Contents  on 25 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 25 November '18

Six objects reported inside ten LD

There are six small celestial objects reported inside ten lunar distances (LD) of Earth today. Nearest are 2018 TG6, inbound from 4.46 to 4.34 LD, and 2018 WD, outbound from 4.88 to 6.65 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  7.27 to 7.89 LD Oct. 29 - Nov. 29 intruder, NHATS target, risk
3.92 LD Dec. 2 2018 TG6 12 m  4.34 from 4.46 LD Oct. 30 - Jan. 5 NHATS target
4.52 LD yesterday 2018 WD 47 m  4.88 to 6.65 LD Nov. 21 - 27
7.4   LD Nov. 27* 2008 WD14 89 m  7.7 from 8.5 LD Nov. 23 - 30 EPU +/- 2.04 days*
7.63 LD Nov. 20 2018 VP7 16 m  9.67 to 10.50 LD Nov. 15 - 25 NHATS target, exits ten LD
8.21 LD today 2018 VT7 9 m  8.21 LD Nov. 15 - Dec. 7 NHATS target, Earth closest at 1722 UTC
* EPU = Earth passage uncertainty

This report was generated at 2211 UTC with today's DOU MPEC carrying observations for six departed close passers: 2018 WV, 2018 WU, intruder 2018 VO5, and including risk-listed objects 2018 TB and intruders 2018 WJ and 2018 VT5 (3.41 days added to 2.95-day observing arc).

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  12.2 from 12.7 LD Nov. 29 - Dec. 31 EPU +/- 1.28 hours*, NHATS target, risk
4.1   LD Dec. 9* 2013 VX4 62 m  20.6 from 22.0 LD Dec. 3 - 15 EPU +/- 2.35 days*
7.84 LD Dec. 10 2001 XG1 74 m  46.52 from 49.86 LD Dec. 8 - 12
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  35.69 from 36.91 LD Dec. 17 - 26 radar/NHATS target
7.3   LD Jan. 9* 2013 YM2 19 m  43.0 from 43.9 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 25 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."

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 25 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 25 Nov. '18 >>  MPEC 2018-W52 - "13:05 UT" - Daily Orbit Update

Observers  on 25 November '18

Fourteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2018-W52 -- 2018 RY, 2018 QW, 2018 QR, 2018 QQ1, 2018 PK21, 2018 NR, 2018 NO1, 2016 XD1, 97725, 276468, 256670, 232382, 142555
U63Burnt Tree Hill Obs., 1 in MPEC 2018-W52 -- 2011 AA37
J95Great Shefford Obs. in England, 1 in MPEC 2018-W52 -- 2018 WJ
Q67JBL Obs., 1 in MPEC 2018-W52 -- 99799
L32Korea Microlensing Telescope Network SAAO in South Africa, 1 in MPEC 2018-W52 -- 137044
C41MASTER-II Kislovodsk in Russia, 1 in MPEC 2018-W52 -- 86324
711McDonald Obs. in Texas, 2 in MPEC 2018-W52 -- 2018 UM1, 2018 TY2
V01Mountainville Obs. in Utah, 2 in MPEC 2018-W52 -- 17274, 6456
J69North Obs. in England, 2 in MPEC 2018-W52 -- 2018 WV, 2018 WU
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-W52 -- 283729
C95SATINO-1 in France, 1 in MPEC 2018-W52 -- 170891
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2018-W52 -- 2018 VU6, 2018 VN5, 2018 UY
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-W52 -- 2018 VT5, 2018 TB
L01Visnjan Obs., 1 in MPEC 2018-W52 -- 2018 VO5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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.





Notes for Today's Latest Risk Assessments
2018 WJNEODyS22002045-209679.58e-07-6.91-7.30NEODyS: "Based on 67 optical observations (of which 0 are rejected as outliers) from 2018-11-17.268 to 2018-11-19.910."
JPL Sentry20002045-205531.2058e-06-6.75-7.100JPL: Computed at 07:11 today Pacific time based on 67 observations spanning 2.6420 days (2018-Nov-17.26735 to 2018-Nov-19.909366). Diameter approximately 0.010 km. from weighted mean H=27.56.
2018 VT5NEODyS22002078-2118874.36e-05-6.34-6.83-NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2018-11-08.275 to 2018-11-14.642."
JPL Sentry20002085-2117393.5737455e-05-6.40-6.710JPL: Computed at 07:10 today Pacific time based on 20 observations spanning 6.3673 days (2018-Nov-08.27373 to 2018-Nov-14.641033). Diameter approximately 0.007 km. from weighted mean H=28.44.
2018 TBNEODyS2200210311.68e-06-6.02-6.020NEODyS: "Based on 197 optical observations (of which 1 are rejected as outliers) from 2018-10-02.423 to 2018-11-19.459."
JPL Sentry20002103-210311.229e-06-6.14-6.140JPL: Computed at 07:07 today Pacific time based on 191 observations spanning 48.036 days (2018-Oct-02.42196 to 2018-Nov-19.45773). Diameter approximately 0.037 km. from weighted mean H=24.82.

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 25 November '18

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

2211Generated Traffic Report
2200Noted that NEODyS has updated its 2018 TB risk assessment - see above
Noted that NEODyS has updated its 2018 VT5 risk assessment - see above
Noted that NEODyS has updated its 2018 WJ risk assessment - see above
2000Noted that JPL Sentry has updated its 2018 TB risk assessment - see above
Noted that JPL Sentry has updated its 2018 VT5 risk assessment - see above
Noted that JPL Sentry has updated its 2018 WJ risk assessment - see above
Grabbed MPEC 2018-W52 - Daily Orbit Update - see above