Contents on 16 July '18
- Traffic Report -- two objects
- IAU Minor Planet Center
- Observers -- 23 observers
- Impact Risk Monitoring -- two objects
NOTE: These A/CC news pages will update less often for an extended period. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP objects, and there may be some days without a traffic report for Earth's Busy Neighborhood.
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page
Of 951 risk-listed objects, 31 have had news in the last 31 days. Updated at 1600 UTC on 16 July.
- 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)
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 16 July '18
Two objects reported inside ten LD
There are two asteroidal objects reported inside ten lunar distances (LD) of our planet today. Closest is 2018 NM, which moves in from 2.31 to 1.44 LD within Earth's sphere of gravitational influence.
|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|
|0.30 LD July 7||2018 NX||10 m||6.24 to 6.97 LD||June 24 - July 21||intruder, NHATS target|
|1.40 LD tomorrow||2018 NM||18 m||1.44 from 2.31 LD||July 10 - 23||NHATS target, inside Earth SOI - DOU|
|Approaching - sorted by 10-LD bubble entry date|
|9.36 LD Aug. 27||2018 LQ2||37 m||14.76 from 14.91 LD||Aug. 17 - Sept. 6||NHATS target - DOU|
|4.22 LD Aug. 29||1998 SD9||49 m||120.48 from 124.49 LD||Aug. 25 - Sept. 2|
This report was generated at 1848 UTC with follow-up in today's DOU MPEC for approaching 2018 LQ2, inbound 2018 NM, and departed objects 2018 NH and risk-listed 2018 NJ.
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 16 July '18
The MPC's NEO Confirmation Page has 55 listings
When last checked at 2308 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 55 objects listed. Of these, 43 were "one nighters." So far The Tracking News has counted a total of 62 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 16 July '18
Minor Planet Electronic Circulars
As of last check at 2308 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2018-O01 time-stamped "00:57 UT" - Comet C/2018 N2 (ASASSN) - see below
- MPEC 2018-O02 time-stamped "02:44 UT" - 2018 NM4 - see below
- MPEC 2018-O03 time-stamped "02:50 UT" - 2018 NN4 - see below
- MPEC 2018-O04 time-stamped "10:16 UT" - 2018 NO4 - see below
- MPEC 2018-O05 time-stamped "12:03 UT" - Daily Orbit Update
- Observations of risk-listed objects
- K18N00J 2018 NJ (small asteroid, arc=10 days, H=27.9 ~9m, close passer, NHATS target) from UH/Tholen NEO Follow-Up 2.24m Telescope (July 15.61p1 at G=23.53)
- K18M05C 2018 MC5 (small asteroid, arc=33 days, H=25.1 ~32m, NHATS target) from Tholen 2.24m (July 12.62p3 at G=21.90-22.34, 13.60p1 at G=21.88 & 15.62p2 at G=22.08-72)
- Observations of recently (no longer) risk-listed objects
- K18M07H 2018 MH7 (small asteroid, arc=17 days, H=26.1 ~20m, NHATS target) from Schiaparelli Obs. (June 27.04-06p2)
- K18M07D 2018 MD7 (small asteroid, arc=24 days, H=22.6 ~102m, NHATS target) from Tholen 2.24m (July 15.63p2)
- Observations of close-passing objects
- K18N00M 2018 NM (arc=10 days, H=26.4 ~18m, NHATS target) from Mt. John Obs. (July 14.46p3)
- K18N00H 2018 NH (arc=9 days, H=24.7 ~39m) from Astronomical Research Obs. Westfield (July 12.24-28p3 at V=22.2-4)
- K18L02Q 2018 LQ2 (arc=40 days, H=24.8 ~37m, NHATS target) from the Palomar Transient Factory (PTF) (July 15.19-22p4)
- Observation campaigns (NHATS targets, radar support)
- K18N01Q 2018 NQ1 (arc=12 days, H=25.1 ~32m, NHATS) from Great Shefford Obs. (July 15.95-99p3)
- K18M05E 2018 ME5 (arc=33 days, H=22.8 ~93m, NHATS) from Tholen 2.24m (July 13.62p2)
