Contents  on 31 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 31 August '18

Three objects reported inside ten LD

Three transient natural objects are reported within ten lunar distances (LD) of Earth today. The nearest is 1998 SD9, which moves outward from 5.85 to 7.71 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  5.85 to 7.71 LD Aug. 25 - Sept. 2 radar target - DOU
7.80 LD Aug. 23 2018 PU23 8 m  8.14 to 8.24 LD Aug. 7 - Sept. 13 NHATS target, risk
9.36 LD Aug. 27 2018 LQ2 37 m  9.42 to 9.47 LD Aug. 17 - Sept. 6 NHATS target - DOU
Approaching Traffic
8.50 LD Sept. 20 2017 SL16 23 m  29.42 from 30.77 LD Sept. 17 - 24 NHATS target

This report was generated at 1740 UTC with first follow-up for departed risk-listed 2018 QS (8.98 days added to 3.82-day discovery arc) in today's DOU MPEC, along with continuing follow-up for outbound objects 2018 LQ2 and 1998 SD9.


<< Reading:  The Applied Physics Lab at John Hopkins University has news items about two of its NASA space missions. One announces that the New Horizons spacecraft has spotted its next destination, KBO 486958 2014 MU69. And the other reports that NASA has given the go-ahead to enter the "the final design and assembly phase" for the Double Asteroid Redirection Test (DART) spacecraft, which will attempt to impact and slightly alter the orbit of the moonlet circling PHA 65803 Didymos (1996 GT).



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 31 August '18

The MPC's NEO Confirmation Page has 5 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of ten 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 31 August '18

