Contents  on 30 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 30 August '18

Three objects reported inside ten LD

There are three minor planets reported inside ten lunar distances (LD) of our planet today. Nearest is 1998 SD9, which moves away from 4.53 to 5.85 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 yesterday 1998 SD9 49 m  4.53 to 5.85 LD Aug. 25 - Sept. 2 radar target - DOU
7.80 LD Aug. 23 2018 PU23 8 m  8.06 to 8.14 LD Aug. 7 - Sept. 13 NHATS target, risk
9.36 LD Aug. 27 2018 LQ2 37 m  9.39 to 9.42 LD Aug. 17 - Sept. 6 NHATS target - DOU
Approaching Traffic
8.50 LD Sept. 20 2017 SL16 23 m  30.77 from 32.14 LD Sept. 17 - 24 NHATS target

This report was generated at 2020 UTC with the recovery of outbound 1998 SD9 and follow-up for outbound 2018 LQ2 in today's DOU MPEC, along with the announcement of four discoveries that all entered Earth's sphere of gravitational influence but unfortunately had little observation and are now gone: Intruder 2018 QR1 passed Earth at 0.23 LD on August 21st. 2018 OF2 skimmed the Moon at perhaps 0.28 LD (and flew by Earth at 1.14 LD, uncertainty +/- 20 minutes) on July 24th, 2018 QS1 went by us at 1.17 LD on August 24th. And 2018 PV24, slipped by at about 1.2 LD on August 17th.

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 30 August '18

The MPC's NEO Confirmation Page has 3 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three objects listed. Of these, one was a "one nighter."

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 30 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.

MPEC 2018-Q99 - "19:35 UT" - 2017 ER22

MPEC 2018-Q98 - "19:33 UT" - 2016 GM206

<< DOU on 30 Aug. '18 >>  MPEC 2018-Q97 - "12:04 UT" - Daily Orbit Update

Observers  on 30 August '18

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPEC 2018-Q97 -- 2018 PZ24, 2018 PX24, 2018 PU24
X74Campo dos Amarais Obs., 1 in MPEC 2018-Q97 -- 99799
160Castelmartini Obs. in Italy, 14 in MPEC 2018-Q97 -- 2018 NB, 2015 AX16, 2011 GA62, 2002 OS4, 1999 VQ11, 1999 RB32, 65706, 481394, 457260, 418929, 414960, 21277, 137125, 2061
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-Q97 -- 2018 PA25
J95Great Shefford Obs. in England, 1 in MPEC 2018-Q97 -- 1998 SD9
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2018-Q97 -- 2014 DN112, 2009 ST103
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPEC 2018-Q97 -- 2018 PW24, 2018 PV24
C23Olmen Obs. in Belgium, 2 in MPEC 2018-Q97 -- 2011 UA, 2061
I41Palomar Transient Factory (PTF) in southern California, 4 in MPEC 2018-Q97 -- 2018 QS1, 2018 QR1, 2018 OF2, 2018 LQ2
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPEC 2018-Q97 -- 2018 PZ24, 2018 PX24, 2018 PW24, 2018 PV24, 2018 PU24, 2018 PA25
W25RMS Obs., 1 in MPEC 2018-Q97 -- 2018 LQ2
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-Q97 -- 1998 SD9
C95SATINO-1 in France, 1 in MPEC 2018-Q97 -- 2016 NF23
204Schiaparelli Obs. in Italy, 5 in MPEC 2018-Q97 -- 2018 FO5, 2017 YC8, 2009 XR2, 1998 SD9, 503960
Y00SONEAR in Brazil, 1 in MPEC 2018-Q97 -- 1627
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2018-Q97 -- 2018 PJ9, 2018 PH22
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPECs 2018-Q97, 2018-Q98 & 2018-Q99 -- 2017 ER22, 2016 GM206, 446924
G33Wickede Obs. in Germany, 1 in MPEC 2018-Q97 -- 2061
C51WISE in Earth polar orbit, 5 in MPEC 2018-Q97 -- 2018 ML8, 2009 QJ9, 53789, 518463, 308899
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 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 PA25JPL Sentry17332029-2118152.58464e-08-7.18-7.390JPL: Computed at 08:40 today Pacific time based on 6 observations spanning .75458 days (2018-Aug-14.35374 to 2018-Aug-15.10832). Diameter approximately 0.036 km. from weighted mean H=24.88.

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 30 August '18

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

2020Generated Traffic Report
2001Grabbed MPEC 2018-Q98 - 2016 GM206 - see above
Grabbed MPEC 2018-Q99 - 2017 ER22 - see above
1733Noted that JPL Sentry has posted 2018 PA25 as an impact risk - see above
1430Grabbed MPEC 2018-Q97 - Daily Orbit Update - see above