2018-06-03 Tracking News

Contents on 3 June '18

Traffic Report -- one object
IAU Minor Planet Center
- NEOCP Activity -- 16 listings
- New MPECs -- two MPECs
Observers -- 21 observers
Impact Risk Monitoring -- one object
Chronology

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page
Of 934 risk-listed objects, 47 have had news in the last 31 days. Updated at 1603 UTC on 3 June.
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 3 June '18

One object reported inside ten LD

One minor object started the day just barely within ten LD, at 9.95 LD, and now we are without known visitors until 2018 EJ4 arrives inside ten LD tomorrow.

Neighborhood Traffic
Earth passage	I D	~Size	Distance today	Inside ten LD	Notes
6.10 LD May 29	2018 KN2	27 m	9.95 to 3.34 LD	May 30 - June 6	exits ten LD

Approaching (sorted by 10-LD bubble entry date)
5.56 LD June 10	2018 EJ4	186 m	10.97 from 12.19 LD	tomorrow - June 16	radar/NHATS target - DOU
8.96 LD June 11	2015 DP155	162 m	11.46 from 12.09 LD	June 6 - 15	NHATS target - DOU

This report was generated at 2142 UTC with follow-up in today's DOU MPEC for approaching objects 2018 EJ4 and 2015 DP155 and departed 2018 KT2. The NEOCP object ZLAF9B2 and possible impactor mentioned here yesterday has now been designated 2018 LA (MPEC) and, yes, it did hit, exploding high over southern Botswana but reported mostly from witnesses and cameras in northern South Africa. From infrasound data, Peter Brown puts the object's width at about two meters. This is the third small asteroid since 2008 caught by telescope before Earth impact -- all of them discovered with the same Arizona Catalina Sky Survey (CSS) telescope by professional CSS-team astronomer Richard Kowalski who, as an amateur twenty years ago started the Minor Planet Mailing List (MPML). And the MPML has been lively today with discussion, new information, and work at refining the available data about the big event. See, for instance this thread. Watch A/CC's links page for more info as we get it.
The many programming scripts used to create these pages expect a minor object, if it enters our ten-LD traffic reporting sphere, to leave. And, if it doesn't leave, some major exceptions have to be handled. We haven't had the opportunity to work on these problems for more than four years, and we don't yet have things working smoothly. That's why the delay in posting today's report, and there may be more delays.
Update at 2318 UTC: NASA/JPL has posted a news item about this event.

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 3 June '18

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of eighteen 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 3 June '18

Minor Planet Electronic Circulars

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

MPEC 2018-L03 time-stamped "12:02 UT" - Daily Orbit Update - see below
MPEC 2018-L04 time-stamped "16:15 UT" - 2018 LA

MPEC 2018-L04 - "16:15 UT" - 2018 LA

K18L00A 2018 LA (Earth MOID=0.0 LD, H=30.6 ~3m) was picked up at 0814 UT on 2 June by the Mt. Lemmon Survey (MLS), observing it at June 2.34-36p4 and 2.40p4. This detection was confirmed by Steward Obs. Mt. Lemmon Station (June 2.40p4) and ATLAS Mauna Loa (June 2.49-50p2).

MPC comment: "This object no longer exists (in its original form), following its entry into the Earth's atmosphere on 2018 June 2... [The orbit shown,] based on only the given astrometric observations, indicates that the object reached 50-km height above the Earth's surface around 16:51 UTC over southern Africa."

