Contents  on 8 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 8 June '18

Two objects reported inside ten LD

Two asteroids are reported inside ten lunar distances (LD) of our planet today. Nearest is 2018 EJ4, which is inbound from 6.79 to 6.10 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
5.56 LD June 10 2018 EJ4 186 m  6.10 from 6.79 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  9.23 from 9.52 LD June 6 - 15 NHATS target
Approaching (sorted by 10-LD bubble entry date)
1.6   LD June 14* 2018 LD1 18 m  14.1 from 16.5 LD June 10 - 18 Earth passage uncertainty +/- 5 mins.*, risk - DOU
7.62 LD June 15 2018 LK 147 m  20.60 from 23.23 LD June 13 - 18

This report was generated at 1823 UTC with follow-up in today's DOU MPEC for approaching risk-listed 2018 LD1, inbound 2018 EJ4, and departed risk-listed objects 2018 LE1 and 2018 LM, plus astrometry from March for 2003 FY6.



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 8 June '18

The MPC's NEO Confirmation Page has 24 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 24 objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 36 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 8 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-L36 - "23:31 UT" - Comet P/2018 L1 (Panstarrs)


MPEC 2018-L35 - "21:10 UT" - 2018 KB4


MPEC 2018-L34 - "20:20 UT" - 2013 JG29


MPEC 2018-L33 - "18:31 UT" - 2018 LM2


MPEC 2018-L32 - "18:25 UT" - 2018 LN2


MPEC 2018-L31 - "18:21 UT" - 2018 LL2


MPEC 2018-L30 - "18:18 UT" - 2018 LK2


<< DOU on 8 June '18 >>  MPEC 2018-L29 - "12:03 UT" - Daily Orbit Update

Observers  on 8 June '18

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-L29 -- 2004 LB
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2018-L29 -- 2018 LM, 2018 GL, 2016 EE158, 2015 YP10, 2014 UV, 2012 OZ, 2061
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2018-L29 -- 1866
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2018-L29 -- 2018 KR2, 2004 LB, 467309, 25916
I47Auger Obs. in Argentina, 1 in MPEC 2018-L35 -- 2018 KB4
703Catalina Sky Survey (CSS) in Arizona, 11 in MPEC 2018-L29 -- 2018 KV, 2018 EJ4, 2013 QH10, 1999 LK1, 86666, 518640, 518635, 516976, 186822, 154268, 8037
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2018-L29 & 2018-L30 -- 2018 LK2, 2018 KE3, 2018 HT3
006Fabra Obs. in Spain, 1 in MPEC 2018-L29 -- 66391
E105Richard Miles in England via Faulkes Telescope South in New South Wales, 1 in MPEC 2018-L35 -- 2018 KB4
I114Joseph Masiero in southern California via Gemini South Obs. in Chile, 1 in MPEC 2018-L30 -- 2018 LK2
J77Golden Hill Obs. in England, 1 in MPEC 2018-L35 -- 2018 KB4
J95Great Shefford Obs. in England, 1 in MPEC 2018-L31 -- 2018 LL2
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2018-L35 & 2018-L36 -- P/2018 L1, 2018 KB4
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-L31 -- 2018 LL2
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2018-L29 -- 2003 FY6
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2018-L29 -- 2003 FY6
Q63LCO Siding Spring A in New South Wales, 1 in MPEC 2018-L29 -- 2003 FY6
K91LCO Sutherland A in South Africa, 1 in MPEC 2018-L35 -- 2018 KB4
568^R. Wainscoat on Mauna Kea in Hawaii, 2 in MPECs 2018-L35 & 2018-L36 -- P/2018 L1, 2018 KB4
711McDonald Obs. in Texas, 1 in MPEC 2018-L32 -- 2018 LN2
474Mt. John Obs. in New Zealand, 16 in MPECs 2018-L29 & 2018-L30 -- 2018 LK2, 2018 LH, 2018 KE3, 2018 JZ1, 2018 JA3, 2018 HT3, 2018 FE5, 2018 DJ4, 2017 YF5, 2017 CO32, 2016 NT22, 2011 GA62, 2009 SK104, 2009 HW44, 2004 PY27, 2004 LB
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2018-L29, 2018-L31, 2018-L32, 2018-L33 & 2018-L36 -- 2018 LN2, 2018 LM2, 2018 LL2, P/2018 L1, 2017 WH14, 2014 YP15, 518678, 436771, 162980, 138937
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-L29 -- 2018 EJ4
C23Olmen Obs. in Belgium, 2 in MPEC 2018-L29 -- 66391, 1627
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2018-L29, 2018-L31, 2018-L34, 2018-L35 & 2018-L36 -- 2018 LL2, P/2018 L1, 2018 KB4, 2013 JG29, 53435, 285339
D29Purple Mtn. Obs. Xuyi Station in China, 6 in MPEC 2018-L29 -- 85628, 85490, 518646, 508796, 36183, 159533
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-L35 -- 2018 KB4
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-L36 -- P/2018 L1
