Contents  on 4 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 4 December '18

Ten objects reported inside ten LD

Bulletin - 2249, updated 2333 UTC:  Six new discoveries of close passers have been announced.

Earth passageI D~Size~Inside ten LDNotes
0.84 LD at 0411 UTC Nov. 282018 WA39 m Nov. 25 - Dec. 1intruder, risk - MPEC
2.06 LD at 1419 UTC yesterday2018 XB7 m Nov. 26 - Dec. 11MPEC
3.77 LD at 0651 UTC Dec. 72018 XG15 m Dec. 2 - 12MPEC
5.71 LD at 1332 UTC Dec. 12018 XE28 m Nov. 26 - Dec. 6MPEC
6.45 LD at 0253 UTC Dec. 12018 XC21 m Nov. 28 - todayMPEC
7.84 LD at 1726 UTC Dec. 22018 XF23 m Nov. 29 - Dec. 6MPEC


Ten minor objects are reported within ten lunar distances (LD) of our planet today. The nearest is inside Earth's sphere of gravitational influence and has been since November 27th. Outbound risk-listed intruder 2018 WV1 moves away from 1.07 to 1.53 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 Dec. 2 2018 WV1 3 m  1.07 to 1.53 LD Nov. 8 - Dec. 25 intruder, NHATS target, inside Earth SOI, risk - DOU
0.52 LD Nov. 30 2018 WG2 3 m  4.73 to 6.18 LD Nov. 23 - Dec. 7 intruder, NHATS target, risk
1.18 LD Nov. 25 2018 WH1 7 m  7.48 to 8.38 LD Nov. 15 - Dec. 6 Moon buzzer, NHATS target, risk - DOU
2.62 LD Dec. 15 2018 VO9 14 m  7.03 from 7.60 LD Nov. 29 - Dec. 31 NHATS target, risk - DOU
2.76 LD Dec. 1 2018 WF2 7 m  6.95 to 9.36 LD Nov. 27 - tomorrow
3.42 LD today 2018 WD2 21 m  3.42 LD Nov. 29 - Dec. 10 Earth closest at 2112 UTC - DOU
3.92 LD Dec. 2 2018 TG6 12 m  3.94 to 3.98 LD Oct. 30 - Jan. 5 NHATS target
4.1   LD Dec. 9* 2013 VX4 62 m  8.1 from 9.4 LD yesterday - Dec. 15 EPU +/- 2.35 days*
4.82 LD Dec. 7 2018 WX1 52 m  6.81 from 8.36 LD yesterday - Dec. 11 NHATS target - DOU
8.21 LD Nov. 25 2018 VT7 9 m  9.20 to 9.43 LD Nov. 15 - Dec. 7 NHATS target
* EPU = Earth passage uncertainty

This report was generated at 2010 UTC with follow-up in today's DOU MPEC for half of the objects in the above active traffic table and for six departed objects: 2018 WT1, 2018 UC2, 2008 WD14, and including three risk-listed objects: 2018 XA, 2018 TP5, and intruder 2018 WE1, plus observation of intruder 2012 TC4 from October of last year.
        We should note 2018 VX8 (MPEC), an object perhaps a hundred meters wide that is not a close passer this year but will be back next May for a visit. It was last reported observed November 28th and is now moving away, getting dimmer.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
7.84 LD Dec. 10 2001 XG1 74 m  18.04 from 21.00 LD Dec. 8 - 12
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  24.46 from 25.72 LD Dec. 17 - 26 radar/NHATS target
7.3   LD Jan. 9* 2013 YM2 19 m  35.0 from 35.9 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 4 December '18

The MPC's NEO Confirmation Page has 45 listings

When last checked at 2332 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 45 objects listed. Of these, 30 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 4 December '18

Minor Planet Electronic Circulars

As of last check at 2332 UTC, there have been sixteen MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-X40 - "22:38 UT" - 2018 XB


