Contents  on 2 September '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 2 September '18

Three objects reported inside ten LD

Three minor planets are reported inside ten lunar distances (LD) of Earth today. Closest of these is risk-listed 2018 PU23, which slips away from 8.34 to 8.46 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
4.21 LD Aug. 29 1998 SD9 49 m  9.81 to 12.02 LD Aug. 25 - today exits ten LD, radar target
7.80 LD Aug. 23 2018 PU23 8 m  8.34 to 8.46 LD Aug. 7 - Sept. 13 NHATS target, risk
9.36 LD Aug. 27 2018 LQ2 37 m  9.54 to 9.61 LD Aug. 17 - Sept. 6 NHATS target - DOU
Approaching Traffic
8.50 LD Sept. 20 2017 SL16 23 m  26.73 from 28.07 LD Sept. 17 - 24 NHATS target

This report was generated at 1914 UTC with follow-up in today's DOU MPEC for 2018 LQ2 plus astrometry from early August for 1999 FN19.

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 2 September '18

The MPC's NEO Confirmation Page has 9 listings

When last checked at 2351 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of eleven 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 2 September '18

Minor Planet Electronic Circulars

As of last check at 2347 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 2 Sept. '18 >>  MPEC 2018-R05 - "12:04 UT" - Daily Orbit Update

Observers  on 2 September '18

A total of 20 observers appear in today's MPEC.

CodeObserver / observatory
C97Al-Fulaij Obs., 1 in MPEC 2018-R05 -- 144332
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2018-R05 -- 2018 QU1, 2018 QT, 2018 QP, 2018 PX7, 2018 PJ22, 2018 NO4, 2018 NB, 2018 MM8, 2018 LQ2, 2018 KE3
T05ATLAS Haleakala in Hawaii, 22 in MPEC 2018-R05 -- 2013 EP41, 2009 QJ9, 2008 RT26, 86324, 376788, 31345, 277616, 267729, 21277, 18109, 17511, 17274, 162168, 140039, 137125, 13553, 12711, 8201, 6456, 5786, 5653, 719
T08ATLAS Mauna Loa in Hawaii, 5 in MPEC 2018-R05 -- 66008, 455550, 413563, 144332, 115052
160Castelmartini Obs. in Italy, 12 in MPEC 2018-R05 -- 2018 LQ2, 2018 KE3, 2015 RJ83, 2015 AX16, 2013 EP41, 2011 GA62, 2005 RB, 2001 SC170, 481394, 418929, 414960, 162168
703Catalina Sky Survey (CSS) in Arizona, 18 in MPEC 2018-R05 -- 2018 QU1, 2018 KE3, 2015 RJ83, 2013 EP41, 2012 UV27, 2007 RX19, 2005 RB, 2001 SC170, 418929, 267729, 17511, 163818, 162168, 140039, 13553, 6456, 5786, 1865
970Chelmsford Obs. in England, 1 in MPEC 2018-R05 -- 2015 FP118
J95Great Shefford Obs. in England, 1 in MPEC 2018-R05 -- 2018 QU1
A17Guidestar Obs. in Germany, 1 in MPEC 2018-R05 -- 2018 LQ2
H15ISON New Mexico Obs. in New Mexico, 2 in MPEC 2018-R05 -- 87311, 4183
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2018-R05 -- 17274
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-R05 -- 2015 FP118, 162168, 144332
C23Olmen Obs. in Belgium, 2 in MPEC 2018-R05 -- 2011 UA, 2061
I41Palomar Transient Factory (PTF) in southern California, 4 in MPEC 2018-R05 -- 2018 QT, 2018 NN4, 283729, 5751
H36Sandlot Obs. in Kansas, 3 in MPEC 2018-R05 -- 2018 QT, 2018 PK24, 2018 NO4
C95SATINO-1 in France, 1 in MPEC 2018-R05 -- 2011 UA
G40!M. Kumrucu-Lohmiller in Massachusetts via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-R05 -- 2018 LQ2
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2018-R05 -- 2018 QT1, 2018 NN4, 2015 JY1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-R05 -- 2018 KG1, 1999 FN19
I15Wishing Star Obs. in Rhode Island, 1 in MPEC 2018-R05 -- 86324
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 September '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2352 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 QSNEODyS22122084-211621.45e-06-6.63-6.70NEODyS: "Based on 50 optical observations (of which 0 are rejected as outliers) from 2018-08-18.481 to 2018-08-31.275."
2018 PG21NEODyS2212R E M O V E D-

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 2 September '18

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

2212Noted that NEODyS has removed 2018 PG21 as an impact risk - see above
Noted that NEODyS has updated its 2018 QS risk assessment - see above
1914Generated Traffic Report
1700Grabbed MPEC 2018-R05 - Daily Orbit Update - see above