Contents  on 6 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 6 June '18

Four objects reported inside ten LD

There are four planetesimals known to be within ten lunar distances (LD) of our planet today. Nearest is 2018 EJ4, which is inbound from 8.69 to 7.67 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  8.41 to 10.01 LD May 26 - today NHATS target, exits ten LD, risk
5.06 LD May 29 2018 LM 34 m  9.55 to 10.54 LD May 22 - today NEW, exits ten LD, risk - MPEC
5.56 LD June 10 2018 EJ4 186 m  7.67 from 8.69 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  9.90 from 10.35 LD today - June 15 NHATS target, enters ten LD - DOU
Approaching
7.62 LD June 15 2018 LK 147 m  25.90 from 28.60 LD June 13 - 18 NEW - MPEC

This report was generated at 1851 UTC with the discoveries of three close-passers: approaching 2018 LK (MPEC) and outbound risk-listed 2018 LM (MPEC) -- see the above table for details, and departed 2018 LL (MPEC), which flew past us at 3.93 LD on May 31st. Today's DOU MPEC has follow-up for inbound 2018 EJ4 and 2015 DP155.



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. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 6 June '18

The MPC's NEO Confirmation Page has 32 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 32 objects listed. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 44 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 6 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.


<< DOU on 6 June '18 >>  MPEC 2018-L17 - "12:02 UT" - Daily Orbit Update


MPEC 2018-L16 - "10:33 UT" - 2018 LN


MPEC 2018-L15 - "10:26 UT" - 2018 LM


MPEC 2018-L14 - "10:23 UT" - 2018 LL


MPEC 2018-L13 - "01:29 UT" - 2018 LK

Observers  on 6 June '18

A total of 32 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPEC 2018-L17 -- 2018 KD3, 2017 SB14, 2016 JJ24, 2015 JP
T05ATLAS Haleakala in Hawaii, 16 in MPEC 2018-L17 -- 2004 LH, 96189, 68348, 67367, 65674, 475967, 408752, 242708, 242643, 17274, 141484, 13553, 5604, 1685, 1627, 887
T08ATLAS Mauna Loa in Hawaii, 8 in MPECs 2018-L13 & 2018-L17 -- 2018 LK, 2018 LJ, 85989, 278327, 138847, 9856, 3752, 1866
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2018-L15 & 2018-L17 -- 2018 LN, 2018 LM, 467309, 25916
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2018-L17 -- 2018 LG, 2018 JN1, 2018 JC5, 2018 HH2, 2018 BH6
V16Dark Sky New Mexico Obs. in New Mexico, 1 in MPEC 2018-L17 -- 2018 EJ4
J95Great Shefford Obs. in England, 1 in MPEC 2018-L13 -- 2018 LK
238Grorudalen Obs. in Norway, 1 in MPEC 2018-L17 -- 66391
A17Guidestar Obs. in Germany, 2 in MPECs 2018-L13 & 2018-L16 -- 2018 LN, 2018 LK
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-L17 -- 518635
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-L13 -- 2018 LK
246KLENOT in the Czech Republic, 3 in MPECs 2018-L13, 2018-L15 & 2018-L16 -- 2018 LN, 2018 LM, 2018 LK
K38M57 Obs. in Italy, 2 in MPECs 2018-L13 & 2018-L16 -- 2018 LN, 2018 LK
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2018-L14 & 2018-L17 -- 2018 LL, 2015 DP155, 513182, 337228, 162269, 1866
628Mulheim-Ruhr Obs. in Germany, 1 in MPEC 2018-L17 -- 68950
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-L13 -- 2018 LK
C23Olmen Obs. in Belgium, 1 in MPEC 2018-L13 -- 2018 LK
I41Palomar Transient Factory (PTF) in southern California, 4 in MPEC 2018-L17 -- 54686, 474574, 15745, 138847
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2018-L13 & 2018-L17 -- 2018 LK, 2018 JV2, 88254, 85490, 518646, 516976, 508796, 363790, 36183, 24761
F52Pan-STARRS 2 (PS2) in Hawaii, 7 in MPECs 2018-L16 & 2018-L17 -- 2018 LN, 2001 SC170, 514652, 513182, 504711, 138847, 4257
L04ROASTERR-1 in Romania, 1 in MPEC 2018-L13 -- 2018 LK
247roving observer, 1 in MPEC 2018-L17 -- 2018 EJ4
H36Sandlot Obs. in Kansas, 2 in MPECs 2018-L15 & 2018-L16 -- 2018 LN, 2018 LM
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-L16 -- 2018 LN
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-L13 -- 2018 LK
Y00SONEAR in Brazil, 1 in MPEC 2018-L13 -- 2018 LK
691Spacewatch 0.9m telescope in Arizona, 3 in MPECs 2018-L16 & 2018-L17 -- 2018 LN, 2018 JQ1, 2016 CX264
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2018-L17 -- 2018 LC, 2015 QM3
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-L16 -- 2018 LN
I52Steward Obs. Mt. Lemmon Station in Arizona, 15 in MPECs 2018-L14, 2018-L15, 2018-L16 & 2018-L17 -- 2018 LN, 2018 LM, 2018 LL, 2018 LJ, 2018 LG, 2018 LC, 2018 KV, 2018 KR2, 2018 KL2, 2018 KC3, 2018 JS1, 2018 JE5, 2018 EJ4, 2018 BY2, 2017 WH14
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2018-L13 -- 2018 LK
L01Visnjan Obs., 4 in MPECs 2018-L13, 2018-L14, 2018-L15 & 2018-L16 -- 2018 LN, 2018 LM, 2018 LL, 2018 LK
E08Wobblesock Obs. in New South Wales, 3 in MPECs 2018-L13, 2018-L15 & 2018-L16 -- 2018 LN, 2018 LM, 2018 LK
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 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 LMJPL Sentry16022111-211112.092e-07-7.15-7.150JPL: Computed at 04:37 today Pacific time based on 29 observations spanning 1.9069 days (2018-Jun-04.25437 to 2018-Jun-06.16123). Diameter approximately 0.034 km. from weighted mean H=24.99.
NEODyS16022072-211662.77e-07-6.88-7.020NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2018-06-04.255 to 2018-06-06.162."

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 6 June '18

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

1851Generated Traffic Report
1602Noted that JPL Sentry has posted 2018 LM as an impact risk - see above
Noted that NEODyS has posted 2018 LM as an impact risk - see above
Grabbed MPEC 2018-L14 - 2018 LL - see above
Grabbed MPEC 2018-L15 - 2018 LM - see above
Grabbed MPEC 2018-L16 - 2018 LN - see above
Grabbed MPEC 2018-L17 - Daily Orbit Update - see above
0330Grabbed MPEC 2018-L13 - 2018 LK - see above