Contents  on 13 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 13 June '18

Eight objects reported inside ten LD

Today eight transient natural objects are known to be less than ten lunar distances (LD) from Earth. Nearest are risk-listed 2018 LD1, which enters Earth's sphere of gravitational influence, moving in from 4.39 to 2.27 LD, and intruder 2018 LV3, inbound from 5.30 to 2.88 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  2.88 from 5.30 LD June 11 - 19 intruder - DOU
1.57 LD tomorrow 2018 LD1 18 m  2.27 from 4.39 LD June 10 - 18 enters Earth SOI, risk - DOU
3.65 LD June 11 2018 LW3 22 m  4.66 to 6.20 LD June 7 - 16 NEW - MPEC
3.93 LD June 9 2018 LR2 25 m  7.73 to 9.69 LD June 5 - 14 risk
4.62 LD June 8 2018 LG4 12 m  9.02 to 10.68 LD June 4 - 13 NEW, exits ten LD - MPEC
5.56 LD June 10 2018 EJ4 186 m  6.34 to 7.11 LD June 4 - 16 radar/NHATS target
7.62 LD June 15 2018 LK 153 m  9.21 from 11.02 LD today - June 18 enters ten LD - DOU
8.96 LD June 11 2015 DP155 162 m  9.13 to 9.38 LD June 6 - 15 NHATS target - DOU
Approaching
6.0   LD June 29* 2018 LR3 19 m  14.5 from 15.2 LD June 20 - July 8 Earth passage uncertainty +/- 15 mins.*,
NHATS target, risk - DOU

This report was generated at 1751 UTC with the discoveries of outbound objects 2018 LG4 (MPEC) and 2018 LW3 (MPEC), and with follow-up in today's DOU MPEC for five objects in the above active traffic table, and for four departed objects: 2018 LU2, 68347 2001 KB67, and risk-listed 2018 LE1 and 2018 JG1.



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 13 June '18

The MPC's NEO Confirmation Page has 40 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 40 objects listed. Of these, nineteen 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 13 June '18

