Contents  on 20 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 20 June '18

Five objects reported inside ten LD

There are five transient natural objects reported within ten lunar distances (LD) of our planet today. Nearest is 2018 LX5, which moves in from 6.97 to 5.58 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
0.54 LD June 16 2018 MZ4 6 m  6.96 to 9.11 LD June 12 - 21 NEW, intruder, NHATS target - MPEC
5.22 LD tomorrow 2018 LX5 31 m  5.58 from 6.97 LD June 18 - 24 DOU
6.02 LD June 29 2018 LR3 19 m  9.50 from 10.15 LD today - July 8 NHATS target, enters ten LD, risk - DOU
6.50 LD tomorrow 2018 LS5 15 m  6.74 from 7.53 LD June 18 - 25
7.49 LD today 2018 MK 51 m  7.49 LD June 18 - 22 Earth closest at 1102 UTC
Approaching
5.51 LD June 27 2018 MX4 15 m  13.33 from 14.99 LD June 23 - July 2 NEW - MPEC

This report was generated at 2343 UTC with the discovery of approaching 2018 MX4 (MPEC) announced late yesterday and today's announcement of outbound intruder 2018 MZ4 (MPEC). The DOU MPEC today has follow-up for inbound objects 2018 LX5 and risk-listed 2018 LR3, and for departed objects 2018 MJ and risk-listed 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 20 June '18

The MPC's NEO Confirmation Page has 41 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 41 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 50 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 20 June '18

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been ten MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-M67 - "15:17 UT" - 2018 MQ5


