2018-06-13 Tracking News

Contents on 13 June '18

Traffic Report -- eight objects
IAU Minor Planet Center
- NEOCP Activity -- 40 listings
- New MPECs -- eight MPECs
Observers -- 26 observers
Impact Risk Monitoring -- seven objects
Chronology

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page
Of 940 risk-listed objects, 29 have had news in the last 31 days. Updated at 1505 UTC on 13 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 13 June '18

Eight objects reported inside ten LD

Today eight transient natural objects are known to be less than ten lunar distances (LD) from Earth. Nearest are risk-listed 2018 LD1, which enters Earth's sphere of gravitational influence, moving in from 4.39 to 2.27 LD, and intruder 2018 LV3, inbound from 5.30 to 2.88 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
0.86 LD June 15	2018 LV3	17 m	2.88 from 5.30 LD	June 11 - 19	intruder - DOU

1.57 LD tomorrow	2018 LD1	18 m	2.27 from 4.39 LD	June 10 - 18	enters Earth SOI, risk - DOU

3.65 LD June 11	2018 LW3	22 m	4.66 to 6.20 LD	June 7 - 16	NEW - MPEC
3.93 LD June 9	2018 LR2	25 m	7.73 to 9.69 LD	June 5 - 14	risk
4.62 LD June 8	2018 LG4	12 m	9.02 to 10.68 LD	June 4 - 13	NEW, exits ten LD - MPEC

5.56 LD June 10	2018 EJ4	186 m	6.34 to 7.11 LD	June 4 - 16	radar/NHATS target
7.62 LD June 15	2018 LK	153 m	9.21 from 11.02 LD	today - June 18	enters ten LD - DOU
8.96 LD June 11	2015 DP155	162 m	9.13 to 9.38 LD	June 6 - 15	NHATS target - DOU

Approaching
6.0 LD June 29*	2018 LR3	19 m	14.5 from 15.2 LD	June 20 - July 8	Earth passage uncertainty +/- 15 mins.*, NHATS target, risk - DOU

This report was generated at 1751 UTC with the discoveries of outbound objects 2018 LG4 (MPEC) and 2018 LW3 (MPEC), and with follow-up in today's DOU MPEC for five objects in the above active traffic table, and for four departed objects: 2018 LU2, 68347 2001 KB67, and risk-listed 2018 LE1 and 2018 JG1.

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 13 June '18

The MPC's NEO Confirmation Page has 40 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 40 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 54 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 13 June '18

Minor Planet Electronic Circulars

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

MPEC 2018-L64 time-stamped "10:19 UT" - 2018 LW3 - see below
MPEC 2018-L65 time-stamped "10:31 UT" - 2004 RO111 - see below
MPEC 2018-L66 time-stamped "10:34 UT" - 2005 KP9 - see below
MPEC 2018-L67 time-stamped "12:03 UT" - Daily Orbit Update - see below
MPEC 2018-L68 time-stamped "14:26 UT" - 2018 LD4 - see below
MPEC 2018-L69 time-stamped "14:30 UT" - 2018 LE4 - see below
MPEC 2018-L70 time-stamped "14:34 UT" - 2018 LF4 - see below
MPEC 2018-L71 time-stamped "14:38 UT" - 2018 LG4

MPEC 2018-L71 - "14:38 UT" - 2018 LG4

K18L04G 2018 LG4 (Earth MOID=4.6 LD, H=27.3 ~12m) was picked up at 0727 UT on 12 June by the Mt. Lemmon Survey (MLS), observing it at June 12.31-33p3. This detection was confirmed by Steward Obs. Mt. Lemmon Station (June 12.36-40p8 & 13.29p4), ESA Optical Ground Station (ESA OGS) (June 12.91p3), and Great Shefford Obs. (June 13.01-02p3).

MPEC 2018-L70 - "14:34 UT" - 2018 LF4

K18L04F 2018 LF4 (small asteroid, H=24.2 ~49m) was picked up at 0625 UT on 11 June by MLS, observing it at June 11.27-28p4. This detection was confirmed by the Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) (June 11.34-35p4) and Steward Mt. Lemmon Sta. (June 12.20-21p3 & 13.32-33p3).

