Contents  on 25 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 25 August '18

Four objects reported inside ten LD

There are four Solar-System small bodies reported inside ten lunar distances (LD) of Earth today. Nearest is risk-listed 2018 QE, which is outbound from 5.59 to 6.46 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
2.80 LD Aug. 20 2018 QE 9 m  5.59 to 6.46 LD Aug. 10 - 29 NHATS target, risk
4.22 LD Aug. 29 1998 SD9 49 m  9.00 from 11.18 LD today - Sept. 2 enters ten LD, radar target
7.80 LD Aug. 23 2018 PU23 8 m  7.81 to 7.83 LD Aug. 7 - Sept. 13 NHATS target, risk
9.36 LD Aug. 27 2018 LQ2 37 m  9.38 from 9.41 LD Aug. 17 - Sept. 6 NHATS target

This report was generated at 2010 UTC with the discovery of departed risk-listed 2018 QJ1 (MPEC), which flew past us at roughly 8.2 LD on August 5th, and with follow-up in today's DOU MPEC for departed 2018 QZ plus photometry from early July for risk-listed 2018 NJ.

<< Reading:  It has been announced that NASA's OSIRIS-REx spacecraft has photographed its destination, risk-listed 101955 Bennu (1999 RQ36).
        Waseda University has a news item about finding silica mineral quartz in an Antarctic meteorite, for the first time providing "direct evidence of silica condensation within the solar protoplanetary disk and coming a step closer to understanding solar formation and evolution."

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 25 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." So far The Tracking News has counted a total of 31 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 25 August '18

Minor Planet Electronic Circulars

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

MPEC 2018-Q71 - "18:01 UT" - 2018 QJ1

MPEC 2018-Q70 - "17:57 UT" - 2018 QH1

MPEC 2018-Q69 - "13:52 UT" - 2001 PU9

<< DOU on 25 Aug. '18 >>  MPEC 2018-Q68 - "12:04 UT" - Daily Orbit Update

Observers  on 25 August '18

Thirteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2018-Q71 -- 2018 QJ1
160Castelmartini Obs. in Italy, 8 in MPEC 2018-Q68 -- 2018 NN4, 2015 OH, 2002 OS4, 86324, 438429, 283729, 18882, 719
J95Great Shefford Obs. in England, 5 in MPECs 2018-Q68 & 2018-Q70 -- 2018 QZ, 2018 QW, 2018 QT, 2018 QH1, 2018 QF1
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2018-Q68 -- 13553
C41MASTER-II Kislovodsk in Russia, 1 in MPEC 2018-Q68 -- 16960
Z80Northolt Branch Obs. in England, 2 in MPEC 2018-Q68 -- 2016 NF23, 17274
I41Palomar Transient Factory (PTF) in southern California, 2 in MPEC 2018-Q68 -- 2015 AX16, 250162
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2018-Q70 & 2018-Q71 -- 2018 QJ1, 2018 QH1
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-Q70 -- 2018 QH1
C95SATINO-1 in France, 1 in MPEC 2018-Q68 -- 2005 RB
204Schiaparelli Obs. in Italy, 10 in MPEC 2018-Q68 -- 2018 NJ, 2018 NB, 2018 NA, 2018 LP5, 2015 RB82, 2015 MQ101, 2014 NE3, 2011 GA62, 2007 NL1, 2004 RX10
L01Visnjan Obs., 2 in MPECs 2018-Q70 & 2018-Q71 -- 2018 QJ1, 2018 QH1
C51WISE in Earth polar orbit, 4 in MPECs 2018-Q68 & 2018-Q69 -- 2018 QE1, 2001 PU9, 88263, 9856
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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 QJ1JPL Sentry19442100-210012.255e-09-9.08-9.080JPL: Computed at 11:57 today Pacific time based on 10 observations spanning 1.8112 days (2018-Aug-21.52737 to 2018-Aug-23.338565). Diameter approximately 0.029 km. from weighted mean H=25.33.
2018 QTJPL Sentry1530R E M O V E DJPL: Risk listing removed at 1435 UTC today
NEODyS1530R E M O V E D-
2018 NJJPL Sentry15302083-2116170.00158414857-4.45-4.450JPL: Computed at 07:36 today Pacific time based on 38 observations spanning 36.078 days (2018-Jul-05.27485 to 2018-Aug-10.352776). Diameter approximately 0.009 km. from weighted mean H=27.82.
NEODyS15302083-2118432.5e-03-4.27-4.87-NEODyS: "Based on 38 optical observations (of which 1 are rejected as outliers) from 2018-07-05.276 to 2018-08-10.354."

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 25 August '18

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

2010Generated Traffic Report
1944Noted that JPL Sentry has posted 2018 QJ1 as an impact risk - see above
1824Grabbed MPEC 2018-Q71 - 2018 QJ1 - see above
1801Grabbed MPEC 2018-Q70 - 2018 QH1 - see above
1530Noted that JPL Sentry has updated its 2018 NJ risk assessment - see above
Noted that NEODyS has updated its 2018 NJ risk assessment - see above
Noted that JPL Sentry has removed 2018 QT as an impact risk - see above
Noted that NEODyS has removed 2018 QT as an impact risk - see above
Grabbed MPEC 2018-Q68 - Daily Orbit Update - see above
Grabbed MPEC 2018-Q69 - 2001 PU9 - see above