-- NHATS target table
- Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
- K18N04F 2018 NF4 (arc=4 days, H=22.5 ~107m) from Great Shefford Obs. (July 16.02-03p3)
- K18N02V 2018 NV2 (arc=4 days, H=24.7 ~39m) from Farra d'Isonzo Obs. (July 13.86-87p3) and Great Shefford Obs. (July 15.92-94p4)
- K18N01W 2018 NW1 (arc=2 days, H=25.4 ~28m) from ARO Westfield (July 12.16-17p6)
- K18N01E 2018 NE1 (arc=6 days, H=23.2 ~78m) from Mt. John Obs. (July 14.54-55p4)
- K18M07J 2018 MJ7 (arc=15 days, H=23.1 ~81m) from Schiaparelli Obs. (June 30.99-04p3)
- K18M05F 2018 MF5 (arc=30 days, H=23.2 ~78m) from ARO Westfield (July 12.30-32p3 at V=22.1-2)
- K18N01T 2018 NT1 (arc=5 days, H=21.9 ~141m) from Tholen 2.24m (July 12.24p3)
- Observations of other objects
- K18N04B 2018 NB4 (arc=4 days, H=19.3 ~467m) from Mt. John Obs. (July 12.66-67p4)
- K18N02E 2018 NE2 (arc=6 days, H=20.7 ~245m) from ARO Westfield (July 14.21-24p3 at V=22.0-22.1)
- K18N01P 2018 NP1 (arc=5 days, H=20.9 ~224m) from Mt. John Obs. (July 14.59p3)
- K18N00N 2018 NN (arc=9 days, H=20.3 ~295m) from Mt. John Obs. (July 14.55-56p5)
- K18N00B 2018 NB (arc=92 days, H=19.4 ~446m) from ARO Westfield (July 11.32-33p5)
- K18M08K 2018 MK8 (Q=4.884 AU, arc=19 days, H=20.1 ~323m) from Schiaparelli Obs. (June 27.01-02p2)
- K18L06O 2018 LO6 (arc=32 days, H=20.4 ~282m) from Tholen 2.24m (July 13.62p2)
- K18J01Q 2018 JQ1 (arc=65 days, H=21.4 ~178m) from ARO Westfield (July 12.22-24p3 at V=22.0-22.1)
- K17G08B 2017 GB8 (arc=2 opp, H=19.8 ~371m) from Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (July 14.05-07p3 at V=22.0-22.1)
- K16O05P 2016 OP5 (arc=2 opp, H=20.7 ~245m) from Mt. John Obs. (July 14.43-44p3)
- K16M01K 2016 MK1 (arc=4 opp, H=19.1 ~513m) from San Marcello Pistoiese Obs. (July 15.96-98p3)
- K12X55C 2012 XC55 (arc=3 opp, H=19.3 ~467m) from ARO Westfield (July 14.26-30p3 at V=23.0-4)
- K04L00H 2004 LH (i=39.5°, arc=4 opp, H=18.8 ~589m) from Schiaparelli Obs. (June 26.88-90p3)
- X1471 331471 1984 QY1 from ARO Westfield (July 12.28-30p3 at V=22.1-3)
- 31345 31345 1998 PG from MASTER IAC Obs. (July 15.06p2 & 15.18p2)
- 25916 25916 2001 CP44 from Gravina Obs. (July 15.85-86p4)
- 17274 17274 2000 LC16 from Gravina Obs. (July 15.88-90p4)
- 13553 13553 Masaakikoyama (1992 JE) from Gravina Obs. (July 15.90-93p6)
- 01627 1627 Ivar (1929 SH) from Gravina Obs. (July 15.83-84p4)
MPEC 2018-O04 - "10:16 UT" - 2018 NO4
- K18N04O 2018 NO4 (H=20.7 ~245m) was picked up at 1242 UT on 12 July by Pan-STARRS 1 (PS1), observing it at June 11.52-54p3 and July 12.53-56p4. This detection was confirmed by Holmes/CTIO (July 14.32-33p3), San Marcello Pistoiese Obs. (July 16.05-07p2), and Visnjan Obs. (July 16.07p2).
MPEC 2018-O03 - "02:50 UT" - 2018 NN4
- K18N04N 2018 NN4 (Q=4.267 AU, H=18.2 ~776m) was picked up at 0608 UT on 12 July by ATLAS Mauna Loa, observing it at July 12.26-29p8. This detection was confirmed by Mt. John Obs. (July 12.39-40p4), Beverly-Begg Obs. (July 12.42-44p2 & 14.30-31p2), Arcadia Obs. (July 12.44-45p3 & 13.36-37p4), Drebach-South Obs. (July 12.76-77p3 & 12.85-86p9), Campo dos Amarais Obs. (July 12.94-95p3, 13.96-97p3 & 15.98-99p3), SONEAR (July 13.03p2), program code "#" (12) via Slooh.com Chile Obs. (July 13.03-06p2), and Holmes/CTIO (July 13.98p3).
MPEC 2018-O02 - "02:44 UT" - 2018 NM4
- K18N04M 2018 NM4 (H=20.4 ~282m) was picked up at 1344 UT on 11 July by PS1, observing it at July 11.57-60p4. This detection was confirmed by ARO Westfield (July 12.33-34p3), Farpoint Obs. (July 12.39-40p2), Visnjan Obs. (July 14.04p2), and Great Shefford Obs. (July 16.04-07p2).
