Contents  on 16 July '18

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:

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 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.

<< DOU on 16 July '18 >>  MPEC 2018-O05 - "12:03 UT" - Daily Orbit Update

MPEC 2018-O04 - "10:16 UT" - 2018 NO4

MPEC 2018-O03 - "02:50 UT" - 2018 NN4

MPEC 2018-O02 - "02:44 UT" - 2018 NM4

MPEC 2018-O01 - "00:57 UT" - Comet C/2018 N2 (ASASSN)

Observers  on 16 July '18

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-O03 -- 2018 NN4
H21Astronomical 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
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2018-O03 -- 2018 NN4
R58Beverly-Begg Obs., 1 in MPEC 2018-O03 -- 2018 NN4
X74Campo 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
L29Drebach-South Obs., 1 in MPEC 2018-O03 -- 2018 NN4
734Farpoint Obs. in Kansas, 1 in MPEC 2018-O02 -- 2018 NM4
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-O05 -- 2018 NV2
K73Gravina Obs. in Italy, 4 in MPEC 2018-O05 -- 25916, 17274, 13553, 1627
J95Great Shefford Obs. in England, 4 in MPECs 2018-O02 & 2018-O05 -- 2018 NV2, 2018 NQ1, 2018 NM4, 2018 NF4
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-O01 -- C/2018 N2
Q620Ernesto 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
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2018-O01 -- C/2018 N2
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-O05 -- 31345
474Mt. 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
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-O05 -- 2018 LQ2
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2018-O02 & 2018-O04 -- 2018 NO4, 2018 NM4
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2018-O04 & 2018-O05 -- 2018 NO4, 2016 MK1
204Schiaparelli Obs. in Italy, 4 in MPEC 2018-O05 -- 2018 MK8, 2018 MJ7, 2018 MH7, 2004 LH
W88#program code "#" (12) via Chile Obs. in Chile, 1 in MPEC 2018-O03 -- 2018 NN4
Y00SONEAR in Brazil, 2 in MPECs 2018-O01 & 2018-O03 -- 2018 NN4, C/2018 N2
T12UH/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
L01Visnjan 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

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2308 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.





Notes for Today's Latest Risk Assessments
2018 NJJPL Sentry16002083-2117230.00189405923-4.35-4.360JPL: 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 MC5JPL Sentry1600R E M O V E DJPL: Risk listing removed at 1401 UTC today

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 16 July '18

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

1848Generated Traffic Report
1600Noted 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
1316Grabbed 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