Contents  on 8 October '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 8 October '18

Thirteen objects reported inside ten LD

Thirteen transient natural objects are reported inside ten lunar distances (LD) of Earth today. Nearest is risk-listed intruder 2018 TV, which leaves the Earth-Moon system, flying out from 0.80 to 2.32 LD while passing the Moon at 1.05 LD. Two other objects, 2018 TE2 and newly announced 2018 TG2, are also within Earth's sphere of gravitational influence and both coincidentally come to 1.27 LD from our planet, their closest this time around.

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
0.23 LD Sept. 25 2018 SD2 6 m  8.59 to 9.26 LD Sept. 10 - Oct. 10 intruder, NHATS target, risk
0.74 LD yesterday 2018 TV 7 m  0.80 to 2.32 LD Oct. 2 - 13 intruder today, NHATS target, Moon closest 1.05 LD at 0513 UTC, risk - DOU
0.79 LD Sept. 30 2018 TC 15 m  9.21 to 10.50 LD Sept. 23 - today intruder, NHATS target, exits ten LD
1.27 LD today 2018 TG2 5 m  1.27 LD Oct. 2 - 14 NEW, NHATS target, Earth closest at 1033 UTC, Moon closest 1.40 LD at 2339 UTC - MPEC
1.27 LD today 2018 TE2 7 m  1.27 LD Oct. 5 - 11 Earth closest at 1035 UTC, Moon closest 1.18 LD at 1746 UTC
1.66 LD Oct. 5 2018 TZ 15 m  7.20 to 10.06 LD Oct. 2 - 8 exits ten LD
2.03 LD Oct. 5 2018 TU 11 m  5.83 to 8.35 LD Oct. 2 - 9
4.06 LD Sept. 24 2018 RQ1 51 m  9.75 to 10.38 LD Sept. 11 - today NHATS target, exits ten LD
4.30 LD Oct. 6 2018 TW1 10 m  5.21 to 6.41 LD Oct. 1 - 11
6.18 LD Oct. 4 2018 SC3 20 m  8.95 to 10.32 LD Sept. 30 - today exits ten LD - DOU
6.70 LD today 2018 SG3 13 m  6.70 LD Oct. 2 - 13 NHATS target, Earth closest at 0128 UTC
7.46 LD yesterday 2018 TF2 17 m  7.47 to 7.99 LD Oct. 5 - 10
8.12 LD today 2018 TY1 19 m  8.12 LD Oct. 5 - 10 Earth closest at 0101 UTC

This report was generated at 1842 UTC with the discovery of passing 2018 TG2 (MPEC) and with follow-up in today's DOU MPEC for two objects in the active traffic table above and three departed objects: 2018 SS1 and risk-listed 2018 TR and 2018 TB.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
6.6   LD Oct. 15* 2018 TS1 22 m  17.6 from 19.9 LD Oct. 12 - 18 EPU +/- 9 mins.*, NHATS target
3.1   LD Oct. 17* 2014 US7 18 m  17.2 from 19.1 LD Oct. 12 - 22 EPU +/- 3.10 hours*, NHATS target
9.02 LD Oct. 15 2018 SL3 32 m  21.94 from 24.76 LD Oct. 14 - 17
8.7   LD Oct. 18* 2016 GC221 37 m  32.4 from 35.5 LD Oct. 17 - 20 EPU +/- 6.07 hours*
7.51 LD Oct. 29 475534 2006 TS7 195 m  85.10 from 89.37 LD Oct. 27 - 31
* 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. 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 8 October '18

The MPC's NEO Confirmation Page has 78 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 78 objects listed. Of these, 29 were "one nighters." So far The Tracking News has counted a total of 81 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 8 October '18

Minor Planet Electronic Circulars

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


<< DOU on 8 Oct. '18 >>  MPEC 2018-T93 - "12:06 UT" - Daily Orbit Update


MPEC 2018-T92 - "04:16 UT" - 2018 TG2

Observers  on 8 October '18

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2018-T93 -- 2018 RY, 2018 RW3, 2018 RS1, 2018 RO7, 2018 RL2, 2018 RD7, 2018 NB, 2018 LZ5, 2018 KR2, 2014 US, 369264, 276468
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2018-T93 -- 518635, 105140, 719
160Castelmartini Obs. in Italy, 9 in MPEC 2018-T93 -- 2018 NB, 2011 UA, 2001 QA143, 523631, 523603, 443923, 250162, 155140, 115052
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2018-T93 -- 67399, 308043, 16834, 3691
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-T93 -- 2018 PM23
J95Great Shefford Obs. in England, 2 in MPECs 2018-T92 & 2018-T93 -- 2018 TV, 2018 TG2
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-T93 -- 2018 TO1
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-T92 -- 2018 TG2
711McDonald Obs. in Texas, 4 in MPEC 2018-T93 -- 2018 SR2, 2018 SP3, 2018 SB3, 2018 SA2
474Mt. John Obs. in New Zealand, 4 in MPEC 2018-T93 -- 2018 TA, 2018 SS1, 2018 SC3, 2018 LR15
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2018-T92 & 2018-T93 -- 2018 TG2, 2018 QP, 2018 KR2, 2005 PP, 20826, 197588
C95SATINO-1 in France, 1 in MPEC 2018-T93 -- 138847
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-T92 -- 2018 TG2
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-T93 -- 2018 RK7
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2018-T92 -- 2018 TG2
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2018-T93 -- 2018 TR, 2018 TB, 2018 SK3
L01Visnjan Obs., 1 in MPEC 2018-T92 -- 2018 TG2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 October '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 is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few 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 TVJPL Sentry1531R E M O V E DJPL: Risk listing removed at 1429 UTC today
2018 TRJPL Sentry15312093-2117164.3961571e-06-5.91-6.460JPL: Computed at 07:22 today Pacific time based on 35 observations spanning 4.0785 days (2018-Oct-02.30976 to 2018-Oct-06.3883). Diameter approximately 0.029 km. from weighted mean H=25.30.
2018 TBJPL Sentry16022095-210326.8194e-07-6.42-6.480JPL #2 for the day: Computed at 08:58 today Pacific time based on 131 observations spanning 4.1631 days (2018-Oct-02.42196 to 2018-Oct-06.58511). Diameter approximately 0.036 km. from weighted mean H=24.88.

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 8 October '18

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

1842Generated Traffic Report
1602Noted that JPL Sentry has updated its 2018 TB risk assessment - see above
1531Noted that JPL Sentry has updated its 2018 TB risk assessment - see above
Noted that JPL Sentry has updated its 2018 TR risk assessment - see above
Noted that JPL Sentry has removed 2018 TV as an impact risk - see above
1500Grabbed MPEC 2018-T92 - 2018 TG2 - see above
Grabbed MPEC 2018-T93 - Daily Orbit Update - see above