MPEC 2018-O01 - "00:57 UT" - Comet C/2018 N2 (ASASSN)
- CK18N020* C/2018 N2 (ASASSN) (i=78.3°, q=3.005 AU, TP=2019 Oct. 4.09355 TT) was picked up at 0919 UT on 7 July by LCO Cerro Tololo C, observing it at July 7.39p3, 10.40p3, and 11.43p3. This detection was confirmed by iTelescope Obs. Siding Spring (July 14.72p2 & 14.77-81p5), B. Lutkenhoner via iTelescope Obs. Siding Spring (July 14.77-78p6), M. Suzuki via iTelescope Obs. Siding Spring (July 14.78p2), SONEAR (July 15.22-28p3), Campo dos Amarais Obs. (July 15.31-36p3), and Ernesto Guido via iTelescope Obs. Siding Spring (July 15.69-70p2).
Observers on 16 July '18
A total of 23 observers appear in today's MPECs.
|Code||Observer / observatory|
|E23||Arcadia Obs. in New South Wales, 1 in MPEC 2018-O03 -- 2018 NN4|
|H21||Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2018-O02 & 2018-O05 -- 2018 NW1, 2018 NM4, 2018 NH, 2018 NE2, 2018 NB, 2018 MF5, 2018 JQ1, 2012 XC55, 331471|
|T08||ATLAS Mauna Loa in Hawaii, 1 in MPEC 2018-O03 -- 2018 NN4|
|R58||Beverly-Begg Obs., 1 in MPEC 2018-O03 -- 2018 NN4|
|X74||Campo dos Amarais Obs., 2 in MPECs 2018-O01 & 2018-O03 -- 2018 NN4, C/2018 N2|
|807|||Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2018-O03, 2018-O04 & 2018-O05 -- 2018 NO4, 2018 NN4, 2017 GB8|
|L29||Drebach-South Obs., 1 in MPEC 2018-O03 -- 2018 NN4|
|734||Farpoint Obs. in Kansas, 1 in MPEC 2018-O02 -- 2018 NM4|
|595||Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-O05 -- 2018 NV2|
|K73||Gravina Obs. in Italy, 4 in MPEC 2018-O05 -- 25916, 17274, 13553, 1627|
|J95||Great Shefford Obs. in England, 4 in MPECs 2018-O02 & 2018-O05 -- 2018 NV2, 2018 NQ1, 2018 NM4, 2018 NF4|
|Q62||iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-O01 -- C/2018 N2|
|Q620||Ernesto Guido in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-O01 -- C/2018 N2|
|Q62?||B. Lutkenhoner in Germany via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-O01 -- C/2018 N2|
|Q62[||M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-O01 -- C/2018 N2|
|W87||LCO Cerro Tololo C in Chile, 1 in MPEC 2018-O01 -- C/2018 N2|
|Z22||MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-O05 -- 31345|
|474||Mt. John Obs. in New Zealand, 7 in MPECs 2018-O03 & 2018-O05 -- 2018 NP1, 2018 NN4, 2018 NN, 2018 NM, 2018 NE1, 2018 NB4, 2016 OP5|
|I41||Palomar Transient Factory in southern California, 1 in MPEC 2018-O05 -- 2018 LQ2|
|F51||Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2018-O02 & 2018-O04 -- 2018 NO4, 2018 NM4|
|104||San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2018-O04 & 2018-O05 -- 2018 NO4, 2016 MK1|
|204||Schiaparelli Obs. in Italy, 4 in MPEC 2018-O05 -- 2018 MK8, 2018 MJ7, 2018 MH7, 2004 LH|
|W88#||program code "#" (12) via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-O03 -- 2018 NN4|
|Y00||SONEAR in Brazil, 2 in MPECs 2018-O01 & 2018-O03 -- 2018 NN4, C/2018 N2|
|T12||UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 6 in MPEC 2018-O05 -- 2018 NT1, 2018 NJ, 2018 ME5, 2018 MD7, 2018 MC5, 2018 LO6|
|L01||Visnjan Obs., 2 in MPECs 2018-O02 & 2018-O04 -- 2018 NO4, 2018 NM4|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 16 July '18
Notes for Today's Latest Risk Assessments
|2018 NJ||JPL Sentry||1600||2083-2117||23||0.00189405923||-4.35||-4.36||0||JPL: Computed at 07:01 today Pacific time based on 32 observations spanning 10.336 days (2018-Jul-05.27485 to 2018-Jul-15.610845). Diameter approximately 0.009 km. from weighted mean H=27.79.|
|2018 MC5||JPL Sentry||1600||R E M O V E D||JPL: Risk listing removed at 1401 UTC today|
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 16 July '18
Times are UTC for when items were noted or added by The Tracking News.
|1848||Generated Traffic Report|
|1600||Noted that JPL Sentry has removed 2018 MC5 as an impact risk - see above|
Noted that JPL Sentry has updated its 2018 NJ risk assessment - see above
|1316||Grabbed MPEC 2018-O01 - Comet C/2018 N2 (ASASSN) - see above|
Grabbed MPEC 2018-O02 - 2018 NM4 - see above
Grabbed MPEC 2018-O03 - 2018 NN4 - see above
Grabbed MPEC 2018-O04 - 2018 NO4 - see above
Grabbed MPEC 2018-O05 - Daily Orbit Update - see above