Contents  on 1 December '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 1 December '18

Nine objects reported inside ten LD

Nine small temporary neighbors are being tracked at less than ten lunar distances (LD) from Earth today. Nearest are two risk-listed intruders inside the Earth-Moon system, which newly announced 2018 WG2 leaves, moving out from 0.60 to 1.85 LD, while 2018 WV1 comes closer, flying in from 0.71 to 0.14 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
0.09 LD tomorrow 2018 WV1 3 m  0.14 from 0.71 LD Nov. 8 - Dec. 25 intruder today, NHATS target, inside Earth SOI, risk - DOU
0.52 LD Nov. 30 2018 WG2 3 m  0.60 to 1.85 LD Nov. 23 - Dec. 7 NEW, intruder today, NHATS target, Moon closest 1.26 LD at 0135 UTC, risk - MPEC
1.18 LD Nov. 25 2018 WH1 7 m  4.80 to 5.69 LD Nov. 15 - Dec. 6 Moon buzzer, NHATS target, risk - DOU
2.62 LD Dec. 15 2018 VO9 13 m  8.75 from 9.33 LD Nov. 29 - Dec. 31 NHATS target, risk
2.76 LD today 2018 WF2 7 m  2.76 LD Nov. 27 - Dec. 5 NEW, Earth closest at 1214 UTC - MPEC
3.42 LD Dec. 4 2018 WD2 22 m  5.99 from 7.46 LD Nov. 29 - Dec. 10 NEW - MPEC, DOU
3.92 LD tomorrow 2018 TG6 12 m  3.93 from 3.95 LD Oct. 30 - Jan. 5 NHATS target
6.56 LD Nov. 28 2018 WT1 29 m  9.26 to 10.94 LD Nov. 24 - today exits ten LD
8.21 LD Nov. 25 2018 VT7 9 m  8.63 to 8.80 LD Nov. 15 - Dec. 7 NHATS target

This report was generated at 1950 UTC with the discoveries of risk-listed outbound intruder 2018 WG2 (MPEC), which flew by us at 0.52 LD yesterday, passing 2018 WF2 (MPEC), and inbound 2018 WD2 (MPEC, DOU), plus the recovery of distant 2017 RH16 (MPEC). Today's DOU MPEC has follow-up for approaching 2018 WX1, inbound risk-listed intruder 2018 WV1, outbound risk-listed 2018 WH1, and departed 2018 WM1, as well as astrometry from mid-November for 2018 WA, 2018 WF, intruder 2018 WG, and risk-listed objects 2018 WS and intruder 2018 WJ.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
4.82 LD Dec. 7 2018 WX1 54 m  11.92 from 13.82 LD Dec. 3 - 11 NHATS target - DOU
4.1   LD Dec. 9* 2013 VX4 62 m  12.1 from 13.5 LD Dec. 3 - 15 EPU +/- 2.35 days*
7.84 LD Dec. 10 2001 XG1 74 m  27.13 from 30.27 LD Dec. 8 - 12
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  28.24 from 29.50 LD Dec. 17 - 26 radar/NHATS target
7.3   LD Jan. 9* 2013 YM2 19 m  37.7 from 38.6 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. "Distant" is used here to describe an object that has approached Earth within ten LD since A/CC began these traffic reports eleven-plus years ago but is not currently coming so close. 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 1 December '18

The MPC's NEO Confirmation Page has 40 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 40 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 54 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 1 December '18

Minor Planet Electronic Circulars

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


MPEC 2018-X14 - "19:50 UT" - A/2018 W1


MPEC 2018-X13 - "18:13 UT" - Comet C/2018 V4 (Africano)


MPEC 2018-X12 - "17:30 UT" - A/2018 V3


<< DOU on 1 Dec. '18 >>  MPEC 2018-X11 - "13:05 UT" - Daily Orbit Update


MPEC 2018-X10 - "05:14 UT" - Comet C/2018 V2 (ATLAS)


