Contents on 28 May '18
- Traffic Report -- five objects
- IAU Minor Planet Center
- NEOCP Activity -- 19 listings
- New MPECs -- three MPECs
- Observers -- ten observers
- Impact Risk Monitoring -- two objects
- 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 1533 UTC on 28 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 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.
- MPEC 2018-K98 time-stamped "11:15 UT" - 2015 TK178 - see below
- MPEC 2018-K99 time-stamped "11:17 UT" - 2016 YV8 - see below
- MPEC 2018-K100 time-stamped "12:08 UT" - Daily Orbit Update
<< DOU on 28 May '18 >> MPEC 2018-K100 - "12:08 UT" - Daily Orbit Update
- Observations of close-passing objects
- K18K02N 2018 KN2 (arc=5 days, H=25.5 ~27m) from Steward Obs. Mt. Lemmon Station (May 27.36-38p14)
- K18E04J 2018 EJ4 (arc=76 days, H=21.3 ~186m, NHATS target, radar support) from Spacewatch via Kitt Peak Natl. Obs. (KPNO) (May 28.31p3)
- K15DF5P 2015 DP155 (arc=2 opp, H=21.4 ~178m, NHATS target) from Spacewatch/KPNO (May 28.31-32p3)
- Observation campaigns (NHATS targets, radar support)
- K15M54B 2015 MB54 (arc=2 opp, H=23.9 ~56m, NHATS) from Spacewatch/KPNO (May 28.32-33p3)
-- NHATS target table -- Planetary radar schedules: Arecibo & Goldstone - Observations of small asteroids (H>22.0)
- K18K01Q 2018 KQ1 (arc=8 days, H=23.5 ~68m) from Steward Mt. Lemmon Sta. (May 27.40-41p3)
- K18J03J 2018 JJ3 (arc=13 days, H=24.0 ~54m) from Chabot Obs. (May 28.27-30p3)
- K18J02J 2018 JJ2 (Q=4.350 AU, arc=18 days, H=24.0 ~54m) from Chabot Obs. (May 28.33-34p3)
- K18J01W 2018 JW1 (arc=21 days, H=22.4 ~112m) from Spacewatch/KPNO (May 28.27-30p3 at R=21.4-22.6)
- Observations of other objects
- K18J03K 2018 JK3 (i=43.2°, arc=13 days, H=21.7 ~155m) from Northolt Branch Obs. (May 27.95p2) and Great Shefford Obs. (May 27.96p3)
- K18J00A 2018 JA (arc=24 days, H=20.4 ~282m) from Castelmartini Obs. (May 26.85p5)
- K14U00V 2014 UV (i=36.0°, arc=2 opp, H=20.5 ~269m) from Spacewatch/KPNO (May 28.39-42p3)
- K14N03E 2014 NE3 (arc=2 opp, H=20.1 ~323m) from Spacewatch/KPNO (May 28.43-45p3)
- K09Q09J 2009 QJ9 (Q=4.405 AU, arc=2 opp, H=19.4 ~446m) from Spacewatch/KPNO (May 28.34-36p3)
- n5829 495829 1995 LG from UH/Tholen NEO Follow-Up 2.24m Telescope (May 24.58p4)
- j0648 450648 2006 UC63 from ATLAS Mauna Loa (May 27.46-49p5)
- D9289 139289 2001 KR1 from North Obs. (May 27.94p1)
- 66391 66391 1999 KW4 from ATLAS Mauna Loa (May 27.58-62p4)
- 15745 15745 Yuliya (1991 PM5) from ATLAS Mauna Loa (May 27.51-54p4)
- 01627 1627 Ivar (1929 SH) from ATLAS Mauna Loa (May 27.45-48p4)
- 01036 1036 Ganymed (1924 TD) from ATLAS Haleakala (May 27.32-34p4)
MPEC 2018-K99 - "11:17 UT" - 2016 YV8
- K16Y08V 2016 YV8 (H=19.6 ~407m) from Tholen 2.24m (May 10.56-58p3 at G=23.64-24.09, 15.58p1 at G=24.07 & 24.52-53p2 at G=23.18-47)
MPEC 2018-K98 - "11:15 UT" - 2015 TK178
- K15TH8K 2015 TK178 (H=19.3 ~467m) from Tholen 2.24m (May 10.27-28p2 at G=23.81-88 & 15.36p1 at G=24.15)
Observers on 28 May '18
Ten observers appear in today's MPECs.
| Code | Observer / observatory |
|---|---|
| T05 | ATLAS Haleakala in Hawaii, 1 in MPEC 2018-K100 -- 1036 |
| T08 | ATLAS Mauna Loa in Hawaii, 4 in MPEC 2018-K100 -- 66391, 450648, 15745, 1627 |
| 160 | Castelmartini Obs. in Italy, 1 in MPEC 2018-K100 -- 2018 JA |
| G58 | Chabot Obs. in northern California, 2 in MPEC 2018-K100 -- 2018 JJ3, 2018 JJ2 |
| J95 | Great 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 |
| J69 | North Obs. in England, 1 in MPEC 2018-K100 -- 139289 |
| Z80 | Northolt Branch Obs. in England, 1 in MPEC 2018-K100 -- 2018 JK3 |
| I52 | Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPEC 2018-K100 -- 2018 KQ1, 2018 KN2 |
| T12 | UH/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
| 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 | NEODyS | 0408 | 2075-2115 | 2 | 9.54e-08 | -7.98 | -8.23 | 0 | NEODyS: "Based on 18 optical observations (of which 2 are rejected as outliers) from 2018-05-21.291 to 2018-05-25.896." |
| 2018 JN | NEODyS | 0408 | 2100-2112 | 3 | 3.0e-06 | -5.92 | -5.93 | 0 | NEODyS: "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.
| 1642 | Generated Traffic Report |
| 1531 | Grabbed MPEC 2018-K98 - 2015 TK178 - see above Grabbed MPEC 2018-K99 - 2016 YV8 - see above Grabbed MPEC 2018-K100 - Daily Orbit Update - see above |
| 0408 | Noted that NEODyS has updated its 2018 JN risk assessment - see above Noted that NEODyS has posted 2018 KY2 as an impact risk - see above |
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