Contents  on 21 November '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 21 November '18

Twelve objects reported inside ten LD

Twelve asteroidal objects are known to be inside ten lunar distances (LD) of our planet today. The two closest are risk-listed intruder 2018 WJ, outbound from 4.28 to 8.44 LD, and 2018 TG6, inbound from 5.06 to 4.90 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
0.31 LD Nov. 19 2018 WJ 11 m  4.28 to 8.44 LD Nov. 17 - 22 intruder, risk
0.50 LD Nov. 16 2018 WH 4 m  8.13 to 9.84 LD Nov. 10 - 22 intruder, NHATS target, risk - DOU
0.62 LD Nov. 18 2018 WE 7 m  6.94 to 9.79 LD Nov. 15 - 22 intruder, risk
0.87 LD Nov. 13 2018 VC7 11 m  7.66 to 8.62 LD Nov. 2 - 23 intruder, NHATS target, risk
1.95 LD Nov. 17 2018 VS8 12 m  8.08 to 10.10 LD Nov. 12 - 21 exits ten LD
2.97 LD Nov. 16 2018 WV 27 m  8.69 to 10.44 LD Nov. 11 - 21 exits ten LD
3.92 LD Dec. 2 2018 TG6 12 m  4.90 from 5.06 LD Oct. 30 - Jan. 5 NHATS target
4.39 LD Nov. 18 2018 VH10 33 m  9.11 to 11.98 LD Nov. 15 - 21 exits ten LD
4.52 LD Nov. 24 2018 WD 50 m  8.63 from 11.35 LD today - Nov. 27 enters ten LD - DOU
6.77 LD Nov. 18 2018 WF 17 m  8.97 to 10.68 LD Nov. 15 - 21 exits ten LD
7.63 LD yesterday 2018 VP7 16 m  7.68 to 7.92 LD Nov. 15 - 25 NHATS target
8.21 LD Nov. 25 2018 VT7 9 m  8.44 from 8.58 LD Nov. 15 - Dec. 7 NHATS target

This report was generated at 1840 UTC with follow-up in today's DOU MPEC for departed 2018 VL3, risk-listed outbound intruder 2018 WH, inbound 2018 WD, and approaching 163899 2003 SD220. This last also had its radar recovery posted yesterday from August 25th, demonstrating the quality of the orbit solution and the kilometer size of this object, pinged almost 94 LD from Earth while out of view for ground-based optical telescopes, which picked it up 43 days later.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
7.4   LD Nov. 27* 2008 WD14 89 m  12.8 from 14.6 LD Nov. 23 - 30 EPU +/- 2.04 days*
2.6   LD Dec. 15* 2018 VO9 15 m  14.4 from 15.0 LD Nov. 29 - Dec. 31 EPU +/- 1.28 hours*, NHATS target, risk
4.1   LD Dec. 9* 2013 VX4 62 m  26.2 from 27.6 LD Dec. 3 - 15 EPU +/- 2.35 days*
7.84 LD Dec. 10 2001 XG1 74 m  60.08 from 63.54 LD Dec. 8 - 12
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  40.52 from 41.70 LD Dec. 17 - 26 radar/NHATS target - DOU, radar
7.3   LD Jan. 9* 2013 YM2 19 m  46.4 from 47.2 LD Jan. 2 - 16 EPU +/- 1.25 days*, NHATS target
* EPU = Earth passage uncertainty



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 21 November '18

The MPC's NEO Confirmation Page has 24 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 24 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 29 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 21 November '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 21 Nov. '18 >>  MPEC 2018-W47 - "13:08 UT" - Daily Orbit Update

Observers  on 21 November '18

Thirteen observers appear in today's MPEC.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 34 in MPEC 2018-W47 -- 2018 QN1, 2014 JU54, 523815, 523788, 523628, 518735, 518635, 518463, 455550, 446924, 438429, 427643, 414903, 36284, 31345, 256412, 250697, 250162, 244670, 208617, 18109, 17274, 163818, 154656, 154300, 137032, 13553, 12538, 9856, 6456, 4401, 1916, 1865, 719
T08ATLAS Mauna Loa in Hawaii, 13 in MPEC 2018-W47 -- 2009 SV17, 65706, 523824, 523805, 457260, 454177, 450779, 325769, 16816, 163899, 3552, 3200, 1620
073Bucharest Obs. in Romania, 2 in MPEC 2018-W47 -- 398188, 13553
160Castelmartini Obs. in Italy, 3 in MPEC 2018-W47 -- 88263, 140928, 12538
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2018-W47 -- 2018 TL2, 2014 JU54
X31Galilei Obs., 1 in MPEC 2018-W47 -- 2010 GT7
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 11 in MPEC 2018-W47 -- 2018 WH, 2018 VL3, 2018 VK6, 2018 VH3, 2018 UA1, 2018 SK3, 2018 SA3, 2018 PT21, 2018 LK2, 2018 LB1, 2017 BQ93
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-W47 -- 523815
C23Olmen Obs. in Belgium, 1 in MPEC 2018-W47 -- 163899
F52Pan-STARRS 2 (PS2) in Hawaii, 2 in MPEC 2018-W47 -- 2011 WA, 523596
247roving observer, 2 in MPEC 2018-W47 -- 2018 VW3, 2018 VN3
C95SATINO-1 in France, 1 in MPEC 2018-W47 -- 85804
345Sobaeksan Obs. in South Korea, 1 in MPEC 2018-W47 -- 2018 WD
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 November '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2358 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2018 WHJPL Sentry17002053-21181860.0008206778472-5.70-5.870JPL: Computed at 07:30 today Pacific time based on 37 observations spanning 4.2692 days (2018-Nov-17.25041 to 2018-Nov-21.5196). Diameter approximately 0.004 km. from weighted mean H=29.86.
NEODyS17002053-21183936.01e-04-5.85-6.12-NEODyS: "Based on 38 optical observations (of which 1 are rejected as outliers) from 2018-11-17.241 to 2018-11-21.520."

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 21 November '18

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

1840Generated Traffic Report
1700Noted that JPL Sentry has updated its 2018 WH risk assessment - see above
Noted that NEODyS has updated its 2018 WH risk assessment - see above
Grabbed MPEC 2018-W47 - Daily Orbit Update - see above