Contents  on 1 December '17

Asteroid/Comet Connection (A/CC) Resources:

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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 1 December '17

Five objects reported inside ten LD

Today there are five small Solar-System bodies reported within ten lunar distances (LD) of our home world. Nearest of these are recently recovered NHATS target 2008 WM61, which is inbound from 3.99 to 3.70 LD, and 2017 WF16, outbound from 4.09 to 4.56 LD.

Earth passage I D ~Size Distance Today  Notes
3.67 LD tomorrow2008 WM61 15 m  3.70 from 3.99 LD NHATS target
3.72 LD Nov. 292017 WF16 6 m  4.09 to 4.56 LD NHATS target
4.45 LD Nov. 282017 WD28 25 m  7.72 to 10.31 LD exits ten LD - DOU
6.39 LD Nov. 302017 WH2 46 m  6.71 to 8.63 LD
7.78 LD Nov. 282017 WK1 14 m  9.38 to 10.50 LD exits ten LD, NHATS target

This report was generated at 1716 UTC with follow-up in today's DOU MPEC for 2017 WD28, which leaves the ten-LD space today, and departed radar target 496817 1989 VB.

Approaching (sorted by 10-LD bubble entry date)
9.45 LD Dec. 52017 WS13 40 m  < 10 LD Dec. 4
3.35 LD Dec. 142006 XY 54 m  < 10 LD Dec. 5, NHATS target
3.44 LD Dec. 92017 WV12 24 m  < 10 LD Dec. 5
9.71 LD Dec. 142015 XX169 11 m  < 10 LD Dec. 12, NHATS target
3.8   LD Dec. 172017 VT14 100 m  < 10 LD Dec. 13, uncertainty +/- 40 mins., risk, comet nucleus?
7.6   LD Dec. 242017 WZ14 31 m  < 10 LD Dec. 18, uncertainty +/- 54 mins., radar/NHATS target
3.7   LD Feb. 242017 DR109 10 m  < 10 LD Feb. 18, uncertainty +/- 30 mins., NHATS target
3.7   LD March 72017 VR12 268 m  < 10 LD Feb. 28, uncertainty +/- 1.2667 hours, 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 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.

Radar Astrometry  on 1 December '17

Radar observation of two objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 0100 UTC when the database was dated 30 Nov.


Data update noted at 2150 UTC when the database was dated 1 Dec.

NEOCP Activity  on 1 December '17

The MPC's NEO Confirmation Page has 42 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 42 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 43 listings on the NEOCP today.

New MPECs  on 1 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 1 Dec. '17 >>  MPEC 2017-X01 - "13:06 UT" - Daily Orbit Update

Observers  on 1 December '17

A total of 20 observers appear in today's MPEC.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 85989
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPEC 2017-X01 -- 2017 WD28, 2017 WB13, 2017 WA13, 2017 VX14, 2017 VU, 2017 VM2, 2017 UZ42, 2017 UZ4, 2017 SY20, 2017 SS19, 2015 XK351, 2014 YC15, 2012 QJ45, 1999 AF4, 88188, 85818, 68950, 504887, 504680, 496005, 17182, 16657, 162472, 154589, 142040, 100926, 8037, 1980
069Baldone Obs. in Latvia, 1 in MPEC 2017-X01 -- 2017 UW42
160Castelmartini Obs. in Italy, 8 in MPEC 2017-X01 -- 68950, 505178, 504680, 500749, 497176, 438897, 333888, 1980
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2017-X01 -- 2017 UW42, 2014 UR116
D08Ghezz Obs. in Switzerland, 1 in MPEC 2017-X01 -- 17182
253Goldstone DSS-14 70m antenna in southern California, 2 in radar -- 85989, 163696
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2017-X01 -- 2017 SO17
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2017-X01 -- 2017 KO4, 2007 DM41
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2017-X01 -- 2017 KE3
Z80Northolt Branch Obs. in England, 3 in MPEC 2017-X01 -- 163696, 3200, 3122
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2017-X01 -- 2017 UW42, 2017 JB
Z38Picoto Obs., 2 in MPEC 2017-X01 -- 3200, 3122
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-X01 -- 2017 UW42
Y00SONEAR in Brazil, 1 in MPEC 2017-X01 -- 2014 UR116
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2017-X01 -- 2017 UW42, 2017 KO4, 2017 KE3, 2017 JB
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-X01 -- 3122
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-X01 -- 496817
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-X01 -- 2010 HD33
C51WISE in Earth polar orbit, 5 in MPEC 2017-X01 -- 2017 VO15, 2017 UE45, 2008 SP7, 337228, 143992
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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 1 December '17

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

2150Noted Radar Astrometry database update - see above
1716Generated Traffic Report
1600Grabbed MPEC 2017-X01 - Daily Orbit Update - see above
0100Noted Radar Astrometry database update - see above