Contents  on 9 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 9 June '18

Two objects reported inside ten LD

Bulletin - 2203, updated 2308 & 2336 UTC:  Two new discoveries of close passers have been announced.

Earth passageI D~Size~Inside ten LDNotes
1.54 LD at 1140 UTC June 62018 LU216 m June 1 - 11MPEC
3.93 LD at 2345 UTC today2018 LR225 m June 5 - 14MPEC


Two small Solar-System bodies are known to be within ten lunar distances (LD) of Earth today. Nearest is 2018 EJ4, which moves in from 6.10 to 5.67 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 tomorrow 2018 EJ4 186 m  5.67 from 6.10 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  9.05 from 9.23 LD June 6 - 15 NHATS target - DOU
Approaching (sorted by 10-LD bubble entry date)
1.56 LD June 14 2018 LD1 18 m  11.59 from 14.04 LD tomorrow - June 18 risk - DOU
7.62 LD June 15 2018 LK 148 m  18.03 from 20.60 LD June 13 - 18 DOU

This report was generated at 2020 UTC with today's DOU MPEC posting follow-up for all four inbound or approaching objects, as you can see in the accompanying table. The DOU also has the recovery of recently departed (May 30th) 68347 2001 KB67 and follow-up for these departed objects: radar-observed 2017 VR12 (adding 83.74 days to its previous 126.76-day observing arc) and risk-listed objects 2018 LE1 and 2018 LM, plus the recovery of distant 2010 JO33 in April astrometry and March-April astrometry for distant 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. "Distant" is used here to describe objects that have come within ten LD since A/CC began these traffic reports (2007) but are not currently 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 9 June '18

The MPC's NEO Confirmation Page has 18 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, six were "one nighters." So far The Tracking News has counted a total of 27 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 9 June '18

Minor Planet Electronic Circulars

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


MPEC 2018-L46 - "22:55 UT" - 2018 LV2


MPEC 2018-L45 - "22:52 UT" - 2018 LU2


MPEC 2018-L44 - "22:49 UT" - 2018 LT2


MPEC 2018-L43 - "22:45 UT" - 2018 LS2


MPEC 2018-L42 - "21:53 UT" - 2018 LR2


MPEC 2018-L41 - "21:49 UT" - 2018 LQ2


MPEC 2018-L40 - "21:45 UT" - 2018 LP2


<< DOU on 9 June '18 >>  MPEC 2018-L39 - "12:03 UT" - Daily Orbit Update


MPEC 2018-L38 - "03:01 UT" - 2009 QG34


MPEC 2018-L37 - "00:18 UT" - Comet C/2018 L2 (ATLAS)

