Contents on 30 May '18
- Traffic Report -- two objects
- IAU Minor Planet Center
- NEOCP Activity -- twelve listings
- New MPECs -- one MPEC
- Observers -- two observers
- Impact Risk Monitoring -- one object
- Chronology
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page
Of 936 risk-listed objects, 51 have had news in the last 31 days. Updated at 1555 UTC on 30 May.
- Ephemerides for risk-listed objects & close passers
- News archive (old) & news image catalog (discontinued)
- Object Links - mainly for radar targets & close passers (mostly discontinued)
- Observing Campaigns (old)
The latest A/CC news is available via framed access, 
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
- Observations of risk-listed objects
- K18K02Y 2018 KY2 (small asteroid, arc=5 days, H=27.2 ~12m, close passer) from Golden Hill Obs. (May 25.93-95p6)
- Observations of other objects
- 85989 85989 1999 JD6 from Wishing Star Obs. (May 30.07p3)
Observers on 30 May '18
Two observers appear in today's MPEC.
| Code | Observer / observatory |
|---|---|
| J77 | Golden Hill Obs. in England, 1 in MPEC 2018-K105 -- 2018 KY2 |
| I15 | Wishing 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
| 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 KY2 | JPL Sentry | 1555 | R E M O V E D | JPL: 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.
| 1740 | Generated Traffic Report |
| 1555 | Noted that JPL Sentry has removed 2018 KY2 as an impact risk - see above Grabbed MPEC 2018-K105 - Daily Orbit Update - see above |
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