MPEC 2018-L69 - "14:30 UT" - 2018 LE4

K18L04E 2018 LE4 (small asteroid, Earth MOID=7.1 LD, H=23.8 ~59m) was picked up at 0622 UT on 11 June by the Catalina Sky Survey (CSS), observing it at June 11.27-28p3. This detection was confirmed by Steward Mt. Lemmon Sta. (June 11.32p4, 12.19p4 & 13.29p4), Visnjan Obs. (June 11.90-91p3), ESA OGS (June 11.92p3), Golden Hill Obs. (June 12.00-02p3), Great Shefford Obs. (June 12.04p3 & 12.99p3), and Wobblesock Obs. (June 12.40-41p3).

MPEC 2018-L68 - "14:26 UT" - 2018 LD4

K18L04D 2018 LD4 (small asteroid, Earth MOID=8.2 LD, H=24.8 ~37m) was picked up at 0531 UT on 11 June by MLS, observing it at June 11.23-24p3 and 12.21-22p4. This detection was confirmed by Steward Mt. Lemmon Sta. (June 11.29-30p4, 12.16p4 & 13.29p4) and Great Shefford Obs. (June 12.95-96p3).

<< DOU on 13 June '18 >> MPEC 2018-L67 - "12:03 UT" - Daily Orbit Update

Observations of risk-listed objects
K18L03R 2018 LR3 (small asteroid, arc=3 days, H=26.2 ~19m, close passer, NHATS target) from the Spacewatch 0.9m telescope (June 13.18-19p2)
K18L01E 2018 LE1 (small asteroid, arc=8 days, H=27.5 ~11m, close passer, NHATS target) from the Spacewatch 1.8m telescope (June 13.36-38p3)
K18L01D 2018 LD1 (small asteroid, arc=7 days, H=26.2 ~19m, close passer) from ATLAS Haleakala (June 12.40-42p4)
K18L01B 2018 LB1 (Q=4.581 AU, arc=24 days, H=20.0 ~339m) from Discovery Channel Telescope (DCT) (June 12.17-19p10)
K18J01G 2018 JG1 (small asteroid, arc=33 days, H=24.5 ~43m, close passer) from Sertao de Itaparica Obs. (OASI) (June 10.29-32p2)
K18H02J 2018 HJ2 (small asteroid, Q=4.015 AU, arc=30 days, H=24.6 ~41m) from Astronomical Research Obs. Westfield (May 17.20-24p3 at V=23.1-3)
Observations of recently (no longer) risk-listed objects
K18J02C 2018 JC2 (small asteroid, Q=5.047 AU, arc=14 days, H=22.8 ~93m) from ARO Westfield (May 22.16-18p3 at V=22.1-4)
Observations of close-passing objects
K18L03V 2018 LV3 (arc=2 days, H=26.5 ~17m) from Great Shefford Obs. (June 12.99-01p3)
K18L02U 2018 LU2 (arc=6 days, H=26.7 ~15m, NHATS target) from Spacewatch 0.9m (June 13.37p2)
K18L00K 2018 LK (arc=56 days, H=21.7 ~155m) from Northolt Branch Obs. (June 12.02-03p9)
K15DF5P 2015 DP155 (arc=2 opp, H=21.5 ~170m, NHATS target) from ATLAS Mauna Loa (June 12.55-56p4)
68347 68347 2001 KB67 (radar support) from N.V. Maigurova via Nikolaev Obs. (June 6.87-89p8) and ATLAS Mauna Loa (June 12.46-49p3)
Observation campaigns (NHATS targets, radar support)
K18L03O 2018 LO3 (arc=8 days, H=25.6 ~26m, NHATS) from Dave Balam via Plaskett 1.8m Telescope (June 12.33-34p3)
K18L02V 2018 LV2 (arc=6 days, H=25.1 ~32m, NHATS) from Steward Mt. Lemmon Sta. (June 13.31p3)