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPECs 2018-L35 & 2018-L36 -- P/2018 L1, 2018 KB4
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-L36 -- P/2018 L1
691Spacewatch 0.9m telescope in Arizona, 19 in MPECs 2018-L29 & 2018-L36 -- 2018 LM, 2018 LE1, 2018 LD1, P/2018 L1, 2018 KM1, 2018 KL, 2018 KK2, 2018 KD1, 2018 KC3, 2018 JY1, 2018 JV2, 2018 JP1, 2018 JJ2, 2018 JF, 2018 AP12, 2011 RF, 1999 RV2, 253062, 136839
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2018-L29 -- 2018 LH, 2018 LB1, 2018 KP1, 2018 KF3, 2018 JW1, 2018 FO5
I52Steward Obs. Mt. Lemmon Station in Arizona, 22 in MPECs 2018-L29, 2018-L31, 2018-L32, 2018-L33, 2018-L35 & 2018-L36 -- 2018 LN2, 2018 LN, 2018 LM2, 2018 LM, 2018 LL2, 2018 LJ, 2018 LH, 2018 LC, P/2018 L1, 2018 KV, 2018 KH1, 2018 KG1, 2018 KD3, 2018 KD1, 2018 KB4, 2018 KB1, 2018 JE5, 2018 GA5, 2017 WH14, 2017 MT8, 2017 GT5, 2014 JM25
L01Visnjan Obs., 3 in MPECs 2018-L31, 2018-L32 & 2018-L35 -- 2018 LN2, 2018 LL2, 2018 KB4
C51WISE in Earth polar orbit, 1 in MPEC 2018-L30 -- 2018 LK2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 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 LK2JPL Sentry20052029-2110271.310641e-07-4.35-4.900JPL: Computed at 12:30 today Pacific time based on 20 observations spanning 5.4743 days (2018-Jun-02.93056 to 2018-Jun-08.40482). Diameter approximately 0.340 km. from weighted mean H=20.00.
2018 LE1JPL Sentry14412066-2103116.56045e-06-6.70-7.270JPL: Computed at 07:35 today Pacific time based on 21 observations spanning 2.7914 days (2018-Jun-05.39422 to 2018-Jun-08.1856). Diameter approximately 0.011 km. from weighted mean H=27.45.
NEODyS14412066-2117264.24e-06-6.98-7.140NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2018-06-05.395 to 2018-06-07.365."
2018 LD1JPL Sentry14412061-208931.85071e-07-7.37-7.380JPL: Computed at 07:31 today Pacific time based on 21 observations spanning 2.8544 days (2018-Jun-05.34064 to 2018-Jun-08.19505). Diameter approximately 0.018 km. from weighted mean H=26.38.
NEODyS14412061-2116111.93e-07-7.49-7.820NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2018-06-05.341 to 2018-06-07.324."
2018 LB1JPL Sentry16262032-206328.209208e-05-1.26-1.261JPL #2 for the day: Computed at 07:28 today Pacific time based on 21 observations spanning 19.888 days (2018-May-19.425541 to 2018-Jun-08.31341). Diameter approximately 0.320 km. from weighted mean H=20.13.
NEODyS16262032-206351.85e-05-1.96-1.960NEODyS #2 for the day: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2018-05-19.426 to 2018-06-08.314."
2018 LMJPL Sentry14412112-211627.738e-07-6.67-6.790JPL: Computed at 07:37 today Pacific time based on 49 observations spanning 3.9503 days (2018-Jun-04.25437 to 2018-Jun-08.20464). Diameter approximately 0.032 km. from weighted mean H=25.15.
NEODyS14412111-211626.83e-08-7.71-7.710NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2018-06-04.255 to 2018-06-07.178."

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 8 June '18

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

2358Grabbed MPEC 2018-L36 - Comet P/2018 L1 (Panstarrs) - see above
2130Grabbed MPEC 2018-L35 - 2018 KB4 - see above
2030Grabbed MPEC 2018-L34 - 2013 JG29 - see above
2005Noted that JPL Sentry has posted 2018 LK2 as an impact risk - see above
1900Grabbed MPEC 2018-L33 - 2018 LM2 - see above
1832Grabbed MPEC 2018-L30 - 2018 LK2 - see above
Grabbed MPEC 2018-L31 - 2018 LL2 - see above
Grabbed MPEC 2018-L32 - 2018 LN2 - see above
1823Generated Traffic Report
1626Noted that JPL Sentry has updated its 2018 LB1 risk assessment - see above
Noted that NEODyS has updated its 2018 LB1 risk assessment - see above
1441Noted that JPL Sentry has posted 2018 LB1 as an impact risk - see above
Noted that NEODyS has posted 2018 LB1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 LD1 risk assessment - see above
Noted that NEODyS has posted 2018 LD1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 LE1 risk assessment - see above
Noted that NEODyS has posted 2018 LE1 as an impact risk - see above
Noted that JPL Sentry has reposted 2018 LM as an impact risk - see above
Noted that NEODyS has updated its 2018 LM risk assessment - see above
Grabbed MPEC 2018-L29 - Daily Orbit Update - see above