Contents on 6 June '18
- Traffic Report -- four objects
- IAU Minor Planet Center
- NEOCP Activity -- 32 listings
- New MPECs -- five MPECs
- Observers -- 32 observers
- Impact Risk Monitoring -- one object
- Chronology
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page
Of 937 risk-listed objects, 50 have had news in the last 31 days. Updated at 2255 UTC on 6 June.
- Ephemerides for risk-listed objects & close passers
- News archive (old) & news image catalog (discontinued)
- Object Links - mainly for radar targets & close passers (mostly discontinued)
- Observing Campaigns (old)
The latest A/CC news is available via framed access, 
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 6 June '18
Four objects reported inside ten LD
There are four planetesimals known to be within ten lunar distances (LD) of our planet today. Nearest is 2018 EJ4, which is inbound from 8.69 to 7.67 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 |
| 2.14 LD June 1 | 2018 LB | 21 m | 8.41 to 10.01 LD | May 26 - today | NHATS target, exits ten LD, risk |
| 5.06 LD May 29 | 2018 LM | 34 m | 9.55 to 10.54 LD | May 22 - today | NEW, exits ten LD, risk - MPEC |
| 5.56 LD June 10 | 2018 EJ4 | 186 m | 7.67 from 8.69 LD | June 4 - 16 | radar/NHATS target - DOU |
| 8.96 LD June 11 | 2015 DP155 | 162 m | 9.90 from 10.35 LD | today - June 15 | NHATS target, enters ten LD - DOU |
| Approaching | |||||
| 7.62 LD June 15 | 2018 LK | 147 m | 25.90 from 28.60 LD | June 13 - 18 | NEW - MPEC |
This report was generated at 1851 UTC with the discoveries of three close-passers: approaching 2018 LK (MPEC) and outbound risk-listed 2018 LM (MPEC) -- see the above table for details, and departed 2018 LL (MPEC), which flew past us at 3.93 LD on May 31st. Today's DOU MPEC has follow-up for inbound 2018 EJ4 and 2015 DP155.
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. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.
NEOCP Activity on 6 June '18
The MPC's NEO Confirmation Page has 32 listings
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 32 objects listed. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 44 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 6 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-L13 time-stamped "01:29 UT" - 2018 LK - see below
- MPEC 2018-L14 time-stamped "10:23 UT" - 2018 LL - see below
- MPEC 2018-L15 time-stamped "10:26 UT" - 2018 LM - see below
- MPEC 2018-L16 time-stamped "10:33 UT" - 2018 LN - see below
- MPEC 2018-L17 time-stamped "12:02 UT" - Daily Orbit Update
<< DOU on 6 June '18 >> MPEC 2018-L17 - "12:02 UT" - Daily Orbit Update
- Observations of close-passing objects
- K18E04J 2018 EJ4 (arc=85 days, H=21.3 ~186m, NHATS target, radar support) from Dark Sky New Mexico Obs. (June 4.18-25p5), roving observer (June 4.90-91p5 & 5.88-89p5), and Steward Obs. Mt. Lemmon Station (June 6.39p4)
- K15DF5P 2015 DP155 (arc=2 opp, H=21.4 ~178m, NHATS target) from the Mt. Lemmon Survey (MLS) (June 5.38-39p4)
