Contents  on 24 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 24 November '18

Six objects reported inside ten LD

Six small visitors are reported inside ten lunar distances (LD) of our home world today. Nearest are 2018 TG6, inbound from 4.60 to 4.46 LD, and 2018 WD, which comes its closest to Earth this time around -- 4.52 LD at 0940 UTC.

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  6.65 to 7.27 LD Oct. 29 - Nov. 29 intruder, NHATS target, risk
3.92 LD Dec. 2 2018 TG6 12 m  4.46 from 4.60 LD Oct. 30 - Jan. 5 NHATS target
4.52 LD today 2018 WD 47 m  4.52 LD Nov. 21 - 27 Earth closest at 0940 UTC - DOU
7.4   LD Nov. 27* 2008 WD14 89 m  8.5 from 9.7 LD yesterday - Nov. 30 EPU +/- 2.04 days*
7.63 LD Nov. 20 2018 VP7 16 m  8.94 to 9.67 LD Nov. 15 - 25 NHATS target
8.21 LD tomorrow 2018 VT7 9 m  8.22 from 8.26 LD Nov. 15 - Dec. 7 NHATS target
* EPU = Earth passage uncertainty

This report was generated at 2035 UTC with follow-up in today's DOU MPEC for passing 2018 WD, departed 2018 VD and 2018 TZ5, and distant 2013 UG and 68216 2001 CV26.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
2.6   LD Dec. 15* 2018 VO9 15 m  12.7 from 13.3 LD Nov. 29 - Dec. 31 EPU +/- 1.28 hours*, NHATS target, risk
4.1   LD Dec. 9* 2013 VX4 62 m  22.0 from 23.4 LD Dec. 3 - 15 EPU +/- 2.35 days*
7.84 LD Dec. 10 2001 XG1 74 m  49.86 from 53.23 LD Dec. 8 - 12
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  36.91 from 38.12 LD Dec. 17 - 26 radar/NHATS target
7.3   LD Jan. 9* 2013 YM2 19 m  43.9 from 44.7 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. "Distant" is used here to describe objects that have approached Earth within ten LD since A/CC began these traffic reports eleven-plus years ago but are not presently coming so close. 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 24 November '18

The MPC's NEO Confirmation Page has 14 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fourteen objects listed. Of these, six were "one nighters." So far The Tracking News has counted a total of sixteen 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 24 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 24 Nov. '18 >>  MPEC 2018-W51 - "13:06 UT" - Daily Orbit Update

Observers  on 24 November '18

Ten observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPEC 2018-W51 -- 2018 VD, 2018 UG1, 2018 TZ5, 2018 TW4, 2018 TV2, 2018 TR2, 2018 TQ, 2018 SV3, 2018 RR8, 2018 RC8, 2018 QV1, 2018 CO2, 2016 HM2, 2014 HR124, 2013 SO20, 85938, 523823, 153951
T05ATLAS Haleakala in Hawaii, 21 in MPEC 2018-W51 -- 2011 WA, 96315, 88263, 54401, 457212, 455550, 443923, 442742, 414960, 413002, 20790, 17274, 16834, 162004, 155334, 140928, 12711, 6456, 5797, 5143, 3691
T08ATLAS Mauna Loa in Hawaii, 20 in MPEC 2018-W51 -- 2001 VC2, 99799, 68216, 54660, 518735, 518463, 516803, 468481, 418929, 37336, 25916, 217807, 180186, 138852, 4954, 4953, 4401, 1916, 1627, 719
W93Korea Microlensing Telescope Network CTIO in Chile, 1 in MPEC 2018-W51 -- 253841
L09LCO Sutherland Aqawan A#1 in South Africa, 1 in MPEC 2018-W51 -- 2018 WD
G96Mt. Lemmon Survey (MLS) in Arizona, 29 in MPEC 2018-W51 -- 2015 XQ55, 2015 XE352, 2015 UC67, 2014 TW32, 2013 WR43, 2013 UG1, 2012 VM6, 2007 TD14, 88263, 85774, 68063, 523823, 515049, 442742, 431394, 413002, 381677, 337866, 30825, 283729, 25143, 226514, 163902, 163051, 161995, 155334, 137427, 3288, 2061
F52Pan-STARRS 2 (PS2) in Hawaii, 12 in MPEC 2018-W51 -- 2018 FJ4, 2011 UA, 65996, 54401, 515049, 478574, 436116, 414772, 354713, 213869, 170891, 155140
C95SATINO-1 in France, 1 in MPEC 2018-W51 -- 154656
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2018-W51 -- 2001 RA18, 163250
C51WISE in Earth polar orbit, 2 in MPEC 2018-W51 -- 520808, 137805
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 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 WA1NEODyS17002054-21171013.55e-05-7.29-7.810NEODyS: "Based on 15 optical observations (of which 1 are rejected as outliers) from 2018-11-16.061 to 2018-11-22.190."

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 24 November '18

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

2035Generated Traffic Report
1700Noted that NEODyS has posted 2018 WA1 as an impact risk - see above
Grabbed MPEC 2018-W51 - Daily Orbit Update - see above