Observers  on 9 June '18

A total of 42 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-L37 -- C/2018 L2
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2018-L39 & 2018-L42 -- 2018 LR2, 2018 KP1, 2018 FF1, 2010 GC35, 208115, 143637
T08ATLAS Mauna Loa in Hawaii, 10 in MPECs 2018-L37 & 2018-L39 -- C/2018 L2, 2015 DP155, 68950, 68350, 68347, 516976, 467309, 450648, 15745, 1627
I47Auger Obs. in Argentina, 1 in MPEC 2018-L37 -- C/2018 L2
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2018-L39 -- 3552
X74Campo dos Amarais Obs., 1 in MPEC 2018-L37 -- C/2018 L2
703Catalina Sky Survey (CSS) in Arizona, 9 in MPECs 2018-L39, 2018-L41 & 2018-L42 -- 2018 LR2, 2018 LQ2, 2018 JS1, 2001 SC170, 37336, 153957, 138847, 3752, 1866
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPECs 2018-L39 & 2018-L44 -- 2018 LT2, 2015 PM
309$Enrique Solano in Spain via Cerro Paranal in Chile, 1 in MPEC 2018-L39 -- 177614
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 22 in MPECs 2018-L37, 2018-L38, 2018-L39, 2018-L40, 2018-L43 & 2018-L44 -- 2018 LT2, 2018 LS2, 2018 LP2, 2018 LM, 2018 LH, 2018 LB1, C/2018 L2, 2018 KW2, 2018 KP2, 2018 KO2, 2018 KC1, 2018 HT3, 2018 HH, 2018 GY4, 2018 GJ4, 2018 FQ5, 2018 FH5, 2017 YF5, 2017 XC62, 2017 WR13, 2017 VR12, 2009 QG34
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2018-L37 -- C/2018 L2
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPEC 2018-L39 -- 517103, 136839, 100004
006Fabra Obs. in Spain, 1 in MPEC 2018-L39 -- 66391
J95Great Shefford Obs. in England, 3 in MPECs 2018-L42, 2018-L45 & 2018-L46 -- 2018 LV2, 2018 LU2, 2018 LR2
238Grorudalen Obs. in Norway, 1 in MPEC 2018-L39 -- 1627
Q622Marian Urbanik in Slovakia via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-L37 -- C/2018 L2
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-L37 -- C/2018 L2
W85LCO Cerro Tololo A in Chile, 2 in MPEC 2018-L39 -- 2014 WG365, 2010 JO33
W87LCO Cerro Tololo C in Chile, 2 in MPEC 2018-L39 -- 2010 JO33, 2003 FY6
Q63LCO Siding Spring A in New South Wales, 2 in MPEC 2018-L39 -- 2010 JO33, 2003 FY6
K93LCO Sutherland C in South Africa, 1 in MPEC 2018-L39 -- 2014 WG365
K38M57 Obs. in Italy, 3 in MPEC 2018-L39 -- 68347, 66391, 139345
711McDonald Obs. in Texas, 1 in MPEC 2018-L41 -- 2018 LQ2
900Moriyama Obs. in Japan, 1 in MPEC 2018-L42 -- 2018 LR2
474Mt. John Obs. in New Zealand, 2 in MPECs 2018-L37 & 2018-L44 -- 2018 LT2, C/2018 L2
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2018-L39 & 2018-L46 -- 2018 LV2, 2018 KV, 68347, 504711, 439313, 271480, 164201, 15745
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-L45 -- 2018 LU2
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2018-L39, 2018-L40, 2018-L41, 2018-L43 & 2018-L44 -- 2018 LT2, 2018 LS2, 2018 LQ2, 2018 LP2, 2018 LE1, 2018 JV2, 2013 LX28, 364877, 719
K63Pascoli Obs. in Italy, 1 in MPEC 2018-L39 -- 2018 EJ4
A48Povegliano Veronese Obs. in Italy, 1 in MPEC 2018-L39 -- 2018 EJ4
H36Sandlot Obs. in Kansas, 3 in MPECs 2018-L41, 2018-L42 & 2018-L43 -- 2018 LS2, 2018 LR2, 2018 LQ2
645Sloan Digital Sky Survey (SDSS) in New Mexico, 5 in MPEC 2018-L39 -- 2014 JH78, 2008 VA15, 2008 GU20, 2006 UK217, 337228
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-L39 -- 2018 LK
W883B. Lutkenhoner in Germany via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-L37 -- C/2018 L2
Y00SONEAR in Brazil, 1 in MPEC 2018-L37 -- C/2018 L2
587Sormano Obs. in Italy, 1 in MPEC 2018-L45 -- 2018 LU2
691Spacewatch 0.9m telescope in Arizona, 11 in MPECs 2018-L39 & 2018-L40 -- 2018 LP2, 2018 LM, 2018 LF1, 2018 LE1, 2018 LD1, 2018 KT, 2018 EQ4, 2017 WS1, 2017 QP17, 2012 LF11, 253062
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2018-L38, 2018-L39, 2018-L40 & 2018-L43 -- 2018 LS2, 2018 LP2, 2018 GQ5, 2018 BJ5, 2017 LA, 2015 PM, 2013 RC21, 2013 LE7, 2009 QG34
W34Squirrel Valley Obs. in North Carolina, 3 in MPECs 2018-L39 & 2018-L45 -- 2018 LU2, 516976, 455550
I52Steward Obs. Mt. Lemmon Station in Arizona, 19 in MPECs 2018-L39, 2018-L40, 2018-L41, 2018-L42, 2018-L43, 2018-L45 & 2018-L46 -- 2018 LV2, 2018 LU2, 2018 LS2, 2018 LR2, 2018 LQ2, 2018 LP2, 2018 LM, 2018 LJ, 2018 LG1, 2018 LC1, 2018 KM2, 2018 KL2, 2018 KB1, 2018 JQ1, 2018 JE5, 2018 GL1, 2018 BL3, 2017 WS1, 518646
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-L39 -- 2018 JE
L01Visnjan Obs., 1 in MPEC 2018-L42 -- 2018 LR2
C51WISE in Earth polar orbit, 1 in MPEC 2018-L39 -- 415029
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 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 Sentry16002066-210263.1176989e-06-7.10-7.110JPL: Computed at 07:46 today Pacific time based on 27 observations spanning 3.7909 days (2018-Jun-05.39422 to 2018-Jun-09.18514). Diameter approximately 0.011 km. from weighted mean H=27.49.
NEODyS16002066-2118244.21e-06-6.95-7.2n/aNEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2018-06-05.395 to 2018-06-08.186."
2018 LD1JPL Sentry16002109-210911.409e-09-9.83-9.830JPL: Computed at 07:42 today Pacific time based on 24 observations spanning 3.8679 days (2018-Jun-05.34064 to 2018-Jun-09.20852). Diameter approximately 0.018 km. from weighted mean H=26.43.
NEODyS16002088-211247.09e-09-9.05-9.340NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2018-06-05.341 to 2018-06-08.196."
2018 LMJPL Sentry16002112-211624.955e-07-6.86-7.140JPL: Computed at 07:50 today Pacific time based on 59 observations spanning 4.9160 days (2018-Jun-04.25437 to 2018-Jun-09.17039). Diameter approximately 0.032 km. from weighted mean H=25.14.
NEODyS1600211616.34e-08-7.77-7.770NEODyS: "Based on 49 optical observations (of which 0 are rejected as outliers) from 2018-06-04.255 to 2018-06-08.205."

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 9 June '18

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

2306Grabbed MPEC 2018-L43 - 2018 LS2 - see above
Grabbed MPEC 2018-L44 - 2018 LT2 - see above
Grabbed MPEC 2018-L45 - 2018 LU2 - see above
Grabbed MPEC 2018-L46 - 2018 LV2 - see above
2202Grabbed MPEC 2018-L40 - 2018 LP2 - see above
Grabbed MPEC 2018-L41 - 2018 LQ2 - see above
Grabbed MPEC 2018-L42 - 2018 LR2 - see above
2020Generated Traffic Report
1600Noted that JPL Sentry has updated its 2018 LD1 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 updated its 2018 LM risk assessment - see above
Grabbed MPEC 2018-L39 - Daily Orbit Update - see above
0324Grabbed MPEC 2018-L38 - 2009 QG34 - see above
0231Grabbed MPEC 2018-L37 - Comet C/2018 L2 (ATLAS) - see above