Contents  on 29 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 29 November '18

Six objects reported inside ten LD

Six asteroidal objects are reported inside ten lunar distances (LD) of Earth today. Nearest are risk-listed 2018 WH1, heading out from 3.06 to 3.92 LD, and 2018 TG6, which moves inward from 4.05 to 3.99 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  9.74 to 10.36 LD Oct. 29 - today intruder, NHATS target, exits ten LD, risk
1.18 LD Nov. 25 2018 WH1 7 m  3.06 to 3.92 LD Nov. 15 - Dec. 6 Moon buzzer, NHATS target, risk - DOU
2.62 LD Dec. 15 2018 VO9 13 m  9.91 from 10.48 LD today - Dec. 31 NHATS target, enters ten LD, risk - DOU
3.92 LD Dec. 2 2018 TG6 12 m  3.99 from 4.05 LD Oct. 30 - Jan. 5 NHATS target
8.21 LD Nov. 25 2018 VT7 9 m  8.38 to 8.49 LD Nov. 15 - Dec. 7 NHATS target
9.44 LD yesterday 2008 WD14 89 m  9.52 to 10.01 LD Nov. 26 - 29 exits ten LD

This report was generated at 1840 UTC with the discovery of departed 2018 WM1 (MPEC), which went past our planet at 5.70 LD on November 25th, and with follow-up in today's DOU MPEC for approaching 163899 2003 SD220 and for four risk-listed objects: inbound 2018 VO9, outbound 2018 WH1, departed intruder 2018 WE1, and departed 2018 WS (first follow-up, 9.89 days added to 1.00-day discovery arc).

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
4.1   LD Dec. 9* 2013 VX4 62 m  14.9 from 16.3 LD Dec. 3 - 15 EPU +/- 2.35 days*
7.84 LD Dec. 10 2001 XG1 74 m  33.45 from 36.67 LD Dec. 8 - 12
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  30.75 from 31.99 LD Dec. 17 - 26 radar/NHATS target - DOU
7.3   LD Jan. 9* 2013 YM2 19 m  39.5 from 40.4 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 29 November '18

The MPC's NEO Confirmation Page has 63 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 63 objects listed. Of these, 25 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 29 November '18

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-W75 - "16:56 UT" - Comet P/2017 TW13 (Lemmon)


