Contents  on 21 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 21 June '18

Five objects reported inside ten LD

Five visitors are known to be less than ten lunar distances (LD) of our home world today. Nearest is 2018 LX5, which comes its closest to Earth on this passage -- 5.22 LD at 1801 UTC.

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  9.11 to 11.27 LD June 12 - 21 intruder, NHATS target, exits ten LD
5.22 LD today 2018 LX5 30 m  5.22 LD June 18 - 24 Earth closest at 1801 UTC - DOU
6.02 LD June 29 2018 LR3 19 m  8.87 from 9.50 LD yesterday - July 8 NHATS target, risk
6.50 LD today 2018 LS5 16 m  6.50 LD June 18 - 25 Earth closest at 2048 UTC, risk - DOU
7.49 LD yesterday 2018 MK 51 m  7.77 to 9.55 LD June 18 - 22
Approaching
5.51 LD June 27 2018 MX4 15 m  11.72 from 13.33 LD June 23 - July 2 risk - DOU

This report was generated at 1753 UTC with follow-up in today's DOU MPEC for three objects active in the above traffic table and for four departed objects: 2018 MJ, 2015 DP155, 68347 2001 KB67, and 1999 FN19.


<< Reading:  NASA/JPL announced yesterday a new multi-agency ten-year "National Near-Earth Object Preparedness Strategy and Action Plan" (PDF).



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 21 June '18

The MPC's NEO Confirmation Page has 41 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 41 objects listed. Of these, 28 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 21 June '18

