2018-06-07 Tracking News

Contents on 7 June '18

Traffic Report -- two objects
IAU Minor Planet Center
- NEOCP Activity -- 21 listings
- New MPECs -- eleven MPECs
Observers -- 38 observers
Impact Risk Monitoring -- four objects
Chronology

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page
Of 938 risk-listed objects, 51 have had news in the last 31 days. Updated at 1805 UTC on 7 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 7 June '18

Two objects reported inside ten LD

There are two minor planets reported inside ten lunar distances (LD) of Earth today. Nearest is 2018 EJ4, which moves in from 7.67 to 6.79 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
5.56 LD June 10	2018 EJ4	186 m	6.79 from 7.67 LD	June 4 - 16	radar/NHATS target - DOU
8.96 LD June 11	2015 DP155	162 m	9.52 from 9.90 LD	yesterday - June 15	NHATS target - DOU

Approaching (sorted by 10-LD bubble entry date)
1.6 LD June 14*	2018 LD1	18 m	16.5 from 19.0 LD	June 10 - 18	NEW, Earth passage uncertainty +/- 16 mins.*, risk - MPEC
7.62 LD June 15	2018 LK	147 m	23.23 from 25.90 LD	June 13 - 18	DOU

This report was generated at 1906 UTC with the discoveries of approaching 2018 LD1 (MPEC) and already departed 2018 LE1 (MPEC), which went by our planet at about 1.60 LD on May 28th. Both are risk-listed. Today's DOU MPEC has follow-up for approaching 2018 LK, inbound objects 2018 EJ4 and 2015 DP155, and departed 2018 LM.

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 7 June '18

The MPC's NEO Confirmation Page has 21 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 21 objects listed. Of these, six were "one nighters." So far The Tracking News has counted a total of 36 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 7 June '18

Minor Planet Electronic Circulars

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

MPEC 2018-L18 time-stamped "02:35 UT" - 2015 MO130 - see below
MPEC 2018-L19 time-stamped "02:37 UT" - 2017 MD7 - see below
MPEC 2018-L20 time-stamped "12:02 UT" - Daily Orbit Update - see below
MPEC 2018-L21 time-stamped "16:12 UT" - 2018 LB1 - see below
MPEC 2018-L22 time-stamped "16:15 UT" - 2018 LC1 - see below
MPEC 2018-L23 time-stamped "16:19 UT" - 2018 LD1 - see below
MPEC 2018-L24 time-stamped "16:23 UT" - 2018 LE1 - see below
MPEC 2018-L25 time-stamped "16:26 UT" - 2018 LF1 - see below
MPEC 2018-L26 time-stamped "16:30 UT" - 2018 LG1 - see below
MPEC 2018-L27 time-stamped "16:34 UT" - 2018 LH1 - see below
MPEC 2018-L28 time-stamped "16:37 UT" - 2018 LJ1

MPEC 2018-L28 - "16:37 UT" - 2018 LJ1

K18L01J 2018 LJ1 (small asteroid, H=26.5 ~17m) was picked up at 0947 UT on 6 June by Pan-STARRS 1 (PS1), observing it at June 5.34-38p4 and 6.41-44p7. This detection was confirmed by Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (June 7.11-12p3) and Mt. John Obs. (June 7.44-45p3).

MPEC 2018-L27 - "16:34 UT" - 2018 LH1

K18L01H 2018 LH1 (i=42.7°, Q=4.903 AU, H=19.7 ~389m) was picked up at 0743 UT on 6 June by PS1, observing it at May 21.46-48p2, June 4.33-37p4, and 6.32-39p7. This detection was confirmed by Holmes/CTIO (June 7.01-02p3), the Spacewatch 0.9m telescope (June 7.22-25p3), and Steward Obs. Mt. Lemmon Station (June 7.35p4).

MPEC 2018-L26 - "16:30 UT" - 2018 LG1

K18L01G 2018 LG1 (small asteroid, H=23.4 ~71m) was picked up at 0626 UT on 6 June by the Catalina Sky Survey (CSS), observing it at June 6.27-28p4. This detection was confirmed by Steward Mt. Lemmon Sta. (June 6.31-33p8 & 7.34p4), PS1 (June 6.32-35p3), Kiev Comet Station (June 6.85p5), Pascoli Obs. (June 6.87p3), Visnjan Obs. (June 6.88p4), Great Shefford Obs. (June 6.93p2), program code "(" (17) via Slooh.com Canary Islands Obs. (June 6.96p2), and Arcadia Obs. (June 7.52-54p2).

