Contents  on 6 December '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 6 December '17

Five objects reported inside ten LD

There are five asteroids inside ten lunar distances (LD) of Earth today. Nearest is 2008 WM61, which heads out from 5.19 to 5.97 LD.

Earth passage I D ~Size Distance today  Inside 10 LD Notes
3.35 LD Dec. 14 2006 XY 54 m  8.85 from 9.86 LD yesterday - Dec. 23 NHATS target
3.43 LD Dec. 9 2017 WV12 25 m  7.71 from 9.91 LD yesterday - Dec. 13
3.67 LD Dec. 2 2008 WM61 15 m  5.19 to 5.97 LD Nov. 23 - Dec. 11 NHATS target
3.72 LD Nov. 29 2017 WF16 6 m  7.34 to 8.14 LD Nov. 19 - Dec. 9 NHATS target
9.45 LD yesterday 2017 WS13 40 m  9.51 to 10.13 LD Dec. 4 - 6 exits ten LD
Approaching (sorted by 10-LD bubble entry date)
9.71 LD Dec. 14 2015 XX169 11 m  13.90 from 14.97 LD Dec. 12 - 15 NHATS target
3.8   LD Dec. 17* 2017 VT14 100 m  23.7 from 25.9 LD Dec. 13 - 21 EPU +/- 40 mins.*, radar target, risk, comet nucleus?
7.6   LD Dec. 24* 2017 WZ14 31 m  21.2 from 22.3 LD Dec. 18 - 30 EPU +/- 54 mins.*, radar/NHATS target
3.7   LD Feb. 24* 2017 DR109 10 m  189.9 from 193.1 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.7   LD March 7* 2017 VR12 268 m  133.6 from 135.7 LD Feb. 28 - March 13 EPU +/- 1.27 hours*, radar/NHATS target
* EPU = Earth passage uncertainty

This report was generated at 1812 UTC.

Reading:  NASA/Goddard has a news item (dated November 21st but just noticed at EurekAlert) about a study of gasses released by 45P/Honda-Mrkos-Pajdusakova (1948 X1) on its passage early this year that shows this object "doesn't quite match any comet studied so far."



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 6 December '17

The MPC's NEO Confirmation Page has 30 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 30 objects listed. Of these, six 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 6 December '17

Minor Planet Electronic Circulars

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


<< DOU on 6 Dec. '17 >>  MPEC 2017-X15 - "13:03 UT" - Daily Orbit Update

Observers  on 6 December '17

Twelve observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2017-X15 -- 1999 AF4, 333888, 17182, 16657, 154589, 1980
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2017-X15 -- 2017 WL1, 2017 SO17
T08ATLAS Mauna Loa in Hawaii, 9 in MPEC 2017-X15 -- 87311, 68950, 505178, 333888, 16834, 16657, 142040, 7977, 1865
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-X15 -- 3200
K83Forti Obs., 1 in MPEC 2017-X15 -- 3200
A13Naef Obs. in Switzerland, 2 in MPEC 2017-X15 -- 2017 SO17, 3200
C23Olmen Obs. in Belgium, 1 in MPEC 2017-X15 -- 3200
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2017-X15 -- 2017 WX12, 2015 BF4, 53110, 138852
G40'program code "'" (16) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-X15 -- 143992
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-X15 -- 2017 WX12
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-X15 -- 3200
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-X15 -- 2003 GQ22
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 December '17

At last check (NEODyS at 2358 UTC) there was no risk monitoring news to report yet today. Visit the CRT to view activity in the last four weeks and our ephemerides page for a complete list of risk-rated objects under current observation or having recent news.

Chronology  on 6 December '17

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

1812Generated Traffic Report
1730Grabbed MPEC 2017-X15 - Daily Orbit Update - see above