Contents  on 20 October '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 20 October '13

One object reported inside ten LD

One object is reported moving within ten lunar distances (LD) of our planet today. Within Earth's Hill sphere, risk-listed radar target 2013 UB is outbound from 1.92 to 3.23 LD.

Radar target 2001 AV43 arrives inside ten LD on November 6th and radar target 2013 NJ comes in on November 19th.

This report was generated at 1550 UTC with follow-up in today's DOU MPEC for 2013 UB and departed 2013 TG6.

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 20 October '13

The MPC's NEO Confirmation Page has 10 listings

When last checked at 2145 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had ten objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of eighteen 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 20 October '13

Minor Planet Electronic Circulars

As of last check at 2154 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 20 Oct. '13 >>  MPEC 2013-U15 - "06:02 UT" - Daily Orbit Update

Observers  on 20 October '13

Eighteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2013-U15 -- 2013 TZ5, 2013 TX5, 2013 TS4, 2013 TH69, 2013 TG6, 2013 TF6, 2013 TE6, 2013 TD6, 2013 TB6, 2013 RL21, 2013 OG, 375103
G58Chabot Obs. in northern California, 1 in MPEC 2013-U15 -- 2013 TV135
448Desert Moon Obs. in New Mexico, 4 in MPEC 2013-U15 -- 351278, 350751, 250620, 162980
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 4 in MPEC 2013-U15 -- 2013 TH69, 2010 GY6, 2008 HO3, 350751
J95Great Shefford Obs. in England, 1 in MPEC 2013-U15 -- 2013 UB
D00ISON-Kislovodsk Obs., 1 in MPEC 2013-U15 -- 162149
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2013-U15 -- 2013 TV135
695]Mark Trueblood via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2013-U15 -- 2013 NW
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2013-U15 -- 2013 TV135
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-U15 -- 374038
C47Nonndorf Obs. in Austria, 1 in MPEC 2013-U15 -- 2013 TV135
Y00SONEAR Obs. in Brazil, 2 in MPEC 2013-U15 -- 2007 XY9, 39565
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-U15 -- 2013 TV135
G404program code 4 via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-U15 -- 2013 TV135
673!Jana Pittichova via Table Mtn. Obs. in southern California, 1 in MPEC 2013-U15 -- 2008 HO3
926Tenagra II Obs. in Arizona, 7 in MPEC 2013-U15 -- 2013 UB, 2013 TL69, 2013 SR24, 2013 SR, 2010 UX95, 2008 FT6, 2005 RQ6
718Wiggins Obs. in Utah, 1 in MPEC 2013-U15 -- 2013 TV135
H068program code 8 via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-U15 -- 2013 TV135
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 October '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2155 and JPL at 2154 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 UBNEODyS15462108-211121.19e-08-9.12-9.140NEODyS: "Based on 71 optical observations (of which 4 are rejected as outliers) from 2013-10-16.256 to 2013-10-19.851."
JPL Sentry1546R E M O V E DJPL: Risk listing removed at 1216 UTC.
2013 TV135NEODyS15462032-204721.35e-04-0.86-0.861NEODyS: "Based on 129 optical observations (of which 2 are rejected as outliers) from 2013-10-08.856 to 2013-10-19.953."

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 20 October '13

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

1550Generated Traffic Report
1546Noted that NEODyS has updated its 2013 TV135 risk assessment - see above
Noted that JPL Sentry has removed 2013 UB as an impact risk - see above
Noted that NEODyS has updated its 2013 UB risk assessment - see above
Grabbed MPEC 2013-U15 - Daily Orbit Update - see above