MPEC 2018-L25 - "16:26 UT" - 2018 LF1

K18L01F 2018 LF1 (small asteroid, H=24.6 ~41m) was picked up at 0942 UT on 5 June by PS1, observing it at June 5.40-43p3. This detection was confirmed by Spacewatch 0.9m (June 6.20p2 & 7.26-28p3), Sandlot Obs. (June 6.25-27p2), Steward Mt. Lemmon Sta. (June 6.26-27p4 & 7.36-37p4), the Spacewatch 1.8m telescope (June 6.28-29p3), Marco Micheli on Mauna Kea (June 6.36p2), Visnjan Obs. (June 6.98-99p3), and Holmes/CTIO (June 7.24-25p3).

MPEC 2018-L24 - "16:23 UT" - 2018 LE1

K18L01E 2018 LE1 (risk listed, Earth MOID=0.3 LD, H=27.4 ~11m, close passer) was picked up at 0927 UT on 5 June by PS1, observing it at June 5.39-43p4. This detection was confirmed by R. Wainscoat on Mauna Kea (June 6.36-37p2), Holmes/CTIO (June 7.26p3), Steward Mt. Lemmon Sta. (June 7.30p4), and Spacewatch 1.8m (June 7.31p3 & 7.36p3).

MPEC 2018-L23 - "16:19 UT" - 2018 LD1

K18L01D 2018 LD1 (risk listed, Earth MOID=1.2 LD, H=26.2 ~19m, close passer) was picked up at 0810 UT on 5 June by PS1, observing it at June 5.34-38p4. This detection was confirmed by Steward Mt. Lemmon Sta. (June 6.22p3 & 7.31-32p3), R. Wainscoat/Mauna Kea (June 6.35-36p3), Holmes/CTIO (June 7.19p2), and Spacewatch 0.9m (June 7.29-32p3).

MPEC 2018-L22 - "16:15 UT" - 2018 LC1

K18L01C 2018 LC1 (small asteroid, Earth MOID=6.2 LD, H=24.7 ~39m) was picked up at 0414 UT on 5 June by the Mt. Lemmon Survey (MLS), observing it at June 5.18-19p4 and 6.20-21p4. This detection was confirmed by Guidestar Obs. (June 5.90p3), Great Shefford Obs. (June 5.97-98p3), Visnjan Obs. (June 5.99p3), Sandlot Obs. (June 6.14-15p4), Steward Mt. Lemmon Sta. (June 6.36p4 & 7.16p4), and JAXA Space Tracking & Communications Center (JAXA STCC) (June 7.53p4).

MPEC 2018-L21 - "16:12 UT" - 2018 LB1

K18L01B 2018 LB1 (Q=4.577 AU, Earth MOID=0.4 LD, H=20.1 ~323m) was picked up at 0749 UT on 3 June by PS1, observing it at May 19.43-46p3 and June 3.33-36p4. This detection was confirmed by Spacewatch 1.8m (June 4.17-20p3 & 6.19-20p2), R. Wainscoat/Mauna Kea (June 6.35p3), and Holmes/CTIO (June 7.07-10p3).

