Contents  on 30 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 30 November '18

Seven objects reported inside ten LD

There are seven minor planets known to be within ten lunar distances (LD) of our planet today. The nearest is newly announced risk-listed intruder 2018 WV1, which enters the Earth-Moon system, coming in from 1.19 to 0.71 LD, headed for a 0.086-LD passage Sunday.

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
0.09 LD Dec. 2 2018 WV1 3 m  0.71 from 1.19 LD Nov. 8 - Dec. 25 NEW, intruder today, inside Earth SOI, risk - MPEC
0.28 LD Nov. 27 2018 WZ1 5 m  8.05 to 11.19 LD Nov. 24 - 30 NEW, intruder, exits ten LD, risk - MPEC
1.18 LD Nov. 25 2018 WH1 7 m  3.92 to 4.80 LD Nov. 15 - Dec. 6 Moon buzzer, NHATS target, risk
2.62 LD Dec. 15 2018 VO9 13 m  9.33 from 9.91 LD yesterday - Dec. 31 NHATS target, risk
3.92 LD Dec. 2 2018 TG6 12 m  3.95 from 3.99 LD Oct. 30 - Jan. 5 NHATS target
6.56 LD Nov. 28 2018 WT1 29 m  7.86 to 9.26 LD Nov. 24 - Dec. 1 NEW - MPEC
8.21 LD Nov. 25 2018 VT7 9 m  8.49 to 8.63 LD Nov. 15 - Dec. 7 NHATS target

This report was generated at 2310 UTC with five discoveries -- risk-listed intruders inbound 2018 WV1 (MPEC) and outbound 2018 WZ1 (MPEC), which flew by us at 0.28 LD on November 27th, approaching 2018 WX1 (MPEC), and departed objects 2018 WY1 (MPEC), which came to 1.45 LD on November 26th, and 2018 WT1 (MPEC), which went by at 6.56 LD on November 28th. Today's DOU MPEC has follow-up for approaching objects 163899 2003 SD220 and 2001 XG1, and for departed objects 2008 WD14 and risk-listed 2018 VC

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
4.8   LD Dec. 7* 2018 WX1 52 m  13.8 from 15.8 LD Dec. 3 - 11 NEW, EPU +/- 5 mins.* - MPEC
4.1   LD Dec. 9* 2013 VX4 62 m  13.5 from 14.9 LD Dec. 3 - 15 EPU +/- 2.35 days*
7.84 LD Dec. 10 2001 XG1 74 m  30.27 from 33.45 LD Dec. 8 - 12 DOU
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  29.50 from 30.75 LD Dec. 17 - 26 radar/NHATS target - DOU
7.3   LD Jan. 9* 2013 YM2 19 m  38.6 from 39.5 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 30 November '18

The MPC's NEO Confirmation Page has 51 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 51 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 68 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 30 November '18