<< DOU on 3 June '18 >> MPEC 2018-L03 - "12:02 UT" - Daily Orbit Update

Observations of recently (no longer) risk-listed objects
K18K01B 2018 KB1 (arc=17 days, H=20.6 ~257m) from Steward Mt. Lemmon Sta. (June 3.43p4)
K18J05D 2018 JD5 (arc=19 days, H=19.0 ~537m) from Steward Mt. Lemmon Sta. (June 3.46p5) and the Spacewatch 1.8m telescope (June 3.46-47p3)
K10W09C 2010 WC9 (small asteroid, arc=3 opp, H=23.6 ~65m, close passer) from N.V. Maigurova via Nikolaev Obs. (May 14.95-97p8)
Observations of close-passing objects
K18K02T 2018 KT2 (arc=10 days, H=26.9 ~14m, NHATS target) from the Spacewatch 0.9m telescope (June 3.23p2)
K18E04J 2018 EJ4 (arc=82 days, H=21.3 ~186m, NHATS target, radar support) from Maigurova/Nikolaev Obs. (May 28.85-87p10), Farra d'Isonzo Obs. (June 1.95-96p4), ATLAS Haleakala (June 2.45-49p4), San Marcello Pistoiese Obs. (June 2.89-91p3), Great Shefford Obs. (June 2.95-97p4), and Squirrel Valley Obs. (June 3.07-09p4)
K15DF5P 2015 DP155 (arc=2 opp, H=21.4 ~178m, NHATS target) from Landehen Obs. (June 1.91-92p5), Farra d'Isonzo Obs. (June 1.98p3), and the Catalina Sky Survey (CSS) (June 2.35-37p3)
Observation campaigns (NHATS targets, radar support)
K18K01P 2018 KP1 (arc=15 days, H=25.1 ~32m, NHATS) from Spacewatch 1.8m (June 3.25-27p3)
K18K00R 2018 KR (arc=17 days, H=26.4 ~18m, NHATS) from Spacewatch 1.8m (June 3.24p3)
K18J01O 2018 JO1 (arc=26 days, H=25.0 ~34m, NHATS) from Spacewatch 1.8m (June 3.38-40p3 at R=22.2-3)
K18G01L 2018 GL1 (arc=55 days, H=23.6 ~65m, NHATS) from Steward Mt. Lemmon Sta. (June 3.44p4)
K17K34U 2017 KU34 (arc=2 opp, H=23.6 ~65m, NHATS) from Spacewatch 0.9m (June 3.18-20p3)
05604 5604 1992 FE (radar) from MLS (June 2.16-18p4)
-- NHATS target table -- Planetary radar schedules: Arecibo & Goldstone
Observations of small asteroids (H>22.0)
K18K03C 2018 KC3 (arc=10 days, H=23.1 ~81m) from Astronomical Research Obs. Westfield (June 2.20p3), Guidestar Obs. (June 2.90-92p3), and Spacewatch 0.9m (June 3.43-45p3)
K18K02S 2018 KS2 (Q=4.255 AU, arc=11 days, H=22.5 ~107m) from ARO Westfield (June 2.16-17p3)
K18K01X 2018 KX1 (i=37.5°, arc=12 days, H=23.0 ~85m) from ARO Westfield (June 2.11-14p3 at V=22.1-2)
K18K01Q 2018 KQ1 (arc=15 days, H=23.5 ~68m) from ARO Westfield (June 2.26p2), Steward Mt. Lemmon Sta. (June 3.41-43p4), and Spacewatch 0.9m (June 3.42-44p2)
K18K00P 2018 KP (arc=17 days, H=22.3 ~117m) from Spacewatch 1.8m (June 3.34-37p3)
K18J02V 2018 JV2 (arc=21 days, H=23.6 ~65m) from Spacewatch 0.9m (June 2.30-33p3)
K18J02S 2018 JS2 (arc=22 days, H=22.4 ~112m) from Spacewatch 0.9m (June 3.26-28p2)
K18J02J 2018 JJ2 (Q=4.351 AU, arc=24 days, H=24.0 ~54m) from ARO Westfield (June 2.24-25p3) and Chabot Obs. (June 3.34-35p3)
K18J02H 2018 JH2 (arc=23 days, H=23.2 ~78m) from ARO Westfield (June 2.16-19p3 at V=22.1-3)
