Contents  on 18 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 18 October '13

Two objects reported inside ten LD

Two visitors are reported to be passing within ten lunar distances (LD) of our home world today. Inside Earth's Hill sphere, risk-listed radar target 2013 UB comes its closest to the Moon this time around, reaching 1.61 LD at 2136 UT. And tiny risk-listed intruder 2013 RZ53, which may be an artificial object, exits ten LD, traveling from 9.77 to 10.11 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 1537 UTC with first follow-up in today's DOU MPEC for 2013 UB plus astrometry from August for departed objects 2013 QR1 and 2013 PR43.

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 18 October '13

The MPC's NEO Confirmation Page has 15 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen objects listed. Of these, six were "one nighters." So far The Tracking News has counted a total of 30 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 18 October '13

Minor Planet Electronic Circulars

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

MPEC 2013-U13 - "20:04 UT" - 2013 UK

MPEC 2013-U12 - "19:57 UT" - 2013 TC136

MPEC 2013-U11 - "16:29 UT" - 2013 SC25

MPEC 2013-U10 - "15:10 UT" - 2012 VU85

<< DOU on 18 Oct. '13 >>  MPEC 2013-U09 - "06:04 UT" - Daily Orbit Update

Observers  on 18 October '13

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPECs 2013-U09 & 2013-U12 -- 2013 TT135, 2013 TC136, 2013 TB80, 2012 TS, 2010 XZ67, 65733, 350751, 252793, 250620, 243147, 220909, 162566, 159399, 141052, 8014, 4486, 1981
703Catalina Sky Survey in Arizona, 1 in MPEC 2013-U12 -- 2013 TC136
448Desert Moon Obs. in New Mexico, 6 in MPECs 2013-U09 & 2013-U12 -- 2013 TC136, 2013 RB74, 2008 JR26, 2006 HU30, 2001 RY47, 350751
F656Richard Miles in England via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-U12 -- 2013 TC136
J95Great Shefford Obs. in England, 3 in MPECs 2013-U09 & 2013-U12 -- 2013 UB, 2013 TV135, 2013 TC136
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2013-U09 -- 2013 TV135
560Madonna di Dossobuono Obs. in Italy, 2 in MPEC 2013-U09 -- 2010 GY6, 2009 WE253
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-U09 -- 3908
G96Mt. Lemmon Survey (MLS) in Arizona, 29 in MPECs 2013-U09, 2013-U11, 2013-U12 & 2013-U13 -- 2013 UK, 2013 TX5, 2013 TR5, 2013 TQ5, 2013 TO69, 2013 TL135, 2013 TJ135, 2013 TH69, 2013 TE6, 2013 TE135, 2013 TD6, 2013 TC6, 2013 TC136, 2013 SR24, 2013 SR, 2013 SO19, 2013 SC25, 2013 SB21, 2013 RZ73, 2013 RM43, 2013 RF36, 2013 RB74, 2010 VD1, 2010 CD55, 2005 BW1, 1999 SG10, 250620, 170903, 141052
0892Oleksandr V. Shulga via Nikolaev Obs. in the Ukraine, 13 in MPEC 2013-U09 -- 2013 QR1, 2013 PX6, 2013 PR43, 2013 BO76, 2010 TN54, 2006 EE1, 361071, 329437, 308043, 243147, 153349, 137126, 4450
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2013-U09 & 2013-U11 -- 2013 SC25, 85770, 65996, 141052
A32Panker Obs. in Germany, 1 in MPEC 2013-U09 -- 12711
C95SATINO-1 in France, 1 in MPEC 2013-U09 -- 361071
G403program code 3 via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-U09 -- 162694
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-U12 -- 2013 TC136
926Tenagra II Obs. in Arizona, 3 in MPECs 2013-U09, 2013-U11 & 2013-U12 -- 2013 TC136, 2013 SC25, 16834
2905Richard P. Boyle via Vatican Advanced Technology Telescope in Arizona, 1 in MPEC 2013-U10 -- 2012 VU85
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 UBJPL Sentry15362093-211231.7e-07-7.98-8.030JPL: "Analysis based on 26 observations spanning 1.5462 days (2013-Oct-16.25495 to 2013-Oct-17.801182)." Diameter approximately 0.015 km. from mean, weighted H=26.8.
NEODyS15362100-2112101.05e-07-8.26-8.880NEODyS: "Based on 28 optical observations (of which 2 are rejected as outliers) from 2013-10-16.256 to 2013-10-17.802."
2013 TV135JPL Sentry15362032-204722.1e-05-1.72-1.731JPL: "Analysis based on 32 observations spanning 9.0178 days (2013-Oct-08.85531 to 2013-Oct-17.87308)." Diameter approximately 0.400 km. from mean, weighted H=19.6.
NEODyS15362032-204724.36e-05-1.41-1.411NEODyS: "Based on 34 optical observations (of which 2 are rejected as outliers) from 2013-10-08.856 to 2013-10-17.874."

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 18 October '13

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

2007Grabbed MPEC 2013-U12 - 2013 TC136 - see above
Grabbed MPEC 2013-U13 - 2013 UK - see above
1639Grabbed MPEC 2013-U11 - 2013 SC25 - see above
1537Generated Traffic Report
1536Noted that JPL Sentry has updated its 2013 TV135 risk assessment - see above
Noted that NEODyS has updated its 2013 TV135 risk assessment - see above
Noted that JPL Sentry has posted 2013 UB as an impact risk - see above
Noted that NEODyS has posted 2013 UB as an impact risk - see above
Grabbed MPEC 2013-U09 - Daily Orbit Update - see above
Grabbed MPEC 2013-U10 - 2012 VU85 - see above