Contents  on 26 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 26 November '18

Five objects reported inside ten LD

Five asteroids are being tracked inside ten lunar distances (LD) of our planet today. Nearest is 2018 TG6, which inches inward from 4.34 to 4.23 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  7.89 to 8.51 LD Oct. 29 - Nov. 29 intruder, NHATS target, risk
3.92 LD Dec. 2 2018 TG6 12 m  4.23 from 4.34 LD Oct. 30 - Jan. 5 NHATS target - DOU
4.52 LD Nov. 24 2018 WD 47 m  6.65 to 9.12 LD Nov. 21 - 27 DOU
7.4   LD tomorrow* 2008 WD14 89 m  7.4 from 7.7 LD Nov. 23 - 30 EPU +/- 2.04 days*
8.21 LD yesterday 2018 VT7 9 m  8.21 to 8.23 LD Nov. 15 - Dec. 7 NHATS target - DOU
* EPU = Earth passage uncertainty

This report was generated at 1854 UTC with observations in today's DOU MPEC for risk-listed approaching 2018 VO9 (first follow-up, 10.92 days added to 5.94-day discovery arc), inbound 2018 TG6, outbound 2018 WD and 2018 VT7, and departed 2018 WU, plus astrometry for 2018 VW4 from earlier this month.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
2.62 LD Dec. 15 2018 VO9 15 m  11.61 from 12.19 LD Nov. 29 - Dec. 31 NHATS target, risk - DOU
4.1   LD Dec. 9* 2013 VX4 62 m  19.1 from 20.6 LD Dec. 3 - 15 EPU +/- 2.35 days*
7.84 LD Dec. 10 2001 XG1 74 m  43.20 from 46.52 LD Dec. 8 - 12
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  34.47 from 35.69 LD Dec. 17 - 26 radar/NHATS target
7.3   LD Jan. 9* 2013 YM2 19 m  42.1 from 43.0 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 26 November '18

The MPC's NEO Confirmation Page has 18 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of nineteen 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 26 November '18

Minor Planet Electronic Circulars

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


<< DOU on 26 Nov. '18 >>  MPEC 2018-W53 - "13:06 UT" - Daily Orbit Update

Observers  on 26 November '18

Eighteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPEC 2018-W53 -- 2018 WD, 2018 VT6, 2018 VL5, 2018 VA5, 2018 PS23, 2018 PL23, 2018 PG21, 2018 OT, 2018 NV1, 2018 NR4, 2018 NJ1, 2018 MY4, 2018 MU4, 2018 LC16, 2017 KP34, 523632, 363163
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2018-W53 -- 2018 RL, 2010 GT7
160Castelmartini Obs. in Italy, 1 in MPEC 2018-W53 -- 523587
703Catalina Sky Survey (CSS) in Arizona, 17 in MPEC 2018-W53 -- 2015 MQ101, 54401, 52387, 523604, 523587, 457260, 454177, 450779, 42286, 422787, 409204, 170891, 16816, 141498, 3691, 3200, 1620
E94Gisborne Obs. in New Zealand, 2 in MPEC 2018-W53 -- 162687, 4953
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-W53 -- 2018 WU
C41MASTER-II Kislovodsk in Russia, 1 in MPEC 2018-W53 -- 86324
474Mt. John Obs. in New Zealand, 1 in MPEC 2018-W53 -- 2009 WL6
G96Mt. Lemmon Survey (MLS) in Arizona, 20 in MPEC 2018-W53 -- 2015 UC67, 2014 XR6, 2011 KN9, 2005 TR45, 2001 SR263, 52768, 523621, 523610, 436654, 215188, 20790, 17274, 159929, 154330, 153591, 9058, 7358, 5797, 5143, 5131
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2018-W53 -- 1916
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2018-W53 -- 1916
I41Palomar Transient Factory (PTF) in southern California, 6 in MPEC 2018-W53 -- 2018 WD, 454177, 409204, 21088, 137805, 1620
F52Pan-STARRS 2 (PS2) in Hawaii, 7 in MPEC 2018-W53 -- 2013 XH4, 436654, 39796, 31210, 20460, 163081, 5131
C95SATINO-1 in France, 1 in MPEC 2018-W53 -- 208617
691Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2018-W53 -- 2018 VW1, 2018 VN5, 2018 UN1, 2018 TY2, 2018 TX4, 2018 TO1, 2018 TK2, 2018 TC3, 2018 FJ4
291Spacewatch 1.8m telescope in Arizona, 11 in MPEC 2018-W53 -- 2018 WP, 2018 VX6, 2018 VT7, 2018 VO9, 2018 VK5, 2018 VE4, 2018 UY, 2018 TG6, 2018 LB1, 2017 WG2, 2013 VA10
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPEC 2018-W53 -- 2018 VW4, 2018 VP5
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-W53 -- 2018 UA1, 523593
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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 WPJPL Sentry1700R E M O V E DJPL: Risk listing removed at 1500 UTC today
NEODyS1700209816.44e-09-5.81-5.810NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2018-11-17.398 to 2018-11-26.488."
2018 VO9JPL Sentry17002098-2110190.00022894961-5.00-5.450JPL: Computed at 07:04 today Pacific time based on 17 observations spanning 16.855 days (2018-Nov-09.26967 to 2018-Nov-26.12507). Diameter approximately 0.015 km. from weighted mean H=26.81.
NEODyS17002098-2117255.49e-05-5.65-5.950NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2018-11-09.270 to 2018-11-26.126."

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 26 November '18

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

1854Generated Traffic Report
1700Noted that JPL Sentry has updated its 2018 VO9 risk assessment - see above
Noted that NEODyS has updated its 2018 VO9 risk assessment - see above
Noted that JPL Sentry has removed 2018 WP as an impact risk - see above
Noted that NEODyS has updated its 2018 WP risk assessment - see above
Grabbed MPEC 2018-W53 - Daily Orbit Update - see above