEC 2013-X20 - 2013 WT67 - see above
1957Grabbed MPEC 2013-X15 - 2013 WN67 - see above
Grabbed MPEC 2013-X16 - 2013 WP67 - see above
1821Updated Traffic Report
1803Grabbed MPEC 2013-X14 - Daily Orbit Update - see above
1606Noted that NEODyS has updated its 2013 WT43 risk assessment - see above
Grabbed MPEC 2013-X11 - 1998 WP7 = 2013 WS45 - see above
Grabbed MPEC 2013-X12 - 2009 SV171 - see above
Grabbed MPEC 2013-X13 - 2013 UR3 - see above