Contents  on 17 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 17 October '13

Three objects reported inside ten LD

Three objects are reported moving within ten lunar distances (LD) of our planet today. Newly announced 2013 UB enters Earth's Hill sphere, coming in from 4.53 to 2.95 LD, while risk-listed intruder 2013 RZ53 is outbound from 9.43 to 9.77 LD and 2013 TM127 departs from inside ten LD, traveling from 8.28 to 10.73 LD.

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

This report was generated at 1636 UTC with new discovery 2013 UB (MPEC) and follow-up in today's DOU MPEC for departed radar target 2013 SU24.

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 17 October '13

The MPC's NEO Confirmation Page has 25 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 25 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 31 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 17 October '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-U08 - "14:32 UT" - 2013 UC

MPEC 2013-U07 - "14:27 UT" - 2013 UB

MPEC 2013-U06 - "13:31 UT" - 2008 VV

<< DOU on 17 Oct. '13 >>  MPEC 2013-U05 - "06:03 UT" - Daily Orbit Update

Observers  on 17 October '13

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPECs 2013-U05, 2013-U07 & 2013-U08 -- 2013 UC, 2013 UB, 2013 TX5, 2013 TS4, 2013 TL69, 2013 TK4, 2013 TH69, 2013 TC4, 2013 SX19, 2013 SR24, 2013 SN20, 2013 SM20, 2013 RH74
C77Bernezzo Obs. in Italy, 1 in MPEC 2013-U05 -- 252793
300Bisei Spaceguard Center in Japan, 2 in MPEC 2013-U05 -- 252793, 162694
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2013-U05 -- 2013 TS4, 65996, 252793, 162694, 162273, 5863
I51Clinton Obs., 1 in MPEC 2013-U05 -- 3361
F656Richard Miles in England via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-U08 -- 2013 UC
J95Great Shefford Obs. in England, 2 in MPECs 2013-U07 & 2013-U08 -- 2013 UC, 2013 UB
G38La Senda Obs., 1 in MPEC 2013-U05 -- 2009 WE253
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-U05 -- 3908
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2013-U05, 2013-U06, 2013-U07 & 2013-U08 -- 2013 UC, 2013 UB, 2008 VV, 65996, 162873, 3752, 1863
A24New Millennium Obs. in Italy, 11 in MPEC 2013-U05 -- 2013 PX6, 2012 TS, 88710, 361071, 350988, 24445, 168378, 9950, 4450, 3691, 2100
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-U05 -- 251346
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2013-U05 -- 105140
204Schiaparelli Obs. in Italy, 1 in MPEC 2013-U07 -- 2013 UB
G404program code 4 via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-U05 -- 2013 RH74
926Tenagra II Obs. in Arizona, 23 in MPEC 2013-U05 -- 2013 TY5, 2013 TV5, 2013 TV135, 2013 TU135, 2013 TS4, 2013 TR132, 2013 TM135, 2013 TL, 2013 TK, 2013 TJ135, 2013 TH69, 2013 TH135, 2013 TF135, 2013 TE135, 2013 TD4, 2013 TC6, 2013 TB80, 2013 SU24, 2013 SK19, 2013 SE21, 2013 SB21, 2013 RH74, 1863
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 October '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 TV135JPL Sentry18062032-204721.6e-05-1.84-1.851JPL: "Analysis based on 27 observations spanning 7.4584 days (2013-Oct-08.85531 to 2013-Oct-16.31374)." Diameter approximately 0.400 km. from mean, weighted H=19.6.
NEODyS14562032-204722.77e-05-1.62-1.621NEODyS: "Based on 29 optical observations (of which 2 are rejected as outliers) from 2013-10-08.856 to 2013-10-16.315."

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 17 October '13

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

1806Noted that JPL Sentry has updated its 2013 TV135 risk assessment - see above
1636Generated Traffic Report
1456Noted that NEODyS has updated its 2013 TV135 risk assessment - see above
Grabbed MPEC 2013-U05 - Daily Orbit Update - see above
Grabbed MPEC 2013-U06 - 2008 VV - see above
Grabbed MPEC 2013-U07 - 2013 UB - see above
Grabbed MPEC 2013-U08 - 2013 UC - see above