- Observation campaigns (NHATS targets, radar support)
- K18L00C 2018 LC (arc=4 days, H=25.4 ~28m, NHATS) from the Spacewatch 1.8m telescope (June 6.15-16p3) and Steward Mt. Lemmon Sta. (June 6.33-34p4)
- 05604 5604 1992 FE (radar) from ATLAS Haleakala (June 5.30-32p4)
-- NHATS target table -- Planetary radar schedules: Arecibo & Goldstone - Observations of small asteroids (H>22.0)
- K18L00G 2018 LG (arc=4 days, H=22.6 ~102m) from Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (June 5.02p3) and Steward Mt. Lemmon Sta. (June 6.28-30p3)
- K18K03C 2018 KC3 (arc=13 days, H=23.0 ~85m) from Steward Mt. Lemmon Sta. (June 6.41-42p4)
- K18J05C 2018 JC5 (arc=22 days, H=22.4 ~112m) from Holmes/CTIO (June 4.15-16p3)
- K18J02V 2018 JV2 (arc=24 days, H=23.6 ~65m) from Pan-STARRS 1 (PS1) (June 5.39-43p4)
- K18J01N 2018 JN1 (arc=27 days, H=22.3 ~117m) from Holmes/CTIO (June 4.08-09p4)
- K18H02H 2018 HH2 (arc=42 days, H=23.1 ~81m) from Holmes/CTIO (June 4.12-13p3 at G=22.5)
- K15J00P 2015 JP (arc=2 opp, H=22.8 ~93m) from Astronomical Research Obs. Westfield (June 5.27-29p2 at V=22.1-2)
- Observations of other objects
- K18L00N 2018 LN (arc=2 days, H=20.3 ~295m) from the Catalina Sky Survey (CSS) (June 6.36-37p3)
- K18L00J 2018 LJ (q=0.352 AU, Q=4.372 AU, arc=3 days, H=21.2 ~195m) from ATLAS Mauna Loa (June 5.44-47p4) and Steward Mt. Lemmon Sta. (June 6.27-28p4)
- K18K03D 2018 KD3 (arc=11 days, H=20.9 ~224m) from ARO Westfield (June 5.30-33p3)
- K18K02R 2018 KR2 (arc=16 days, H=19.1 ~513m) from Steward Mt. Lemmon Sta. (June 6.43p4)
- K18K02L 2018 KL2 (arc=16 days, H=21.7 ~155m) from Steward Mt. Lemmon Sta. (June 6.39-40p4)
- K18K00V 2018 KV (Q=4.391 AU, arc=54 days, H=17.1 ~1.29 km) from Steward Mt. Lemmon Sta. (June 6.42-43p4)
- K18J05E 2018 JE5 (arc=22 days, H=20.6 ~257m) from Steward Mt. Lemmon Sta. (June 6.42-43p3)
- K18J01S 2018 JS1 (Q=4.377 AU, arc=54 days, H=20.3 ~295m) from Steward Mt. Lemmon Sta. (June 6.42p4)
- K18J01Q 2018 JQ1 (arc=29 days, H=21.4 ~178m) from the Spacewatch 0.9m telescope (June 6.36-38p3)
- K18B06H 2018 BH6 (Q=4.207 AU, arc=131 days, H=18.4 ~708m) from Holmes/CTIO (June 5.02-03p2)
- K18B02Y 2018 BY2 (arc=154 days, H=20.5 ~269m) from Steward Mt. Lemmon Sta. (June 6.41-42p4)
- K17W14H 2017 WH14 (arc=2 opp, H=18.1 ~812m) from Steward Mt. Lemmon Sta. (June 6.42-43p4)
- K17S14B 2017 SB14 (arc=261 days, H=21.0 ~214m) from ARO Westfield (June 5.28-32p3 at V=22.3-5)
- K16J24J 2016 JJ24 (q=0.317 AU, arc=3 opp, H=19.9 ~355m) from ARO Westfield (June 5.27-30p2 at V=22.2-5)
- K16CQ4X 2016 CX264 (arc=2 opp, H=19.4 ~446m) from Spacewatch 0.9m (June 5.24-25p3)
- K15Q03M 2015 QM3 (q=0.331 AU, arc=2 opp, H=20.3 ~295m) from Spacewatch 1.8m (June 6.43-45p2)
- K04L00H 2004 LH (i=39.5°, arc=4 opp, H=18.8 ~589m) from ATLAS Haleakala (June 5.29-32p4)
- K01SH0C 2001 SC170 (arc=2 opp, H=20.5 ~269m) from Pan-STARRS 2 (PS2) (June 5.29-31p3)
- p8646 518646 2008 QD1 from PS1 (June 5.34-38p4)
- p8635 518635 2008 HO3 from ISON New Mexico Obs. (June 5.27-28p3)
- p6976 516976 2012 HM1 from PS1 (June 5.47-49p3)