K18J02G 2018 JG2 (arc=23 days, H=23.9 ~56m) from ARO Westfield (June 2.28-30p3)
K18J02F 2018 JF2 (arc=24 days, H=24.1 ~51m) from ARO Westfield (June 2.10-13p3 at V=22.0-22.1)
K18J01Y 2018 JY1 (arc=25 days, H=23.5 ~68m) from ARO Westfield (June 2.21-22p3), Guidestar Obs. (June 2.94-97p3), Chabot Obs. (June 3.32-33p3), and Spacewatch 0.9m (June 3.39-41p2)
K18J01W 2018 JW1 (arc=27 days, H=22.4 ~112m) from Spacewatch 1.8m (June 3.27-28p2)
Observations of other objects
K18K03F 2018 KF3 (arc=8 days, H=19.8 ~371m) from Steward Mt. Lemmon Sta. (June 3.44p4)
K18K03D 2018 KD3 (arc=9 days, H=20.9 ~224m) from Steward Mt. Lemmon Sta. (June 3.32p4)
K18K02M 2018 KM2 (arc=13 days, H=20.4 ~282m) from MLS (June 2.37-38p3) and Spacewatch 0.9m (June 3.36-38p3)
K18K02L 2018 KL2 (arc=13 days, H=21.7 ~155m) from Steward Mt. Lemmon Sta. (June 3.40-41p4)
K18K01M 2018 KM1 (q=0.354 AU, arc=15 days, H=20.8 ~234m) from ARO Westfield (June 2.18-20p5) and Steward Mt. Lemmon Sta. (June 3.37-39p4)
K18K01G 2018 KG1 (Q=4.279 AU, arc=16 days, H=19.1 ~513m) from Spacewatch 0.9m (June 3.25-28p3)
K18K00V 2018 KV (Q=4.391 AU, arc=50 days, H=17.1 ~1.29 km) from ARO Westfield (June 2.21-22p3)
K18J05E 2018 JE5 (arc=19 days, H=20.6 ~257m) from ARO Westfield (June 2.23-24p3), Guidestar Obs. (June 2.98-00p3), Chabot Obs. (June 3.30-31p3), Spacewatch 0.9m (June 3.38-41p3), and Steward Mt. Lemmon Sta. (June 3.41-43p4)
K18J03K 2018 JK3 (i=43.2°, arc=13 days, H=21.7 ~155m) from UH/Tholen NEO Follow-Up 2.24m Telescope (May 24.44p2)
K18J03C 2018 JC3 (arc=50 days, H=20.1 ~323m) from ARO Westfield (June 2.24-25p3)
K18J03A 2018 JA3 (arc=20 days, H=21.4 ~178m) from MLS (June 2.16-17p4)
K18J02D 2018 JD2 (i=51.0°, q=0.214 AU, arc=25 days, H=18.8 ~589m) from Sandlot Obs. (June 3.14-15p3)
K18J01S 2018 JS1 (Q=4.377 AU, arc=50 days, H=20.3 ~295m) from ARO Westfield (June 2.21-22p3)
K18J01Q 2018 JQ1 (arc=26 days, H=21.4 ~178m) from ARO Westfield (June 2.23-25p2), Chabot Obs. (June 3.28-29p3), and Spacewatch 0.9m (June 3.35-36p2)
K18J01E 2018 JE1 (arc=26 days, H=19.9 ~355m) from Pan-STARRS 1 (PS1) (June 2.30-32p3)
K18H03S 2018 HS3 (arc=38 days, H=20.6 ~257m) from Spacewatch 0.9m (June 3.25-29p3) and Steward Mt. Lemmon Sta. (June 3.36-37p4)
K18H02V 2018 HV2 (i=43.4°, arc=22 days, H=20.6 ~257m) from Maigurova/Nikolaev Obs. (May 14.91-93p9)
K18G05A 2018 GA5 (Q=4.921 AU, arc=51 days, H=18.2 ~776m) from ARO Westfield (June 2.29-30p3) and Guidestar Obs. (June 3.02-04p3)
K18G04X 2018 GX4 (arc=52 days, H=19.2 ~490m) from Spacewatch 0.9m (June 3.26-29p3)
K18G00L 2018 GL (arc=59 days, H=20.4 ~282m) from Spacewatch 1.8m (June 3.30-31p2 at R=22.3)
K18E04Q 2018 EQ4 (arc=82 days, H=19.6 ~407m) from Spacewatch 0.9m (June 2.34-36p3 & 3.31-34p3) and Steward Mt. Lemmon Sta. (June 3.41p3)