MPEC 2018-X39 - "22:33 UT" - 2018 XD


MPEC 2018-X38 - "22:23 UT" - 2018 XG


MPEC 2018-X37 - "22:19 UT" - 2018 XF


MPEC 2018-X36 - "22:15 UT" - 2018 XE


MPEC 2018-X35 - "22:11 UT" - 2018 XC


MPEC 2018-X34 - "22:08 UT" - 2018 WB3


MPEC 2018-X33 - "22:05 UT" - 2018 WA3


MPEC 2018-X32 - "22:01 UT" - 2018 WZ2


MPEC 2018-X31 - "21:57 UT" - 2018 WY2


MPEC 2018-X30 - "21:54 UT" - 2018 WX2


MPEC 2018-X29 - "21:50 UT" - 2018 WW2


MPEC 2018-X28 - "21:47 UT" - 2018 WV2


<< DOU on 4 Dec. '18 >>  MPEC 2018-X27 - "13:06 UT" - Daily Orbit Update


MPEC 2018-X26 - "03:39 UT" - 2017 BG32


MPEC 2018-X25 - "03:38 UT" - 2017 BP5

Observers  on 4 December '18

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 11 in MPECs 2018-X25, 2018-X27, 2018-X36 & 2018-X37 -- 2018 XF, 2018 XE, 2018 XA, 2018 WX1, 2018 WT1, 2018 WH2, 2018 TS, 2017 BP5, 2015 MQ101, 2008 WD14, 518735
T08ATLAS Mauna Loa in Hawaii, 7 in MPECs 2018-X27, 2018-X37, 2018-X39 & 2018-X40 -- 2018 XF, 2018 XD, 2018 XB, 2018 XA, 2018 VX6, 2008 WD14, 2002 XC91
160Castelmartini Obs. in Italy, 1 in MPEC 2018-X36 -- 2018 XE
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2018-X33 & 2018-X38 -- 2018 XG, 2018 WA3
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2018-X27 -- 2018 TP5
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2018-X26 & 2018-X27 -- 2018 UC2, 2018 SQ3, 2018 RA7, 2017 BG32
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 22 in MPECs 2018-X27, 2018-X28, 2018-X29, 2018-X31, 2018-X32, 2018-X33, 2018-X35, 2018-X36, 2018-X37 & 2018-X39 -- 2018 XF, 2018 XE, 2018 XD, 2018 XC, 2018 XA, 2018 WZ2, 2018 WY2, 2018 WW2, 2018 WV2, 2018 WV1, 2018 WS1, 2018 WR1, 2018 WC2, 2018 WA3, 2018 WA2, 2018 VY7, 2018 VY, 2018 VL7, 2018 VA10, 2018 TU1, 2017 BG32, 152564
X31Galilei Obs., 1 in MPEC 2018-X39 -- 2018 XD
E94Gisborne Obs. in New Zealand, 1 in MPEC 2018-X39 -- 2018 XD
J95Great Shefford Obs. in England, 8 in MPECs 2018-X25, 2018-X27, 2018-X33, 2018-X35, 2018-X36, 2018-X37 & 2018-X40 -- 2018 XF, 2018 XE, 2018 XC, 2018 XB, 2018 XA, 2018 WV1, 2018 WA3, 2017 BP5
L32Korea Microlensing Telescope Network SAAO in South Africa, 1 in MPEC 2018-X27 -- 2012 TC4
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2018-X28, 2018-X29, 2018-X30 & 2018-X38 -- 2018 XG, 2018 WX2, 2018 WW2, 2018 WV2
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2018-X28, 2018-X29, 2018-X30, 2018-X31, 2018-X32, 2018-X33 & 2018-X34 -- 2018 WZ2, 2018 WY2, 2018 WX2, 2018 WW2, 2018 WV2, 2018 WB3, 2018 WA3
J69North Obs. in England, 2 in MPEC 2018-X27 -- 2018 WX1, 2018 WD2
Z80Northolt Branch Obs. in England, 4 in MPECs 2018-X27, 2018-X36 & 2018-X37 -- 2018 XF, 2018 XE, 2018 XA, 2018 WX1
I41Palomar Transient Factory (PTF) in southern California, 4 in MPECs 2018-X27, 2018-X35, 2018-X37 & 2018-X40 -- 2018 XF, 2018 XC, 2018 XB, 2018 VZ9
K63Pascoli Obs. in Italy, 3 in MPECs 2018-X36, 2018-X38 & 2018-X39 -- 2018 XG, 2018 XE, 2018 XD
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2018-X36 -- 2018 XE
104San Marcello Pistoiese Obs. in Italy, 6 in MPECs 2018-X33, 2018-X35, 2018-X36, 2018-X37, 2018-X38 & 2018-X39 -- 2018 XG, 2018 XF, 2018 XE, 2018 XD, 2018 XC, 2018 WA3
C95SATINO-1 in France, 1 in MPEC 2018-X27 -- 1620
G40'program code "'" (16) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-X27 -- 2018 WX1
I33SOAR in Chile, 1 in MPEC 2018-X27 -- 2018 WV1
587Sormano Obs. in Italy, 6 in MPECs 2018-X30, 2018-X35, 2018-X36, 2018-X37, 2018-X38 & 2018-X39 -- 2018 XG, 2018 XF, 2018 XE, 2018 XD, 2018 XC, 2018 WX2
691Spacewatch 0.9m telescope in Arizona, 24 in MPEC 2018-X27 -- 2018 WW1, 2018 WP, 2018 WE1, 2018 VZ3, 2018 VX6, 2018 VS, 2018 VN5, 2018 VH1, 2018 UN1, 2018 TY2, 2018 TL2, 2018 TK2, 2018 RP8, 2018 NU3, 2018 MW6, 2018 LB1, 2018 FJ4, 2016 KE, 2016 CX264, 2015 XC1, 2010 GT7, 2009 BJ58, 2002 XC91, 2002 AD2
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2018-X27 -- 2018 WH1, 2018 VO9, 2018 UY, 2018 TO1, 2018 TM6, 2018 JA
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-X36 -- 2018 XE
I52Steward Obs. Mt. Lemmon Station in Arizona, 38 in MPECs 2018-X27, 2018-X28, 2018-X29, 2018-X30, 2018-X31, 2018-X32, 2018-X33, 2018-X35, 2018-X36, 2018-X37, 2018-X38 & 2018-X39 -- 2018 XG, 2018 XF, 2018 XE, 2018 XD, 2018 XC, 2018 XA, 2018 WZ2, 2018 WY2, 2018 WX2, 2018 WX1, 2018 WW2, 2018 WW1, 2018 WV2, 2018 WV1, 2018 WU1, 2018 WP2, 2018 WO2, 2018 WM2, 2018 WL2, 2018 WH2, 2018 WE2, 2018 WE1, 2018 WC2, 2018 WC1, 2018 WA3, 2018 VZ9, 2018 VZ1, 2018 VX, 2018 VW6, 2018 VU6, 2018 VT8, 2018 VS9, 2018 VQ3, 2018 VN5, 2018 UN1, 2018 SX2, 2018 ND1, 2018 MW6
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-X27 -- 2018 SZ2, 2018 RL6
L01Visnjan Obs., 9 in MPECs 2018-X28, 2018-X29, 2018-X33, 2018-X34, 2018-X35, 2018-X36, 2018-X37, 2018-X38 & 2018-X39 -- 2018 XG, 2018 XF, 2018 XE, 2018 XD, 2018 XC, 2018 WW2, 2018 WV2, 2018 WB3, 2018 WA3
C51WISE in Earth polar orbit, 4 in MPEC 2018-X27 -- 2015 SF20, 418929, 31345, 5797
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 December '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2332 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 XAJPL Sentry17102099-209923.18e-07-5.91-6.080JPL: Computed at 08:00 today Pacific time based on 78 observations spanning 2.7470 days (2018-Dec-01.34686 to 2018-Dec-04.0939). Diameter approximately 0.068 km. from weighted mean H=23.49.
2018 WA3JPL Sentry23322055-206022.80616e-06-6.63-6.640JPL: Computed at 15:29 today Pacific time based on 24 observations spanning 3.7403 days (2018-Nov-29.26148 to 2018-Dec-03.001792). Diameter approximately 0.009 km. from weighted mean H=27.81.
2018 WA2JPL Sentry1710R E M O V E DJPL: Risk listing removed at 1601 UTC today
NEODyS1710R E M O V E D-
2018 WH1JPL Sentry17102076-2112159.541063e-06-7.13-7.960JPL: Computed at 08:04 today Pacific time based on 57 observations spanning 6.9651 days (2018-Nov-27.25828 to 2018-Dec-04.22339). Diameter approximately 0.007 km. from weighted mean H=28.46.
2018 WE1JPL Sentry17102063-210251.64595e-06-6.25-6.600JPL: Computed at 08:06 today Pacific time based on 66 observations spanning 7.8609 days (2018-Nov-26.46885 to 2018-Dec-04.32974). Diameter approximately 0.022 km. from weighted mean H=25.95.
2018 VO9JPL Sentry17102102-211087.74568e-05-5.56-5.830JPL: Computed at 07:51 today Pacific time based on 29 observations spanning 24.802 days (2018-Nov-09.26967 to 2018-Dec-04.07209). Diameter approximately 0.014 km. from weighted mean H=26.99.
2018 TP5JPL Sentry17102074-2105251.906981e-05-5.23-5.840JPL: Computed at 07:44 today Pacific time based on 38 observations spanning 53.735 days (2018-Oct-10.3155 to 2018-Dec-03.050513). Diameter approximately 0.025 km. from weighted mean H=25.66.