- p4652 514652 2005 SC71 from PS2 (June 5.29-31p3)
- p3182 513182 2005 CV38 from MLS (June 5.23-25p4) and PS2 (June 5.29-32p3)
- o8796 508796 2000 KN44 from PS1 (June 5.39-43p3)
- o4711 504711 2009 SP171 from PS2 (June 5.37-40p3)
- l5967 475967 2007 JF22 from ATLAS Haleakala (June 5.36-38p4)
- l4574 474574 2004 FG1 from the Palomar Transient Factory (PTF) (June 4.27-30p2 & 5.27-35p4)
- k7309 467309 1996 AW1 from CSS (June 5.40-41p4)
- e8752 408752 1991 TB2 from ATLAS Haleakala (June 5.25-28p4)
- a3790 363790 2005 JE46 from PS1 (June 5.28-31p4)
- X7228 337228 2000 FL1 from MLS (June 5.20-22p4)
- R8327 278327 2007 HA59 from ATLAS Mauna Loa (June 5.28-31p4)
- O2708 242708 2005 UK1 from ATLAS Haleakala (June 5.55-57p3)
- O2643 242643 2005 NZ6 from ATLAS Haleakala (June 5.39-41p5)
- G2269 162269 1999 VO6 from MLS (June 5.44-45p4)
- E1484 141484 2002 DB4 from ATLAS Haleakala (June 5.25-28p4)
- D8847 138847 2000 VE62 from PTF (June 5.24-32p5), PS2 (June 5.31-32p3), and ATLAS Mauna Loa (June 5.39-42p5)
- 96189 96189 Pygmalion (1991 NT3) from ATLAS Haleakala (June 5.59-61p6)
- 88254 88254 2001 FM129 from PS1 (June 5.28-32p4)
- 85989 85989 1999 JD6 from ATLAS Mauna Loa (June 5.34-37p4)
- 85490 85490 1997 SE5 from PS1 (June 5.30-31p2)
- 68950 68950 2002 QF15 from Mulheim-Ruhr Obs. (June 5.98-05p3)
- 68348 68348 2001 LO7 from ATLAS Haleakala (June 5.30-31p4)
- 67367 67367 2000 LY27 from ATLAS Haleakala (June 5.49-50p3)
- 66391 66391 1999 KW4 from Grorudalen Obs. (June 4.95-97p3)
- 65674 65674 1988 SM from ATLAS Haleakala (June 5.30-33p4)
- 54686 54686 2001 DU8 from PTF (June 5.25-32p4)
- 36183 36183 1999 TX16 from PS1 (June 5.28-32p4)
- 25916 25916 2001 CP44 from CSS (June 5.42-45p4)
- 24761 24761 Ahau (1993 BW2) from PS1 (June 5.45-49p4)
- 17274 17274 2000 LC16 from ATLAS Haleakala (June 5.58-60p4)
- 15745 15745 Yuliya (1991 PM5) from PTF (June 3.25p1 & 5.29-38p5)
- 13553 13553 Masaakikoyama (1992 JE) from ATLAS Haleakala (June 5.57-59p3)
- 09856 9856 1991 EE from ATLAS Mauna Loa (June 5.27-30p4)
- 04257 4257 Ubasti (1987 QA) from PS2 (June 5.45-47p3)
- 03752 3752 Camillo (1985 PA) from ATLAS Mauna Loa (June 5.33-35p4)
- 01866 1866 Sisyphus (1972 XA) from MLS (June 5.16-17p4) and ATLAS Mauna Loa (June 5.28-34p11)
- 01685 1685 Toro (1948 OA) from ATLAS Haleakala (June 5.40-42p4)
- 01627 1627 Ivar (1929 SH) from ATLAS Haleakala (June 5.44-46p4)
- 00887 887 Alinda (1918 DB) from ATLAS Haleakala (June 5.48-50p4)
MPEC 2018-L16 - "10:33 UT" - 2018 LN
- K18L00N 2018 LN (H=20.3 ~295m) was picked up at 0935 UT on 4 June by PS2, observing it at June 4.40-43p4. This detection was confirmed by KLENOT (June 4.95p6), M57 Obs. (June 5.05-08p2), Sandlot Obs. (June 5.20-21p3 & 6.23-24p3), Wobblesock Obs. (June 5.40-41p3), Guidestar Obs. (June 5.92-93p3), program code "(" (17) via Slooh.com Canary Islands Obs. (June 5.94-95p3), Visnjan Obs. (June 5.99-00p3), Squirrel Valley Obs. (June 6.14-15p3), Spacewatch 0.9m (June 6.22-25p3), and Steward Mt. Lemmon Sta. (June 6.31-32p4).
