Contents  on 16 June '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 16 June '18

Five objects reported inside ten LD

There are five small Solar-System bodies reported within ten lunar distances (LD) of Earth today. Nearest is risk-listed intruder 2018 LV3, which exits Earth's sphere of gravitatinal influece, sliding away from 2.39 to 4.78 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
0.86 LD yesterday 2018 LV3 17 m  2.39 to 4.78 LD June 11 - 19 intruder, exits Earth SOI, risk
1.56 LD June 14 2018 LD1 18 m  3.63 to 5.94 LD June 10 - 18 risk
3.64 LD June 11 2018 LW3 21 m  9.93 to 11.93 LD June 7 - 16 exits ten LD
5.56 LD June 10 2018 EJ4 186 m  9.10 to 10.23 LD June 4 - 16 radar/NHATS target, exits ten LD
7.62 LD yesterday 2018 LK 155 m  7.63 to 8.27 LD June 13 - 18
6.0   LD June 29* 2018 LR3 18 m  12.2 from 12.9 LD June 20 - July 8 Earth passage uncertainty +/- 6 mins.*, NHATS target, risk

This report was generated at 2047 UTC with the recovery of distant 478784 2012 UV136 represented by a single astrometric position in today's DOU MPEC. (Turns out that having an observation "arc" with only one point crashes the software that generates our home page, which will not be updating today.) The DOU also has follow-up for four departed objects: 2015 DP155, 68347 2001 KB67, 1999 FN19, and risk-listed 2018 LE1.

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 16 June '18

The MPC's NEO Confirmation Page has 101 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 101 objects listed. Of these, 41 were "one nighters." So far The Tracking News has counted a total of 107 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 16 June '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 16 June '18 >>  MPEC 2018-M01 - "12:04 UT" - Daily Orbit Update

Observers  on 16 June '18

Fourteen observers appear in today's MPEC.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 5 in MPEC 2018-M01 -- 138847, 9856, 3752, 1866, 1580
T08ATLAS Mauna Loa in Hawaii, 14 in MPEC 2018-M01 -- 2018 LN4, 2015 FP118, 68348, 495615, 475967, 408752, 302591, 25916, 220839, 139345, 7889, 5604, 887, 719
073Bucharest Obs. in Romania, 1 in MPEC 2018-M01 -- 2015 DP155
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2018-M01 -- 3552
160Castelmartini Obs. in Italy, 6 in MPEC 2018-M01 -- 85989, 68347, 66391, 467309, 15745, 1627
Q628N. Falla in England via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-M01 -- 86324
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2018-M01 -- 2013 QH10
628Mulheim-Ruhr Obs. in Germany, 1 in MPEC 2018-M01 -- 68347
Z80Northolt Branch Obs. in England, 2 in MPEC 2018-M01 -- 2015 DP155, 66391
I41Palomar Transient Factory (PTF) in southern California, 6 in MPEC 2018-M01 -- 68350, 53110, 514652, 504711, 259802, 138847
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPEC 2018-M01 -- 2018 JS1, 2016 YV8, 2014 HM187, 2005 UY5, 2002 OS4, 2001 SC170, 99799, 364877, 331471, 302591, 18882, 163760, 7350
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-M01 -- 508767
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPEC 2018-M01 -- 2018 LE1, 1999 FN19, 478784, 253062
C51WISE in Earth polar orbit, 4 in MPEC 2018-M01 -- 2018 LN2, 2012 FN62, 2001 SC170, 508786
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 June '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.





Notes for Today's Latest Risk Assessments
2018 LE1NEODyS18042066-211292.33e-06-7.34-7.350NEODyS #2 for the day: "Based on 50 optical observations (of which 1 are rejected as outliers) from 2018-06-05.395 to 2018-06-14.468."
JPL Sentry15042102-210211.702e-06-7.46-7.460JPL: Computed at 07:37 today Pacific time based on 49 observations spanning 9.0727 days (2018-Jun-05.39422 to 2018-Jun-14.466903). Diameter approximately 0.010 km. from weighted mean H=27.69.
2018 LMNEODyS15042112-211625.52e-07-6.84-6.920NEODyS: "Based on 83 optical observations (of which 0 are rejected as outliers) from 2018-06-04.255 to 2018-06-15.038."

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 16 June '18

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

2047Generated Traffic Report
1804Noted that NEODyS has updated its 2018 LE1 risk assessment - see above
1504Noted that JPL Sentry has updated its 2018 LE1 risk assessment - see above
Noted that NEODyS has updated its 2018 LE1 risk assessment - see above
Noted that NEODyS has reposted 2018 LM as an impact risk - see above
Grabbed MPEC 2018-M01 - Daily Orbit Update - see above