Minor Planet Electronic Circulars

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


MPEC 2018-W87 - "14:58 UT" - 2018 VL10


<< DOU on 30 Nov. '18 >>  MPEC 2018-W86 - "13:06 UT" - Daily Orbit Update


MPEC 2018-W85 - "12:11 UT" - 2018 WZ1


MPEC 2018-W84 - "12:07 UT" - 2018 WY1


MPEC 2018-W83 - "12:03 UT" - 2018 WX1


MPEC 2018-W82 - "11:58 UT" - 2018 WW1


MPEC 2018-W81 - "11:52 UT" - 2018 WV1


MPEC 2018-W80 - "11:49 UT" - 2018 WR1


MPEC 2018-W79 - "11:46 UT" - 2018 WU1


MPEC 2018-W78 - "11:43 UT" - 2018 WT1


MPEC 2018-W77 - "11:39 UT" - 2018 WS1


MPEC 2018-W76 - "11:36 UT" - 2018 WQ1

Observers  on 30 November '18

A total of 37 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2018-W86 -- 2018 VW1, 2018 VK1, 2018 VC, 2018 UZ, 2018 UG3, 2018 UA1, 2018 TT1, 2018 TQ2, 2018 SB1, 2018 SA3
T05ATLAS Haleakala in Hawaii, 6 in MPEC 2018-W86 -- 2018 VE4, 2018 TS, 2018 QN1, 2011 AA37, 2001 XG1, 523811
T08ATLAS Mauna Loa in Hawaii, 5 in MPEC 2018-W86 -- 2018 TS, 2015 WY1, 2014 JU54, 2008 WD14, 1998 YF10
C77Bernezzo Obs. in Italy, 2 in MPECs 2018-W78 & 2018-W83 -- 2018 WX1, 2018 WT1
160Castelmartini Obs. in Italy, 2 in MPECs 2018-W78 & 2018-W83 -- 2018 WX1, 2018 WT1
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2018-W79 & 2018-W81 -- 2018 WV1, 2018 WU1
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPECs 2018-W84 & 2018-W85 -- 2018 WZ1, 2018 WY1
Z99Clixby Obs. in England, 2 in MPECs 2018-W78 & 2018-W83 -- 2018 WX1, 2018 WT1
113Drebach Obs. in Germany, 2 in MPECs 2018-W78 & 2018-W83 -- 2018 WX1, 2018 WT1
734Farpoint Obs. in Kansas, 1 in MPEC 2018-W87 -- 2018 VL10
X31Galilei Obs., 1 in MPEC 2018-W79 -- 2018 WU1
J95Great Shefford Obs. in England, 3 in MPECs 2018-W78, 2018-W81 & 2018-W82 -- 2018 WW1, 2018 WV1, 2018 WT1
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 2 in MPECs 2018-W78 & 2018-W83 -- 2018 WX1, 2018 WT1
585Kiev Comet Station in Ukraine, 2 in MPECs 2018-W78 & 2018-W83 -- 2018 WX1, 2018 WT1
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2018-W87 -- 2018 VL10
K38M57 Obs. in Italy, 1 in MPEC 2018-W83 -- 2018 WX1
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2018-W77, 2018-W78, 2018-W79, 2018-W80, 2018-W82, 2018-W83 & 2018-W85 -- 2018 WZ1, 2018 WX1, 2018 WW1, 2018 WU1, 2018 WT1, 2018 WS1, 2018 WR1
568^R. Wainscoat on Mauna Kea in Hawaii, 2 in MPECs 2018-W86 & 2018-W87 -- 2018 VL10, 2000 AA6
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2018-W77, 2018-W78, 2018-W80, 2018-W82, 2018-W83, 2018-W84, 2018-W85 & 2018-W86 -- 2018 WZ1, 2018 WY1, 2018 WX1, 2018 WW1, 2018 WT1, 2018 WS1, 2018 WR1, 2014 JO92
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-W78 -- 2018 WT1
Z80Northolt Branch Obs. in England, 3 in MPECs 2018-W78, 2018-W83 & 2018-W86 -- 2018 WX1, 2018 WT1, 2009 SV17
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-W76 -- 2018 WQ1
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-W86 -- 2014 JO92
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-W87 -- 2018 VL10
K63Pascoli Obs. in Italy, 2 in MPECs 2018-W78 & 2018-W83 -- 2018 WX1, 2018 WT1
L04ROASTERR-1 in Romania, 2 in MPECs 2018-W78 & 2018-W83 -- 2018 WX1, 2018 WT1
K61Rokycany Obs. in the Czech Republic, 4 in MPECs 2018-W78, 2018-W80, 2018-W82 & 2018-W83 -- 2018 WX1, 2018 WW1, 2018 WT1, 2018 WR1
104San Marcello Pistoiese Obs. in Italy, 5 in MPECs 2018-W77, 2018-W78, 2018-W79, 2018-W81 & 2018-W83 -- 2018 WX1, 2018 WV1, 2018 WU1, 2018 WT1, 2018 WS1
H36Sandlot Obs. in Kansas, 2 in MPECs 2018-W81 & 2018-W83 -- 2018 WX1, 2018 WV1
