Contents  on 4 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 4 December '13

One object reported inside ten LD

One asteroid is reported flying within ten lunar distances (LD) of Earth today. 2013 WV43 leaves ten LD, passing from 9.62 to 10.14 LD.

This report was updated at 1809 UTC with follow-up in today's DOU MPEC for departed objects risk-listed 2013 WX44 and radar target 2013 NJ. Today's first traffic report was generated at 1629 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 4 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 2315 UTC when the database was dated 4 Dec.

NEOCP Activity  on 4 December '13

The MPC's NEO Confirmation Page has 38 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 38 objects listed. Of these, 20 were "one nighters." So far The Tracking News has counted a total of 42 listings on the NEOCP today.

New MPECs  on 4 December '13

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 4 Dec. '13 >>  MPEC 2013-X24 - "17:33 UT" - Daily Orbit Update

Observers  on 4 December '13

A total of 24 observers appear in today's MPEC.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2001 AV43
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2013-X24 -- 2013 WT45, 2013 WN, 2013 WL, 2013 WH, 2013 TV144, 2013 TD4, 2009 XC2, 2008 TA1, 2003 YO1, 172718, 141056
L22Barlad Obs., 3 in MPEC 2013-X24 -- 361071, 138095, 9950
W11Calumet Astronomy Center in Indiana, 1 in MPEC 2013-X24 -- 1981
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2013-X24 -- 1998 SZ14, 363075, 3691
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2013-X24 -- 2013 WT44
151Eschenberg Obs. in Switzerland, 1 in MPEC 2013-X24 -- 1997 WQ23
Z62Forcarei Obs., 1 in MPEC 2013-X24 -- 2013 UG9
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2001 AV43
238Grorudalen Obs., 4 in MPEC 2013-X24 -- 53435, 162566, 12711, 9950
V37LCOGT Fort Davis in Texas, 1 in MPEC 2013-X24 -- 2013 WA44
130Lumezzane Obs. in Italy, 4 in MPEC 2013-X24 -- 2010 SL13, 52760, 142781, 12923
560Madonna di Dossobuono Obs. in Italy, 3 in MPEC 2013-X24 -- 2013 WT45, 2013 UR3, 2010 XZ67
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-X24 -- 2013 WX44
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2013-X24 -- 2013 WK103, 194126
A24New Millennium Obs. in Italy, 12 in MPEC 2013-X24 -- 2013 UR3, 2003 WX25, 1997 WQ23, 85818, 251346, 21088, 162566, 138852, 138095, 12711, 9950, 1981
C23Olmen Obs. in Belgium, 1 in MPEC 2013-X24 -- 2010 XZ67
F51Pan-STARRS 1 (PS1) in Hawaii, 16 in MPEC 2013-X24 -- 2013 WR67, 2013 WN, 2013 UK, 2013 NJ, 2011 BO24, 2007 LV19, 1998 SZ14, 85709, 54789, 53319, 377097, 275545, 16834, 152756, 9950, 5863
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2013-X24 -- 2013 WK103, 1998 SZ14, 162273
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-X24 -- 2013 WA44
589Santa Lucia Stroncone Obs. in Italy, 1 in MPEC 2013-X24 -- 2013 NJ
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-X24 -- 2013 BE19
926Tenagra II Obs. in Arizona, 3 in MPEC 2013-X24 -- 2013 WV45, 2013 WT45, 1998 SZ14
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2013-X24 -- 2010 CL19, 251346
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 Sentry2032202114.2e-06-2.87-2.870JPL: "Analysis based on 20 observations spanning 4.0091 days (2013-Nov-29.30924 to 2013-Dec-03.31836)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
NEODyS16282021-2086203.11e-06-3.01-3.010NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2013-11-29.310 to 2013-12-03.207."
2013 WZ44NEODyS16282111-211118.31e-07-6.63-6.630NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2013-11-28.412 to 2013-12-03.489."
2013 WX44JPL Sentry2002207112.9e-07-6.93-6.930JPL: "Analysis based on 24 observations spanning 6.0333 days (2013-Nov-27.50384 to 2013-Dec-03.5371)." Diameter approximately 0.024 km. from mean, weighted H=25.7.
NEODyS16282071-207112.89e-07-6.94-6.940NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2013-11-27.505 to 2013-12-03.313."
2013 WT43NEODyS16282052-205931.74e-08-6.11-6.150NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2013-11-26.322 to 2013-12-03.468."
2013 WMNEODyS16282041-210532.23e-06-4.41-4.420NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2013-11-25.247 to 2013-12-03.379."

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 '13

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

2315Noted Radar Astrometry database update - see above
2032Noted that JPL Sentry has updated its 2013 WR67 risk assessment - see above
2002Noted that JPL Sentry has updated its 2013 WX44 risk assessment - see above
1809Updated Traffic Report
1806Grabbed MPEC 2013-X24 - Daily Orbit Update - see above
1628Noted that NEODyS has updated its 2013 WM risk assessment - see above
Noted that NEODyS has updated its 2013 WR67 risk assessment - see above
Noted that NEODyS has updated its 2013 WT43 risk assessment - see above
Noted that NEODyS has updated its 2013 WX44 risk assessment - see above
Noted that NEODyS has updated its 2013 WZ44 risk assessment - see above