Contents  on 4 January '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 4 January '18

Two objects reported inside ten LD

There are two small Solar-System bodies reported inside ten lunar distances (LD) of our planet today. Both are outbound: 2017 YD7 from 5.26 to 6.64 LD and 2017 YS1 from 7.76 to 8.46 LD.

Earth passage I D ~Size Distance today  Inside ten LD Notes
1.93 LD Dec. 24 2017 YS1 6 m  7.76 to 8.46 LD Dec. 11 - Jan. 7 NHATS target
4.73 LD yesterday 2017 YD7 12 m  5.26 to 6.64 LD Dec. 30 - Jan. 6 NHATS target
Approaching (sorted by 10-LD bubble entry date)
3.7   LD Feb. 24* 2017 DR109 10 m  101.8 from 104.5 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 272 m  82.81 from 84.25 LD Feb. 28 - March 13 radar/NHATS target
* EPU = Earth passage uncertainty

This report was generated at 1750 UTC with follow-up in today's DOU MPEC for departed objects 2017 XS and 2017 VT14.

Reading:  Bad Astronomy blogs today about a paper that proposes 1I/`Oumuamua (A/2017 U1) (see expanded links) may have been ejected from the planetary system of a white dwarf.

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 4 January '18

The MPC's NEO Confirmation Page has 33 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 33 objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 39 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 4 January '18

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 4 Jan. '18 >>  MPEC 2018-A13 - "13:04 UT" - Daily Orbit Update

Observers  on 4 January '18

Nine observers appear in today's MPEC.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 9 in MPEC 2018-A13 -- 415029, 294739, 244977, 16834, 11405, 2329, 1865, 1685, 1036
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2018-A13 -- 2017 YP4, 2007 AG, 85628, 190208, 172034, 137805, 8037, 2368
160Castelmartini Obs. in Italy, 15 in MPEC 2018-A13 -- 2017 VU14, 96590, 85628, 507366, 505667, 415029, 294739, 189173, 152931, 143992, 136849, 136839, 8567, 1866, 1627
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2018-A13 -- 2017 YR1, 2017 YP3, 2017 YD, 2017 XS, 2017 WY12, 2017 VT14
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-A13 -- 2017 SD14
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-A13 -- 96590
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPEC 2018-A13 -- 2017 YX4, 2007 XP3, 2007 AT2, 53110, 323300, 294739, 242216, 136849, 4947
H36Sandlot Obs. in Kansas, 2 in MPEC 2018-A13 -- 2017 VB, 2017 NU6
W881Tony Evans in Portugal via Chile Obs. in Chile, 1 in MPEC 2018-A13 -- 2017 YN3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 January '18

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 4 January '18

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

1750Generated Traffic Report
1650Grabbed MPEC 2018-A13 - Daily Orbit Update - see above