C95SATINO-1 in France, 4 in MPECs 2018-W78, 2018-W80, 2018-W83 & 2018-W86 -- 2018 WX1, 2018 WT1, 2018 WR1, 4401
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-W86 -- 163899
691Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2018-W86 & 2018-W87 -- 2018 VR9, 2018 VL10, 2018 VK6, 2018 VJ5, 2018 VE4, 2016 RH18
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2018-W86 & 2018-W87 -- 2018 WN, 2018 VL10, 2018 VE5, 2018 PG22
I52Steward Obs. Mt. Lemmon Station in Arizona, 10 in MPECs 2018-W76, 2018-W77, 2018-W78, 2018-W79, 2018-W80, 2018-W81, 2018-W82, 2018-W83, 2018-W84 & 2018-W87 -- 2018 WY1, 2018 WX1, 2018 WW1, 2018 WV1, 2018 WU1, 2018 WT1, 2018 WS1, 2018 WR1, 2018 WQ1, 2018 VL10
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-W86 -- 2018 UZ
K41Vegaquattro Obs. in Italy, 1 in MPEC 2018-W83 -- 2018 WX1
L01Visnjan Obs., 10 in MPECs 2018-W76, 2018-W77, 2018-W78, 2018-W79, 2018-W80, 2018-W81, 2018-W82, 2018-W83, 2018-W85 & 2018-W87 -- 2018 WZ1, 2018 WX1, 2018 WW1, 2018 WV1, 2018 WU1, 2018 WT1, 2018 WS1, 2018 WR1, 2018 WQ1, 2018 VL10
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 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 WZ1JPL Sentry17302034-203413.499e-08-8.97-8.970JPL: Computed at 05:30 today Pacific time based on 19 observations spanning 1.8675 days (2018-Nov-28.36851 to 2018-Nov-30.23599). Diameter approximately 0.005 km. from weighted mean H=29.33.
2018 WV1JPL Sentry17302053-2118270.0001325317672-6.76-7.190JPL: Computed at 09:07 today Pacific time based on 28 observations spanning .80848 days (2018-Nov-29.23429 to 2018-Nov-30.04277). Diameter approximately 0.003 km. from weighted mean H=30.11.
2018 WR1JPL Sentry17302081-208115.824e-09-5.84-5.840JPL: Computed at 04:58 today Pacific time based on 28 observations spanning 2.6193 days (2018-Nov-27.32523 to 2018-Nov-29.9445). Diameter approximately 0.300 km. from weighted mean H=20.29.
2018 VCJPL Sentry17302108-211799.49e-06-6.12-6.400JPL: Computed at 07:10 today Pacific time based on 136 observations spanning 27.136 days (2018-Nov-01.24873 to 2018-Nov-28.38492). Diameter approximately 0.019 km. from weighted mean H=26.29.
2008 VS4JPL Sentry17302019-21143126.032072e-07-5.45-6.320JPL: Computed at 00:23 April 8th of 2017 Pacific time based on 10 observations spanning .08330 days (2008-Nov-07.413 to 2008-Nov-07.4963). Diameter approximately 0.049 km. from weighted mean H=24.22.

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 30 November '18

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

2310Generated Traffic Report
1730Noted that JPL Sentry has updated its 2008 VS4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 VC risk assessment - see above
Noted that JPL Sentry has posted 2018 WR1 as an impact risk - see above
Noted that JPL Sentry has posted 2018 WV1 as an impact risk - see above
Noted that JPL Sentry has posted 2018 WZ1 as an impact risk - see above
Grabbed MPEC 2018-W76 - 2018 WQ1 - see above
Grabbed MPEC 2018-W77 - 2018 WS1 - see above
Grabbed MPEC 2018-W78 - 2018 WT1 - see above
Grabbed MPEC 2018-W79 - 2018 WU1 - see above
Grabbed MPEC 2018-W80 - 2018 WR1 - see above
Grabbed MPEC 2018-W81 - 2018 WV1 - see above
Grabbed MPEC 2018-W82 - 2018 WW1 - see above
Grabbed MPEC 2018-W83 - 2018 WX1 - see above
Grabbed MPEC 2018-W84 - 2018 WY1 - see above
Grabbed MPEC 2018-W85 - 2018 WZ1 - see above
Grabbed MPEC 2018-W86 - Daily Orbit Update - see above
Grabbed MPEC 2018-W87 - 2018 VL10 - see above