K18L02Q 2018 LQ2 (arc=8 days, H=24.7 ~39m, NHATS) from Chabot Obs. (June 13.28-30p3) and Steward Mt. Lemmon Sta. (June 13.33-34p4)
K18L01J 2018 LJ1 (arc=7 days, H=26.5 ~17m, NHATS) from DCT (June 12.21-24p9)
K18L01C 2018 LC1 (arc=8 days, H=24.8 ~37m, NHATS) from Chabot Obs. (June 13.26-27p3) and Steward Mt. Lemmon Sta. (June 13.30p4)
K17M08T 2017 MT8 (arc=2 opp, H=23.2 ~78m, NHATS) from ARO Westfield (May 17.34-38p3 at V=22.1-3)
K10M01S 2010 MS1 (arc=2 opp, H=21.9 ~141m, NHATS) from MLS (June 12.25-26p4)
-- NHATS target table -- Planetary radar schedules: Arecibo & Goldstone
Observations of small asteroids (H>22.0)
K18L03Q 2018 LQ3 (i=36.2°, arc=3 days, H=22.2 ~123m) from Great Shefford Obs. (June 12.92-93p4)
K18L03D 2018 LD3 (arc=5 days, H=23.7 ~62m) from Steward Mt. Lemmon Sta. (June 13.35-36p3)
K18L01G 2018 LG1 (arc=7 days, H=23.3 ~74m) from Steward Mt. Lemmon Sta. (June 13.30p4)
K18L01F 2018 LF1 (arc=8 days, H=24.5 ~43m) from Steward Mt. Lemmon Sta. (June 13.30p4)
K18K03C 2018 KC3 (arc=19 days, H=23.1 ~81m) from ATLAS Mauna Loa (June 12.38-41p4)
Observations of other objects
K18L03E 2018 LE3 (Q=4.121 AU, arc=5 days, H=21.3 ~186m) from Steward Mt. Lemmon Sta. (June 13.35p4)
K18J01S 2018 JS1 (Q=4.378 AU, arc=60 days, H=20.3 ~295m) from CSS (June 12.29-31p2)
K18G04M 2018 GM4 (arc=54 days, H=21.5 ~170m) from ARO Westfield (May 23.17-21p3 at V=22.2-5)
K18F03L 2018 FL3 (i=39.0°, arc=65 days, H=20.4 ~282m) from ARO Westfield (May 23.11-14p3 at V=22.0-22.3)
K18B02Y 2018 BY2 (arc=160 days, H=20.5 ~269m) from MLS (June 12.27-29p4)
K18A12P 2018 AP12 (Q=4.423 AU, arc=150 days, H=20.9 ~224m) from Steward Mt. Lemmon Sta. (June 13.45-46p2)
K17X62J 2017 XJ62 (Q=4.429 AU, arc=160 days, H=21.0 ~214m) from ARO Westfield (May 23.17-20p3 at V=22.1-5)
K17W14H 2017 WH14 (arc=2 opp, H=18.0 ~851m) from the Palomar Transient Factory (PTF) (June 10.25-30p4)
K17G07M 2017 GM7 (arc=191 days, H=18.8 ~589m) from UH/Tholen NEO Follow-Up 2.24m Telescope (2017 May 27.26p2)
K15X55P 2015 XP55 (i=42.2°, arc=2 opp, H=21.6 ~162m) from ARO Westfield (May 17.27-31p3 at V=22.2-5)
K15TE3X 2015 TX143 (arc=4 opp, H=19.8 ~371m) from MLS (June 12.23-25p4)
K15H10H 2015 HH10 (arc=4 opp, H=18.5 ~676m) from MLS (June 12.45p4)
K14QQ6P 2014 QP266 (arc=2 opp, H=19.6 ~407m) from Pan-STARRS 1 (PS1) (June 12.42-46p3)
K12U27V 2012 UV27 (arc=3 opp, H=19.4 ~446m) from ATLAS Haleakala (June 12.56-59p4)
K09O00G 2009 OG (i=48.4°, q=0.382 AU, Q=5.027 AU, arc=5 opp, H=16.2 ~1.95 km) from SONEAR (June 12.24-25p3)
K05Y93W 2005 YW93 (Q=4.091 AU, arc=3 opp, H=19.3 ~467m) from MLS (June 12.27-29p4)
K05M01X 2005 MX1 (arc=3 opp, H=19.4 ~446m) from MLS (June 12.41-42p4)
K05E29Z 2005 EZ29 (arc=3 opp, H=20.3 ~295m) from Spacewatch 0.9m (June 13.38-41p3)
