Contents  on 4 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 4 June '18

Two objects reported inside ten LD

Two transient natural objects are reported within ten lunar distances (LD) of our home world today. Newly announced risk-listed 2018 LB is the closest, moving out from 5.30 to 6.83 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  5.30 to 6.83 LD May 26 - June 6 NEW, NHATS target, risk - MPEC
5.56 LD June 10 2018 EJ4 186 m  9.80 from 10.97 LD today - June 16 radar/NHATS target, enters ten LD - DOU
Approaching
8.96 LD June 11 2015 DP155 162 m  10.88 from 11.46 LD June 6 - 15 NHATS target - DOU

This report was generated at 1825 UTC with the discovery of outbound risk-listed 2018 LB (MPEC) and with follow-up in today's DOU MPEC for inbound 2018 EJ4 and approaching 2015 DP155 as well as distant 2015 b;BL311.


<< Reading:  The American Meteor Society has a news item about 2018 LA's atmospheric impact over southern Africa. See also the International Meteor Organization's event page and our links page.



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. "Distant" is used here to describe an object that has approached Earth within ten LD since A/CC began these traffic reports eleven years ago but is not currently coming so close. 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 4 June '18

The MPC's NEO Confirmation Page has 24 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 24 objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 27 listings on the NEOCP today.

New MPECs  on 4 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.


MPEC 2018-L08 - "19:00 UT" - 2016 CC194


<< DOU on 4 June '18 >>  MPEC 2018-L07 - "12:02 UT" - Daily Orbit Update


MPEC 2018-L06 - "01:32 UT" - 2018 LC


MPEC 2018-L05 - "01:29 UT" - 2018 LB

Observers  on 4 June '18

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2018-L05 & 2018-L07 -- 2018 LB, 518507
T05ATLAS Haleakala in Hawaii, 7 in MPEC 2018-L07 -- 2015 DP155, 278327, 138847, 9856, 3752, 1866, 1580
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2018-L07 -- 467309, 408752, 25916, 220839
U63Burnt Tree Hill Obs., 1 in MPEC 2018-L07 -- 2018 EJ4
703Catalina Sky Survey (CSS) in Arizona, 12 in MPEC 2018-L07 -- 2018 EJ4, 2001 SC170, 514652, 450648, 399611, 397237, 37655, 24761, 164201, 15745, 152964, 152931
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2018-L07 -- 2018 JE, 2018 CE2
B92Chinon Obs. in France, 1 in MPEC 2018-L07 -- 66391
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-L05 -- 2018 LB
K73Gravina Obs. in Italy, 3 in MPEC 2018-L07 -- 66391, 25916, 1627
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 3 in MPECs 2018-L05 & 2018-L07 -- 2018 LB, 139345, 138847
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2018-L07 -- 518737
Z21LCO Tenerife Aqawan A#1 in the Canary Islands, 1 in MPEC 2018-L07 -- 2015 DP155
D35Lulin Minor Bodies Tracking in Taiwan, 1 in MPEC 2018-L05 -- 2018 LB
900Moriyama Obs. in Japan, 1 in MPEC 2018-L05 -- 2018 LB
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2018-L06 & 2018-L07 -- 2018 LC, 53110, 259802, 164217, 162483, 115052
J69North Obs. in England, 1 in MPEC 2018-L07 -- 66391
I41Palomar Transient Factory (PTF) in southern California, 5 in MPECs 2018-L05 & 2018-L07 -- 2018 LB, 86666, 474574, 15745, 138847
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPEC 2018-L07 -- 2018 GA5, 2016 CX264, 2015 TQ178, 2015 BL311, 2011 MV1, 507847, 277570, 141531, 1685
F52Pan-STARRS 2 (PS2) in Hawaii, 2 in MPEC 2018-L07 -- 514652, 138847
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-L06 -- 2018 LC
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2018-L07 -- 2018 LC, 2018 KM1, 2018 KL2, 2018 KL, 2018 JV2, 2018 JQ1, 458122
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2018-L07 -- 2016 JJ24, 2015 DZ197
I52Steward Obs. Mt. Lemmon Station in Arizona, 22 in MPECs 2018-L06 & 2018-L07 -- 2018 LC, 2018 KS2, 2018 KQ1, 2018 KM1, 2018 KL2, 2018 KL, 2018 KH1, 2018 KH, 2018 KG1, 2018 KF3, 2018 KD3, 2018 KD1, 2018 KC3, 2018 JV2, 2018 JL, 2018 JE5, 2018 JE1, 2018 JD2, 2018 GZ4, 2018 FS1, 2018 EM2, 2018 BY2
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-L08 -- 2016 CC194
L01Visnjan Obs., 2 in MPECs 2018-L05 & 2018-L06 -- 2018 LC, 2018 LB
C51WISE in Earth polar orbit, 2 in MPEC 2018-L07 -- 518463, 163691
E08Wobblesock Obs. in New South Wales, 2 in MPEC 2018-L07 -- 2018 JA, 2018 ER4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 LBJPL Sentry03072092-2116113.61698e-06-6.29-6.810JPL: Computed at 19:49 June 3rd Pacific time based on 33 observations spanning .97953 days (2018-Jun-01.16813 to 2018-Jun-02.147665). Diameter approximately 0.022 km. from weighted mean H=25.99.
2018 LANEODyS1510201811.0e+002.132.130NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2018-06-02.344 to 2018-06-02.502."
2014 LY21JPL Sentry03072018-21169778.85048880999998e-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 4 June '18

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

1930Grabbed MPEC 2018-L08 - 2016 CC194 - see above
1825Generated Traffic Report
1510Noted that NEODyS has posted 2018 LA as an impact risk - see above
Grabbed MPEC 2018-L07 - Daily Orbit Update - see above
0307Noted that JPL Sentry has updated its 2014 LY21 risk assessment - see above
Noted that JPL Sentry has posted 2018 LB as an impact risk - see above
Grabbed MPEC 2018-L05 - 2018 LB - see above
Grabbed MPEC 2018-L06 - 2018 LC - see above