Contents  on 26 November '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 26 November '13

Two objects reported inside ten LD

Two visitors are reported to be within a radius of ten lunar distances (LD) from our home world today. Within Earth's Hill sphere, radar target 2013 NJ comes its closest to Earth this time around, reaching 2.47 LD at 0308 UT. More distantly, radar target 2001 AV43 is outbound from 6.42 to 7.14 LD.

This report was updated at 1816 UTC to note today's DOU MPEC with first follow-up for departed risk-listed 2013 VJ13. Today's first traffic report was generated at 1432 UTC.



Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. 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 26 November '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 2358 UTC when the database was dated 26 Nov.

NEOCP Activity  on 26 November '13

The MPC's NEO Confirmation Page has 50 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 50 objects listed. Of these, 36 were "one nighters." So far The Tracking News has counted a total of 56 listings on the NEOCP today.

New MPECs  on 26 November '13

Minor Planet Electronic Circulars

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


MPEC 2013-W20 - "23:34 UT" - 2013 WN


MPEC 2013-W19 - "23:29 UT" - 2013 WM


MPEC 2013-W18 - "23:20 UT" - 2013 WL


MPEC 2013-W17 - "19:59 UT" - 2008 RS26


MPEC 2013-W16 - "18:16 UT" - Comet C/2012 S1 (ISON)


<< DOU on 26 Nov. '13 >>  MPEC 2013-W15 - "17:32 UT" - Daily Orbit Update

Observers  on 26 November '13

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

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 1997 WQ23
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPEC 2013-W15 -- 2013 VZ11, 2013 VE13
L22Barlad Obs., 2 in MPEC 2013-W15 -- 2013 UR3, 2010 CL19
I99Blanquita Obs. in Spain, 2 in MPEC 2013-W15 -- 2010 XZ67, 2003 WX25
703Catalina Sky Survey (CSS) in Arizona, 11 in MPEC 2013-W15 -- 2013 UR3, 2013 TS4, 2008 JR26, 42286, 377097, 30825, 275545, 168378, 9950, 8014, 3988
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2013-W15 -- 2013 WH, 2013 VJ2, 2013 VE13, 2013 TS5, 2013 TH5, 2013 RB74, 2013 QG17, 2011 XE, 2010 LJ14, 2004 XN14, 53319
Z81Estrella de Mar Obs., 1 in MPEC 2013-W15 -- 2013 VY13
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-W20 -- 2013 WN
J37Huelva Obs. in Spain, 2 in MPEC 2013-W15 -- 1627, 433
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2013-W15 & 2013-W17 -- 2013 VJ13, 2008 RS26
C91Montevenere Obs., 2 in MPEC 2013-W15 -- 2013 UR3, 251346
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2013-W15 -- 2013 VK2, 2013 VB14, 377097, 168378, 16834
A13Naef Obs. in Switzerland, 1 in MPEC 2013-W15 -- 2003 ND
A24New Millennium Obs. in Italy, 33 in MPECs 2013-W15 & 2013-W20 -- 2013 WN, 2013 VO5, 2013 VA10, 2013 TV135, 2013 TS4, 2013 TE6, 2013 SC25, 2012 ER14, 2011 WM2, 2010 XZ67, 2010 SL13, 2009 WE253, 2006 HU30, 2005 RQ6, 2003 WX25, 52760, 369984, 265661, 251346, 249595, 22771, 20460, 17511, 16834, 163249, 162694, 162566, 162273, 141079, 12923, 12711, 9950, 3988
C23Olmen Obs. in Belgium, 1 in MPEC 2013-W15 -- 2010 CL19
F51Pan-STARRS 1 (PS1) in Hawaii, 15 in MPECs 2013-W15, 2013-W18, 2013-W19 & 2013-W20 -- 2013 WN, 2013 WM, 2013 WL, 2013 VO5, 2013 TE135, 2011 WU95, 2009 HB, 2004 GY, 2000 JO78, 66008, 373393, 285331, 265661, 189973, 138205
D29Purple Mtn. Obs. Xuyi Station in China, 11 in MPEC 2013-W15 -- 2013 TB80, 2003 ND, 85839, 350751, 194126, 16834, 162273, 159399, 9950, 5143, 3988
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-W15, 2013-W18 & 2013-W20 -- 2013 WN, 2013 WL, 2013 VB14
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2013-W20 -- 2013 WN
033Schwarzschild Obs. in Germany, 1 in MPEC 2013-W19 -- 2013 WM
G404Don Cranford, Jr. in North Carolina via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-W15 -- 1997 WQ23
291Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2013-W15, 2013-W18 & 2013-W20 -- 2013 WN, 2013 WL, 2013 UP8, 2013 UH9, 2013 TW135, 2013 TT135, 2013 SW24, 2013 RK16, 2013 RJ74, 2013 QJ10, 2013 OE, 2013 GG69, 2013 GF69, 2008 QS11
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2013-W20 -- 2013 WN
926Tenagra II Obs. in Arizona, 5 in MPECs 2013-W15, 2013-W18, 2013-W19 & 2013-W20 -- 2013 WN, 2013 WM, 2013 WL, 2013 VE13, 2013 VB14
718Wiggins Obs. in Utah, 1 in MPEC 2013-W15 -- 2013 VD13
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2013-W15 -- 2010 CL19, 141079
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 November '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 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 VJ13JPL Sentry22062099-210951.1e-06-5.47-5.810JPL: "Analysis based on 41 observations spanning 16.237 days (2013-Nov-10.13475 to 2013-Nov-26.371601)." Diameter approximately 0.061 km. from mean, weighted H=23.7.
29075 1950 DAJPL Sentry1426288012.5e-04-0.83-0.83-JPL: "Analysis based on 8 radar delay, 4 Doppler, and 492 optical observations spanning 22899.0 days (1950-Feb-22.230140 to 2012-Nov-02.272872)." Diameter approximately 1.300 km. from mean, weighted H=17.6.

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 26 November '13

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

2358Grabbed MPEC 2013-W18 - 2013 WL - see above
Grabbed MPEC 2013-W19 - 2013 WM - see above
Grabbed MPEC 2013-W20 - 2013 WN - see above
Noted Radar Astrometry database update - see above
2206Noted that JPL Sentry has updated its 2013 VJ13 risk assessment - see above
Grabbed MPEC 2013-W16 - Comet C/2012 S1 (ISON) - see above
Grabbed MPEC 2013-W17 - 2008 RS26 - see above
1816Updated Traffic Report
1806Grabbed MPEC 2013-W15 - Daily Orbit Update - see above
1426Noted that JPL Sentry has updated its 29075 1950 DA risk assessment - see above