K01SH0C 2001 SC170 (arc=2 opp, H=20.5 ~269m) from CSS (June 12.29-31p3)
p8635 518635 2008 HO3 from MLS (June 12.29-31p4)
p8469 518469 2005 LH8 from ATLAS Haleakala (June 12.56-58p4)
p8426 518426 2002 ON4 from MLS (June 12.29-31p4)
p4652 514652 2005 SC71 from CSS (June 12.27-29p3)
j5550 455550 2004 JO2 from ATLAS Mauna Loa (June 12.51-54p4)
h8430 438430 2006 WL3 from MLS (June 12.23-25p4)
f8929 418929 2009 DM1 from MLS (June 12.38-40p4)
e5212 405212 2003 QC10 from ATLAS Haleakala (June 12.31-33p4)
b4851 374851 2006 VV2 from ATLAS Haleakala (June 12.26-29p7)
S3729 283729 2002 UX from ATLAS Haleakala (June 12.48-50p3)
I9173 189173 2002 XY4 from MLS (June 12.36-38p4)
H4050 174050 2002 CC19 from PS1 (June 12.31-34p3)
G2783 162783 2000 YJ11 from PS1 (June 12.48-51p3)
F4268 154268 2002 RM129 from MLS (June 12.32-33p3)
F2931 152931 2000 EA107 from PS1 (June 12.27-29p4)
E1851 141851 2002 PM6 from MLS (June 12.44-46p4)
D8847 138847 2000 VE62 from CSS (June 12.29-31p4)
D6818 136818 Selqet (1997 MW1) from MLS (June 12.41-42p3)
96189 96189 Pygmalion (1991 NT3) from ATLAS Haleakala (June 12.49-50p3) and N. Falla via iTelescope Obs. Siding Spring (June 12.62-65p3)
86829 86829 2000 GR146 from PS1 (June 12.47-51p4)
85989 85989 1999 JD6 from ATLAS Mauna Loa (June 12.34-39p7)
68950 68950 2002 QF15 from MASTER-II Tunka (June 11.75-76p2)
68350 68350 2001 MK3 from PTF (June 12.27-38p7)
66400 66400 1999 LT7 from ATLAS Haleakala (June 12.44-47p4)
66391 66391 1999 KW4 from CSS (June 12.27-29p4) and ATLAS Mauna Loa (June 12.38-42p4)
65706 65706 1992 NA from SONEAR (June 12.26-28p3) and ATLAS Haleakala (June 12.60-61p3)
53110 53110 1999 AR7 from PTF (June 10.18-20p4) and CSS (June 12.16-18p3)
18882 18882 1999 YN4 from ATLAS Haleakala (June 12.55-57p6)
17274 17274 2000 LC16 from ATLAS Haleakala (June 12.48-49p3)
15745 15745 Yuliya (1991 PM5) from PTF (June 12.26-27p3 & 12.32-38p5)
12923 12923 Zephyr (1999 GK4) from MLS (June 12.16-18p4)
11066 11066 Sigurd (1992 CC1) from PS1 (June 12.27-28p3)
08709 8709 Kadlu (1994 JF1) from MLS (June 12.16-18p4)
08566 8566 1996 EN from PS1 (June 12.27-29p4)
07977 7977 1977 QQ5 from PS1 (June 12.27-28p3)
06456 6456 Golombek (1992 OM) from ATLAS Haleakala (June 12.56-58p6)
05646 5646 1990 TR from ATLAS Haleakala (June 12.37-39p4)
04257 4257 Ubasti (1987 QA) from CSS (June 12.36-37p4)
03752 3752 Camillo (1985 PA) from CSS (June 12.19-22p8)
01916 1916 Boreas (1953 RA) from ATLAS Haleakala (June 12.33-36p4)
01866 1866 Sisyphus (1972 XA) from CSS (June 12.20-22p4)
01685 1685 Toro (1948 OA) from ATLAS Haleakala (June 12.33-35p4)
01627 1627 Ivar (1929 SH) from ATLAS Mauna Loa (June 12.40-43p4)
00433 433 Eros (1898 DQ) from MLS (June 12.44-47p4)