Minor Planet Electronic Circulars

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


MPEC 2018-L71 - "14:38 UT" - 2018 LG4


MPEC 2018-L70 - "14:34 UT" - 2018 LF4


MPEC 2018-L69 - "14:30 UT" - 2018 LE4


MPEC 2018-L68 - "14:26 UT" - 2018 LD4


<< DOU on 13 June '18 >>  MPEC 2018-L67 - "12:03 UT" - Daily Orbit Update


MPEC 2018-L66 - "10:34 UT" - 2005 KP9


MPEC 2018-L65 - "10:31 UT" - 2004 RO111


MPEC 2018-L64 - "10:19 UT" - 2018 LW3

Observers  on 13 June '18

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2018-L67 -- 2018 JC2, 2018 HJ2, 2018 GM4, 2018 FL3, 2017 XJ62, 2017 MT8, 2015 XP55
T05ATLAS Haleakala in Hawaii, 16 in MPECs 2018-L64 & 2018-L67 -- 2018 LW3, 2018 LD1, 2012 UV27, 96189, 66400, 65706, 518469, 405212, 374851, 283729, 18882, 17274, 6456, 5646, 1916, 1685
T08ATLAS Mauna Loa in Hawaii, 8 in MPECs 2018-L64 & 2018-L67 -- 2018 LW3, 2018 KC3, 2015 DP155, 85989, 68347, 66391, 455550, 1627
703Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2018-L67 & 2018-L69 -- 2018 LE4, 2018 JS1, 2001 SC170, 66391, 53110, 514652, 138847, 4257, 3752, 1866
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-L70 -- 2018 LF4
G58Chabot Obs. in northern California, 2 in MPEC 2018-L67 -- 2018 LQ2, 2018 LC1
G37Discovery Channel Telescope (DCT) in Arizona, 2 in MPEC 2018-L67 -- 2018 LJ1, 2018 LB1
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPECs 2018-L69 & 2018-L71 -- 2018 LG4, 2018 LE4
J77Golden Hill Obs. in England, 1 in MPEC 2018-L69 -- 2018 LE4
J95Great Shefford Obs. in England, 5 in MPECs 2018-L67, 2018-L68, 2018-L69 & 2018-L71 -- 2018 LV3, 2018 LQ3, 2018 LG4, 2018 LE4, 2018 LD4
Q628N. Falla in England via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-L67 -- 96189
C94MASTER-II Tunka in Russia, 1 in MPEC 2018-L67 -- 68950
G96Mt. Lemmon Survey (MLS) in Arizona, 21 in MPECs 2018-L65, 2018-L67, 2018-L68, 2018-L70 & 2018-L71 -- 2018 LG4, 2018 LF4, 2018 LD4, 2018 BY2, 2015 TX143, 2015 HH10, 2010 MS1, 2005 YW93, 2005 MX1, 2004 RO111, 518635, 518426, 438430, 418929, 189173, 154268, 141851, 136818, 12923, 8709, 433
0895N.V. Maigurova via Nikolaev Obs. in Ukraine, 1 in MPEC 2018-L67 -- 68347
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-L67 -- 2018 LK
I41Palomar Transient Factory (PTF) in southern California, 4 in MPEC 2018-L67 -- 2017 WH14, 68350, 53110, 15745
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2018-L66 & 2018-L67 -- 2014 QP266, 2005 KP9, 86829, 174050, 162783, 152931, 11066, 8566, 7977
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2018-L67 -- 2018 LO3
Y28Sertao de Itaparica Obs. in Brazil, 1 in MPEC 2018-L67 -- 2018 JG1
Y00SONEAR in Brazil, 3 in MPECs 2018-L64 & 2018-L67 -- 2018 LW3, 2009 OG, 65706
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2018-L67 -- 2018 LU2, 2018 LR3, 2005 EZ29
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-L67 -- 2018 LE1
I52Steward Obs. Mt. Lemmon Station in Arizona, 13 in MPECs 2018-L65, 2018-L67, 2018-L68, 2018-L69, 2018-L70 & 2018-L71 -- 2018 LV2, 2018 LQ2, 2018 LG4, 2018 LG1, 2018 LF4, 2018 LF1, 2018 LE4, 2018 LE3, 2018 LD4, 2018 LD3, 2018 LC1, 2018 AP12, 2004 RO111
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-L67 -- 2017 GM7
L01Visnjan Obs., 1 in MPEC 2018-L69 -- 2018 LE4
E08Wobblesock Obs. in New South Wales, 1 in MPEC 2018-L69 -- 2018 LE4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 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 LR3JPL Sentry15042077-210994.094632e-06-6.33-6.540JPL: Computed at 07:34 today Pacific time based on 17 observations spanning 2.8649 days (2018-Jun-10.32538 to 2018-Jun-13.1903). Diameter approximately 0.019 km. from weighted mean H=26.25.
2018 LE1JPL Sentry15042066-210231.4435318e-06-7.51-7.530JPL: Computed at 07:36 today Pacific time based on 45 observations spanning 7.9845 days (2018-Jun-05.39422 to 2018-Jun-13.37872). Diameter approximately 0.010 km. from weighted mean H=27.66.
NEODyS15042066-210362.55e-06-7.28-7.290NEODyS: "Based on 43 optical observations (of which 1 are rejected as outliers) from 2018-06-05.395 to 2018-06-12.300."
2018 LD1JPL Sentry1504R E M O V E DJPL: Risk listing removed at 1420 UTC today
NEODyS15042089-211638.55e-08-8.01-8.20NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2018-06-05.341 to 2018-06-12.069."
2018 LB1JPL Sentry15042032-207333.279856e-05-1.61-1.611JPL: Computed at 07:10 today Pacific time based on 55 observations spanning 23.805 days (2018-May-19.425541 to 2018-Jun-12.23056). Diameter approximately 0.330 km. from weighted mean H=20.03.
NEODyS15042032-206362.25e-05-1.82-1.821NEODyS: "Based on 55 optical observations (of which 0 are rejected as outliers) from 2018-05-19.426 to 2018-06-12.231."
2018 LMNEODyS1504211221.0e-06-6.55-6.850NEODyS: "Based on 74 optical observations (of which 0 are rejected as outliers) from 2018-06-04.255 to 2018-06-11.905."
2018 JG1JPL Sentry15042118-211813.044e-08-7.66-7.660JPL: Computed at 07:10 today Pacific time based on 77 observations spanning 33.138 days (2018-May-08.17968 to 2018-Jun-10.317922). Diameter approximately 0.043 km. from weighted mean H=24.48.
2018 HJ2JPL Sentry15042085-208512.425e-08-7.65-7.650JPL: Computed at 07:07 today Pacific time based on 106 observations spanning 30.049 days (2018-Apr-23.41101 to 2018-May-23.46042). Diameter approximately 0.041 km. from weighted mean H=24.58.

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 13 June '18

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

1751Generated Traffic Report
1504Noted that JPL Sentry has updated its 2018 HJ2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 JG1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 LB1 risk assessment - see above
Noted that NEODyS has updated its 2018 LB1 risk assessment - see above
Noted that JPL Sentry has removed 2018 LD1 as an impact risk - 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 NEODyS 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-L64 - 2018 LW3 - see above
Grabbed MPEC 2018-L65 - 2004 RO111 - see above
Grabbed MPEC 2018-L66 - 2005 KP9 - see above
Grabbed MPEC 2018-L67 - Daily Orbit Update - see above
Grabbed MPEC 2018-L68 - 2018 LD4 - see above
Grabbed MPEC 2018-L69 - 2018 LE4 - see above
Grabbed MPEC 2018-L70 - 2018 LF4 - see above
Grabbed MPEC 2018-L71 - 2018 LG4 - see above