Contents  on 15 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 15 June '18

Six objects reported inside ten LD

Six minor planets are reported inside ten lunar distances (LD) of Earth today. Nearest by far is risk-listed intruder 2018 LV3, which started the day inside the Earth-Moon system at 0.90 LD from Earth, passed us at 0.86 LD at 0230 UTC and missed the Moon by 1.51 LD at 0647 UTC, and will close out the day 2.39 LD from our planet.

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 today 2018 LV3 17 m  0.86 LD June 11 - 19 intruder today, Earth closest at 0230 UTC,
Moon closest 1.51 LD at 0647 UTC, risk
1.56 LD yesterday 2018 LD1 18 m  1.77 to 3.63 LD June 10 - 18 exits Earth SOI, risk
3.64 LD June 11 2018 LW3 21 m  8.00 to 9.93 LD June 7 - 16
5.56 LD June 10 2018 EJ4 186 m  8.05 to 9.10 LD June 4 - 16 radar/NHATS target
7.62 LD today 2018 LK 155 m  7.62 LD June 13 - 18 Earth closest at 2026 UTC - DOU
8.96 LD June 11 2015 DP155 162 m  9.72 to 10.15 LD June 6 - 15 NHATS target, exits ten LD - DOU
Approaching
6.0   LD June 29* 2018 LR3 18 m  12.9 from 13.7 LD June 20 - July 8 Earth passage uncertainty +/- 6 mins.*,
NHATS target, risk

This report was generated at 1820 UTC with today's DOU MPEC belatedly announcing the discovery of 2018 KC4, which flew by us at about 2.4 LD on May 24th. The DOU also reports the recovery of distant 207398 2006 AS2 and follow-up for two objects active in the above table as well as departed risk-listed objects 2018 LE1 and 2018 LM.



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. "Distant" is used here to describe objects that have approached Earth within ten LD since A/CC began these traffic reports eleven years ago but are not presently coming so close. 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 15 June '18

The MPC's NEO Confirmation Page has 79 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 79 objects listed. Of these, 29 were "one nighters." So far The Tracking News has counted a total of 80 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 15 June '18