MPEC 2018-X09 - "04:26 UT" - 2018 WG2


MPEC 2018-X08 - "04:23 UT" - 2018 WE2


MPEC 2018-X07 - "04:20 UT" - 2018 WC2


MPEC 2018-X06 - "04:09 UT" - 2018 WH2


MPEC 2018-X05 - "04:06 UT" - 2018 WF2


MPEC 2018-X04 - "04:02 UT" - 2018 WD2


MPEC 2018-X03 - "03:59 UT" - 2018 WB2


MPEC 2018-X02 - "03:55 UT" - 2018 WA2


MPEC 2018-X01 - "02:53 UT" - 2017 RH16

Observers  on 1 December '18

A total of 64 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-X11 -- 2018 WU1
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2018-X11 & 2018-X14 -- 2018 WH1, 2018 W1
T05ATLAS Haleakala in Hawaii, 5 in MPECs 2018-X04, 2018-X06, 2018-X10, 2018-X11 & 2018-X14 -- 2018 WH2, 2018 WD2, 2018 W1, C/2018 V2, 2018 RL
T08ATLAS Mauna Loa in Hawaii, 4 in MPECs 2018-X01, 2018-X10 & 2018-X11 -- 2018 WD2, 2018 VX6, C/2018 V2, 2017 RH16
I47Auger Obs. in Argentina, 1 in MPEC 2018-X10 -- C/2018 V2
C77Bernezzo Obs. in Italy, 2 in MPECs 2018-X11 & 2018-X14 -- 2018 WJ, 2018 W1
160Castelmartini Obs. in Italy, 1 in MPEC 2018-X11 -- 2018 WJ
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2018-X10 & 2018-X14 -- 2018 W1, C/2018 V2
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-X13 -- C/2018 V4
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2018-X01 -- 2017 RH16
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2018-X10, 2018-X11, 2018-X12 & 2018-X13 -- C/2018 V4, 2018 V3, C/2018 V2, 2018 SA1, 2018 RZ1, 2018 RC8
Z99Clixby Obs. in England, 5 in MPECs 2018-X04, 2018-X06, 2018-X11 & 2018-X14 -- 2018 WJ, 2018 WH2, 2018 WD2, 2018 WC, 2018 W1
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-X14 -- 2018 W1
113Drebach Obs. in Germany, 1 in MPEC 2018-X14 -- 2018 W1
734Farpoint Obs. in Kansas, 1 in MPEC 2018-X12 -- 2018 V3
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2018-X11 & 2018-X14 -- 2018 WC, 2018 W1
X31Galilei Obs., 2 in MPECs 2018-X10 & 2018-X13 -- C/2018 V4, C/2018 V2
K88GINOP-KHK in Hungary, 8 in MPECs 2018-X02, 2018-X03, 2018-X04, 2018-X06, 2018-X10, 2018-X11, 2018-X13 & 2018-X14 -- 2018 WH2, 2018 WD2, 2018 WB2, 2018 WA2, 2018 W1, C/2018 V4, C/2018 V2, 2007 YQ56
E94Gisborne Obs. in New Zealand, 2 in MPECs 2018-X10 & 2018-X13 -- C/2018 V4, C/2018 V2
K73Gravina Obs. in Italy, 1 in MPEC 2018-X11 -- 18109
J95Great Shefford Obs. in England, 10 in MPECs 2018-X04, 2018-X05, 2018-X07, 2018-X08, 2018-X09, 2018-X11 & 2018-X14 -- 2018 WV1, 2018 WM1, 2018 WH1, 2018 WG2, 2018 WG, 2018 WF2, 2018 WE2, 2018 WD2, 2018 WC2, 2018 W1
A17Guidestar Obs. in Germany, 1 in MPEC 2018-X14 -- 2018 W1
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 2 in MPECs 2018-X10 & 2018-X14 -- 2018 W1, C/2018 V2
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-X13 -- C/2018 V4
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 4 in MPECs 2018-X04, 2018-X06, 2018-X10 & 2018-X13 -- 2018 WH2, 2018 WD2, C/2018 V4, C/2018 V2
585Kiev Comet Station in Ukraine, 2 in MPECs 2018-X06 & 2018-X10 -- 2018 WH2, C/2018 V2
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2018-X13 -- C/2018 V4
246KLENOT in the Czech Republic, 2 in MPECs 2018-X10 & 2018-X14 -- 2018 W1, C/2018 V2
K38M57 Obs. in Italy, 2 in MPECs 2018-X06 & 2018-X14 -- 2018 WH2, 2018 W1
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2018-X02, 2018-X03, 2018-X04, 2018-X07, 2018-X08 & 2018-X14 -- 2018 WE2, 2018 WD2, 2018 WC2, 2018 WB2, 2018 WA2, 2018 W1
C10Maisoncelles Obs. in France, 1 in MPEC 2018-X13 -- C/2018 V4
Z22MASTER IAC Obs. in the Canary Islands, 2 in MPEC 2018-X11 -- 140928, 2061
568^R. Wainscoat on Mauna Kea in Hawaii, 2 in MPECs 2018-X11 & 2018-X12 -- 2018 V3, 2014 JO92
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2018-X01 -- 2017 RH16
711McDonald Obs. in Texas, 2 in MPECs 2018-X10 & 2018-X13 -- C/2018 V4, C/2018 V2
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2018-X02, 2018-X03, 2018-X04, 2018-X05, 2018-X06, 2018-X07, 2018-X08, 2018-X09, 2018-X10, 2018-X13 & 2018-X14 -- 2018 WH2, 2018 WG2, 2018 WF2, 2018 WE2, 2018 WD2, 2018 WC2, 2018 WB2, 2018 WA2, 2018 W1, C/2018 V4, C/2018 V2
J69North Obs. in England, 2 in MPECs 2018-X04 & 2018-X06 -- 2018 WH2, 2018 WD2
Z80Northolt Branch Obs. in England, 3 in MPECs 2018-X04, 2018-X06 & 2018-X11 -- 2018 WV1, 2018 WH2, 2018 WD2
I41Palomar Transient Factory (PTF) in southern California, 5 in MPEC 2018-X11 -- 2005 WF57, 86324, 454177, 208565, 152931
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2018-X01 & 2018-X11 -- 2017 RH16, 2014 JO92
F52Pan-STARRS 2 (PS2) in Hawaii, 5 in MPECs 2018-X04, 2018-X10, 2018-X12, 2018-X13 & 2018-X14 -- 2018 WD2, 2018 W1, C/2018 V4, 2018 V3, C/2018 V2
K63Pascoli Obs. in Italy, 4 in MPECs 2018-X10, 2018-X11 & 2018-X14 -- 2018 WF, 2018 WA, 2018 W1, C/2018 V2
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 3 in MPECs 2018-X11 & 2018-X14 -- 2018 WS, 2018 W1, 2013 VE13