<< DOU on 7 June '18 >> MPEC 2018-L20 - "12:02 UT" - Daily Orbit Update

Observations of risk-listed objects
K18L00M 2018 LM (small asteroid, arc=3 days, H=25.1 ~32m, close passer, NHATS target) from Astronomical Research Obs. Westfield (June 6.14-15p3), Wobblesock Obs. (June 6.45-46p3), Spacewatch 1.8m (June 7.16p3), and Steward Mt. Lemmon Sta. (June 7.17-18p4)
Observations of close-passing objects
K18L00K 2018 LK (arc=50 days, H=21.9 ~141m) from Holmes/CTIO (June 5.25-26p4)
K18E04J 2018 EJ4 (arc=85 days, H=21.3 ~186m, NHATS target, radar support) from Rand II Obs. (June 3.14-15p5), ROASTERR-1 (June 5.88-89p3), Great Shefford Obs. (June 6.04-05p3), and ATLAS Haleakala (June 6.44-47p4)
K15DF5P 2015 DP155 (arc=2 opp, H=21.4 ~178m, NHATS target) from ROASTERR-1 (June 5.91p4), Northolt Branch Obs. (June 5.98-99p10), and Oberfrauendorf Obs. (June 6.86-87p5)
Observation campaigns (NHATS targets, radar support)
K18L00C 2018 LC (arc=5 days, H=25.5 ~27m, NHATS) from Spacewatch 1.8m (June 7.16-17p3) and Steward Mt. Lemmon Sta. (June 7.30-31p4)
K18K02C 2018 KC2 (arc=18 days, H=22.8 ~93m, NHATS) from PS1 (June 6.37-39p3) and Spacewatch 0.9m (June 7.29-32p3)
05604 5604 1992 FE (radar) from CSS (June 6.18-19p3)
-- NHATS target table -- Planetary radar schedules: Arecibo & Goldstone
Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
K18L00G 2018 LG (arc=5 days, H=22.7 ~98m) from Steward Mt. Lemmon Sta. (June 7.20p4)
K18K03C 2018 KC3 (arc=14 days, H=23.0 ~85m) from Spacewatch 0.9m (June 7.34-35p3)
K18K01Q 2018 KQ1 (arc=16 days, H=23.5 ~68m) from ARO Westfield (June 4.33-35p3)
J99L01K 1999 LK1 (arc=4 opp, H=22.1 ~129m) from Pan-STARRS 2 (PS2) (June 6.29-32p3)
K18G02Q 2018 GQ2 (arc=57 days, H=21.8 ~148m) from Steward Mt. Lemmon Sta. (June 7.16-17p4)
Observations of other objects
K18L00N 2018 LN (arc=3 days, H=20.2 ~309m) from Wobblesock Obs. (June 6.42-44p3) and Steward Mt. Lemmon Sta. (June 7.20p4)
K18L00J 2018 LJ (q=0.352 AU, Q=4.385 AU, arc=4 days, H=21.2 ~195m) from Steward Mt. Lemmon Sta. (June 7.19p4)
K18K03F 2018 KF3 (arc=12 days, H=19.8 ~371m) from Steward Mt. Lemmon Sta. (June 7.41-42p4)
K18K03E 2018 KE3 (arc=11 days, H=19.2 ~490m) from Holmes/CTIO (June 5.16p3)
K18K02M 2018 KM2 (arc=17 days, H=20.4 ~282m) from Steward Mt. Lemmon Sta. (June 7.44p3)
K18K02L 2018 KL2 (arc=17 days, H=21.7 ~155m) from Spacewatch 0.9m (June 7.17-21p3) and Steward Mt. Lemmon Sta. (June 7.37p4)
K18K01U 2018 KU1 (arc=18 days, H=20.8 ~234m) from MLS (June 6.22-23p4 at G=21.2-22.1)
K18K01M 2018 KM1 (q=0.350 AU, arc=19 days, H=20.8 ~234m) from PS1 (June 6.32-35p3) and Steward Mt. Lemmon Sta. (June 7.36p4)
K18J02D 2018 JD2 (i=51.0°, q=0.214 AU, arc=29 days, H=18.9 ~562m) from Steward Mt. Lemmon Sta. (June 7.20-21p4)
K18J01Q 2018 JQ1 (arc=30 days, H=21.4 ~178m) from Steward Mt. Lemmon Sta. (June 7.45p4)