MPEC 2018-L15 - "10:26 UT" - 2018 LM
- K18L00M 2018 LM (risk listed, Earth MOID=3.5 LD, H=25.0 ~34m, close passer) was picked up at 0606 UT on 4 June by CSS, observing it at June 4.25-27p3. This detection was confirmed by Steward Mt. Lemmon Sta. (June 4.30p4, 5.23p3 & 6.16p4), KLENOT (June 4.86p5), Visnjan Obs. (June 4.87p4), Sandlot Obs. (June 5.13-14p3), and Wobblesock Obs. (June 5.36-37p3).
MPEC 2018-L14 - "10:23 UT" - 2018 LL
- K18L00L 2018 LL (i=50.0°, Earth MOID=3.6 LD, H=24.7 ~39m) was picked up at 0627 UT on 3 June by MLS, observing it at June 3.27-29p3 and 4.35-36p2. This detection was confirmed by Steward Mt. Lemmon Sta. (June 3.33p3 at G=17.2-18.1 & 6.24-25p3 at G=21.8-22.3) and Visnjan Obs. (June 3.90-93p4).
MPEC 2018-L13 - "01:29 UT" - 2018 LK
- K18L00K 2018 LK (Earth MOID=0.1 LD, H=21.9 ~141m) was picked up at 1340 UT on 4 June by ATLAS Mauna Loa, observing it at June 4.57-59p4. This detection was confirmed by PS1 (April 16.58-61p4 at G=22.1-6), JAXA Space Tracking & Communications Center (JAXA STCC) (June 4.72p4), Visnjan Obs. (June 4.91-95p6), Guidestar Obs. (June 4.91-94p4), KLENOT (June 4.91-92p11), M57 Obs. (June 5.02-03p3), Tony Evans via Slooh.com Canary Islands Obs. (June 5.05p4), Tacande Obs. (June 5.06p3), SONEAR (June 5.14-18p9), Wobblesock Obs. (June 5.53-54p3), ROASTERR-1 (June 5.89-91p4), Northolt Branch Obs. (June 5.96-97p3), Great Shefford Obs. (June 5.99p3), and Olmen Obs. (June 6.01-02p9).
Observers on 6 June '18
A total of 32 observers appear in today's MPECs.
| Code | Observer / observatory |
|---|---|
| H21 | Astronomical Research Obs. Westfield in Illinois, 4 in MPEC 2018-L17 -- 2018 KD3, 2017 SB14, 2016 JJ24, 2015 JP |
| T05 | ATLAS Haleakala in Hawaii, 16 in MPEC 2018-L17 -- 2004 LH, 96189, 68348, 67367, 65674, 475967, 408752, 242708, 242643, 17274, 141484, 13553, 5604, 1685, 1627, 887 |
| T08 | ATLAS Mauna Loa in Hawaii, 8 in MPECs 2018-L13 & 2018-L17 -- 2018 LK, 2018 LJ, 85989, 278327, 138847, 9856, 3752, 1866 |
| 703 | Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2018-L15 & 2018-L17 -- 2018 LN, 2018 LM, 467309, 25916 |
| 807| | Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2018-L17 -- 2018 LG, 2018 JN1, 2018 JC5, 2018 HH2, 2018 BH6 |
| V16 | Dark Sky New Mexico Obs. in New Mexico, 1 in MPEC 2018-L17 -- 2018 EJ4 |
| J95 | Great Shefford Obs. in England, 1 in MPEC 2018-L13 -- 2018 LK |
| 238 | Grorudalen Obs. in Norway, 1 in MPEC 2018-L17 -- 66391 |
| A17 | Guidestar Obs. in Germany, 2 in MPECs 2018-L13 & 2018-L16 -- 2018 LN, 2018 LK |
| H15 | ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-L17 -- 518635 |
| P93 | JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-L13 -- 2018 LK |
| 246 | KLENOT in the Czech Republic, 3 in MPECs 2018-L13, 2018-L15 & 2018-L16 -- 2018 LN, 2018 LM, 2018 LK |
| K38 | M57 Obs. in Italy, 2 in MPECs 2018-L13 & 2018-L16 -- 2018 LN, 2018 LK |
| G96 | Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2018-L14 & 2018-L17 -- 2018 LL, 2015 DP155, 513182, 337228, 162269, 1866 |
| 628 | Mulheim-Ruhr Obs. in Germany, 1 in MPEC 2018-L17 -- 68950 |