Minor Planet Electronic Circulars

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


MPEC 2018-M76 - "23:34 UT" - 2018 MV6


<< DOU on 21 June '18 >>  MPEC 2018-M75 - "12:04 UT" - Daily Orbit Update


MPEC 2018-M74 - "11:53 UT" - 2018 MU6


MPEC 2018-M73 - "11:50 UT" - 2018 MT6


MPEC 2018-M72 - "11:46 UT" - 2018 MS6


MPEC 2018-M71 - "11:43 UT" - 2018 MR6


MPEC 2018-M70 - "11:40 UT" - 2018 MQ6


MPEC 2018-M69 - "11:37 UT" - 2018 LB16


MPEC 2018-M68 - "11:34 UT" - 2018 LA16

Observers  on 21 June '18

A total of 29 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2018-M70 -- 2018 MQ6
T08ATLAS Mauna Loa in Hawaii, 7 in MPEC 2018-M75 -- 68347, 66391, 455550, 450648, 15745, 1866, 1627
K46Bamberg Obs. in Germany, 1 in MPEC 2018-M75 -- 1627
160Castelmartini Obs. in Italy, 1 in MPEC 2018-M75 -- 2015 XK1
703Catalina Sky Survey (CSS) in Arizona, 13 in MPEC 2018-M75 -- 2018 LC3, 87309, 85989, 68347, 54401, 450648, 424482, 414903, 17181, 16834, 140039, 11500, 4596
309+program code "+" (20) via Cerro Paranal in Chile, 1 in MPEC 2018-M75 -- 2014 UX34
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPECs 2018-M68, 2018-M70, 2018-M71, 2018-M72, 2018-M73, 2018-M75 & 2018-M76 -- 2018 MV6, 2018 MT6, 2018 MS6, 2018 MR6, 2018 MQ6, 2018 LA16, 2018 KK2, 2018 JE, 2018 ER4
151Eschenberg Obs. in Switzerland, 1 in MPEC 2018-M75 -- 2018 LD3
A17Guidestar Obs. in Germany, 5 in MPEC 2018-M75 -- 2018 LW5, 2018 LD3, 2017 YE5, 2017 DO36, 2005 MF5
246KLENOT in the Czech Republic, 4 in MPECs 2018-M73 & 2018-M75 -- 2018 MT6, 2018 LX5, 2018 LD3, 2018 JC3
V37LCO McDonald Obs. in Texas, 1 in MPEC 2018-M75 -- 2017 YE5
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2018-M68, 2018-M70 & 2018-M71 -- 2018 MR6, 2018 MQ6, 2018 LA16
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2018-M69 -- 2018 LB16
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2018-M73, 2018-M74 & 2018-M75 -- 2018 MU6, 2018 MT6, 2018 LN2, 2018 LF5, 2018 JS1, 2001 SC170, 53789, 164217
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-M75 -- 68347, 153957, 139345
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2018-M68, 2018-M69, 2018-M70, 2018-M71, 2018-M72 & 2018-M76 -- 2018 MV6, 2018 MS6, 2018 MR6, 2018 MQ6, 2018 LB16, 2018 LA16
F52Pan-STARRS 2 (PS2) in Hawaii, 2 in MPECs 2018-M71 & 2018-M74 -- 2018 MU6, 2018 MR6
D29Purple Mtn. Obs. Xuyi Station in China, 13 in MPEC 2018-M75 -- 2015 XK1, 1999 FN19, 68347, 67367, 450648, 25916, 189973, 18109, 162168, 159533, 139345, 13553, 7889
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-M75 -- 2018 EB
H36Sandlot Obs. in Kansas, 2 in MPEC 2018-M75 -- 2018 KT, 2015 MQ101
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-M75 -- 2018 LC3
Y00SONEAR in Brazil, 2 in MPEC 2018-M75 -- 66400, 25916
691Spacewatch 0.9m telescope in Arizona, 13 in MPECs 2018-M69, 2018-M74 & 2018-M75 -- 2018 MU6, 2018 MS6, 2018 MR5, 2018 LU3, 2018 LS2, 2018 LQ2, 2018 LP5, 2018 LO5, 2018 LB16, 2018 JV2, 2018 JQ1, 2017 QP17, 2007 NL1
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2018-M68, 2018-M70, 2018-M71, 2018-M72 & 2018-M75 -- 2018 MV4, 2018 MS6, 2018 MR6, 2018 MQ6, 2018 LV2, 2018 LU5, 2018 LM2, 2018 LL2, 2018 LA16, 2014 US192, 2014 GE53
I52Steward Obs. Mt. Lemmon Station in Arizona, 37 in MPECs 2018-M69, 2018-M72, 2018-M73, 2018-M74 & 2018-M75 -- 2018 MX4, 2018 MU6, 2018 MT6, 2018 MS6, 2018 MJ5, 2018 MJ, 2018 MH5, 2018 MG5, 2018 MF5, 2018 MC5, 2018 LX5, 2018 LU5, 2018 LS5, 2018 LR6, 2018 LQ6, 2018 LQ3, 2018 LQ2, 2018 LP5, 2018 LO5, 2018 LN4, 2018 LN2, 2018 LN, 2018 LL2, 2018 LG5, 2018 LG1, 2018 LF5, 2018 LE4, 2018 LE3, 2018 LD3, 2018 LC1, 2018 LB16, 2018 KV, 2018 JV2, 2018 JS1, 2018 JE1, 2015 DP, 2012 TM139
B18Terskol Obs. in Russia, 1 in MPEC 2018-M75 -- 2015 DP155
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-M75 -- 2010 JF87
L01Visnjan Obs., 3 in MPECs 2018-M72, 2018-M73 & 2018-M74 -- 2018 MU6, 2018 MT6, 2018 MS6
C51WISE in Earth polar orbit, 3 in MPEC 2018-M75 -- 444193, 397237, 194126
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 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 MR5JPL Sentry1500R E M O V E DJPL: Risk listing removed at 1438 UTC today
NEODyS15002057-211821.18e-10-7.50-7.75n/aNEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2018-06-15.587 to 2018-06-20.408."
2018 MC5JPL Sentry15002057-2113116.610823e-06-5.62-6.230JPL: Computed at 07:33 today Pacific time based on 24 observations spanning 8.8719 days (2018-Jun-12.475331 to 2018-Jun-21.34723). Diameter approximately 0.032 km. from weighted mean H=25.15.
NEODyS15002045-2116241.88e-05-5.18-5.660NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2018-06-12.476 to 2018-06-19.553."
2018 MX4NEODyS15002103-211722.07e-09-9.95-10.120NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2018-06-17.314 to 2018-06-19.317."
2018 LZ13NEODyS15002057-209261.77e-07-4.06-4.290NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2018-06-15.526 to 2018-06-19.397."
2018 LT5NEODyS15002025-208363.83e-08-6.98-7.460NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2018-06-14.396 to 2018-06-19.044."
2018 LS5JPL Sentry15002048-204814.003e-09-9.08-9.080JPL: Computed at 07:46 today Pacific time based on 17 observations spanning 6.9429 days (2018-Jun-14.35502 to 2018-Jun-21.29788). Diameter approximately 0.016 km. from weighted mean H=26.66.
2018 LR3NEODyS15002077-2118132.1e-06-6.66-6.81n/aNEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2018-06-10.326 to 2018-06-20.215."
2018 LMNEODyS1500211611.31e-07-7.49-7.490NEODyS: "Based on 88 optical observations (of which 0 are rejected as outliers) from 2018-06-04.255 to 2018-06-19.023."
2018 JG1NEODyS1500211827.36e-09-8.29-8.33n/aNEODyS: "Based on 83 optical observations (of which 0 are rejected as outliers) from 2018-05-08.180 to 2018-06-19.334."
2014 UX34JPL Sentry15002084-208411.216e-08-6.37-6.370JPL: Computed at 07:06 today Pacific time based on 59 observations spanning 36.925 days (2014-Oct-23.33075 to 2014-Nov-29.25596). Diameter approximately 0.120 km. from weighted mean H=22.33.

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 21 June '18

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

2358Grabbed MPEC 2018-M76 - 2018 MV6 - see above
1753Generated Traffic Report
1500Noted that JPL Sentry has updated its 2014 UX34 risk assessment - see above
Noted that NEODyS has updated its 2018 JG1 risk assessment - see above
Noted that NEODyS has updated its 2018 LM risk assessment - see above
Noted that NEODyS has updated its 2018 LR3 risk assessment - see above
Noted that JPL Sentry has posted 2018 LS5 as an impact risk - see above
Noted that NEODyS has updated its 2018 LT5 risk assessment - see above
Noted that NEODyS has updated its 2018 LZ13 risk assessment - see above
Noted that JPL Sentry has updated its 2018 MC5 risk assessment - see above
Noted that NEODyS has posted 2018 MC5 as an impact risk - see above
Noted that JPL Sentry has removed 2018 MR5 as an impact risk - see above
Noted that NEODyS has posted 2018 MR5 as an impact risk - see above
Noted that NEODyS has posted 2018 MX4 as an impact risk - see above
Grabbed MPEC 2018-M68 - 2018 LA16 - see above
Grabbed MPEC 2018-M69 - 2018 LB16 - see above
Grabbed MPEC 2018-M70 - 2018 MQ6 - see above
Grabbed MPEC 2018-M71 - 2018 MR6 - see above
Grabbed MPEC 2018-M72 - 2018 MS6 - see above
Grabbed MPEC 2018-M73 - 2018 MT6 - see above
Grabbed MPEC 2018-M74 - 2018 MU6 - see above
Grabbed MPEC 2018-M75 - Daily Orbit Update - see above