Minor Planet Electronic Circulars

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


<< DOU on 31 Aug. '18 >>  MPEC 2018-Q102 - "12:04 UT" - Daily Orbit Update


MPEC 2018-Q101 - "05:43 UT" - 2018 QU1


MPEC 2018-Q100 - "05:39 UT" - 2018 QT1

Observers  on 31 August '18

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 3 in MPEC 2018-Q102 -- 86324, 17274, 719
T05ATLAS Haleakala in Hawaii, 9 in MPEC 2018-Q102 -- 2015 FP118, 2012 OD1, 66008, 455550, 413563, 16834, 144332, 115052, 3552
T08ATLAS Mauna Loa in Hawaii, 21 in MPECs 2018-Q101 & 2018-Q102 -- 2018 QU1, 2018 NB, 2018 KE3, 2015 RJ83, 2013 EP41, 2009 QJ9, 1998 SD9, 86324, 438429, 31345, 18109, 17511, 17274, 162168, 137125, 13553, 8201, 6456, 5786, 4183, 719
V03Big Water Obs. in Utah, 2 in MPECs 2018-Q100 & 2018-Q102 -- 2018 QT1, 1998 SD9
X74Campo dos Amarais Obs., 1 in MPEC 2018-Q102 -- 3753
160Castelmartini Obs. in Italy, 6 in MPEC 2018-Q102 -- 2009 QJ9, 2002 OS4, 86324, 68950, 518635, 283729
J95Great Shefford Obs. in England, 2 in MPECs 2018-Q100 & 2018-Q102 -- 2018 QT1, 1998 SD9
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 2 in MPECs 2018-Q100 & 2018-Q102 -- 2018 QT1, 2018 LQ2
585Kiev Comet Station in Ukraine, 1 in MPEC 2018-Q101 -- 2018 QU1
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 10 in MPEC 2018-Q102 -- 2018 PL23, 2018 PB20, 2018 LU3, 2018 LL2, 2015 UC67, 2014 OL339, 2013 YB38, 2013 FW13, 2011 WO4, 2009 UE2
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-Q102 -- 418929
C41MASTER-II Kislovodsk in Russia, 2 in MPEC 2018-Q102 -- 16960, 162168
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-Q102 -- 1998 SD9
I41Palomar Transient Factory (PTF) in southern California, 5 in MPEC 2018-Q102 -- 2002 OS4, 1998 SD9, 283729, 162168, 138847
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-Q101 -- 2018 QU1
K63Pascoli Obs. in Italy, 2 in MPECs 2018-Q101 & 2018-Q102 -- 2018 QU1, 2018 LQ2
H36Sandlot Obs. in Kansas, 4 in MPECs 2018-Q100, 2018-Q101 & 2018-Q102 -- 2018 QU1, 2018 QT1, 2018 PS7, 1998 SD9
C95SATINO-1 in France, 1 in MPEC 2018-Q102 -- 2018 KE3
691Spacewatch 0.9m telescope in Arizona, 18 in MPEC 2018-Q102 -- 2018 QT, 2018 PX23, 2018 PX19, 2018 PS7, 2018 PS23, 2018 PL9, 2018 PK24, 2018 PK22, 2018 PK21, 2018 PH9, 2018 PH22, 2018 NN4, 2018 KG1, 2018 JC3, 2018 FS3, 2010 AK, 2005 YW93, 2003 RC2
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2018-Q100 & 2018-Q102 -- 2018 QT1, 2018 QS, 2018 QQ, 2018 PQ23, 2018 PG21, 2018 PF8, 2018 LQ2, 2007 ML24, 2005 GJ8
W34Squirrel Valley Obs. in North Carolina, 3 in MPECs 2018-Q101 & 2018-Q102 -- 2018 QU1, 283729, 115052
I52Steward Obs. Mt. Lemmon Station in Arizona, 13 in MPEC 2018-Q102 -- 2018 QU1, 2018 QT1, 2018 PV10, 2018 PS7, 2018 PK22, 2018 PH9, 2018 PG9, 2018 PE22, 2018 PA20, 2018 NS1, 2018 NO1, 2018 NN, 2017 YE5
B18Terskol Obs. in Russia, 1 in MPEC 2018-Q102 -- 2015 FP118
Z52The Studios Obs., 1 in MPEC 2018-Q102 -- 13553
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-Q102 -- 363027
C51WISE in Earth polar orbit, 1 in MPEC 2018-Q100 -- 2018 QT1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2018 QSJPL Sentry15092084-211631.2439e-06-6.69-6.760JPL: Computed at 07:31 today Pacific time based on 50 observations spanning 12.794 days (2018-Aug-18.47984 to 2018-Aug-31.27401). Diameter approximately 0.020 km. from weighted mean H=26.15.
2018 PA25NEODyS14302026-2116331.75e-08-7.40-7.950NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2018-08-14.355 to 2018-08-15.109."
2018 PV24NEODyS1430210426.44e-08-9.88-9.910NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2018-08-11.447 to 2018-08-12.384."
2018 PG21JPL Sentry1430R E M O V E DJPL: Risk listing removed at 1427 UTC today
2018 OF2NEODyS1430204311.9e-10-9.88-9.880NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2018-07-23.171 to 2018-07-23.346."
2008 EM68JPL Sentry14302018-211611081.32511133e-05-5.18-5.470JPL: Computed at 00:27 April 7th of 2017 Pacific time based on 12 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183). Diameter approximately 0.010 km. from weighted mean H=27.72.

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 31 August '18

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

1740Generated Traffic Report
1509Noted that JPL Sentry has updated its 2018 QS risk assessment - see above
1430Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
Noted that NEODyS has posted 2018 OF2 as an impact risk - see above
Noted that NEODyS has posted 2018 PA25 as an impact risk - see above
Noted that JPL Sentry has removed 2018 PG21 as an impact risk - see above
Noted that NEODyS has posted 2018 PV24 as an impact risk - see above
Grabbed MPEC 2018-Q100 - 2018 QT1 - see above
Grabbed MPEC 2018-Q101 - 2018 QU1 - see above
Grabbed MPEC 2018-Q102 - Daily Orbit Update - see above