Contents  on 14 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 14 June '18

Seven objects reported inside ten LD

Seven asteroidal objects are reported within ten lunar distances (LD) of our planet today. Intruder 2018 LV3, which is the nearest, enters the Earth-Moon system, coming in from 2.88 to 0.90 LD. Also inside Earth's sphere of gravitational influence, risk-listed 2018 LD1 comes its closest to our planet this time around, reaching 1.56 LD at 1558 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
0.86 LD tomorrow 2018 LV3 17 m  0.90 from 2.88 LD June 11 - 19 intruder today, enters Earth SOI - DOU
1.56 LD today 2018 LD1 18 m  1.56 LD June 10 - 18 Earth closest at 1558 UTC, Moon closest 1.99 LD at 2135 UTC,
risk - DOU
3.64 LD June 11 2018 LW3 21 m  6.19 to 8.00 LD June 7 - 16 DOU
3.93 LD June 9 2018 LR2 24 m  9.69 to 11.74 LD June 5 - 14 exits ten LD, risk - DOU
5.56 LD June 10 2018 EJ4 186 m  7.11 to 8.05 LD June 4 - 16 radar/NHATS target
7.62 LD tomorrow 2018 LK 154 m  7.99 from 9.21 LD yesterday - June 18 DOU
8.96 LD June 11 2015 DP155 162 m  9.38 to 9.72 LD June 6 - 15 NHATS target - DOU
Approaching
6.0   LD June 29* 2018 LR3 18 m  13.7 from 14.4 LD June 20 - July 8 Earth passage uncertainty +/- 6 mins.*, NHATS target, risk - DOU

This report was generated at 1922 UTC with follow-up in today's DOU MPEC for seven objects in the active traffic table here, and for four departed objects: 68347 2001 KB67, 1999 FN19, and risk-listed 2018 LM and 2018 JG1, plus astrometry from March for 450894 2008 BT18.


<< Reading:  NEODyS announced to the Minor Planet Mailing List today that it has put up a beta version of its new NEOScan service. It posts impact probabilities for newly discovered near-Earth objects on the NEO Confirmation Page (NEOCP) and complements, and is best used in junction with, NASA/JPL's comparable Scout service for alerting observers to impact risks. Speaking of impactors, a preprint was posted today about the orbital evolution of 2018 LA (links), suggesting a relationship with other known asteroids and bolides.



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 14 June '18

The MPC's NEO Confirmation Page has 67 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 67 objects listed. Of these, 39 were "one nighters." So far The Tracking News has counted a total of 77 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 14 June '18

Minor Planet Electronic Circulars

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


MPEC 2018-L76 - "16:49 UT" - Comet P/2005 R1 = 2018 L3 (NEAT)