MPEC 2018-L66 - "10:34 UT" - 2005 KP9

K05K09P 2005 KP9 (H=21.2 ~195m) from PS1 (March 8.60-64p6 & June 12.48-50p3)

MPEC 2018-L65 - "10:31 UT" - 2004 RO111

K04RB1O 2004 RO111 (Earth MOID=9.3 LD, H=23.2 ~78m, NHATS) from MLS (June 11.36-38p4) and Steward Mt. Lemmon Sta. (June 11.43p4 & 12.22p4)

MPEC 2018-L64 - "10:19 UT" - 2018 LW3

K18L03W 2018 LW3 (Earth MOID=3.2 LD, H=25.9 ~22m) was picked up at 1019 UT on 12 June by ATLAS Haleakala, observing it at June 12.41-43p4. This detection was confirmed by ATLAS Mauna Loa (June 11.44-48p2) and SONEAR (June 13.17-18p7).

Observers on 13 June '18

A total of 26 observers appear in today's MPECs.

Code	Observer / observatory
`H21`	Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2018-L67 -- 2018 JC2, 2018 HJ2, 2018 GM4, 2018 FL3, 2017 XJ62, 2017 MT8, 2015 XP55
`T05`	ATLAS Haleakala in Hawaii, 16 in MPECs 2018-L64 & 2018-L67 -- 2018 LW3, 2018 LD1, 2012 UV27, 96189, 66400, 65706, 518469, 405212, 374851, 283729, 18882, 17274, 6456, 5646, 1916, 1685
`T08`	ATLAS Mauna Loa in Hawaii, 8 in MPECs 2018-L64 & 2018-L67 -- 2018 LW3, 2018 KC3, 2015 DP155, 85989, 68347, 66391, 455550, 1627
`703`	Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2018-L67 & 2018-L69 -- 2018 LE4, 2018 JS1, 2001 SC170, 66391, 53110, 514652, 138847, 4257, 3752, 1866
`V06`	Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-L70 -- 2018 LF4
`G58`	Chabot Obs. in northern California, 2 in MPEC 2018-L67 -- 2018 LQ2, 2018 LC1
`G37`	Discovery Channel Telescope (DCT) in Arizona, 2 in MPEC 2018-L67 -- 2018 LJ1, 2018 LB1
`J04`	ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPECs 2018-L69 & 2018-L71 -- 2018 LG4, 2018 LE4
`J77`	Golden Hill Obs. in England, 1 in MPEC 2018-L69 -- 2018 LE4
`J95`	Great Shefford Obs. in England, 5 in MPECs 2018-L67, 2018-L68, 2018-L69 & 2018-L71 -- 2018 LV3, 2018 LQ3, 2018 LG4, 2018 LE4, 2018 LD4
`Q628`	N. Falla in England via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-L67 -- 96189
`C94`	MASTER-II Tunka in Russia, 1 in MPEC 2018-L67 -- 68950
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 21 in MPECs 2018-L65, 2018-L67, 2018-L68, 2018-L70 & 2018-L71 -- 2018 LG4, 2018 LF4, 2018 LD4, 2018 BY2, 2015 TX143, 2015 HH10, 2010 MS1, 2005 YW93, 2005 MX1, 2004 RO111, 518635, 518426, 438430, 418929, 189173, 154268, 141851, 136818, 12923, 8709, 433
`0895`	N.V. Maigurova via Nikolaev Obs. in Ukraine, 1 in MPEC 2018-L67 -- 68347
`Z80`	Northolt Branch Obs. in England, 1 in MPEC 2018-L67 -- 2018 LK
`I41`	Palomar Transient Factory (PTF) in southern California, 4 in MPEC 2018-L67 -- 2017 WH14, 68350, 53110, 15745
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2018-L66 & 2018-L67 -- 2014 QP266, 2005 KP9, 86829, 174050, 162783, 152931, 11066, 8566, 7977
`6581`	Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2018-L67 -- 2018 LO3
`Y28`	Sertao de Itaparica Obs. in Brazil, 1 in MPEC 2018-L67 -- 2018 JG1
`Y00`	SONEAR in Brazil, 3 in MPECs 2018-L64 & 2018-L67 -- 2018 LW3, 2009 OG, 65706
`691`	Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2018-L67 -- 2018 LU2, 2018 LR3, 2005 EZ29
`291`	Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-L67 -- 2018 LE1
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 13 in MPECs 2018-L65, 2018-L67, 2018-L68, 2018-L69, 2018-L70 & 2018-L71 -- 2018 LV2, 2018 LQ2, 2018 LG4, 2018 LG1, 2018 LF4, 2018 LF1, 2018 LE4, 2018 LE3, 2018 LD4, 2018 LD3, 2018 LC1, 2018 AP12, 2004 RO111
`T12`	UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-L67 -- 2017 GM7
`L01`	Visnjan Obs., 1 in MPEC 2018-L69 -- 2018 LE4
`E08`	Wobblesock Obs. in New South Wales, 1 in MPEC 2018-L69 -- 2018 LE4

