Contents  on 30 May '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 30 May '18

Two objects reported inside ten LD

Two minor planets are known to be within ten lunar distances (LD) of Earth today. 2018 KN2 heads out from 6.13 to 6.58 LD and radar target 68347 2001 KB67 leaves our ten-LD traffic reporting zone, traveling from 9.87 to 11.05 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
6.10 LD yesterday 2018 KN2 27 m  6.13 to 6.58 LD May 25 - June 3
9.50 LD yesterday 68347 2001 KB67 371 m  9.87 to 11.05 LD May 28 - 30 radar target, exits ten LD
Approaching (sorted by 10-LD bubble entry date)
5.56 LD June 10 2018 EJ4 186 m  15.99 from 17.29 LD June 4 - 16 radar/NHATS target
8.96 LD June 11 2015 DP155 162 m  14.20 from 14.96 LD June 6 - 15 NHATS target

This report was generated at 1740 UTC. Today's DOU MPEC posts astrometry for just two objects, one set being additional observations of departed risk-listed intruder 2018 KY2.

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 30 May '18

The MPC's NEO Confirmation Page has 12 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had twelve objects listed. Of these, three were "one nighters." So far The Tracking News has counted a total of thirteen 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 30 May '18

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 30 May '18 >>  MPEC 2018-K105 - "12:02 UT" - Daily Orbit Update

Observers  on 30 May '18

Two observers appear in today's MPEC.

CodeObserver / observatory
J77Golden Hill Obs. in England, 1 in MPEC 2018-K105 -- 2018 KY2
I15Wishing Star Obs. in Rhode Island, 1 in MPEC 2018-K105 -- 85989
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 May '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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 KY2JPL Sentry1555R E M O V E DJPL: Risk listing removed at 1358 UTC today

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 30 May '18

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

1740Generated Traffic Report
1555Noted that JPL Sentry has removed 2018 KY2 as an impact risk - see above
Grabbed MPEC 2018-K105 - Daily Orbit Update - see above