Contents  on 5 October '17

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection.

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. To keep track of what's new each day, watch the Chronology section.

Traffic Report  on 5 October '17

Three objects reported inside ten LD

There are three minor planets known to be inside ten lunar distances (LD) of Earth today. Nearest is intruder 2017 SX17, which is outbound from 3.91 to 5.42 LD. Much further away, the much anticipated intruder 2012 TC4 comes inside ten LD, slipping in from 10.74 to 9.26 LD. It is risk listed and is a target for planetary radar and NHATS.

Earth passage I D ~Size Distance Today  Notes
0.13 LD Oct. 122012 TC4 15 m  9.26 from 10.74 LD intruder, enters ten LD, radar/NHATS target, risk
0.23 LD Oct. 22017 SX17 8 m  3.91 to 5.42 LD intruder
5.38 LD Oct. 32017 SS16 18 m  8.40 to 11.45 LD exits ten LD
Approaching (sorted by 10-LD bubble entry date)
8.94 LD Oct. 112017 SB20 36 m  < 10 LD Oct. 8
8.5   LD Oct. 132005 TE49 15 m  < 10 LD Oct. 11, uncertainty +/- 10.1167 hours, NHATS target
5.77 LD Oct. 22171576 1999 VP11 645 m  < 10 LD Oct. 20
8.66 LD Nov. 17444584 2006 UK 309 m  < 10 LD Nov. 16, NEW

This report was generated at 1644 UTC with the addition of 444584 2006 UK to this reporting. It is now coming into view for many observers.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's gravitational sphere of influence (SOI), which has a radius of about 2.41 LD from Earth's center. This puts a focus on some of the most important and very best NEO observation work, representative of the much larger NEO discovery and tracking effort. Object distances are derived 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 5 October '17

The MPC's NEO Confirmation Page has 95 listings

When last checked at 2342 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 95 objects listed. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 103 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 5 October '17

Minor Planet Electronic Circulars

As of last check at 2342 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 5 Oct. '17 >>  MPEC 2017-T16 - "12:17 UT" - Daily Orbit Update

Observers  on 5 October '17

Seven observers appear in today's MPEC.

CodeObserver / observatory
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-T16 -- 294739
160Castelmartini Obs. in Italy, 11 in MPEC 2017-T16 -- 2017 RV1, 2017 MY3, 2017 FJ90, 2004 TQ13, 90075, 68950, 55408, 496005, 265962, 220909, 142040
0895N.V. Maigurova via Nikolaev Obs. in Ukraine, 4 in MPEC 2017-T16 -- 2015 KN120, 326388, 4197, 3753
W71Rand II Obs. in New York, 1 in MPEC 2017-T16 -- 496018
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-T16 -- 3122
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-T16 -- 250458
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-T16 -- 2011 OE26
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 October '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2342 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 NASA/JPL Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2017 OO1NEODyS1450R E M O V E D-

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale (next 100 years)

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 5 October '17

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

1644Generated Traffic Report
1450Noted that NEODyS has removed 2017 OO1 as an impact risk - see above
Grabbed MPEC 2017-T16 - Daily Orbit Update - see above