Contents  on 31 October '18

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 31 October '18

Five objects reported inside ten LD

There are five asteroidal objects known to be inside ten lunar distances (LD) of our planet today. Nearest is inbound 2018 UD3, which moves in from 4.76 to 3.27 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
1.62 LD Nov. 2 2018 UD3 19 m  3.27 from 4.76 LD Oct. 27 - Nov. 8 DOU
3.9   LD Dec. 2* 2018 TG6 11 m  9.5 from 9.8 LD yesterday - Jan. 5 EPU +/- 8 mins.*, NHATS target, risk
5.37 LD yesterday 2018 UC 22 m  5.40 to 5.99 LD Oct. 26 - Nov. 3 NHATS target
7.51 LD Oct. 29 475534 2006 TS7 195 m  9.68 to 12.66 LD Oct. 27 - 31 exits ten LD
* EPU = Earth passage uncertainty

This report was generated at 1910 UTC with follow-up in today's DOU MPEC for inbound 2018 UD3 and approaching objects 2018 UY1 and 2018 TF3.

Due to travel, time constraints, and delays in data source availability, more or less in that order of importance, we posted only a minimal report here on Saturday, October 27th, and no report for the following two days, finally catching up late yesterday. To see what asteroid observations were reported by whom on those days, see the respective DOU MPECs.

In view of such problems in data flow and processing, which are increasing but not usually so visible to our readers, this may be a good time to give first notice that we will be retiring this Web site sometime over the next twenty-three months, quite possibly sooner. While we don't expect to find a knowledgeable volunteer to assume the work and responsibilities, and make a fresh start at continuing what we've been doing here for sixteen-plus years, but we're certainly open to the possibility.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
7.42 LD Nov. 4 2018 UY1 52 m  10.41 from 11.81 LD Nov. 1 - 8 NHATS target - DOU
7.77 LD Nov. 5 2018 TF3 286 m  23.35 from 27.78 LD Nov. 4 - 7 DOU
9.4   LD Nov. 13* 2018 UQ1 146 m  37.7 from 40.6 LD Nov. 12 - 15 EPU +/- 9 mins.*
7.4   LD Nov. 27* 2008 WD14 89 m  53.3 from 55.1 LD Nov. 23 - 30 EPU +/- 2.04 days*
4.1   LD Dec. 9* 2013 VX4 62 m  54.0 from 55.3 LD Dec. 3 - 15 EPU +/- 2.35 days*
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  62.76 from 63.64 LD Dec. 17 - 26 NHATS target
7.3   LD Jan. 9* 2013 YM2 19 m  61.5 from 62.1 LD Jan. 2 - 16 EPU +/- 1.25 days*, NHATS target

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 temporal 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 31 October '18

The MPC's NEO Confirmation Page has 6 listings

When last checked at 2331 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six objects listed. Of these, two were "one nighters."

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 31 October '18

Minor Planet Electronic Circulars

As of last check at 2331 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 31 Oct. '18 >>  MPEC 2018-U90 - "12:04 UT" - Daily Orbit Update

Observers  on 31 October '18

Nine observers appear in today's MPEC.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2018-U90 -- 2018 RL, 65733, 443923, 308043
J95Great Shefford Obs. in England, 6 in MPEC 2018-U90 -- 2018 UY1, 2018 UM1, 2018 UK2, 2018 UD3, 2018 UC3, 2018 UA3
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2018-U90 -- 523592, 443923
D29Purple Mtn. Obs. Xuyi Station in China, 16 in MPEC 2018-U90 -- 2018 PE22, 2018 NB, 523596, 457260, 446791, 414903, 413002, 250162, 244670, 17511, 155340, 140333, 12538, 9058, 5653, 1916
247roving observer, 3 in MPEC 2018-U90 -- 2018 UY1, 2018 TF3, 2015 NU2
C95SATINO-1 in France, 1 in MPEC 2018-U90 -- 2018 UA1
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-U90 -- 2018 UY1, 2018 NB
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2018-U90 -- 2018 US2
718Wiggins Obs. in Utah, 6 in MPEC 2018-U90 -- 2018 UY1, 2018 UJ1, 2018 TT1, 2018 TQ2, 2018 RL, 2015 NU2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 October '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2331 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 and NEODyS listings is 100 years, and both post impact solutions beyond that for some 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
2018 UM1JPL Sentry17002067-2116205.415961e-05-3.91-4.310JPL: Computed at 07:04 today Pacific time based on 91 observations spanning 11.758 days (2018-Oct-19.1455 to 2018-Oct-30.903047). Diameter approximately 0.070 km. from weighted mean H=23.42.
2014 HR197JPL Sentry17002019-21121947.78473e-08-7.25-8.300JPL: Computed at 10:48 April 9th of 2017 Pacific time based on 15 observations spanning .95899 days (2014-Apr-24.15618 to 2014-Apr-25.11517). Diameter approximately 0.014 km. from weighted mean H=26.93.

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 31 October '18

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

1910Generated Traffic Report
1700Noted that JPL Sentry has updated its 2014 HR197 risk assessment - see above
Noted that JPL Sentry has updated its 2018 UM1 risk assessment - see above
Grabbed MPEC 2018-U90 - Daily Orbit Update - see above