K17X62H 2017 XH62 (arc=2 opp, H=20.1 ~323m) from Spacewatch 0.9m (June 2.27-29p3 & 3.30-34p3)
K17W14H 2017 WH14 (arc=2 opp, H=18.1 ~812m) from ARO Westfield (June 2.22-23p3)
K16CQ4X 2016 CX264 (arc=2 opp, H=19.5 ~426m) from MLS (June 2.18-19p4)
K15J01Y 2015 JY1 (arc=2 opp, H=20.8 ~234m) from Spacewatch 1.8m (June 3.19-22p3 at R=21.7-22.2)
K11L02Y 2011 LY2 (arc=2 opp, H=21.2 ~195m) from PS1 (June 2.28-32p3)
K03K16W 2003 KW16 (i=38.4°, arc=4 opp, H=20.1 ~323m) from Spacewatch 0.9m (June 3.16-17p3)
p4652 514652 2005 SC71 from the Palomar Transient Factory (PTF) (June 2.17-19p2)
o8796 508796 2000 KN44 from MLS (June 2.36-37p3)
o4711 504711 2009 SP171 from ARO Westfield (June 2.29-31p3)
l5967 475967 2007 JF22 from ATLAS Mauna Loa (June 2.36-39p4)
k7309 467309 1996 AW1 from Farra d'Isonzo Obs. (June 2.01-02p4)
e5212 405212 2003 QC10 from ATLAS Mauna Loa (June 2.29-31p4)
b4851 374851 2006 VV2 from ATLAS Mauna Loa (June 2.28-31p4)
X7228 337228 2000 FL1 from CSS (June 2.24-27p3)
P9802 259802 2004 BJ86 from CSS (June 2.29-31p3)
O2643 242643 2005 NZ6 from ATLAS Mauna Loa (June 2.38-41p4)
M0839 220839 2004 VA from PS1 (June 2.28-32p4)
L4088 214088 2004 JN13 from PS1 (June 2.29-32p3)
L2359 212359 2006 EV52 from Maigurova/Nikolaev Obs. (May 15.05-06p3)
I6822 186822 2004 FE31 from PS1 (June 2.28-30p3)
G4201 164201 2004 EC from ATLAS Haleakala (June 2.31-32p4)
G4121 164121 2003 YT1 from ATLAS Mauna Loa (June 2.27-29p4)
G3243 163243 2002 FB3 from ATLAS Haleakala (June 2.27-30p4)
G2854 162854 2001 DE47 from Spacewatch 0.9m (June 2.38-40p3)
G2635 162635 2000 SS164 from Spacewatch 0.9m (June 2.27-29p3)
F2931 152931 2000 EA107 from ATLAS Haleakala (June 2.32-34p4)
E1531 141531 2002 GB from MLS (June 2.16-17p3)
D9345 139345 2001 KA67 from Guidestar Obs. (June 3.05-07p7)
D8847 138847 2000 VE62 from CSS (June 2.31-32p4) and Guidestar Obs. (June 2.87-89p3)
D6839 136839 1997 WT22 from MLS (June 2.32-34p4)
88263 88263 2001 KQ1 from MLS (June 2.43-46p4)
85989 85989 1999 JD6 from CSS (June 2.24-27p4)
66391 66391 1999 KW4 from Maigurova/Nikolaev Obs. (May 28.96-98p10, 29.95-99p9 & 30.93-95p10), Grorudalen Obs. (May 31.94-95p3), and ATLAS Haleakala (June 2.48-52p4)
53110 53110 1999 AR7 from CSS (June 2.16-17p4)
36183 36183 1999 TX16 from ATLAS Mauna Loa (June 2.43-46p4)
15745 15745 Yuliya (1991 PM5) from ATLAS Haleakala (June 2.51-54p3) and Squirrel Valley Obs. (June 3.13-19p4)
09856 9856 1991 EE from CSS (June 2.18-19p3)
06455 6455 1992 HE from CSS (June 2.16-17p4)
05646 5646 1990 TR from ATLAS Mauna Loa (June 2.41-44p4)
01866 1866 Sisyphus (1972 XA) from CSS (June 2.22-24p4)
01685 1685 Toro (1948 OA) from MLS (June 2.18-20p4) and ATLAS Mauna Loa (June 2.39-41p4)
01627 1627 Ivar (1929 SH) from ATLAS Haleakala (June 2.42-46p4)
01036 1036 Ganymed (1924 TD) from ATLAS Mauna Loa (June 2.28-31p7)