| Z80 | Northolt Branch Obs. in England, 1 in MPEC 2018-L13 -- 2018 LK |
| C23 | Olmen Obs. in Belgium, 1 in MPEC 2018-L13 -- 2018 LK |
| I41 | Palomar Transient Factory (PTF) in southern California, 4 in MPEC 2018-L17 -- 54686, 474574, 15745, 138847 |
| F51 | Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2018-L13 & 2018-L17 -- 2018 LK, 2018 JV2, 88254, 85490, 518646, 516976, 508796, 363790, 36183, 24761 |
| F52 | Pan-STARRS 2 (PS2) in Hawaii, 7 in MPECs 2018-L16 & 2018-L17 -- 2018 LN, 2001 SC170, 514652, 513182, 504711, 138847, 4257 |
| L04 | ROASTERR-1 in Romania, 1 in MPEC 2018-L13 -- 2018 LK |
| 247 | roving observer, 1 in MPEC 2018-L17 -- 2018 EJ4 |
| H36 | Sandlot Obs. in Kansas, 2 in MPECs 2018-L15 & 2018-L16 -- 2018 LN, 2018 LM |
| G40( | program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-L16 -- 2018 LN |
| G403 | Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-L13 -- 2018 LK |
| Y00 | SONEAR in Brazil, 1 in MPEC 2018-L13 -- 2018 LK |
| 691 | Spacewatch 0.9m telescope in Arizona, 3 in MPECs 2018-L16 & 2018-L17 -- 2018 LN, 2018 JQ1, 2016 CX264 |
| 291 | Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2018-L17 -- 2018 LC, 2015 QM3 |
| W34 | Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-L16 -- 2018 LN |
| I52 | Steward Obs. Mt. Lemmon Station in Arizona, 15 in MPECs 2018-L14, 2018-L15, 2018-L16 & 2018-L17 -- 2018 LN, 2018 LM, 2018 LL, 2018 LJ, 2018 LG, 2018 LC, 2018 KV, 2018 KR2, 2018 KL2, 2018 KC3, 2018 JS1, 2018 JE5, 2018 EJ4, 2018 BY2, 2017 WH14 |
| J22 | Tacande Obs. in the Canary Islands, 1 in MPEC 2018-L13 -- 2018 LK |
| L01 | Visnjan Obs., 4 in MPECs 2018-L13, 2018-L14, 2018-L15 & 2018-L16 -- 2018 LN, 2018 LM, 2018 LL, 2018 LK |
| E08 | Wobblesock Obs. in New South Wales, 3 in MPECs 2018-L13, 2018-L15 & 2018-L16 -- 2018 LN, 2018 LM, 2018 LK |
| For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page. | |
Impact Risk Monitoring on 6 June '18
| 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 LM | JPL Sentry | 1602 | 2111-2111 | 1 | 2.092e-07 | -7.15 | -7.15 | 0 | JPL: Computed at 04:37 today Pacific time based on 29 observations spanning 1.9069 days (2018-Jun-04.25437 to 2018-Jun-06.16123). Diameter approximately 0.034 km. from weighted mean H=24.99. |
| NEODyS | 1602 | 2072-2116 | 6 | 2.77e-07 | -6.88 | -7.02 | 0 | NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2018-06-04.255 to 2018-06-06.162." | |
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 6 June '18
Times are UTC for when items were noted or added by The Tracking News.
| 1851 | Generated Traffic Report |
| 1602 | Noted that JPL Sentry has posted 2018 LM as an impact risk - see above Noted that NEODyS has posted 2018 LM as an impact risk - see above Grabbed MPEC 2018-L14 - 2018 LL - see above Grabbed MPEC 2018-L15 - 2018 LM - see above Grabbed MPEC 2018-L16 - 2018 LN - see above Grabbed MPEC 2018-L17 - Daily Orbit Update - see above |
| 0330 | Grabbed MPEC 2018-L13 - 2018 LK - see above |
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