Contents  on 26 October '18

NOTE:  These A/CC news pages will update less often for a few days. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP efforts, and there may be some days without a traffic report for Earth's Busy Neighborhood.

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 October '18

Four objects reported inside ten LD

Four asteroids are reported inside ten lunar distances (LD) of Earth today, none of them closer than 7.19 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
2.29 LD Oct. 21 2018 US1 13 m  7.19 to 8.70 LD Oct. 15 - 27 NHATS target
5.17 LD Oct. 11 2018 TS4 11 m  8.94 to 9.33 LD Sept. 25 - Oct. 28 NHATS target
5.31 LD Oct. 24 2018 UH1 33 m  7.46 to 9.73 LD Oct. 21 - 27
5.38 LD Oct. 30 2018 UC 21 m  9.49 from 11.29 LD today - Nov. 3 NHATS target, enters ten LD

This report was generated at 1910 UTC with follow-up in today's DOU MPEC for approaching 2018 TG6 and departed objects 2018 UC2, 2018 UF1, and 2018 UE1. The DOU yesterday has follow-up for approaching objects 2018 UQ1 and 475534 2006 TS7, outbound 2018 US1, departed 2018 UC2, and distant 2013 UG1, plus astrometry from 2014 for 2014 HS197. Additionally, we were able to obtain the JPL Horizons data we needed to fully update the passages of receding objects 2018 UH1 and 2018 UE1.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
7.51 LD Oct. 29 475534 2006 TS7 195 m  12.64 from 16.09 LD tomorrow - Oct. 31
3.9   LD Dec. 2* 2018 TG6 12 m  10.9 from 11.2 LD Oct. 30 - Jan. 5 EPU +/- 21 mins.*, NHATS target, risk - DOU
7.4   LD Nov. 4* 2018 UY1 53 m  18.4 from 20.1 LD Nov. 1 - 8 EPU +/- 36 mins.*, NHATS target
7.77 LD Nov. 5 2018 TF3 288 m  46.08 from 50.76 LD Nov. 4 - 7
9.4   LD Nov. 13* 2018 UQ1 144 m  52.1 from 55.1 LD Nov. 12 - 15 EPU +/- 1.45 hours*
7.4   LD Nov. 27* 2008 WD14 89 m  62.5 from 64.3 LD Nov. 23 - 30 EPU +/- 2.04 days*
4.1   LD Dec. 9* 2013 VX4 62 m  60.4 from 61.7 LD Dec. 3 - 15 EPU +/- 2.35 days*
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  66.99 from 67.78 LD Dec. 17 - 26 NHATS target
7.3   LD Jan. 9* 2013 YM2 19 m  64.2 from 64.7 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 26 October '18

The MPC's NEO Confirmation Page has 14 listings

When last checked at 2312 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fourteen objects listed. Of these, eight were "one nighters."

New MPECs  on 26 October '18

Minor Planet Electronic Circulars

There were three MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-U73 - "23:26 UT" - 2016 YZ


MPEC 2018-U72 - "23:24 UT" - 2015 WN2


<< DOU on 26 Oct. '18 >>  MPEC 2018-U71 - "12:12 UT" - Daily Orbit Update

Observers  on 26 October '18

Eight observers appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2018-U71 -- 2018 UC2, 2018 TQ2, 2018 SR3, 2018 RZ2, 2018 RO7, 2018 RM2, 2018 RL, 2018 RK7, 2018 PJ10, 2018 NR, 2018 KT, 2018 KG1, 2018 KF3, 2016 XD1, 276468
T08ATLAS Mauna Loa in Hawaii, 15 in MPEC 2018-U71 -- 68950, 53789, 518635, 438429, 418929, 37336, 31345, 18109, 17274, 162687, 13553, 12538, 6456, 1916, 719
160Castelmartini Obs. in Italy, 6 in MPEC 2018-U71 -- 88263, 523603, 455550, 12538, 3200, 2061
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 29 in MPEC 2018-U71 -- 2018 UR1, 2018 UF1, 2018 UE1, 2018 TY2, 2018 TV4, 2018 TV2, 2018 TT2, 2018 TS, 2018 TR5, 2018 TQ1, 2018 TP, 2018 TN1, 2018 TL2, 2018 TK2, 2018 TJ6, 2018 TG6, 2018 TE6, 2018 TE3, 2018 SZ2, 2018 SY2, 2018 SK3, 2018 RM2, 2018 RL2, 2018 RC8, 2018 NO4, 2018 MM8, 2018 LO6, 2018 LB1, 2016 UO41
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-U71 -- 2018 UA1
C95SATINO-1 in France, 1 in MPEC 2018-U71 -- 2001 QA143
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2018-U72 & 2018-U73 -- 2016 YZ, 2015 WN2
718Wiggins Obs. in Utah, 1 in MPEC 2018-U71 -- 2018 TQ2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 October '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2312 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 UM1NEODyS16302063-2118552.6e-05-4.20-4.44-NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2018-10-19.146 to 2018-10-24.103."
2018 TT6NEODyS16302063-209421.89e-10-11.04-11.060NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2018-10-05.295 to 2018-10-05.449."
2018 TS6NEODyS16302068-2117122.35e-06-7.49-7.820NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2018-10-03.498 to 2018-10-05.171."
2018 TJ6JPL Sentry16302106-2118138.867121e-07-5.65-5.910JPL: Computed at 07:52 today Pacific time based on 24 observations spanning 10.732 days (2018-Oct-15.51484 to 2018-Oct-26.24727). Diameter approximately 0.067 km. from weighted mean H=23.52.
2018 TG6JPL Sentry16302087-208721.0576e-07-8.47-8.700JPL: Computed at 07:50 today Pacific time based on 28 observations spanning 10.787 days (2018-Oct-15.45216 to 2018-Oct-26.23941). Diameter approximately 0.012 km. from weighted mean H=27.29.
2018 SV13NEODyS16302020-2118764.43e-06-5.15-5.64-NEODyS: "Based on 5 optical observations (of which 0 are rejected as outliers) from 2018-09-28.682 to 2018-09-29.771."
2014 HS197NEODyS16302061-209535.75e-07-8.32-8.320NEODyS: "Based on 18 optical observations (of which 2 are rejected as outliers) from 2014-04-23.085 to 2014-04-25.233."

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 October '18

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

0006 10/27Grabbed MPEC 2018-U72 - 2015 WN2 - see above
Grabbed MPEC 2018-U73 - 2016 YZ - see above
1910Generated Traffic Report
1630Noted that NEODyS has updated its 2014 HS197 risk assessment - see above
Noted that NEODyS has posted 2018 SV13 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 TG6 risk assessment - see above
Noted that JPL Sentry has updated its 2018 TJ6 risk assessment - see above
Noted that NEODyS has posted 2018 TS6 as an impact risk - see above
Noted that NEODyS has posted 2018 TT6 as an impact risk - see above
Noted that NEODyS has updated its 2018 UM1 risk assessment - see above
Grabbed MPEC 2018-U71 - Daily Orbit Update - see above