W98Polonia Obs. in Chile, 1 in MPEC 2018-X01 -- 2017 RH16
L04ROASTERR-1 in Romania, 3 in MPECs 2018-X04, 2018-X06 & 2018-X14 -- 2018 WH2, 2018 WD2, 2018 W1
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-X14 -- 2018 W1
104San Marcello Pistoiese Obs. in Italy, 4 in MPECs 2018-X04, 2018-X06, 2018-X10 & 2018-X11 -- 2018 WH2, 2018 WF, 2018 WD2, C/2018 V2
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-X02 -- 2018 WA2
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2018-X14 -- 2018 W1
C95SATINO-1 in France, 3 in MPECs 2018-X06, 2018-X11 & 2018-X14 -- 2018 WH2, 2018 W1, 16816
033Schwarzschild Obs. in Germany, 3 in MPECs 2018-X10, 2018-X12 & 2018-X13 -- C/2018 V4, 2018 V3, C/2018 V2
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPECs 2018-X10 & 2018-X13 -- C/2018 V4, C/2018 V2
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 4 in MPECs 2018-X06, 2018-X10, 2018-X13 & 2018-X14 -- 2018 WH2, 2018 W1, C/2018 V4, C/2018 V2
W883B. Lutkenhoner in Germany via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-X10 -- C/2018 V2
587Sormano Obs. in Italy, 2 in MPECs 2018-X10 & 2018-X14 -- 2018 W1, C/2018 V2
L06Sormano2 Obs. in Italy, 1 in MPEC 2018-X14 -- 2018 W1
691Spacewatch 0.9m telescope in Arizona, 3 in MPECs 2018-X10, 2018-X12 & 2018-X13 -- C/2018 V4, 2018 V3, C/2018 V2
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2018-X10, 2018-X11, 2018-X12 & 2018-X13 -- 2018 WD1, C/2018 V4, 2018 V3, C/2018 V2
I52Steward Obs. Mt. Lemmon Station in Arizona, 12 in MPECs 2018-X02, 2018-X03, 2018-X04, 2018-X05, 2018-X06, 2018-X07, 2018-X08, 2018-X09, 2018-X10, 2018-X12, 2018-X13 & 2018-X14 -- 2018 WH2, 2018 WG2, 2018 WF2, 2018 WE2, 2018 WD2, 2018 WC2, 2018 WB2, 2018 WA2, 2018 W1, C/2018 V4, 2018 V3, C/2018 V2
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-X11 -- 2018 VH2
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2018-X01 -- 2017 RH16
K41Vegaquattro Obs. in Italy, 1 in MPEC 2018-X13 -- C/2018 V4
L01Visnjan Obs., 8 in MPECs 2018-X02, 2018-X03, 2018-X04, 2018-X06, 2018-X10, 2018-X12, 2018-X13 & 2018-X14 -- 2018 WH2, 2018 WD2, 2018 WB2, 2018 WA2, 2018 W1, C/2018 V4, 2018 V3, C/2018 V2
718Wiggins Obs. in Utah, 1 in MPEC 2018-X11 -- 2018 WX1
198Wildberg Obs. in Germany, 1 in MPEC 2018-X14 -- 2018 W1
C51WISE in Earth polar orbit, 3 in MPEC 2018-X11 -- 2015 SF20, 418929, 31345
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 December '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 WG2NEODyS16302077-211891.45e-06-8.67-8.88-NEODyS: "Based on 18 optical observations (of which 1 are rejected as outliers) from 2018-11-29.240 to 2018-11-30.734."
JPL Sentry06002078-210321.2327e-06-8.74-8.820JPL: Computed at 21:38 Nov. 30th Pacific time based on 17 observations spanning 1.4827 days (2018-Nov-29.25024 to 2018-Nov-30.732895). Diameter approximately 0.003 km. from weighted mean H=30.13.
2018 WA2NEODyS1630211026.06e-10-8.51-8.560NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2018-11-28.392 to 2018-11-30.893."
JPL Sentry06002110-211737.357e-10-8.42-8.570JPL: Computed at 21:03 Nov. 30th Pacific time based on 26 observations spanning 2.5008 days (2018-Nov-28.3915 to 2018-Nov-30.89235). Diameter approximately 0.088 km. from weighted mean H=22.93.
2018 WZ1NEODyS1630203411.98e-07-8.24-8.240NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2018-11-28.369 to 2018-11-30.237."
2018 WV1JPL Sentry16302085-2118249.023441e-05-6.99-7.650JPL: Computed at 07:29 today Pacific time based on 38 observations spanning 1.6867 days (2018-Nov-29.23429 to 2018-Nov-30.92103). Diameter approximately 0.003 km. from weighted mean H=30.13.
NEODyS16302053-2117637.88e-05-6.97-7.160NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2018-11-29.235 to 2018-11-30.044."
2018 WR1NEODyS16302081-210421.36e-08-5.50-5.540NEODyS: "Based on 28 optical observations (of which 1 are rejected as outliers) from 2018-11-27.326 to 2018-11-29.945."
2018 WH1JPL Sentry16302067-2113151.2219831e-05-7.01-7.850JPL: Computed at 07:18 today Pacific time based on 52 observations spanning 3.6546 days (2018-Nov-27.25828 to 2018-Nov-30.912906). Diameter approximately 0.007 km. from weighted mean H=28.44.
2018 WJJPL Sentry16302045-205529.487e-07-6.87-7.140JPL: Computed at 07:21 today Pacific time based on 78 observations spanning 2.6420 days (2018-Nov-17.26735 to 2018-Nov-19.909366). Diameter approximately 0.010 km. from weighted mean H=27.62.
2018 VCNEODyS16302106-2118188.76e-06-6.17-6.48-NEODyS: "Based on 136 optical observations (of which 0 are rejected as outliers) from 2018-11-01.250 to 2018-11-28.386."
2017 RH16JPL Sentry0700R E M O V E DJPL: Risk listing removed at 0619 UTC today
2016 JT38NEODyS16302019-21031224.09e-09-5.74-6.590NEODyS: "Based on 8 optical observations (of which 0 are rejected as outliers) from 2016-05-04.265 to 2016-05-05.307."