K18J01E 2018 JE1 (arc=30 days, H=19.9 ~355m) from CSS (June 6.25-26p4)
K18B02Y 2018 BY2 (arc=154 days, H=20.5 ~269m) from Purple Mtn. Obs. Xuyi Station (June 6.60-63p3)
K17W14H 2017 WH14 (arc=2 opp, H=18.1 ~812m) from Steward Mt. Lemmon Sta. (June 7.45p4)
K17V15L 2017 VL15 (arc=2 opp, H=21.1 ~204m) from Steward Mt. Lemmon Sta. (June 7.37-38p4)
K15X01K 2015 XK1 (arc=4 opp, H=19.9 ~355m) from ATLAS Haleakala (June 6.57-62p4)
K15W09G 2015 WG9 (arc=2 opp, H=20.3 ~295m) from UH/Tholen NEO Follow-Up CFH Telescope (May 15.26p3 at G=22.96-23.39) and UH/Tholen NEO Follow-Up 2.24m Telescope (May 16.26p1 at G=23.53)
K15FB8P 2015 FP118 (arc=2 opp, H=19.3 ~467m) from CSS (June 6.23-24p4) and PS1 (June 6.27-31p4)
K12XD4S 2012 XS134 (arc=3 opp, H=18.4 ~708m) from PS1 (June 6.41-44p4)
K12R16S 2012 RS16 (arc=3 opp, H=21.2 ~195m) from PS1 (June 6.36-40p3)
K12M04R 2012 MR4 (i=53.1°, arc=4 opp, H=17.6 ~1.02 km) from Steward Mt. Lemmon Sta. (June 7.39-41p4)
K09X02R 2009 XR2 (arc=5 opp, H=18.6 ~645m) from PS1 (June 6.50-52p3)
K07E00M 2007 EM (arc=2 opp, H=20.8 ~234m) from ARO Westfield (June 4.13-16p3 at G=21.6-22.2)
K04L00H 2004 LH (i=39.5°, arc=4 opp, H=18.8 ~589m) from ATLAS Mauna Loa (June 6.28-30p4)
K04L00B 2004 LB (i=37.3°, arc=2 opp, H=21.6 ~162m) from Holmes/CTIO (June 7.05-06p4 & 7.20p3) and Steward Mt. Lemmon Sta. (June 7.15p4)
K02U11K 2002 UK11 (arc=3 opp, H=21.7 ~155m) from Spacewatch 1.8m (June 7.43-44p3)
p8635 518635 2008 HO3 from CSS (June 6.34-35p3)
p8469 518469 2005 LH8 from ATLAS Mauna Loa (June 6.55-57p4)
p8463 518463 2005 JY80 from WISE (June 4.49p1, 4.56p1, 4.62p1, 4.69p2, 4.75p1, 4.88p1, 5.15p1, 5.21p1, 5.28p1, 5.34p1, 5.41p1, 5.47p1, 5.54p2, 5.60p1, 5.67p1, 5.87p1 & 5.93p1)
p8424 518424 2000 WK107 from PS1 (June 6.37-40p3)
p6976 516976 2012 HM1 from ATLAS Haleakala (June 6.46-50p4)
p6457 516457 2005 HM3 from MLS (June 6.18-19p4)
p4652 514652 2005 SC71 from MLS (June 6.22-24p4)
o8767 508767 1993 BD2 from CSS (June 6.36-37p3)
o5178 505178 2012 TV78 from PS1 (June 6.42-45p4)
n5615 495615 2015 PQ291 from CSS (June 6.18-19p4)
l5967 475967 2007 JF22 from CSS (June 6.22-24p4) and Xuyi Sta. (June 6.51-55p6)
k7309 467309 1996 AW1 from CSS (June 6.38-40p4)
j8122 458122 2010 EW45 from PS1 (June 6.32-35p4)
j5550 455550 2004 JO2 from ATLAS Haleakala (June 6.56-57p3)
j0648 450648 2006 UC63 from ATLAS Haleakala (June 6.45-49p8)
i5267 445267 2009 SD229 from CSS (June 6.40-42p4)
i4935 444935 2008 CQ1 from ATLAS Mauna Loa (June 6.49-53p6)
h9313 439313 2012 VE82 from ATLAS Haleakala (June 6.36-40p7)
e5212 405212 2003 QC10 from ATLAS Mauna Loa (June 6.28-29p3)
b4851 374851 2006 VV2 from ATLAS Mauna Loa (June 6.25-27p3)
S3729 283729 2002 UX from PS1 (June 6.49-53p8)
M0839 220839 2004 VA from CSS (June 6.29-31p4)
K9924 209924 2005 WS55 from ATLAS Mauna Loa (June 6.37-40p6)
