Contents  on 10 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 10 June '18

Five objects reported inside ten LD

Five visitors are reported moving less than ten lunar distances (LD) from our home world today. Nearest is newly announced 2018 LR2, which is heading out from 3.93 to 4.52 LD, while radar/NHATS target 2018 EJ4 comes its closest to our planet on this passage -- 5.56 LD at 1916 UTC.

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  7.83 to 9.98 LD June 1 - 11 NEW, NHATS target - MPEC, DOU
1.57 LD June 14 2018 LD1 18 m  9.15 from 11.59 LD today - June 18 enters ten LD, risk - DOU
3.93 LD yesterday 2018 LR2 25 m  3.93 to 4.52 LD June 5 - 14 NEW - MPEC
5.56 LD today 2018 EJ4 186 m  5.56 LD June 4 - 16 radar/NHATS target, Earth closest at 1916 UTC - DOU
8.96 LD tomorrow 2015 DP155 162 m  8.96 from 9.05 LD June 6 - 15 NHATS target - DOU
Approaching
7.62 LD June 15 2018 LK 150 m  15.54 from 18.03 LD June 13 - 18 DOU

This report was generated at 1851 UTC with the discoveries announced late yesterday of outbound objects 2018 LR2 (MPEC) and 2018 LU2 (MPEC, DOU). We probably will also be adding 2018 LQ2 (MPEC, DOU) to this reporting. It is currently calculated with some uncertainty to pass Earth at 9.3 LD on August 27th. Today's DOU MPEC has follow-up for five objects in the above active traffic table and for departed objects 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 10 June '18

The MPC's NEO Confirmation Page has 20 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 20 objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 32 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 10 June '18

