Contents  on 18 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 18 June '18

Six objects reported inside ten LD

There are six minor objects reported to be less than ten lunar distances (LD) from Earth today. Nearest is risk-listed intruder 2018 LV3, which moves out from 7.24 to 9.70 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
0.86 LD June 15 2018 LV3 17 m  7.24 to 9.70 LD June 11 - 19 intruder, risk
1.56 LD June 14 2018 LD1 18 m  8.33 to 10.76 LD June 10 - 18 exits ten LD, risk
5.22 LD June 21 2018 LX5 29 m  8.95 from 11.20 LD today - June 24 enters ten LD
6.50 LD June 21 2018 LS5 15 m  8.73 from 10.20 LD today - June 25 enters ten LD
7.49 LD June 20 2018 MK 51 m  9.36 from 12.08 LD today - June 22 NEW, enters ten LD - MPEC
7.62 LD June 15 2018 LK 155 m  9.70 to 11.63 LD June 13 - 18 exits ten LD
Approaching
6.02 LD June 29 2018 LR3 18 m  10.82 from 11.51 LD June 20 - July 8 NHATS target, risk - DOU

This report was generated at 1846 UTC with the discoveries of inbound 2018 MK (MPEC) and already departed 2018 MJ (MPEC), which went past us at 4.17 LD on June 13th. Today's DOU MPEC has follow-up for approaching risk-listed 2018 LR3 and for departed objects 2018 LR2 (risk), 2015 DP155, and 68347 2001 KB67.



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 18 June '18

The MPC's NEO Confirmation Page has 78 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 78 objects listed. Of these, 29 were "one nighters." So far The Tracking News has counted a total of 109 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 18 June '18