G4400 164400 2005 GN59 from PS1 (June 6.36-40p3)
G4201 164201 2004 EC from ATLAS Haleakala (June 6.28-32p6)
G4121 164121 2003 YT1 from ATLAS Mauna Loa (June 6.24-26p4)
G2168 162168 1999 GT6 from N.V. Maigurova via Nikolaev Obs. (June 2.01-02p6 & 2.97-99p9)
G2120 162120 1998 SH36 from CSS (June 6.40-42p2)
F9533 159533 2001 HH31 from CSS (June 6.29-31p4)
F4268 154268 2002 RM129 from CSS (June 6.38-40p4)
F2931 152931 2000 EA107 from ATLAS Haleakala (June 6.29-33p8)
E3637 143637 2003 LP6 from ARO Westfield (June 4.18-21p3)
D9359 139359 2001 ME1 from CSS (June 6.31-33p2) and PS1 (June 6.37-39p3)
D9345 139345 2001 KA67 from Maigurova/Nikolaev Obs. (May 30.98-99p9, June 1.96-97p4 & 2.99-02p10) and ATLAS Haleakala (June 6.56-60p4)
D6839 136839 1997 WT22 from MASTER IAC Obs. (June 6.09-12p5) and ATLAS Mauna Loa (June 6.39-42p6)
96189 96189 Pygmalion (1991 NT3) from ATLAS Mauna Loa (June 6.50-51p4)
88254 88254 2001 FM129 from PS1 (June 6.32-35p3)
86067 86067 1999 RM28 from PS1 (June 6.55-59p4)
85989 85989 1999 JD6 from MLS (June 6.18-19p4) and ATLAS Haleakala (June 6.36-39p4)
85628 85628 1998 KV2 from CSS (June 6.29-31p4)
68950 68950 2002 QF15 from Mulheim-Ruhr Obs. (June 6.96-02p3)
68350 68350 2001 MK3 from ATLAS Haleakala (June 6.52-56p4), PS1 (June 6.55-59p4), and Squirrel Valley Obs. (June 7.11-12p3)
68348 68348 2001 LO7 from CSS (June 6.18-20p4)
66391 66391 1999 KW4 from Maigurova/Nikolaev Obs. (June 1.88-90p7 & 2.87-89p8), West Park Obs. (June 5.94-96p3), and ATLAS Haleakala (June 6.44-47p4)
66253 66253 1999 GT3 from ARO Westfield (June 4.23-27p3)
65996 65996 1998 MX5 from CSS (June 6.38-39p3)
36183 36183 1999 TX16 from CSS (June 6.27-28p4)
27346 27346 2000 DN8 from MLS (June 6.16-17p4)
25916 25916 2001 CP44 from CSS (June 6.37-39p4) and MASTER-II Kislovodsk (June 6.97p2)
24475 24475 2000 VN2 from PS1 (June 6.43-45p3)
18882 18882 1999 YN4 from ATLAS Mauna Loa (June 6.55-58p7)
17181 17181 1999 UM3 from ATLAS Haleakala (June 6.30-33p5)
16834 16834 1997 WU22 from CSS (June 6.42-44p4)
15745 15745 Yuliya (1991 PM5) from ATLAS Haleakala (June 6.49-52p4)
06456 6456 Golombek (1992 OM) from ATLAS Mauna Loa (June 6.55-57p4)
05646 5646 1990 TR from ATLAS Mauna Loa (June 6.37-39p4)
05626 5626 1991 FE from PS1 (June 6.37-40p4)
04257 4257 Ubasti (1987 QA) from MLS (June 6.33-34p4)
03552 3552 Don Quixote (1983 SA) from Campo Catino Austral Obs. (CAO) (June 7.36-38p3)
02061 2061 Anza (1960 UA) from CSS (June 6.40-42p4)
02059 2059 Baboquivari (1963 UA) from PS1 (June 6.36-40p4)
01916 1916 Boreas (1953 RA) from ATLAS Mauna Loa (June 6.35-37p4)
01685 1685 Toro (1948 OA) from CSS (June 6.18-20p4) and ATLAS Mauna Loa (June 6.33-35p5)
01627 1627 Ivar (1929 SH) from ATLAS Haleakala (June 6.41-45p4) and CSS (June 7.29-31p4)
00719 719 Albert (1911 MT) from Squirrel Valley Obs. (June 7.15-18p3)