MPEC 2018-L75 - "14:37 UT" - 2018 LM4


MPEC 2018-L74 - "14:25 UT" - 2018 LN4


<< DOU on 14 June '18 >>  MPEC 2018-L73 - "12:03 UT" - Daily Orbit Update


MPEC 2018-L72 - "11:27 UT" - 2015 BP515

Observers  on 14 June '18

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

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-L74 -- 2018 LN4
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2018-L73 -- 2016 EE158, 2015 XP55, 2015 JP, 2014 UV, 2005 EZ29
T05ATLAS Haleakala in Hawaii, 23 in MPECs 2018-L73 & 2018-L74 -- 2018 LW3, 2018 LN4, 2018 JE1, 2015 DP155, 2004 LH, 96189, 85490, 68950, 68350, 68348, 504711, 495615, 455550, 408752, 36183, 242643, 15745, 141484, 139359, 139345, 13553, 5604, 1036
T08ATLAS Mauna Loa in Hawaii, 8 in MPECs 2018-L73 & 2018-L74 -- 2018 LW3, 2018 LN4, 278327, 138847, 9856, 3752, 1866, 1580
703Catalina Sky Survey (CSS) in Arizona, 24 in MPEC 2018-L73 -- 2018 LG1, 2018 LC3, 68347, 68346, 516976, 504711, 450894, 450648, 434344, 415029, 397237, 350988, 265196, 24761, 194126, 185853, 16834, 15745, 153957, 140039, 11066, 1981, 1865, 1864
G37Discovery Channel Telescope (DCT) in Arizona, 3 in MPEC 2018-L73 -- 2018 LV2, 2018 LQ2, 2018 LC1
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 8 in MPECs 2018-L72, 2018-L73, 2018-L75 & 2018-L76 -- 2018 LV3, 2018 LT3, 2018 LS3, 2018 LM4, P/2018 L3, 2017 YH5, 2015 BP515, 302591
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2018-L73 -- 2018 LB1
V37LCO McDonald Obs. in Texas, 1 in MPEC 2018-L73 -- 2018 LB1
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-L73 -- 9856
900Moriyama Obs. in Japan, 1 in MPEC 2018-L74 -- 2018 LN4
474Mt. John Obs. in New Zealand, 1 in MPEC 2018-L74 -- 2018 LN4
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2018-L73 & 2018-L75 -- 2018 LM4, 2018 LK, 2015 BG311, 2015 AX16, 1999 LK1, 1999 FN19, 719
J69North Obs. in England, 1 in MPEC 2018-L73 -- 2018 LQ3
Z80Northolt Branch Obs. in England, 2 in MPEC 2018-L73 -- 2015 DP155, 153957
I41Palomar Transient Factory (PTF) in southern California, 4 in MPEC 2018-L73 -- 86067, 66391, 516420, 474574
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPEC 2018-L73 -- 2015 AM45, 2012 MR4, 2005 YW93, 1999 RV2, 518426, 395143, 338172
F52Pan-STARRS 2 (PS2) in Hawaii, 7 in MPEC 2018-L73 -- 2018 LQ2, 2018 LF1, 2018 JC3, 86067, 68347, 162854, 15745
D29Purple Mtn. Obs. Xuyi Station in China, 14 in MPEC 2018-L73 -- 2018 KV, 2017 WH14, 2015 FP118, 68347, 495829, 337228, 277570, 243298, 18882, 186822, 185853, 162854, 139359, 5626
Y00SONEAR in Brazil, 2 in MPECs 2018-L73 & 2018-L74 -- 2018 LN4, 2015 DP155
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2018-L73 -- 2018 LQ2, 2012 LF11
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2018-L73 -- 2018 LR3, 2018 LM2, 2018 LB1
I52Steward Obs. Mt. Lemmon Station in Arizona, 15 in MPECs 2018-L73 & 2018-L75 -- 2018 LV3, 2018 LU3, 2018 LT3, 2018 LS3, 2018 LR3, 2018 LQ3, 2018 LP2, 2018 LN, 2018 LM4, 2018 LL2, 2018 LK, 2018 LG1, 2018 LG, 2018 LF1, 2018 LE3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 7 in MPEC 2018-L73 -- 2018 LR3, 2018 LR2, 2018 LM, 2018 LD1, 2018 LB1, 2018 JG1, 2015 TK
L01Visnjan Obs., 1 in MPEC 2018-L75 -- 2018 LM4
C51WISE in Earth polar orbit, 3 in MPEC 2018-L73 -- 2014 FD7, 66391, 463664
E08Wobblesock Obs. in New South Wales, 1 in MPEC 2018-L74 -- 2018 LN4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 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 LM4JPL Sentry16332028-2118383.253695e-07-3.13-3.950JPL: Computed at 09:08 today Pacific time based on 19 observations spanning 3.0085 days (2018-Jun-11.44999 to 2018-Jun-14.4585). Diameter approximately 0.700 km. from weighted mean H=18.42.
2018 LR3JPL Sentry15512076-211387.88573e-06-6.04-6.110JPL: Computed at 07:42 today Pacific time based on 26 observations spanning 3.9362 days (2018-Jun-10.32538 to 2018-Jun-14.26157). Diameter approximately 0.019 km. from weighted mean H=26.31.
2018 LB1JPL Sentry1551R E M O V E DJPL: Risk listing removed at 1414 UTC today
2018 LMJPL Sentry15512112-211629.632e-07-6.59-6.700JPL: Computed at 07:30 today Pacific time based on 76 observations spanning 8.9893 days (2018-Jun-04.25437 to 2018-Jun-13.243662). Diameter approximately 0.031 km. from weighted mean H=25.17.
2018 JG1JPL Sentry1551R E M O V E DJPL: Risk listing removed at 1416 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 14 June '18

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

1922Generated Traffic Report
1708Grabbed MPEC 2018-L76 - Comet P/2005 R1 = 2018 L3 (NEAT) - see above
1633Noted that JPL Sentry has posted 2018 LM4 as an impact risk - see above
1551Noted that JPL Sentry has removed 2018 JG1 as an impact risk - see above
Noted that JPL Sentry has removed 2018 LB1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 LM risk assessment - see above
Noted that JPL Sentry has updated its 2018 LR3 risk assessment - see above
Grabbed MPEC 2018-L72 - 2015 BP515 - see above
Grabbed MPEC 2018-L73 - Daily Orbit Update - see above
Grabbed MPEC 2018-L74 - 2018 LN4 - see above
Grabbed MPEC 2018-L75 - 2018 LM4 - see above