Minor Planet Electronic Circulars

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


MPEC 2018-M36 - "18:15 UT" - 2018 LZ13


MPEC 2018-M35 - "14:26 UT" - 2018 MK


MPEC 2018-M34 - "14:21 UT" - 2018 MJ


MPEC 2018-M33 - "14:15 UT" - 2018 MH


MPEC 2018-M32 - "14:09 UT" - 2018 LT6


MPEC 2018-M31 - "14:04 UT" - 2018 LS6


MPEC 2018-M30 - "13:59 UT" - 2018 LR6


MPEC 2018-M29 - "13:52 UT" - 2018 LQ6


MPEC 2018-M28 - "13:46 UT" - 2018 LO6


<< DOU on 18 June '18 >>  MPEC 2018-M27 - "12:04 UT" - Daily Orbit Update

Observers  on 18 June '18

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

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 2 in MPECs 2018-M30 & 2018-M32 -- 2018 LT6, 2018 LR6
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2018-M27 & 2018-M36 -- 2018 LZ13, 2018 LL5
T05ATLAS Haleakala in Hawaii, 3 in MPECs 2018-M27, 2018-M30 & 2018-M35 -- 2018 MK, 2018 LR6, 2015 DP155
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2018-M32 -- 2018 LT6
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2018-M27 -- 3552
160Castelmartini Obs. in Italy, 7 in MPECs 2018-M27 & 2018-M32 -- 2018 LT6, 68347, 66391, 467309, 15745, 153957, 1627
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2018-M29, 2018-M30 & 2018-M36 -- 2018 LZ13, 2018 LR6, 2018 LQ6
I19El Gato Gris Obs. in Argentina, 2 in MPECs 2018-M30 & 2018-M32 -- 2018 LT6, 2018 LR6
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-M32 -- 2018 LT6
157Frasso Sabino Obs. in Italy, 1 in MPEC 2018-M32 -- 2018 LT6
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-M32 -- 2018 LT6
568^R. Wainscoat on Mauna Kea in Hawaii, 6 in MPECs 2018-M27, 2018-M28, 2018-M31, 2018-M33 & 2018-M36 -- 2018 MH, 2018 MA, 2018 LZ13, 2018 LS6, 2018 LO6, 1999 RB32
900Moriyama Obs. in Japan, 1 in MPEC 2018-M32 -- 2018 LT6
474Mt. John Obs. in New Zealand, 2 in MPECs 2018-M29 & 2018-M30 -- 2018 LR6, 2018 LQ6
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2018-M27 -- 2018 LO5
0895N.V. Maigurova via Nikolaev Obs. in Ukraine, 2 in MPEC 2018-M27 -- 2015 DP155, 139345
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-M27 -- 68347
F51Pan-STARRS 1 (PS1) in Hawaii, 29 in MPECs 2018-M27, 2018-M28, 2018-M29, 2018-M31, 2018-M33, 2018-M34, 2018-M35 & 2018-M36 -- 2018 MK, 2018 MJ, 2018 MH, 2018 LZ13, 2018 LS6, 2018 LQ6, 2018 LO6, 2018 LO5, 2018 LO3, 2018 LN, 2018 LE4, 2017 UY5, 2015 YP10, 2015 WO2, 2013 JG29, 2012 RS16, 2006 YP, 2002 OS4, 1999 RV2, 508767, 507847, 450648, 357414, 24761, 193178, 18882, 7341, 5626, 5011
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-M27 -- 7025
K63Pascoli Obs. in Italy, 1 in MPEC 2018-M32 -- 2018 LT6
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2018-M33 -- 2018 MH
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2018-M32, 2018-M34 & 2018-M35 -- 2018 MK, 2018 MJ, 2018 LT6
G40*program code "*" (19) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-M32 -- 2018 LT6
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2018-M27, 2018-M28, 2018-M29 & 2018-M32 -- 2018 LT6, 2018 LQ6, 2018 LO6, 2018 LC3, 2016 CX264
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2018-M27 & 2018-M36 -- 2018 LZ13, 2018 LR3
W34Squirrel Valley Obs. in North Carolina, 3 in MPECs 2018-M27, 2018-M32 & 2018-M35 -- 2018 MK, 2018 LT6, 25916
I52Steward Obs. Mt. Lemmon Station in Arizona, 5 in MPECs 2018-M28, 2018-M29, 2018-M31, 2018-M33 & 2018-M34 -- 2018 MJ, 2018 MH, 2018 LS6, 2018 LQ6, 2018 LO6
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-M27 -- 2018 LR2, 2018 LM4
L01Visnjan Obs., 4 in MPECs 2018-M31, 2018-M32, 2018-M33 & 2018-M35 -- 2018 MK, 2018 MH, 2018 LT6, 2018 LS6
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 LZ13JPL Sentry21042036-2113354.670733e-07-3.40-3.690JPL: Computed at 12:32 today Pacific time based on 18 observations spanning 2.7861 days (2018-Jun-15.52506 to 2018-Jun-18.31119). Diameter approximately 0.271 km. from weighted mean H=20.45.
2018 LM4NEODyS1534R E M O V E D-
JPL Sentry1500R E M O V E DJPL: Risk listing removed at 1402 UTC today
2018 LR3JPL Sentry15002077-211158.7998e-06-6.01-6.080JPL: Computed at 07:06 today Pacific time based on 31 observations spanning 7.9301 days (2018-Jun-10.32538 to 2018-Jun-18.25548). Diameter approximately 0.018 km. from weighted mean H=26.35.

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 18 June '18

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

2104Noted that JPL Sentry has posted 2018 LZ13 as an impact risk - see above
1846Generated Traffic Report
1832Grabbed MPEC 2018-M36 - 2018 LZ13 - see above
1534Noted that NEODyS has removed 2018 LM4 as an impact risk - see above
1500Noted that JPL Sentry has removed 2018 LM4 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 LR3 risk assessment - see above
Grabbed MPEC 2018-M27 - Daily Orbit Update - see above
Grabbed MPEC 2018-M28 - 2018 LO6 - see above
Grabbed MPEC 2018-M29 - 2018 LQ6 - see above
Grabbed MPEC 2018-M30 - 2018 LR6 - see above
Grabbed MPEC 2018-M31 - 2018 LS6 - see above
Grabbed MPEC 2018-M32 - 2018 LT6 - see above
Grabbed MPEC 2018-M33 - 2018 MH - see above
Grabbed MPEC 2018-M34 - 2018 MJ - see above
Grabbed MPEC 2018-M35 - 2018 MK - see above