Contents  on 28 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 28 November '13

Three objects reported inside ten LD

Three asteroids are reported to be within ten lunar distances (LD) of Earth today. Radar target 2013 NJ exits Earth's Hill sphere, passing from 3.77 to 5.02 LD. Further out, 2013 WY is outbound from 7.53 to 7.94 LD and radar target 2001 AV43 from 7.87 to 8.61 LD.

This report was updated at 2017 UTC to note that today's DOU MPEC carries follow-up for 2013 NJ and first follow-up for 2013 WY and for departed risk-rated 2013 VW13. Today's first traffic report was generated at 1329 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.

NEOCP Activity  on 28 November '13

The MPC's NEO Confirmation Page has 118 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 118 objects listed. Of these, 55 were "one nighters."

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 28 November '13

Minor Planet Electronic Circulars

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

<< DOU on 28 Nov. '13 >>  MPEC 2013-W26 - "17:32 UT" - Daily Orbit Update

MPEC 2013-W25 - "04:03 UT" - 2009 WR25

Observers  on 28 November '13

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 10 in MPEC 2013-W26 -- 2013 TH5, 376729, 36236, 279744, 254419, 18109, 170903, 162273, 138852, 8176
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPEC 2013-W26 -- 2013 SF, 2013 QH48, 2013 NJ, 2013 LW28, 2009 XC2, 2008 TA1, 2007 JJ35, 2007 BG, 2006 YF13, 2006 SU131, 2005 WR54, 1990 SM
006Fabra Obs. in Spain, 1 in MPEC 2013-W26 -- 2013 UR3
240Herrenberg Obs. in Germany, 2 in MPEC 2013-W26 -- 2011 WM2, 2008 UW5
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-W26 -- 2013 VW13
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2013-W26 -- 2013 TH5, 52760, 251346
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPEC 2013-W26 -- 2013 WY, 2013 VR12, 2002 HF8, 1997 WB21, 96315, 162004
A13Naef Obs. in Switzerland, 1 in MPEC 2013-W26 -- 2008 WK32
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-W26 -- 360433
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPEC 2013-W26 -- 2013 TC136, 2012 AS10, 2010 VE1, 2009 WC52, 2009 HB, 2008 WK32, 2007 VC138, 373393, 370688, 265661, 8201
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 15 in MPEC 2013-W26 -- 2013 VY13, 2013 UR3, 2013 TV135, 2013 TS4, 2013 TB80, 2013 SK19, 2011 WM2, 2010 SL13, 2006 HU30, 2003 WX25, 1997 WQ23, 52760, 29075, 251346, 10115
D29Purple Mtn. Obs. Xuyi Station in China, 10 in MPEC 2013-W26 -- 2013 TL117, 2008 UW5, 2003 SJ215, 39565, 363790, 276786, 17511, 141052, 7753, 1943
G403Tony Evans in Portugal via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-W26 -- 6178
926Tenagra II Obs. in Arizona, 4 in MPECs 2013-W25 & 2013-W26 -- 2013 VP12, 2011 CG71, 2009 WR25, 2008 WK32
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 November '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.





Notes for Today's Latest Risk Assessments
2013 VD17NEODyS13292065-208241.08e-06-6.95-7.20NEODyS: "Based on 20 optical observations (of which 1 are rejected as outliers) from 2013-11-14.243 to 2013-11-26.516."
2013 VW13JPL Sentry20172076-2097121.5e-04-4.43-4.610JPL: "Analysis based on 25 observations spanning 14.231 days (2013-Nov-12.17353 to 2013-Nov-26.404487)." Diameter approximately 0.019 km. from mean, weighted H=26.3.

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 28 November '13

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

2017Noted that JPL Sentry has updated its 2013 VW13 risk assessment - see above
Grabbed MPEC 2013-W26 - Daily Orbit Update - see above
Updated Traffic Report
1329Noted that NEODyS has updated its 2013 VD17 risk assessment - see above
Grabbed MPEC 2013-W25 - 2009 WR25 - see above