Contents  on 5 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 5 June '18

Three objects reported inside ten LD

Two small celestial objects are reported less than ten (but more than six) lunar distances (LD) from Earth today. Risk-listed 2018 LB is outbound from 6.83 to 8.41 LD and 2018 EJ4 is inbound from 9.80 to 8.69 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
2.14 LD June 1 2018 LB 21 m  6.83 to 8.41 LD May 26 - tomorrow NHATS target, risk
5.56 LD June 10 2018 EJ4 186 m  8.69 from 9.80 LD yesterday - June 16 radar/NHATS target - DOU
Approaching
8.96 LD June 11 2015 DP155 162 m  10.35 from 10.88 LD tomorrow - June 15 NHATS target - DOU

This report was generated at 2136 UTC with follow-up in today's DOU MPEC for approaching 2015 DP155, inbound 2018 EJ4, and departed objects 2018 JM and 2014 JR25.



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 5 June '18

The MPC's NEO Confirmation Page has 26 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 26 objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 32 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 5 June '18

Minor Planet Electronic Circulars

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


<< DOU on 5 June '18 >>  MPEC 2018-L12 - "12:02 UT" - Daily Orbit Update


MPEC 2018-L11 - "10:55 UT" - 2018 LG


MPEC 2018-L10 - "10:52 UT" - 2018 LJ


MPEC 2018-L09 - "10:45 UT" - 2018 LH

Observers  on 5 June '18

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2018-L10 & 2018-L12 -- 2018 LJ, 2018 KP, 2018 KN1, 2018 GM4, 2018 GL, 2017 SB14, 2015 XP55, 2015 JP, 2014 JR25
T05ATLAS Haleakala in Hawaii, 6 in MPEC 2018-L12 -- 2004 LH, 405212, 374851, 164121, 136839, 1685
T08ATLAS Mauna Loa in Hawaii, 11 in MPEC 2018-L12 -- 2018 EJ4, 68350, 66391, 516976, 455550, 450648, 163243, 15745, 152931, 139345, 1627
703Catalina Sky Survey (CSS) in Arizona, 18 in MPECs 2018-L10 & 2018-L12 -- 2018 LJ, 2018 JE5, 2018 JE1, 2014 WO7, 2013 QH10, 1999 LK1, 85628, 66251, 54401, 495615, 467309, 415029, 38091, 25916, 220839, 163243, 159533, 8037
006Fabra Obs. in Spain, 1 in MPEC 2018-L12 -- 66391
G26Fushan Obs. in China, 1 in MPEC 2018-L12 -- 1627
J77Golden Hill Obs. in England, 1 in MPEC 2018-L10 -- 2018 LJ
238Grorudalen Obs. in Norway, 1 in MPEC 2018-L12 -- 66391
A17Guidestar Obs. in Germany, 3 in MPECs 2018-L10 & 2018-L12 -- 2018 LJ, 2018 JC3, 162168
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-L12 -- 2012 DG61
246KLENOT in the Czech Republic, 5 in MPECs 2018-L10 & 2018-L12 -- 2018 LJ, 2018 JE5, 2018 JE1, 2018 JC3, 2018 EJ4
K93LCO Sutherland C in South Africa, 1 in MPEC 2018-L12 -- 2018 LC
K38M57 Obs. in Italy, 1 in MPEC 2018-L10 -- 2018 LJ
108Montelupo Obs. in Italy, 3 in MPEC 2018-L12 -- 66391, 25916, 1036
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2018-L11 & 2018-L12 -- 2018 LG, 2015 DP155, 54660, 53789, 9856
J69North Obs. in England, 1 in MPEC 2018-L10 -- 2018 LJ
Z80Northolt Branch Obs. in England, 2 in MPEC 2018-L12 -- 2018 EJ4, 139345
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2018-L12 -- 2018 EJ4
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPECs 2018-L09, 2018-L11 & 2018-L12 -- 2018 LH, 2018 LG, 2018 KP, 2018 CK14, 2017 WH14, 2012 KY41, 54686, 468910, 350713, 183548, 159533, 152770, 100004, 2059
F52Pan-STARRS 2 (PS2) in Hawaii, 3 in MPEC 2018-L12 -- 2018 KM1, 2018 JY1, 85628
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-L10 -- 2018 LJ
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-L10 -- 2018 LJ
691Spacewatch 0.9m telescope in Arizona, 3 in MPECs 2018-L10, 2018-L11 & 2018-L12 -- 2018 LJ, 2018 LG, 85804
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2018-L09 & 2018-L12 -- 2018 LH, 2018 LC, 2017 YZ1, 2017 UR4
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2018-L10 & 2018-L12 -- 2018 LJ, 220839
I52Steward Obs. Mt. Lemmon Station in Arizona, 6 in MPECs 2018-L09, 2018-L10, 2018-L11 & 2018-L12 -- 2018 LJ, 2018 LH, 2018 LG, 2018 KH, 2018 KF3, 2018 JD5
A98Taurus-1 Obs. in Belarus, 1 in MPEC 2018-L12 -- 2015 DP155
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-L12 -- 2018 JM, 2018 GJ1
L01Visnjan Obs., 3 in MPECs 2018-L09, 2018-L10 & 2018-L11 -- 2018 LJ, 2018 LH, 2018 LG
198Wildberg Obs. in Germany, 1 in MPEC 2018-L10 -- 2018 LJ
C51WISE in Earth polar orbit, 2 in MPEC 2018-L12 -- 518463, 163691
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 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 LBNEODyS15552075-2118175.65e-06-6.04-6.5-NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2018-06-01.169 to 2018-06-02.148."
2018 LANEODyS1555201811.0e+002.112.110NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2018-06-02.344 to 2018-06-02.502."
2014 LY21JPL Sentry18042019-21169768.85019570999999e-05-5.16-5.660JPL: Computed at 18:09 April 8th of 2017 Pacific time based on 11 observations spanning .04506 days (2014-Jun-02.41612 to 2014-Jun-02.46118). Diameter approximately 0.005 km. from weighted mean H=29.22.

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 5 June '18

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

2136Generated Traffic Report
1804Noted that JPL Sentry has updated its 2014 LY21 risk assessment - see above
1555Noted that NEODyS has updated its 2018 LA risk assessment - see above
Noted that NEODyS has posted 2018 LB as an impact risk - see above
Grabbed MPEC 2018-L09 - 2018 LH - see above
Grabbed MPEC 2018-L10 - 2018 LJ - see above
Grabbed MPEC 2018-L11 - 2018 LG - see above
Grabbed MPEC 2018-L12 - Daily Orbit Update - see above