Contents  on 23 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 23 November '18

Seven objects reported inside ten LD

There are seven Solar-System small bodies reported inside ten lunar distances (LD) of Earth today. Nearest are inbound objects 2018 TG6, which moves in from 4.74 to 4.60 LD, and 2018 WD, traveling from 6.23 to 4.69 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
0.65 LD Nov. 13 2018 WA1 3 m  6.02 to 6.65 LD Oct. 29 - Nov. 29 NEW, intruder, risk - MPEC
0.87 LD Nov. 13 2018 VC7 11 m  9.58 to 10.55 LD Nov. 2 - 23 intruder, NHATS target, exits ten LD, risk
3.92 LD Dec. 2 2018 TG6 12 m  4.60 from 4.74 LD Oct. 30 - Jan. 5 NHATS target
4.52 LD tomorrow 2018 WD 48 m  4.69 from 6.23 LD Nov. 21 - 27 DOU
7.4   LD Nov. 27* 2008 WD14 89 m  9.7 from 11.2 LD today - Nov. 30 EPU +/- 2.04 days*, enters ten LD
7.63 LD Nov. 20 2018 VP7 16 m  8.35 to 8.94 LD Nov. 15 - 25 NHATS target
8.21 LD Nov. 25 2018 VT7 9 m  8.26 from 8.33 LD Nov. 15 - Dec. 7 NHATS target
* EPU = Earth passage uncertainty

This report was updated at 2315 UTC with the discovery of outbound risk-listed intruder 2018 WA1 (MPEC), which lingered inside our planet's sphere of gravitational influence for a week, and inside the Earth-Moon system for 53-plus hours. Your first neighborhood asteroid traffic report was was generated at 1924 UTC with follow-up in today's DOU MPEC for inbound 2018 WD and departed objects 2018 WF and intruder 2018 WG, plus precovery observation of 2017 FV from March last year, adding 12.03 days to that object's previous 15.61-day observing arc.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
2.6   LD Dec. 15* 2018 VO9 15 m  13.3 from 13.9 LD Nov. 29 - Dec. 31 EPU +/- 1.28 hours*, NHATS target, risk
4.1   LD Dec. 9* 2013 VX4 62 m  23.4 from 24.8 LD Dec. 3 - 15 EPU +/- 2.35 days*
7.84 LD Dec. 10 2001 XG1 74 m  53.23 from 56.64 LD Dec. 8 - 12
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  38.12 from 39.32 LD Dec. 17 - 26 radar/NHATS target
7.3   LD Jan. 9* 2013 YM2 19 m  44.7 from 45.6 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. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 23 November '18

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of 20 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 23 November '18

Minor Planet Electronic Circulars

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


MPEC 2018-W50 - "20:25 UT" - 2018 WA1


<< DOU on 23 Nov. '18 >>  MPEC 2018-W49 - "13:07 UT" - Daily Orbit Update

Observers  on 23 November '18

Thirteen observers appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 29 in MPEC 2018-W49 -- 2016 TS55, 2004 FW1, 2001 VC2, 54660, 523815, 523803, 523779, 523628, 518640, 518635, 516803, 446924, 427643, 31345, 256412, 250697, 244670, 18109, 163818, 162687, 154300, 141484, 13553, 9856, 7482, 4401, 4055, 1916, 719
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2018-W49 -- 2017 FV
595Farra d'Isonzo Obs. in Italy, 2 in MPEC 2018-W49 -- 2018 WG, 2018 WF
E89Geyserland Obs. in New Zealand, 1 in MPEC 2018-W49 -- 1627
Z43Landehen Obs., 3 in MPEC 2018-W49 -- 2018 WC, 2018 VT8, 2011 WA
T04LCO Haleakala OGG B#2 in Hawaii, 1 in MPEC 2018-W49 -- 2018 WD
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-W50 -- 2018 WA1
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2018-W50 -- 2018 WA1
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-W49 -- 2018 WD
J43Oukaimeden Obs. in Morocco, 3 in MPEC 2018-W49 -- 25143, 163051, 155334
F52Pan-STARRS 2 (PS2) in Hawaii, 2 in MPEC 2018-W49 -- 351331, 163818
C95SATINO-1 in France, 1 in MPEC 2018-W49 -- 141079
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-W49 -- 265661, 208617
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 WA1JPL Sentry22052082-2117244.1089817e-05-7.27-7.910JPL: Computed at 13:42 today Pacific time based on 14 observations spanning 6.1297 days (2018-Nov-16.05973 to 2018-Nov-22.18946). Diameter approximately 0.003 km. from weighted mean H=30.01.
2017 FVNEODyS1730R E M O V E D-

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 23 November '18

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

2315Updated Traffic Report
2205Noted that JPL Sentry has posted 2018 WA1 as an impact risk - see above
2031Grabbed MPEC 2018-W50 - 2018 WA1 - see above
1730Noted that NEODyS has removed 2017 FV as an impact risk - see above
Grabbed MPEC 2018-W49 - Daily Orbit Update - see above