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 1 December '18

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

2004Grabbed MPEC 2018-X14 - A/2018 W1 - see above
1950Generated Traffic Report
1903Grabbed MPEC 2018-X13 - Comet C/2018 V4 (Africano) - see above
1800Grabbed MPEC 2018-X12 - A/2018 V3 - see above
1630Noted that NEODyS has updated its 2016 JT38 risk assessment - see above
Noted that NEODyS has updated its 2018 VC risk assessment - see above
Noted that NEODyS has posted 2018 WA2 as an impact risk - see above
Noted that NEODyS has posted 2018 WG2 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 WH1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 WJ risk assessment - see above
Noted that NEODyS has posted 2018 WR1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 WV1 risk assessment - see above
Noted that NEODyS has posted 2018 WV1 as an impact risk - see above
Noted that NEODyS has posted 2018 WZ1 as an impact risk - see above
Grabbed MPEC 2018-X11 - Daily Orbit Update - see above
0700Noted that JPL Sentry has removed 2017 RH16 as an impact risk - see above
0600Noted that JPL Sentry has posted 2018 WA2 as an impact risk - see above
Noted that JPL Sentry has posted 2018 WG2 as an impact risk - see above
Grabbed MPEC 2018-X01 - 2017 RH16 - see above
Grabbed MPEC 2018-X02 - 2018 WA2 - see above
Grabbed MPEC 2018-X03 - 2018 WB2 - see above
Grabbed MPEC 2018-X04 - 2018 WD2 - see above
Grabbed MPEC 2018-X05 - 2018 WF2 - see above
Grabbed MPEC 2018-X06 - 2018 WH2 - see above
Grabbed MPEC 2018-X07 - 2018 WC2 - see above
Grabbed MPEC 2018-X08 - 2018 WE2 - see above
Grabbed MPEC 2018-X09 - 2018 WG2 - see above
Grabbed MPEC 2018-X10 - Comet C/2018 V2 (ATLAS) - see above