Observers on 3 June '18

A total of 21 observers appear in today's MPECs.

Code	Observer / observatory
`H21`	Astronomical Research Obs. Westfield in Illinois, 18 in MPEC 2018-L03 -- 2018 KX1, 2018 KV, 2018 KS2, 2018 KQ1, 2018 KM1, 2018 KC3, 2018 JY1, 2018 JS1, 2018 JQ1, 2018 JJ2, 2018 JH2, 2018 JG2, 2018 JF2, 2018 JE5, 2018 JC3, 2018 GA5, 2017 WH14, 504711
`T05`	ATLAS Haleakala in Hawaii, 7 in MPEC 2018-L03 -- 2018 EJ4, 66391, 164201, 163243, 15745, 152931, 1627
`T08`	ATLAS Mauna Loa in Hawaii, 10 in MPECs 2018-L03 & 2018-L04 -- 2018 LA, 475967, 405212, 374851, 36183, 242643, 164121, 5646, 1685, 1036
`703`	Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2018-L03 -- 2015 DP155, 85989, 53110, 337228, 259802, 138847, 9856, 6455, 1866
`G58`	Chabot Obs. in northern California, 4 in MPEC 2018-L03 -- 2018 JY1, 2018 JQ1, 2018 JJ2, 2018 JE5
`595`	Farra d'Isonzo Obs. in Italy, 3 in MPEC 2018-L03 -- 2018 EJ4, 2015 DP155, 467309
`J95`	Great Shefford Obs. in England, 1 in MPEC 2018-L03 -- 2018 EJ4
`238`	Grorudalen Obs. in Norway, 1 in MPEC 2018-L03 -- 66391
`A17`	Guidestar Obs. in Germany, 6 in MPEC 2018-L03 -- 2018 KC3, 2018 JY1, 2018 JE5, 2018 GA5, 139345, 138847
`Z43`	Landehen Obs., 1 in MPEC 2018-L03 -- 2015 DP155
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2018-L03 & 2018-L04 -- 2018 LA, 2018 KM2, 2018 JA3, 2016 CX264, 88263, 508796, 141531, 136839, 5604, 1685
`0895`	N.V. Maigurova via Nikolaev Obs. in Ukraine, 5 in MPEC 2018-L03 -- 2018 HV2, 2018 EJ4, 2010 WC9, 66391, 212359
`I41`	Palomar Transient Factory in southern California, 1 in MPEC 2018-L03 -- 514652
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 5 in MPEC 2018-L03 -- 2018 JE1, 2011 LY2, 220839, 214088, 186822
`104`	San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-L03 -- 2018 EJ4
`H36`	Sandlot Obs. in Kansas, 1 in MPEC 2018-L03 -- 2018 JD2
`691`	Spacewatch 0.9m telescope in Arizona, 18 in MPEC 2018-L03 -- 2018 KT2, 2018 KQ1, 2018 KM2, 2018 KG1, 2018 KC3, 2018 JY1, 2018 JV2, 2018 JS2, 2018 JQ1, 2018 JE5, 2018 HS3, 2018 GX4, 2018 EQ4, 2017 XH62, 2017 KU34, 2003 KW16, 162854, 162635
`291`	Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2018-L03 -- 2018 KR, 2018 KP1, 2018 KP, 2018 JW1, 2018 JO1, 2018 JD5, 2018 GL, 2015 JY1
`W34`	Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-L03 -- 2018 EJ4, 15745
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 12 in MPECs 2018-L03 & 2018-L04 -- 2018 LA, 2018 KQ1, 2018 KM1, 2018 KL2, 2018 KF3, 2018 KD3, 2018 KB1, 2018 JE5, 2018 JD5, 2018 HS3, 2018 GL1, 2018 EQ4
`T12`	UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-L03 -- 2018 JK3

For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring on 3 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.
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

2017 TA6	NEODyS	1601	R E M O V E D						-

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 3 June '18

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

2142	Generated Traffic Report
1711	Grabbed MPEC 2018-L04 - 2018 LA - see above
1601	Noted that NEODyS has removed 2017 TA6 as an impact risk - see above Grabbed MPEC 2018-L03 - Daily Orbit Update - see above

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