Contents  on 28 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 28 May '18

Five objects reported inside ten LD

Today there are five asteroids reported within ten lunar distances (LD) of Earth. Nearest are risk-listed intruder 2018 KY2, outbound from 4.89 to 7.59 LD, and 2018 KN2, which is inbound from 6.77 to 6.20 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
0.39 LD May 23 2018 KW1 4 m  7.08 to 8.64 LD May 17 - 29 intruder, NHATS target
0.78 LD May 26 2018 KY2 13 m  4.89 to 7.59 LD May 22 - 29 intruder, risk
2.48 LD May 23 2018 KT2 14 m  9.89 to 11.77 LD May 18 - 28 NHATS target, exits ten LD
6.10 LD tomorrow 2018 KN2 27 m  6.20 from 6.77 LD May 25 - June 3 DOU
9.50 LD tomorrow 68347 2001 KB67 371 m  9.51 from 10.07 LD today - May 30 radar target, enters ten LD
Approaching (sorted by 10-LD bubble entry date)
5.56 LD June 10 2018 EJ4 186 m  18.60 from 19.91 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  15.73 from 16.52 LD June 6 - 15 NHATS target - DOU

This report was generated at 1642 UTC with follow-up in today's DOU MPEC for three objects in the active traffic table here.

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 28 May '18

The MPC's NEO Confirmation Page has 19 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nineteen objects listed. Of these, five were "one nighters."

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 28 May '18

Minor Planet Electronic Circulars

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

<< DOU on 28 May '18 >>  MPEC 2018-K100 - "12:08 UT" - Daily Orbit Update

MPEC 2018-K99 - "11:17 UT" - 2016 YV8

MPEC 2018-K98 - "11:15 UT" - 2015 TK178

Observers  on 28 May '18

Ten observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2018-K100 -- 1036
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2018-K100 -- 66391, 450648, 15745, 1627
160Castelmartini Obs. in Italy, 1 in MPEC 2018-K100 -- 2018 JA
G58Chabot Obs. in northern California, 2 in MPEC 2018-K100 -- 2018 JJ3, 2018 JJ2
J95Great Shefford Obs. in England, 1 in MPEC 2018-K100 -- 2018 JK3
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 7 in MPEC 2018-K100 -- 2018 JW1, 2018 EJ4, 2015 MB54, 2015 DP155, 2014 UV, 2014 NE3, 2009 QJ9
J69North Obs. in England, 1 in MPEC 2018-K100 -- 139289
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-K100 -- 2018 JK3
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPEC 2018-K100 -- 2018 KQ1, 2018 KN2
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPECs 2018-K98, 2018-K99 & 2018-K100 -- 2016 YV8, 2015 TK178, 495829
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 May '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 KY2NEODyS04082075-211529.54e-08-7.98-8.230NEODyS: "Based on 18 optical observations (of which 2 are rejected as outliers) from 2018-05-21.291 to 2018-05-25.896."
2018 JNNEODyS04082100-211233.0e-06-5.92-5.930NEODyS: "Based on 146 optical observations (of which 1 are rejected as outliers) from 2018-05-05.424 to 2018-05-27.457."

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 28 May '18

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

1642Generated Traffic Report
1531Grabbed MPEC 2018-K98 - 2015 TK178 - see above
Grabbed MPEC 2018-K99 - 2016 YV8 - see above
Grabbed MPEC 2018-K100 - Daily Orbit Update - see above
0408Noted that NEODyS has updated its 2018 JN risk assessment - see above
Noted that NEODyS has posted 2018 KY2 as an impact risk - see above