Contents  on 26 August '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 26 August '18

Four objects reported inside ten LD

Four minor planets are reported moving within ten lunar distances (LD) of our planet today, all of them out beyond six LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
2.80 LD Aug. 20 2018 QE 9 m  6.46 to 7.37 LD Aug. 10 - 29 NHATS target, risk
4.22 LD Aug. 29 1998 SD9 49 m  6.97 from 9.00 LD yesterday - Sept. 2
7.80 LD Aug. 23 2018 PU23 8 m  7.83 to 7.87 LD Aug. 7 - Sept. 13 NHATS target, risk
9.36 LD tomorrow 2018 LQ2 37 m  9.36 from 9.38 LD Aug. 17 - Sept. 6 NHATS target
Approaching Traffic
8.50 LD Sept. 20 2017 SL16 23 m  36.28 from 37.67 LD Sept. 17 - 24 NEW, NHATS target

This report was generated at 1944 UTC with follow-up in today's DOU MPEC for departed risk-listed 2018 PJ20. Today we have added approaching 2017 SL16 to this reporting. It won't come into view for ground-based optical telescopes until near mid-September. And we would like to highlight departed 2018 PN22, which has only been reported observed over 2.42 days ending August 16th. It is calculated by JPL to have also come inside ten LD unobserved last year and in 2015, 2014, and 2010. It may still be viewable from larger telescopes after the bright Moon gets out of the way, but the uncertainty in its predicted position is growing.

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 26 August '18

The MPC's NEO Confirmation Page has 23 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 23 objects listed. Of these, five were "one nighters."

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 26 August '18

Minor Planet Electronic Circulars

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

<< DOU on 26 Aug. '18 >>  MPEC 2018-Q72 - "12:05 UT" - Daily Orbit Update

Observers  on 26 August '18

Eleven observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPEC 2018-Q72 -- 2018 QA1, 2018 PX7, 2018 PV10, 2018 PU7, 2018 PM23, 2018 PK21, 2018 PJ22, 2018 PC, 2018 PB22, 2018 NN4, 2018 MR8, 2018 MM8, 2018 KE3, 2018 FO5
160Castelmartini Obs. in Italy, 8 in MPEC 2018-Q72 -- 2018 PW7, 2018 PJ10, 2013 EP41, 2011 GA62, 87311, 418929, 414960, 140039
J95Great Shefford Obs. in England, 1 in MPEC 2018-Q72 -- 2018 PW7
Z22MASTER IAC Obs. in the Canary Islands, 2 in MPEC 2018-Q72 -- 2061, 433
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-Q72 -- 86324
I41Palomar Transient Factory (PTF) in southern California, 4 in MPEC 2018-Q72 -- 2001 SC170, 65996, 53789, 283729
323Perth Obs. in Western Australia, 1 in MPEC 2018-Q72 -- 2018 PK22
C95SATINO-1 in France, 1 in MPEC 2018-Q72 -- 2009 QJ9
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-Q72 -- 86324
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-Q72 -- 2018 PP10, 2018 PJ20
C51WISE in Earth polar orbit, 3 in MPEC 2018-Q72 -- 2018 QE1, 2018 ML8, 86324
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 August '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 QJ1NEODyS17012068-210853.38e-08-7.97-8.210NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2018-08-21.528 to 2018-08-23.339."
2018 PJ20NEODyS1701209321.08e-07-8.27-8.470NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2018-08-08.403 to 2018-08-18.373."

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 26 August '18

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

1944Generated Traffic Report
1701Noted that NEODyS has updated its 2018 PJ20 risk assessment - see above
Noted that NEODyS has posted 2018 QJ1 as an impact risk - see above
1600Grabbed MPEC 2018-Q72 - Daily Orbit Update - see above