MPEC 2018-M66 - "15:13 UT" - 2018 MR5


MPEC 2018-M65 - "15:09 UT" - 2018 MP5


MPEC 2018-M64 - "15:05 UT" - 2018 MO5


<< DOU on 20 June '18 >>  MPEC 2018-M63 - "12:04 UT" - Daily Orbit Update


MPEC 2018-M62 - "10:36 UT" - 2007 LT


MPEC 2018-M61 - "00:31 UT" - 2018 MZ4


MPEC 2018-M60 - "00:13 UT" - 2018 MK5


MPEC 2018-M59 - "00:10 UT" - 2018 MJ5


MPEC 2018-M58 - "00:06 UT" - 2018 MH5

Observers  on 20 June '18

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2018-M62 & 2018-M67 -- 2018 MQ5, 2007 LT
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2018-M63 -- 278327, 1580
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2018-M63 -- 1627, 1036
X74Campo dos Amarais Obs., 1 in MPEC 2018-M63 -- 420591
160Castelmartini Obs. in Italy, 10 in MPEC 2018-M63 -- 68950, 455550, 415029, 16834, 162168, 153957, 139345, 13553, 7889, 719
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2018-M63 -- 2018 LF5, 2014 US192, 2001 SC170, 53110, 467309, 37336, 138847, 3752
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPECs 2018-M58, 2018-M59, 2018-M60, 2018-M63, 2018-M64 & 2018-M65 -- 2018 MP5, 2018 MO5, 2018 MK5, 2018 MJ5, 2018 MH5, 2018 LK2, 2018 JG1
G96Mt. Lemmon Survey (MLS) in Arizona, 19 in MPECs 2018-M62, 2018-M63 & 2018-M67 -- 2018 MQ5, 2018 LO5, 2018 LG, 2018 KG1, 2017 QP17, 2015 TQ178, 2007 LT, 99799, 87025, 85628, 520585, 509821, 25916, 18109, 164400, 139359, 7350, 6569, 5626
I41Palomar Transient Factory (PTF) in southern California, 2 in MPECs 2018-M61 & 2018-M63 -- 2018 MZ4, 2018 LF5
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPECs 2018-M58, 2018-M59, 2018-M60, 2018-M62, 2018-M63, 2018-M64, 2018-M65 & 2018-M66 -- 2018 MR5, 2018 MP5, 2018 MO5, 2018 MK5, 2018 MJ5, 2018 MH5, 2007 LT, 2002 OS4, 1999 RV2, 18882, 5011
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2018-M63 -- 444193
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-M58 -- 2018 MH5
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-M61 -- 2018 MZ4
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-M63 -- 2018 LU3
691Spacewatch 0.9m telescope in Arizona, 15 in MPEC 2018-M63 -- 2018 LX5, 2018 LU3, 2018 LS2, 2018 LQ2, 2018 LO5, 2018 LN5, 2018 LC3, 2018 LC1, 2018 KG1, 2018 KB1, 2018 JQ1, 2018 JD5, 2018 GL1, 2017 QP17, 2015 MQ101
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2018-M63 -- 2018 LV2, 2018 LL2, 2018 LG, 2018 LC, 2018 LB1, 2015 FR117, 2013 LH16
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-M63 -- 518640
I52Steward Obs. Mt. Lemmon Station in Arizona, 27 in MPECs 2018-M58, 2018-M59, 2018-M62, 2018-M63, 2018-M64, 2018-M65, 2018-M66 & 2018-M67 -- 2018 MR5, 2018 MQ5, 2018 MP5, 2018 MO5, 2018 MJ5, 2018 MJ, 2018 MH5, 2018 MA, 2018 LZ5, 2018 LX5, 2018 LW5, 2018 LS6, 2018 LR5, 2018 LR3, 2018 LQ5, 2018 LP5, 2018 LO5, 2018 LN4, 2018 LM4, 2018 LL2, 2018 LH5, 2018 KF3, 2018 KB1, 2018 JE5, 2018 JD5, 2007 LT, 27346
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-M63 -- 2015 KH157
L01Visnjan Obs., 5 in MPECs 2018-M58, 2018-M59, 2018-M62, 2018-M63 & 2018-M67 -- 2018 MQ5, 2018 MJ5, 2018 MH5, 2018 JV2, 2007 LT
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2018-M63 -- 2018 LX5, 66391, 467309
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 June '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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 MR5JPL Sentry16332057-205711.231e-10-7.29-7.290JPL: Computed at 09:31 today Pacific time based on 10 observations spanning 4.8205 days (2018-Jun-15.586258 to 2018-Jun-20.40677). Diameter approximately 0.270 km. from weighted mean H=20.49.
2018 MC5JPL Sentry01422057-2113156.1088972e-06-5.61-6.110JPL: Computed at 18:04 June 19th Pacific time based on 21 observations spanning 7.0773 days (2018-Jun-12.475331 to 2018-Jun-19.55259). Diameter approximately 0.032 km. from weighted mean H=25.14.
2018 LR3JPL Sentry14382077-211771.059345e-05-5.88-5.970JPL: Computed at 07:17 today Pacific time based on 41 observations spanning 9.8887 days (2018-Jun-10.32538 to 2018-Jun-20.21405). Diameter approximately 0.019 km. from weighted mean H=26.25.
2018 LK2JPL Sentry1438R E M O V E DJPL: Risk listing removed at 1406 UTC today

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 20 June '18

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

2343Generated Traffic Report
1633Noted that JPL Sentry has posted 2018 MR5 as an impact risk - see above
Grabbed MPEC 2018-M64 - 2018 MO5 - see above
Grabbed MPEC 2018-M65 - 2018 MP5 - see above
Grabbed MPEC 2018-M66 - 2018 MR5 - see above
Grabbed MPEC 2018-M67 - 2018 MQ5 - see above
1438Noted that JPL Sentry has removed 2018 LK2 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 LR3 risk assessment - see above
1402Grabbed MPEC 2018-M62 - 2007 LT - see above
Grabbed MPEC 2018-M63 - Daily Orbit Update - see above
0142Noted that JPL Sentry has posted 2018 MC5 as an impact risk - see above
0042Grabbed MPEC 2018-M58 - 2018 MH5 - see above
Grabbed MPEC 2018-M59 - 2018 MJ5 - see above
Grabbed MPEC 2018-M60 - 2018 MK5 - see above
Grabbed MPEC 2018-M61 - 2018 MZ4 - see above