<< DOU on 29 Nov. '18 >>  MPEC 2018-W74 - "13:13 UT" - Daily Orbit Update


MPEC 2018-W73 - "12:52 UT" - 2014 WZ200


MPEC 2018-W72 - "03:10 UT" - 2017 SK17


MPEC 2018-W71 - "02:12 UT" - 2018 WL1


MPEC 2018-W70 - "02:08 UT" - 2018 WM1

Observers  on 29 November '18

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

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2018-W74 -- 2018 WE1, 2018 VX6, 2018 VN3
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2018-W74 -- 2011 AA37, 2009 SV17
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-W75 -- P/2017 TW13
703Catalina Sky Survey (CSS) in Arizona, 27 in MPECs 2018-W74 & 2018-W75 -- P/2017 TW13, 2015 XQ55, 96590, 85774, 523815, 457212, 455550, 442742, 438429, 413002, 375505, 32906, 256412, 250162, 21088, 20790, 18109, 163902, 155334, 155110, 154300, 153591, 12538, 7358, 6456, 5143, 5131
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-W75 -- P/2017 TW13
K51Celado Obs. in Italy, 1 in MPEC 2018-W75 -- P/2017 TW13
807Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPEC 2018-W74 -- 2018 VS5, 2018 VB7, 2018 TW5, 2018 TD4
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2018-W72 & 2018-W74 -- 2018 WC, 2018 VO7, 2018 TT2, 2018 LO5, 2018 KG1, 2017 SK17
A77Chante-Perdrix Obs. in France, 1 in MPEC 2018-W75 -- P/2017 TW13
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-W75 -- P/2017 TW13
K88GINOP-KHK in Hungary, 1 in MPEC 2018-W75 -- P/2017 TW13
U695Hidetaka Sato in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2018-W75 -- P/2017 TW13
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-W75 -- P/2017 TW13
246KLENOT in the Czech Republic, 1 in MPEC 2018-W75 -- P/2017 TW13
K38M57 Obs. in Italy, 2 in MPECs 2018-W74 & 2018-W75 -- P/2017 TW13, 163899
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2018-W70, 2018-W71 & 2018-W75 -- 2018 WM1, 2018 WL1, P/2017 TW13
C41MASTER-II Kislovodsk in Russia, 1 in MPEC 2018-W74 -- 2061
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2018-W70, 2018-W71, 2018-W73 & 2018-W75 -- 2018 WM1, 2018 WL1, P/2017 TW13, 2014 WZ200
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-W74 -- 2009 SV17
I41Palomar Transient Factory (PTF) in southern California, 7 in MPEC 2018-W74 -- 2012 MS4, 2010 AK, 2008 WP1, 89355, 86039, 265661, 6455
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-W75 -- P/2017 TW13
F52Pan-STARRS 2 (PS2) in Hawaii, 2 in MPECs 2018-W73 & 2018-W75 -- P/2017 TW13, 2014 WZ200
K63Pascoli Obs. in Italy, 1 in MPEC 2018-W75 -- P/2017 TW13
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2018-W75 -- P/2017 TW13
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-W70 -- 2018 WM1
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2018-W74 & 2018-W75 -- P/2017 TW13, 2010 GT7
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-W75 -- P/2017 TW13
C95SATINO-1 in France, 1 in MPEC 2018-W74 -- 2018 QN1
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-W75 -- P/2017 TW13
G40#J.L. Tuten in Arkansas via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-W75 -- P/2017 TW13
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-W75 -- P/2017 TW13
587Sormano Obs. in Italy, 1 in MPEC 2018-W70 -- 2018 WM1
691Spacewatch 0.9m telescope in Arizona, 14 in MPECs 2018-W74 & 2018-W75 -- 2018 WP, 2018 WE1, 2018 VZ8, 2018 VX6, 2018 VN3, 2018 VF6, 2018 UJ, 2018 TW5, 2018 TN6, P/2017 TW13, 2017 MV4, 2017 MB1, 2014 XR6, 2011 HE24
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2018-W74 -- 2018 WH1, 2018 VO9, 2018 VO6, 2018 VM7, 2018 VB5
I52Steward Obs. Mt. Lemmon Station in Arizona, 26 in MPECs 2018-W70, 2018-W71, 2018-W74 & 2018-W75 -- 2018 WS, 2018 WM1, 2018 WL1, 2018 WH1, 2018 WE1, 2018 WB, 2018 VZ3, 2018 VX, 2018 VW5, 2018 VW1, 2018 VV1, 2018 VT3, 2018 VM3, 2018 VG10, 2018 VF3, 2018 VC5, 2018 VB4, 2018 VA9, 2018 UY, 2018 UN1, 2018 RL, 2018 NU3, P/2017 TW13, 2017 KE35, 2015 RJ83, 2009 WL6
A71Stixendorf Obs. in Austria, 1 in MPEC 2018-W75 -- P/2017 TW13
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-W74 -- 523812
L01Visnjan Obs., 2 in MPECs 2018-W70 & 2018-W71 -- 2018 WM1, 2018 WL1
C51WISE in Earth polar orbit, 5 in MPEC 2018-W74 -- 2018 WD1, 2018 PL9, 2015 SF20, 31345, 208617
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 November '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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 WH1NEODyS17062067-2113272.32e-05-6.69-7.480NEODyS: "Based on 47 optical observations (of which 1 are rejected as outliers) from 2018-11-27.259 to 2018-11-29.297."
JPL Sentry16312067-2113191.3396914e-05-6.95-7.700JPL: Computed at 08:18 today Pacific time based on 46 observations spanning 2.0379 days (2018-Nov-27.25828 to 2018-Nov-29.29619). Diameter approximately 0.007 km. from weighted mean H=28.45.
2018 WE1NEODyS17062071-207435.58e-07-6.75-6.90NEODyS: "Based on 55 optical observations (of which 1 are rejected as outliers) from 2018-11-26.470 to 2018-11-29.242."
JPL Sentry16312063-210271.8096e-06-6.22-6.530JPL: Computed at 08:17 today Pacific time based on 53 observations spanning 2.7722 days (2018-Nov-26.46885 to 2018-Nov-29.24108). Diameter approximately 0.022 km. from weighted mean H=25.95.
2018 WSJPL Sentry1631R E M O V E DJPL: Risk listing removed at 1603 UTC today
NEODyS1706210616.0e-08-8.42-8.420NEODyS #2 for the day
2018 WPNEODyS1706209814.67e-07-3.91-3.910NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2018-11-17.398 to 2018-11-29.145."
2018 VO9NEODyS17062102-2117211.73e-05-6.24-6.640NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2018-11-09.270 to 2018-11-29.187."
JPL Sentry16312102-2110140.0001083901-5.43-5.890JPL: Computed at 08:00 today Pacific time based on 24 observations spanning 19.916 days (2018-Nov-09.26967 to 2018-Nov-29.1859). Diameter approximately 0.013 km. from weighted mean H=27.01.
2018 VO6NEODyS1706204818.86e-09-7.49-7.490NEODyS: "Based on 59 optical observations (of which 0 are rejected as outliers) from 2018-11-05.411 to 2018-11-29.337."
2007 YMNEODyS17062020-21151468.85e-06-5.77-6.660NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2007-12-17.397 to 2007-12-17.525."

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 29 November '18

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

1840Generated Traffic Report
1731Grabbed MPEC 2018-W75 - Comet P/2017 TW13 (Lemmon) - see above
1706Noted that NEODyS has updated its 2007 YM risk assessment - see above
Noted that NEODyS has updated its 2018 VO6 risk assessment - see above
Noted that NEODyS has updated its 2018 VO9 risk assessment - see above
Noted that NEODyS has updated its 2018 WE1 risk assessment - see above
Noted that NEODyS has updated its 2018 WH1 risk assessment - see above
Noted that NEODyS has updated its 2018 WP risk assessment - see above
Noted that NEODyS has reposted 2018 WS as an impact risk - see above
1631Noted that JPL Sentry has updated its 2018 VO9 risk assessment - see above
Noted that JPL Sentry has updated its 2018 WE1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 WH1 risk assessment - see above
Noted that JPL Sentry has removed 2018 WS as an impact risk - see above
1600Noted that NEODyS has removed 2018 WS as an impact risk - see above
Grabbed MPEC 2018-W73 - 2014 WZ200 - see above
Grabbed MPEC 2018-W74 - Daily Orbit Update - see above
0325Grabbed MPEC 2018-W70 - 2018 WM1 - see above
Grabbed MPEC 2018-W71 - 2018 WL1 - see above
Grabbed MPEC 2018-W72 - 2017 SK17 - see above