Minor Planet Electronic Circulars

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


<< DOU on 15 June '18 >>  MPEC 2018-L78 - "12:04 UT" - Daily Orbit Update


MPEC 2018-L77 - "00:07 UT" - 2005 PP

Observers  on 15 June '18

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2018-L78 -- 2018 KH, 2018 JZ2, 2018 JO1, 2015 YP10, 2011 SR5, 2005 RB, 518507, 341050, 143637
T05ATLAS Haleakala in Hawaii, 11 in MPEC 2018-L78 -- 2018 KC4, 2005 UY5, 96189, 86829, 518735, 385843, 209924, 190161, 17274, 5646, 4197
T08ATLAS Mauna Loa in Hawaii, 12 in MPEC 2018-L78 -- 2018 KC4, 96189, 67367, 405212, 374851, 164121, 136839, 6456, 5646, 4197, 1916, 1685
X74Campo dos Amarais Obs., 1 in MPEC 2018-L78 -- 4954
703Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2018-L78 -- 2018 LK, 2018 KC3, 87309, 518640, 162168, 154268, 4596, 1627, 433
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2018-L78 -- 2018 LM, 2018 LH, 2018 FP3
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPEC 2018-L78 -- 2018 LM, 2018 LB1
J95Great Shefford Obs. in England, 1 in MPEC 2018-L78 -- 2018 LK
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-L78 -- 283729
Q628N. Falla in England via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-L78 -- 86324
K38M57 Obs. in Italy, 1 in MPEC 2018-L78 -- 2018 GA5
474Mt. John Obs. in New Zealand, 4 in MPECs 2018-L77 & 2018-L78 -- 2018 LM, 2017 XC62, 2016 JN34, 2005 PP
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPEC 2018-L78 -- 2018 LK, 2018 JC3, 89959, 508767, 468909, 219021, 207398, 162168, 138847
J69North Obs. in England, 1 in MPEC 2018-L78 -- 2015 DP155
C23Olmen Obs. in Belgium, 2 in MPEC 2018-L78 -- 66391, 1627
F51Pan-STARRS 1 (PS1) in Hawaii, 18 in MPECs 2018-L77 & 2018-L78 -- 2018 LT3, 2018 LC1, 2018 JV2, 2018 JE5, 2018 JB3, 2012 MM11, 2008 MR1, 2005 PP, 2004 RO111, 505178, 468909, 463387, 40263, 154268, 136839, 7888, 5646, 887
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2018-L78 -- 508796, 242708
Y00SONEAR in Brazil, 1 in MPEC 2018-L78 -- 467309
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-L78 -- 15745
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-L78 -- 2018 LC
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-L78 -- 467309
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-L78 -- 2018 LE1, 2018 LB1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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 LM4NEODyS15002028-2118341.57e-07-3.30-3.79n/aNEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2018-06-11.451 to 2018-06-14.459."
2018 LV3NEODyS1500206111.34e-07-7.53-7.530NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2018-06-11.383 to 2018-06-14.182."
2018 LR3NEODyS15002077-2111174.26e-06-6.36-6.490NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2018-06-10.326 to 2018-06-14.262."
2018 LR2NEODyS1500R E M O V E D-
2018 LE1JPL Sentry15002102-210212.266e-06-7.33-7.330JPL: Computed at 07:26 today Pacific time based on 47 observations spanning 8.0897 days (2018-Jun-05.39422 to 2018-Jun-13.483888). Diameter approximately 0.010 km. from weighted mean H=27.68.
NEODyS15002066-211252.06e-06-7.38-7.390NEODyS: "Based on 46 optical observations (of which 1 are rejected as outliers) from 2018-06-05.395 to 2018-06-13.380."
2018 LD1NEODyS1500208911.79e-08-8.61-8.610NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2018-06-05.341 to 2018-06-13.388."
2018 LB1NEODyS1609R E M O V E DNEODyS #2 for the day
2018 LMNEODyS1500R E M O V E D-
JPL Sentry15002112-211621.0527e-06-6.56-6.680JPL: Computed at 07:33 today Pacific time based on 83 observations spanning 10.783 days (2018-Jun-04.25437 to 2018-Jun-15.03696). Diameter approximately 0.031 km. from weighted mean H=25.19.
2018 JG1NEODyS15002111-211837.15e-09-8.30-8.59n/aNEODyS: "Based on 80 optical observations (of which 0 are rejected as outliers) from 2018-05-08.180 to 2018-06-13.613."
2018 HJ2NEODyS15002085-211435.46e-06-5.37-5.520NEODyS: "Based on 106 optical observations (of which 0 are rejected as outliers) from 2018-04-23.412 to 2018-05-23.461."

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 15 June '18

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

1820Generated Traffic Report
1609Noted that NEODyS has removed 2018 LB1 as an impact risk - see above
1500Noted that NEODyS has updated its 2018 HJ2 risk assessment - see above
Noted that NEODyS has updated its 2018 JG1 risk assessment - see above
Noted that NEODyS has updated its 2018 LB1 risk assessment - see above
Noted that NEODyS has updated its 2018 LD1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 LE1 risk assessment - see above
Noted that NEODyS has updated its 2018 LE1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 LM risk assessment - see above
Noted that NEODyS has removed 2018 LM as an impact risk - see above
Noted that NEODyS has posted 2018 LM4 as an impact risk - see above
Noted that NEODyS has removed 2018 LR2 as an impact risk - see above
Noted that NEODyS has posted 2018 LR3 as an impact risk - see above
Noted that NEODyS has posted 2018 LV3 as an impact risk - see above
Grabbed MPEC 2018-L78 - Daily Orbit Update - see above
0017Grabbed MPEC 2018-L77 - 2005 PP - see above