MPEC 2018-L19 - "02:37 UT" - 2017 MD7

K17M07D 2017 MD7 (H=20.6 ~257m) from Holmes/CTIO (June 5.10p3 & 6.99p4)

MPEC 2018-L18 - "02:35 UT" - 2015 MO130

K15MD0O 2015 MO130 (H=21.7 ~155m) from Tholen 2.24m (May 16.45-48p3 at G=24.40-66 & 22.41-43p3 at G=24.01-51)

Observers on 7 June '18

A total of 38 observers appear in today's MPECs.

Code	Observer / observatory
`E23`	Arcadia Obs. in New South Wales, 1 in MPEC 2018-L26 -- 2018 LG1
`H21`	Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2018-L20 -- 2018 LM, 2018 KQ1, 2007 EM, 66253, 143637
`T05`	ATLAS Haleakala in Hawaii, 15 in MPEC 2018-L20 -- 2018 EJ4, 2015 XK1, 85989, 68350, 66391, 516976, 455550, 450648, 439313, 17181, 164201, 15745, 152931, 139345, 1627
`T08`	ATLAS Mauna Loa in Hawaii, 14 in MPEC 2018-L20 -- 2004 LH, 96189, 518469, 444935, 405212, 374851, 209924, 18882, 164121, 136839, 6456, 5646, 1916, 1685
`W96`	Campo Catino Austral Obs. in Chile, 1 in MPEC 2018-L20 -- 3552
`703`	Catalina Sky Survey (CSS) in Arizona, 24 in MPECs 2018-L20 & 2018-L26 -- 2018 LG1, 2018 JE1, 2015 FP118, 85628, 68348, 65996, 518635, 508767, 495615, 475967, 467309, 445267, 36183, 25916, 220839, 16834, 162120, 159533, 154268, 139359, 5604, 2061, 1685, 1627
`807\|`	Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPECs 2018-L19, 2018-L20, 2018-L21, 2018-L23, 2018-L24, 2018-L25, 2018-L27 & 2018-L28 -- 2018 LK, 2018 LJ1, 2018 LH1, 2018 LF1, 2018 LE1, 2018 LD1, 2018 LB1, 2018 KE3, 2017 MD7, 2004 LB
`J95`	Great Shefford Obs. in England, 3 in MPECs 2018-L20, 2018-L22 & 2018-L26 -- 2018 LG1, 2018 LC1, 2018 EJ4
`A17`	Guidestar Obs. in Germany, 1 in MPEC 2018-L22 -- 2018 LC1
`P93`	JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-L22 -- 2018 LC1
`585`	Kiev Comet Station in Ukraine, 1 in MPEC 2018-L26 -- 2018 LG1
`Z22`	MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-L20 -- 136839
`C41`	MASTER-II Kislovodsk in Russia, 1 in MPEC 2018-L20 -- 25916
`568^`	R. Wainscoat on Mauna Kea in Hawaii, 3 in MPECs 2018-L21, 2018-L23 & 2018-L24 -- 2018 LE1, 2018 LD1, 2018 LB1
`568_`	Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2018-L25 -- 2018 LF1
`474`	Mt. John Obs. in New Zealand, 1 in MPEC 2018-L28 -- 2018 LJ1
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2018-L20 & 2018-L22 -- 2018 LC1, 2018 KU1, 85989, 516457, 514652, 27346, 4257
`628`	Mulheim-Ruhr Obs. in Germany, 1 in MPEC 2018-L20 -- 68950
`0895`	N.V. Maigurova via Nikolaev Obs. in Ukraine, 3 in MPEC 2018-L20 -- 66391, 162168, 139345
`Z80`	Northolt Branch Obs. in England, 1 in MPEC 2018-L20 -- 2015 DP155
`G34`	Oberfrauendorf Obs. in Germany, 1 in MPEC 2018-L20 -- 2015 DP155
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 25 in MPECs 2018-L20, 2018-L21, 2018-L23, 2018-L24, 2018-L25, 2018-L26, 2018-L27 & 2018-L28 -- 2018 LJ1, 2018 LH1, 2018 LG1, 2018 LF1, 2018 LE1, 2018 LD1, 2018 LB1, 2018 KM1, 2018 KC2, 2015 FP118, 2012 XS134, 2012 RS16, 2009 XR2, 88254, 86067, 68350, 518424, 505178, 458122, 283729, 24475, 164400, 139359, 5626, 2059
`F52`	Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-L20 -- 1999 LK1
`K63`	Pascoli Obs. in Italy, 1 in MPEC 2018-L26 -- 2018 LG1
`D29`	Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2018-L20 -- 2018 BY2, 475967
`W71`	Rand II Obs. in New York, 1 in MPEC 2018-L20 -- 2018 EJ4
`L04`	ROASTERR-1 in Romania, 2 in MPEC 2018-L20 -- 2018 EJ4, 2015 DP155
`H36`	Sandlot Obs. in Kansas, 2 in MPECs 2018-L22 & 2018-L25 -- 2018 LF1, 2018 LC1
`G40(`	program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-L26 -- 2018 LG1
`691`	Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2018-L20, 2018-L23, 2018-L25 & 2018-L27 -- 2018 LH1, 2018 LF1, 2018 LD1, 2018 KL2, 2018 KC3, 2018 KC2
`291`	Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2018-L20, 2018-L21, 2018-L24 & 2018-L25 -- 2018 LM, 2018 LF1, 2018 LE1, 2018 LC, 2018 LB1, 2002 UK11
`W34`	Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-L20 -- 68350, 719
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 22 in MPECs 2018-L20, 2018-L22, 2018-L23, 2018-L24, 2018-L25, 2018-L26 & 2018-L27 -- 2018 LN, 2018 LM, 2018 LJ, 2018 LH1, 2018 LG1, 2018 LG, 2018 LF1, 2018 LE1, 2018 LD1, 2018 LC1, 2018 LC, 2018 KM2, 2018 KM1, 2018 KL2, 2018 KF3, 2018 JQ1, 2018 JD2, 2018 GQ2, 2017 WH14, 2017 VL15, 2012 MR4, 2004 LB
`T12`	UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2018-L18 & 2018-L20 -- 2015 WG9, 2015 MO130
`T14`	UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2018-L20 -- 2015 WG9
`L01`	Visnjan Obs., 3 in MPECs 2018-L22, 2018-L25 & 2018-L26 -- 2018 LG1, 2018 LF1, 2018 LC1
`Z92`	West Park Obs. in England, 1 in MPEC 2018-L20 -- 66391
`C51`	WISE in Earth polar orbit, 1 in MPEC 2018-L20 -- 518463
`E08`	Wobblesock Obs. in New South Wales, 2 in MPEC 2018-L20 -- 2018 LN, 2018 LM