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

Impact Risk Monitoring on 13 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 LR3	JPL Sentry	1504	2077-2109	9	4.094632e-06	-6.33	-6.54	0	JPL: Computed at 07:34 today Pacific time based on 17 observations spanning 2.8649 days (2018-Jun-10.32538 to 2018-Jun-13.1903). Diameter approximately 0.019 km. from weighted mean H=26.25.

2018 LE1	JPL Sentry	1504	2066-2102	3	1.4435318e-06	-7.51	-7.53	0	JPL: Computed at 07:36 today Pacific time based on 45 observations spanning 7.9845 days (2018-Jun-05.39422 to 2018-Jun-13.37872). Diameter approximately 0.010 km. from weighted mean H=27.66.
2018 LE1	NEODyS	1504	2066-2103	6	2.55e-06	-7.28	-7.29	0	NEODyS: "Based on 43 optical observations (of which 1 are rejected as outliers) from 2018-06-05.395 to 2018-06-12.300."

2018 LD1	JPL Sentry	1504	R E M O V E D						JPL: Risk listing removed at 1420 UTC today
2018 LD1	NEODyS	1504	2089-2116	3	8.55e-08	-8.01	-8.2	0	NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2018-06-05.341 to 2018-06-12.069."

2018 LB1	JPL Sentry	1504	2032-2073	3	3.279856e-05	-1.61	-1.61	1	JPL: Computed at 07:10 today Pacific time based on 55 observations spanning 23.805 days (2018-May-19.425541 to 2018-Jun-12.23056). Diameter approximately 0.330 km. from weighted mean H=20.03.
2018 LB1	NEODyS	1504	2032-2063	6	2.25e-05	-1.82	-1.82	1	NEODyS: "Based on 55 optical observations (of which 0 are rejected as outliers) from 2018-05-19.426 to 2018-06-12.231."

2018 LM	NEODyS	1504	2112	2	1.0e-06	-6.55	-6.85	0	NEODyS: "Based on 74 optical observations (of which 0 are rejected as outliers) from 2018-06-04.255 to 2018-06-11.905."

2018 JG1	JPL Sentry	1504	2118-2118	1	3.044e-08	-7.66	-7.66	0	JPL: Computed at 07:10 today Pacific time based on 77 observations spanning 33.138 days (2018-May-08.17968 to 2018-Jun-10.317922). Diameter approximately 0.043 km. from weighted mean H=24.48.

2018 HJ2	JPL Sentry	1504	2085-2085	1	2.425e-08	-7.65	-7.65	0	JPL: Computed at 07:07 today Pacific time based on 106 observations spanning 30.049 days (2018-Apr-23.41101 to 2018-May-23.46042). Diameter approximately 0.041 km. from weighted mean H=24.58.

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 13 June '18

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

1751

Generated Traffic Report

1504

Noted that JPL Sentry has updated its 2018 HJ2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 JG1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 LB1 risk assessment - see above
Noted that NEODyS has updated its 2018 LB1 risk assessment - see above
Noted that JPL Sentry has removed 2018 LD1 as an impact risk - see above
Noted that NEODyS has updated its 2018 LD1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 LE1 risk assessment - see above
Noted that NEODyS has updated its 2018 LE1 risk assessment - see above
Noted that NEODyS has updated its 2018 LM risk assessment - see above
Noted that JPL Sentry has updated its 2018 LR3 risk assessment - see above
Grabbed MPEC 2018-L64 - 2018 LW3 - see above
Grabbed MPEC 2018-L65 - 2004 RO111 - see above
Grabbed MPEC 2018-L66 - 2005 KP9 - see above
Grabbed MPEC 2018-L67 - Daily Orbit Update - see above
Grabbed MPEC 2018-L68 - 2018 LD4 - see above
Grabbed MPEC 2018-L69 - 2018 LE4 - see above
Grabbed MPEC 2018-L70 - 2018 LF4 - see above
Grabbed MPEC 2018-L71 - 2018 LG4 - see above

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