Contents  on 22 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 22 July '18

Two objects reported inside ten LD

Two asteroidal objects are known to be within ten lunar distances (LD) of Earth today. The closest is 2018 OQ, which heads out from 5.74 to 6.83 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
1.40 LD July 17 2018 NM 18 m  7.29 to 8.76 LD July 10 - 23 NHATS target
3.72 LD July 18 2018 OQ 16 m  5.74 to 6.83 LD July 11 - 25 NHATS target - DOU
Approaching - sorted by 10-LD bubble entry date
9.36 LD Aug. 27 2018 LQ2 37 m  13.81 from 13.97 LD Aug. 17 - Sept. 6 NHATS target - DOU
4.22 LD Aug. 29 1998 SD9 49 m  102.03 from 98.63 LD Aug. 25 - Sept. 2

This report was generated at 2044 UTC with follow-up in today's DOU MPEC for approaching 2018 LQ2, outbound 2018 OQ, and departed risk-listed objects 2018 NL and 2018 JG1.

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 22 July '18

The MPC's NEO Confirmation Page has 12 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had twelve objects listed. Of these, seven were "one nighters."

New MPECs  on 22 July '18

Minor Planet Electronic Circulars

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

<< DOU on 22 July '18 >>  MPEC 2018-O36 - "12:03 UT" - Daily Orbit Update

MPEC 2018-O35 - "00:12 UT" - 2018 OT

Observers  on 22 July '18

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPECs 2018-O35 & 2018-O36 -- 2018 OT, 2018 OM, 2018 OG, 2018 NS1, 2018 NG4, 2018 LQ2, 2018 JQ1, 2018 JG2, 2017 MU8, 2016 RO1, 2013 YB38, 2010 VB72, 2006 SJ198, 490636, 363163, 162723
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2018-O36 -- 455550
T08ATLAS Mauna Loa in Hawaii, 3 in MPEC 2018-O36 -- 2015 RB82, 99799, 31345
U63Burnt Tree Hill Obs., 1 in MPEC 2018-O36 -- 144332
X74Campo dos Amarais Obs., 1 in MPEC 2018-O36 -- 4954
719Etscorn Obs. in New Mexico, 1 in MPEC 2018-O36 -- 283729
K83Forti Obs., 6 in MPEC 2018-O36 -- 2018 NB, 2011 GA62, 99799, 162168, 13553, 6456
157Frasso Sabino Obs. in Italy, 1 in MPEC 2018-O36 -- 2018 MM8
J95Great Shefford Obs. in England, 1 in MPEC 2018-O36 -- 2018 OQ
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-O36 -- 7350
U68JPL SynTrack Robotic Telescope, 1 in MPEC 2018-O36 -- 2018 OL
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-O36 -- 6456
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2018-O35 -- 2018 OT
0895N.V. Maigurova via Nikolaev Obs. in Ukraine, 7 in MPEC 2018-O36 -- 2018 NB, 2018 MR8, 2012 BV26, 2009 OG, 398188, 162483, 2061
C23Olmen Obs. in Belgium, 1 in MPEC 2018-O36 -- 2018 NB
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-O35 -- 2018 OT
204Schiaparelli Obs. in Italy, 2 in MPEC 2018-O36 -- 2018 NH2, 2018 NE1
G403Tony Evans in Portugal via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-O36 -- 2018 MM8
Q21Southern Utsunomiya in Japan, 1 in MPEC 2018-O36 -- 2018 NB
691Spacewatch 0.9m telescope in Arizona, 8 in MPEC 2018-O36 -- 2018 NY14, 2018 ME5, 2018 MD7, 2018 LO6, 2018 FS3, 2005 TG, 2001 QC96, 2001 HA4
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2018-O35 & 2018-O36 -- 2018 OT, 2018 OM, 2018 LQ2, 2018 KB1, 2018 JD5, 2015 RR150, 2008 RG98
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 5 in MPEC 2018-O36 -- 2018 OM, 2018 NL, 2018 MD7, 2018 LV5, 2018 JG1
C51WISE in Earth polar orbit, 1 in MPEC 2018-O36 -- 2015 XR128
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 July '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.





Notes for Today's Latest Risk Assessments
2018 OMNEODyS2200210011.55e-11-10.03-10.030NEODyS: "Based on 80 optical observations (of which 0 are rejected as outliers) from 2018-07-17.575 to 2018-07-22.333."
JPL Sentry1818R E M O V E DJPL: Risk listing removed at 1415 UTC today
2018 NLNEODyS22002057-2109274.68e-04-3.53-3.540NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2018-07-03.404 to 2018-07-19.562."
JPL Sentry18182060-210994.837695e-05-4.49-4.530JPL: Computed at 07:15 today Pacific time based on 24 observations spanning 16.158 days (2018-Jul-03.40294 to 2018-Jul-19.561388). Diameter approximately 0.030 km. from weighted mean H=25.28.
2018 JG1NEODyS22002068-209021.11e-09-8.89-9.190NEODyS: "Based on 90 optical observations (of which 0 are rejected as outliers) from 2018-05-08.180 to 2018-07-19.502."

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 22 July '18

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

2200Noted that NEODyS has updated its 2018 JG1 risk assessment - see above
Noted that NEODyS has updated its 2018 NL risk assessment - see above
Noted that NEODyS has updated its 2018 OM risk assessment - see above
2044Generated Traffic Report
1818Noted that JPL Sentry has updated its 2018 NL risk assessment - see above
Noted that JPL Sentry has removed 2018 OM as an impact risk - see above
Grabbed MPEC 2018-O36 - Daily Orbit Update - see above
0126Grabbed MPEC 2018-O35 - 2018 OT - see above