Contents  on 11 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 11 June '18

Five objects reported inside ten LD

Five planetesimals are reported inside ten lunar distances (LD) of Earth today. Nearest are two outbound objects. 2018 LR2 moves away from 4.52 to 5.93 LD and 2018 EJ4 from 5.56 to 5.80 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
1.54 LD June 6 2018 LU2 16 m  9.98 to 12.15 LD June 1 - 11 NHATS target, exits ten LD - DOU
1.57 LD June 14 2018 LD1 18 m  6.75 from 9.16 LD yesterday - June 18 risk - DOU
3.93 LD June 9 2018 LR2 25 m  4.52 to 5.93 LD June 5 - 14 DOU
5.56 LD yesterday 2018 EJ4 186 m  5.56 to 5.80 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD today 2015 DP155 162 m  8.96 LD June 6 - 15 NHATS target, Earth closest at 0553 UTC - DOU
Approaching
7.62 LD June 15 2018 LK 152 m  13.18 from 15.54 LD June 13 - 18 DOU

This report was generated at 1917 UTC with follow-up in today's DOU MPEC for all six close and approaching objects in the above table as well as for five departed objects: 2018 LU2, 2018 LL, 68347 2001 KB67, and risk-listed 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. 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 11 June '18

The MPC's NEO Confirmation Page has 36 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 36 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 38 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 11 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.


MPEC 2018-L53 - "14:52 UT" - Comet C/2018 EN4 (Neowise)