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

Impact Risk Monitoring on 7 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

2018 LE1	JPL Sentry	1805	2066-2103	9	4.964507e-06	-6.87	-7.32	0	JPL: Computed at 10:34 today Pacific time based on 19 observations spanning 1.9704 days (2018-Jun-05.39422 to 2018-Jun-07.36462). Diameter approximately 0.011 km. from weighted mean H=27.53.

2018 LD1	JPL Sentry	1805	2068-2112	5	4.69878e-08	-8.20	-8.45	0	JPL: Computed at 10:33 today Pacific time based on 18 observations spanning 1.9828 days (2018-Jun-05.34064 to 2018-Jun-07.3234). Diameter approximately 0.018 km. from weighted mean H=26.37.

2018 LM	JPL Sentry	1500	R E M O V E D						JPL: Risk listing removed at 1431 UTC today

2018 LA	NEODyS	1500	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 7 June '18

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

1906	Generated Traffic Report
1805	Noted that JPL Sentry has posted 2018 LD1 as an impact risk - see above Noted that JPL Sentry has posted 2018 LE1 as an impact risk - see above
1733	Grabbed MPEC 2018-L21 - 2018 LB1 - see above Grabbed MPEC 2018-L22 - 2018 LC1 - see above Grabbed MPEC 2018-L23 - 2018 LD1 - see above Grabbed MPEC 2018-L24 - 2018 LE1 - see above Grabbed MPEC 2018-L25 - 2018 LF1 - see above Grabbed MPEC 2018-L26 - 2018 LG1 - see above Grabbed MPEC 2018-L27 - 2018 LH1 - see above Grabbed MPEC 2018-L28 - 2018 LJ1 - see above
1500	Noted that NEODyS has removed 2018 LA as an impact risk - see above Noted that JPL Sentry has removed 2018 LM as an impact risk - see above Grabbed MPEC 2018-L20 - Daily Orbit Update - see above
0311	Grabbed MPEC 2018-L18 - 2015 MO130 - see above Grabbed MPEC 2018-L19 - 2017 MD7 - see above

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