Minor Planet Electronic Circulars

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


MPEC 2018-L51 - "17:03 UT" - 2018 LF3


MPEC 2018-L50 - "17:00 UT" - 2018 LE3


MPEC 2018-L49 - "16:57 UT" - 2018 LD3


MPEC 2018-L48 - "16:53 UT" - 2018 LC3


<< DOU on 10 June '18 >>  MPEC 2018-L47 - "12:03 UT" - Daily Orbit Update

Observers  on 10 June '18

A total of 36 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPECs 2018-L47 & 2018-L50 -- 2018 LE3, 2005 EZ29, 341050, 2135
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2018-L47 -- 68347, 139289, 1036
T08ATLAS Mauna Loa in Hawaii, 11 in MPEC 2018-L47 -- 1999 LW1, 68347, 66008, 278327, 153957, 139289, 138847, 9856, 3752, 1866, 1580
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-L50 -- 2018 LE3
160Castelmartini Obs. in Italy, 1 in MPEC 2018-L47 -- 139289
703Catalina Sky Survey (CSS) in Arizona, 16 in MPECs 2018-L47 & 2018-L50 -- 2018 LQ2, 2018 LE3, 2018 KV, 2017 WH14, 85989, 68347, 66391, 54401, 516976, 514652, 513182, 450648, 337084, 24761, 139289, 138937
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 6 in MPECs 2018-L47 & 2018-L49 -- 2018 LE1, 2018 LD3, 2018 KU1, 2018 KH, 2018 KD3, 2016 JJ24
006Fabra Obs. in Spain, 1 in MPEC 2018-L47 -- 68347
157Frasso Sabino Obs. in Italy, 1 in MPEC 2018-L47 -- 139289
J95Great Shefford Obs. in England, 1 in MPEC 2018-L50 -- 2018 LE3
Q67JBL Obs., 2 in MPEC 2018-L47 -- 194126, 138847
Z43Landehen Obs., 1 in MPEC 2018-L47 -- 139289
K91LCO Sutherland A in South Africa, 1 in MPEC 2018-L47 -- 2018 LK
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-L47 -- 162168
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2018-L47, 2018-L48 & 2018-L49 -- 2018 LD3, 2018 LC3, 68347, 468730, 457212, 450648, 37655, 337084, 24761, 163758, 139289
628Mulheim-Ruhr Obs. in Germany, 1 in MPEC 2018-L47 -- 68347
0895N.V. Maigurova via Nikolaev Obs. in Ukraine, 2 in MPEC 2018-L47 -- 68347, 139289
J69North Obs. in England, 2 in MPEC 2018-L47 -- 68347, 139289
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-L47 -- 68347
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2018-L47 -- 508767, 186822
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2018-L49 & 2018-L51 -- 2018 LF3, 2018 LD3
A53Peschiera del Garda Obs. in Italy, 3 in MPEC 2018-L47 -- 2018 LK, 2018 EJ4, 2015 DP155
A48Povegliano Veronese Obs. in Italy, 2 in MPEC 2018-L47 -- 2018 EJ4, 2015 DP155
W71Rand II Obs. in New York, 1 in MPEC 2018-L47 -- 68347
619Sabadell Obs. in Spain, 1 in MPEC 2018-L47 -- 68347
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-L50 -- 2018 LE3
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-L50 -- 2018 LE3
G40'program code "'" (16) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-L47 -- 68347
Y00SONEAR in Brazil, 1 in MPEC 2018-L47 -- 4954
587Sormano Obs. in Italy, 2 in MPECs 2018-L47 & 2018-L50 -- 2018 LQ2, 2018 LE3
691Spacewatch 0.9m telescope in Arizona, 16 in MPEC 2018-L47 -- 2018 LT2, 2018 LS2, 2018 LP2, 2018 LM, 2018 LJ1, 2018 LH1, 2018 LE1, 2018 LD1, 2018 KF3, 2018 KD3, 2018 KC3, 2018 JD5, 2018 HS3, 2012 PG6, 2002 PH80, 253062
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-L47 -- 2018 LB1
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-L47 -- 68347, 139289
I52Steward Obs. Mt. Lemmon Station in Arizona, 42 in MPECs 2018-L47, 2018-L48, 2018-L49, 2018-L50 & 2018-L51 -- 2018 LQ2, 2018 LN2, 2018 LN, 2018 LM2, 2018 LM, 2018 LL2, 2018 LJ1, 2018 LJ, 2018 LH1, 2018 LG1, 2018 LG, 2018 LF3, 2018 LF1, 2018 LE3, 2018 LD3, 2018 LD1, 2018 LC3, 2018 LC1, 2018 LC, 2018 KV, 2018 KM2, 2018 KM1, 2018 KL2, 2018 KH1, 2018 KG1, 2018 KF3, 2018 KC3, 2018 KB1, 2018 JY1, 2018 JV2, 2018 JS1, 2018 JQ1, 2018 JJ2, 2018 JE5, 2018 JE1, 2018 JD5, 2018 JD2, 2018 HS3, 2018 GL1, 2018 FS1, 2018 BY2, 2017 NK
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-L47 -- 2017 KB3
L01Visnjan Obs., 4 in MPECs 2018-L47, 2018-L48, 2018-L49 & 2018-L50 -- 2018 LU2, 2018 LE3, 2018 LD3, 2018 LC3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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 Sentry15332066-210363.205672e-06-7.13-7.160JPL: Computed at 07:36 today Pacific time based on 32 observations spanning 4.8213 days (2018-Jun-05.39422 to 2018-Jun-10.21551). Diameter approximately 0.010 km. from weighted mean H=27.59.
NEODyS15332066-2117214.48e-06-6.92-7.280NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2018-06-05.395 to 2018-06-09.186."
2018 LD1JPL Sentry1533R E M O V E DJPL: Risk listing removed at 1429 UTC today
NEODyS15332061-211042.85e-07-7.53-7.580NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2018-06-05.341 to 2018-06-09.209."
2018 LB1NEODyS2100203211.64e-05-2.01-2.010NEODyS #2 for the day: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2018-05-19.426 to 2018-06-09.184."
JPL Sentry15332032-206329.638067e-05-1.20-1.201JPL: Computed at 07:37 June 9th Pacific time based on 24 observations spanning 20.619 days (2018-May-19.425541 to 2018-Jun-09.04458). Diameter approximately 0.320 km. from weighted mean H=20.13.
2018 LMNEODyS21002112-211635.79e-07-6.79-6.870NEODyS: "Based on 59 optical observations (of which 0 are rejected as outliers) from 2018-06-04.255 to 2018-06-09.171."
JPL Sentry15332111-211631.08155e-06-6.51-6.650JPL: Computed at 07:32 today Pacific time based on 66 observations spanning 5.9111 days (2018-Jun-04.25437 to 2018-Jun-10.16548). Diameter approximately 0.032 km. from weighted mean H=25.11.
2017 KB3JPL Sentry15332100-211751.29842e-07-7.18-7.400JPL: Computed at 07:06 today Pacific time based on 41 observations spanning 13.160 days (2017-May-17.21791 to 2017-May-30.378137). Diameter approximately 0.034 km. from weighted mean H=24.98.

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 10 June '18

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

2100Noted that NEODyS has updated its 2018 LB1 risk assessment - see above
Noted that NEODyS has updated its 2018 LM risk assessment - see above
1851Generated Traffic Report
1816Grabbed MPEC 2018-L48 - 2018 LC3 - see above
Grabbed MPEC 2018-L49 - 2018 LD3 - see above
Grabbed MPEC 2018-L50 - 2018 LE3 - see above
Grabbed MPEC 2018-L51 - 2018 LF3 - see above
1533Noted 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 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 JPL Sentry has updated its 2018 LM risk assessment - see above
Grabbed MPEC 2018-L47 - Daily Orbit Update - see above