<< DOU on 11 June '18 >>  MPEC 2018-L52 - "12:03 UT" - Daily Orbit Update

Observers  on 11 June '18

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPECs 2018-L52 & 2018-L53 -- 2018 LL, 2018 KP1, 2018 JF, C/2018 EN4, 2016 LE51, 2015 JP, 2014 UV, 2012 TZ52, 208115, 143637
T05ATLAS Haleakala in Hawaii, 16 in MPEC 2018-L52 -- 2015 DP155, 85989, 68347, 66391, 516976, 516420, 467309, 455550, 450648, 17511, 17181, 15745, 154268, 152931, 139345, 1627
T08ATLAS Mauna Loa in Hawaii, 16 in MPEC 2018-L52 -- 2018 EJ4, 96189, 86324, 65706, 518469, 436775, 405212, 374851, 190161, 18882, 17274, 164121, 136839, 6456, 1916, 1685
703Catalina Sky Survey (CSS) in Arizona, 14 in MPEC 2018-L52 -- 2018 LN, 2018 BY2, 2015 HH10, 2013 QH10, 54401, 518640, 518635, 518426, 467309, 415029, 337084, 11500, 1865, 1627
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 4 in MPEC 2018-L52 -- 2018 LE1, 2018 LB1, 2018 KD3, 2013 NT11
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-L53 -- C/2018 EN4
G58Chabot Obs. in northern California, 2 in MPEC 2018-L52 -- 68347, 139345
157Frasso Sabino Obs. in Italy, 2 in MPEC 2018-L52 -- 2018 JE5, 153957
I114Joseph Masiero in southern California via Gemini South Obs. in Chile, 1 in MPEC 2018-L53 -- C/2018 EN4
K73Gravina Obs. in Italy, 3 in MPEC 2018-L52 -- 66391, 138847, 1627
J95Great Shefford Obs. in England, 2 in MPEC 2018-L52 -- 2018 LR2, 2018 LK
U695Hidetaka Sato in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2018-L53 -- C/2018 EN4
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-L53 -- C/2018 EN4
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-L53 -- C/2018 EN4
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2018-L53 -- C/2018 EN4
474Mt. John Obs. in New Zealand, 1 in MPEC 2018-L53 -- C/2018 EN4
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPEC 2018-L52 -- 2018 LG1, 2017 NK, 2012 LF11, 86067, 68350, 470310, 465892, 415029, 163692, 1865
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-L52 -- 2018 EJ4
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2018-L52 -- 2018 LK
I41Palomar Transient Factory (PTF) in southern California, 11 in MPEC 2018-L52 -- 2017 WH14, 2001 SC170, 85989, 68350, 53435, 516420, 504711, 474574, 439313, 15745, 138847
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPEC 2018-L52 -- 2018 LB1, 2018 JC3, 494999, 468910, 468909, 338172, 288592, 5011
F52Pan-STARRS 2 (PS2) in Hawaii, 3 in MPEC 2018-L52 -- 2018 JY1, 2018 BL3, 719
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-L53 -- C/2018 EN4
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-L53 -- C/2018 EN4
Y00SONEAR in Brazil, 2 in MPEC 2018-L52 -- 2018 EJ4, 242708
587Sormano Obs. in Italy, 1 in MPEC 2018-L52 -- 2018 LS2
691Spacewatch 0.9m telescope in Arizona, 16 in MPECs 2018-L52 & 2018-L53 -- 2018 LM, 2018 LF1, 2018 LE1, 2018 LD1, 2018 LC1, 2018 LC, 2018 LB1, 2018 KR2, 2018 KL, 2018 KK2, 2018 JF, C/2018 EN4, 2018 AL13, 2015 HH10, 253062, 136839
291Spacewatch 1.8m telescope in Arizona, 10 in MPEC 2018-L52 -- 2018 LF3, 2018 LB1, 2018 KC2, 2018 JS2, 2018 JJ2, 2018 FS3, 2017 NK, 2014 US192, 2010 LT108, 2005 RB
I52Steward Obs. Mt. Lemmon Station in Arizona, 29 in MPECs 2018-L52 & 2018-L53 -- 2018 LV2, 2018 LU2, 2018 LQ2, 2018 LP2, 2018 LN2, 2018 LN, 2018 LM2, 2018 LM, 2018 LL2, 2018 LK, 2018 LJ1, 2018 LH, 2018 LG1, 2018 LG, 2018 LF1, 2018 LC1, 2018 KV, 2018 KM2, 2018 KM1, 2018 KL2, 2018 KF3, 2018 JV2, 2018 JS1, 2018 JQ1, 2018 JE5, C/2018 EN4, 2018 BY2, 2018 BL3, 2017 WH14
A71Stixendorf Obs. in Austria, 1 in MPEC 2018-L53 -- C/2018 EN4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-L52 -- 2017 KB3
C51WISE in Earth polar orbit, 1 in MPEC 2018-L53 -- C/2018 EN4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 LE1JPL Sentry15352066-210233.394574e-06-7.15-7.150JPL: Computed at 07:15 today Pacific time based on 39 observations spanning 5.8880 days (2018-Jun-05.39422 to 2018-Jun-11.28225). Diameter approximately 0.010 km. from weighted mean H=27.66.
2018 LD1JPL Sentry15352116-211617.895e-08-8.09-8.090JPL: Computed at 07:13 today Pacific time based on 36 observations spanning 5.9242 days (2018-Jun-05.34064 to 2018-Jun-11.26486). Diameter approximately 0.018 km. from weighted mean H=26.38.
2018 LB1JPL Sentry15352032-206320.00011022058-1.14-1.141JPL: Computed at 07:20 June 10th Pacific time based on 27 observations spanning 20.758 days (2018-May-19.425541 to 2018-Jun-09.18336). Diameter approximately 0.320 km. from weighted mean H=20.13.
2018 LMJPL Sentry15352112-211621.0037e-06-6.56-6.680JPL: Computed at 07:19 today Pacific time based on 72 observations spanning 6.9152 days (2018-Jun-04.25437 to 2018-Jun-11.1696). Diameter approximately 0.032 km. from weighted mean H=25.15.
2017 KB3JPL Sentry15352100-211743.66747e-08-7.78-7.840JPL: Computed at 07:07 today Pacific time based on 46 observations spanning 13.160 days (2017-May-17.21791 to 2017-May-30.378137). Diameter approximately 0.033 km. from weighted mean H=25.07.

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 11 June '18

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

1917Generated Traffic Report
1634Grabbed MPEC 2018-L53 - Comet C/2018 EN4 (Neowise) - see above
1535Noted that JPL Sentry has updated its 2017 KB3 risk assessment - see above
Noted that JPL Sentry has updated its 2018 LB1 risk assessment - see above
Noted that JPL Sentry has reposted 2018 LD1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 LE1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 LM risk assessment - see above
Grabbed MPEC 2018-L52 - Daily Orbit Update - see above