Contents  on 7 June '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 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-L28 - "16:37 UT" - 2018 LJ1


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


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


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


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


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


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


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


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


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


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

Observers  on 7 June '18

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

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-L26 -- 2018 LG1
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2018-L20 -- 2018 LM, 2018 KQ1, 2007 EM, 66253, 143637
T05ATLAS 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
T08ATLAS Mauna Loa in Hawaii, 14 in MPEC 2018-L20 -- 2004 LH, 96189, 518469, 444935, 405212, 374851, 209924, 18882, 164121, 136839, 6456, 5646, 1916, 1685
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2018-L20 -- 3552
703Catalina 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
J95Great Shefford Obs. in England, 3 in MPECs 2018-L20, 2018-L22 & 2018-L26 -- 2018 LG1, 2018 LC1, 2018 EJ4
A17Guidestar Obs. in Germany, 1 in MPEC 2018-L22 -- 2018 LC1
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-L22 -- 2018 LC1
585Kiev Comet Station in Ukraine, 1 in MPEC 2018-L26 -- 2018 LG1
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-L20 -- 136839
C41MASTER-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
474Mt. John Obs. in New Zealand, 1 in MPEC 2018-L28 -- 2018 LJ1
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2018-L20 & 2018-L22 -- 2018 LC1, 2018 KU1, 85989, 516457, 514652, 27346, 4257
628Mulheim-Ruhr Obs. in Germany, 1 in MPEC 2018-L20 -- 68950
0895N.V. Maigurova via Nikolaev Obs. in Ukraine, 3 in MPEC 2018-L20 -- 66391, 162168, 139345
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-L20 -- 2015 DP155
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2018-L20 -- 2015 DP155
F51Pan-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
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-L20 -- 1999 LK1
K63Pascoli Obs. in Italy, 1 in MPEC 2018-L26 -- 2018 LG1
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2018-L20 -- 2018 BY2, 475967
W71Rand II Obs. in New York, 1 in MPEC 2018-L20 -- 2018 EJ4
L04ROASTERR-1 in Romania, 2 in MPEC 2018-L20 -- 2018 EJ4, 2015 DP155
H36Sandlot 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
691Spacewatch 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
291Spacewatch 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
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-L20 -- 68350, 719
I52Steward 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
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2018-L18 & 2018-L20 -- 2015 WG9, 2015 MO130
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2018-L20 -- 2015 WG9
L01Visnjan Obs., 3 in MPECs 2018-L22, 2018-L25 & 2018-L26 -- 2018 LG1, 2018 LF1, 2018 LC1
Z92West Park Obs. in England, 1 in MPEC 2018-L20 -- 66391
C51WISE in Earth polar orbit, 1 in MPEC 2018-L20 -- 518463
E08Wobblesock 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 LE1JPL Sentry18052066-210394.964507e-06-6.87-7.320JPL: 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 LD1JPL Sentry18052068-211254.69878e-08-8.20-8.450JPL: 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 LMJPL Sentry1500R E M O V E DJPL: Risk listing removed at 1431 UTC today
2018 LANEODyS1500R 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.

1906Generated Traffic Report
1805Noted 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
1733Grabbed 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
1500Noted 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
0311Grabbed MPEC 2018-L18 - 2015 MO130 - see above
Grabbed MPEC 2018-L19 - 2017 MD7 - see above