Contents  on 27 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 27 November '13

Three objects reported inside ten LD

There are three objects reported passing within ten lunar distances (LD) of our planet today. Inside Earth's Hill sphere, radar target 2013 NJ is outbound from 2.80 to 3.77 LD, and, further away, radar target 2001 AV43 is receding from 7.14 to 7.87 LD and newly announced 2013 WY is headed outward from 7.21 to 7.53 LD.

This report was updated at 2248 UTC with new discovery 2013 WY (MPEC). This report was previously updated at 1817 UTC with today's DOU MPEC reporting the recovery of 2013 NJ and first follow-up for departed risk-listed 2013 VD17. Today's first traffic report was generated at 1534 UTC, noting the discovery announced late yesterday of already departed risk-listed 2013 WM.

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 27 November '13

The MPC's NEO Confirmation Page has 78 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 78 objects listed. Of these, 53 were "one nighters." So far The Tracking News has counted a total of 95 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 27 November '13

Minor Planet Electronic Circulars

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

MPEC 2013-W24 - "20:48 UT" - 2013 WY

MPEC 2013-W23 - "17:51 UT" - Comet P/2013 W1 (Panstarrs)

<< DOU on 27 Nov. '13 >>  MPEC 2013-W22 - "17:32 UT" - Daily Orbit Update

MPEC 2013-W21 - "15:40 UT" - 2011 CG71

Observers  on 27 November '13

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
C77Bernezzo Obs. in Italy, 1 in MPEC 2013-W22 -- 2013 TB80
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2013-W22, 2013-W23 & 2013-W24 -- 2013 WY, P/2013 W1, 2013 TB80, 2008 HO3, 360433, 8201, 1627
K51Celado Obs., 1 in MPEC 2013-W22 -- 251346
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2013-W22 -- 2013 WH, 2013 NJ, 2008 XP2, 2005 SC71, 2002 XS40, 2001 QC34
958Dax Obs. in France, 2 in MPECs 2013-W23 & 2013-W24 -- 2013 WY, P/2013 W1
448Desert Moon Obs. in New Mexico, 6 in MPEC 2013-W22 -- 2013 VO5, 2013 VK5, 2013 UG9, 2008 XP2, 34613, 185702
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-W23 -- P/2013 W1
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2013-W22 -- 96315
K38M57 Obs., 1 in MPEC 2013-W22 -- 2013 UR3
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2013-W21 & 2013-W22 -- 2013 VD17, 2011 CG71
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-W24 -- 2013 WY
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-W22 -- 89830
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPECs 2013-W22 & 2013-W23 -- P/2013 W1, 2013 VC10, 2013 UF5, 2013 UC, 2013 TS4, 85839, 65996, 311066, 242708, 185851, 138205, 10115, 3988
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2013-W22 -- 2013 SK19, 2013 PV6, 170903, 8201
B04Saint-Barthelemy Obs. in Italy, 2 in MPECs 2013-W22 & 2013-W24 -- 2013 WY, 2013 TV135
H36Sandlot Obs. in Kansas, 2 in MPECs 2013-W22 & 2013-W24 -- 2013 WY, 2013 VY13
033Schwarzschild Obs. in Germany, 1 in MPEC 2013-W22 -- 2013 WL
G404Don Cranford, Jr. in North Carolina via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-W22 -- 2013 UR3
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2013-W22 -- 377097, 311066
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2013-W22 & 2013-W23 -- P/2013 W1, 2013 US3, 2013 UG5, 2013 TS132, 2013 TH135, 2013 SR24, 2013 QJ10, 2008 QS11
926Tenagra II Obs. in Arizona, 2 in MPECs 2013-W22 & 2013-W23 -- P/2013 W1, 2013 VX13
718Wiggins Obs. in Utah, 1 in MPEC 2013-W24 -- 2013 WY
Q62(program code "(" (17) via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-W23 -- P/2013 W1
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2013-W22 & 2013-W23 -- P/2013 W1, 2013 UQ4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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 WMNEODyS15332026-2105121.41e-06-4.39-4.440NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2013-11-25.247 to 2013-11-26.355."
JPL Sentry01312026-2105141.9e-06-4.24-4.300JPL: "Analysis based on 10 observations spanning 1.1079 days (2013-Nov-25.24629 to 2013-Nov-26.35422)." Diameter approximately 0.051 km. from mean, weighted H=24.1.
2013 VD17JPL Sentry20152065-207521.1e-06-6.95-7.160JPL: "Analysis based on 19 observations spanning 12.273 days (2013-Nov-14.24215 to 2013-Nov-26.515389)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
2013 VJ13NEODyS14092099-210969.35e-07-5.55-5.910NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2013-11-10.136 to 2013-11-26.372."

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 27 November '13

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

2248Updated Traffic Report
2212Grabbed MPEC 2013-W24 - 2013 WY - see above
2015Noted that JPL Sentry has updated its 2013 VD17 risk assessment - see above
2014Grabbed MPEC 2013-W23 - Comet P/2013 W1 (Panstarrs) - see above
1816Grabbed MPEC 2013-W22 - Daily Orbit Update - see above
1700Grabbed MPEC 2013-W21 - 2011 CG71 - see above
1533Noted that NEODyS has posted 2013 WM as an impact risk - see above
1409Noted that NEODyS has updated its 2013 VJ13 risk assessment - see above
0131Noted that JPL Sentry has posted 2013 WM as an impact risk - see above