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 4 December '18

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

2332Noted that JPL Sentry has posted 2018 WA3 as an impact risk - see above
2246Grabbed MPEC 2018-X28 - 2018 WV2 - see above
Grabbed MPEC 2018-X29 - 2018 WW2 - see above
Grabbed MPEC 2018-X30 - 2018 WX2 - see above
Grabbed MPEC 2018-X31 - 2018 WY2 - see above
Grabbed MPEC 2018-X32 - 2018 WZ2 - see above
Grabbed MPEC 2018-X33 - 2018 WA3 - see above
Grabbed MPEC 2018-X34 - 2018 WB3 - see above
Grabbed MPEC 2018-X35 - 2018 XC - see above
Grabbed MPEC 2018-X36 - 2018 XE - see above
Grabbed MPEC 2018-X37 - 2018 XF - see above
Grabbed MPEC 2018-X38 - 2018 XG - see above
Grabbed MPEC 2018-X39 - 2018 XD - see above
Grabbed MPEC 2018-X40 - 2018 XB - see above
2010Generated Traffic Report
1710Noted that JPL Sentry has updated its 2018 TP5 risk assessment - see above
Noted that JPL Sentry has updated its 2018 VO9 risk assessment - see above
Noted that JPL Sentry has removed 2018 WA2 as an impact risk - see above
Noted that NEODyS has removed 2018 WA2 as an impact risk - 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 updated its 2018 XA risk assessment - see above
Grabbed MPEC 2018-X27 - Daily Orbit Update - see above
0550Grabbed MPEC 2018-X25 - 2017 BP5 - see above
Grabbed MPEC 2018-X26 - 2017 BG32 - see above