Contents  on 3 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 3 September '18

Three objects reported inside ten LD

Three Solar-System small bodies are reported less than ten lunar distances (LD) from our home world today. Nearest is newly announced 2018 RA, outbound from 3.93 to 5.06 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
3.03 LD Sept. 1 2018 RA 15 m  3.93 to 5.06 LD Aug. 26 - Sept. 7 NEW - MPEC
7.80 LD Aug. 23 2018 PU23 8 m  8.46 to 8.58 LD Aug. 7 - Sept. 13 NHATS target, risk
9.36 LD Aug. 27 2018 LQ2 37 m  9.61 to 9.71 LD Aug. 17 - Sept. 6 NHATS target - DOU
Approaching Traffic
8.50 LD Sept. 20 2017 SL16 23 m  25.40 from 26.73 LD Sept. 17 - 24 NHATS target

This report was generated at 1744 UTC with the discovery of outbound 2018 RA (MPEC), and with first follow-up in today's DOU MPEC for departed objects 2018 PP9 (23.30 days added to 2.55-day discovery arc) and 2018 QJ1 (9.96 days added to 1.81), along with continuing follow-up for outbound 2018 LQ2 and departed objects 2018 QS and 1998 SD9.

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 3 September '18

The MPC's NEO Confirmation Page has 8 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eight objects listed. Of these, six 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 3 September '18

Minor Planet Electronic Circulars

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

MPEC 2018-R10 - "21:11 UT" - 2015 BW92

MPEC 2018-R09 - "21:09 UT" - 2014 TW32

<< DOU on 3 Sept. '18 >>  MPEC 2018-R08 - "12:11 UT" - Daily Orbit Update

MPEC 2018-R07 - "04:30 UT" - 2018 RA

MPEC 2018-R06 - "04:24 UT" - 2018 QV1

Observers  on 3 September '18

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2018-R06, 2018-R07 & 2018-R08 -- 2018 RA, 2018 QV1, 2018 QS, 2018 PZ23, 2013 TS132, 2010 WP8, 2006 TH7, 369296, 1221
T05ATLAS Haleakala in Hawaii, 2 in MPECs 2018-R06 & 2018-R08 -- 2018 QV1, 1999 RB32
V03Big Water Obs. in Utah, 1 in MPEC 2018-R07 -- 2018 RA
U63Burnt Tree Hill Obs., 1 in MPEC 2018-R08 -- 2018 LQ2
160Castelmartini Obs. in Italy, 12 in MPEC 2018-R08 -- 2018 NN4, 2015 OH, 2013 EP41, 2011 GA62, 2002 OS4, 2001 SC170, 87311, 418929, 415029, 18882, 138847, 719
703Catalina Sky Survey in Arizona, 1 in MPEC 2018-R07 -- 2018 RA
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-R07 -- 2018 RA
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 26 in MPECs 2018-R08, 2018-R09 & 2018-R10 -- 2018 QY, 2018 QJ1, 2018 PT21, 2018 PP9, 2018 PP23, 2018 PP10, 2018 PL20, 2018 PC20, 2018 NU1, 2018 NT1, 2018 ME7, 2018 LS15, 2018 LM5, 2018 LG5, 2018 LD16, 2018 LC3, 2018 LB1, 2018 LA16, 2018 JL, 2018 GQ2, 2018 FY1, 2018 FQ5, 2018 FE5, 2016 XD1, 2015 BW92, 2014 TW32
970Chelmsford Obs. in England, 1 in MPEC 2018-R08 -- 2015 FP118
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2018-R07 & 2018-R08 -- 2018 RA, 2018 QU1, 2015 FP118
J95Great Shefford Obs. in England, 3 in MPECs 2018-R06, 2018-R07 & 2018-R08 -- 2018 RA, 2018 QV1, 1998 SD9
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-R08 -- 1998 SD9
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-R06 -- 2018 QV1
950.EURONEAR via La Palma in the Canary Islands, 1 in MPEC 2018-R08 -- 2014 OL339
C41MASTER-II Kislovodsk in Russia, 1 in MPEC 2018-R08 -- 18109
J69North Obs. in England, 1 in MPEC 2018-R08 -- 1998 SD9
Z80Northolt Branch Obs. in England, 5 in MPECs 2018-R07 & 2018-R08 -- 2018 RA, 2018 QU1, 2018 LQ2, 2015 FP118, 2011 UA
L04ROASTERR-1 in Romania, 1 in MPEC 2018-R07 -- 2018 RA
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-R06 -- 2018 QV1
H36Sandlot Obs. in Kansas, 2 in MPECs 2018-R06 & 2018-R07 -- 2018 RA, 2018 QV1
C95SATINO-1 in France, 3 in MPECs 2018-R06 & 2018-R08 -- 2018 QV1, 2015 FP118, 1998 SD9
G40!M. Kumrucu-Lohmiller in Massachusetts via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-R08 -- 2018 LQ2
G409B. Lutkenhoner in Germany via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-R08 -- 1998 SD9
Y00SONEAR in Brazil, 2 in MPECs 2018-R06 & 2018-R08 -- 2018 QV1, 1627
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2018-R08 -- 2009 TK, 363027
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-R08 -- 105140
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2018-R06 -- 2018 QV1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-R08 -- 2018 LR6
718Wiggins Obs. in Utah, 1 in MPEC 2018-R08 -- 144332
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 September '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 Sentry1530R E M O V E DJPL: Risk listing removed at 1443 UTC today
NEODyS1530R E M O V E D-
2018 QSNEODyS16022084-211621.32e-06-6.68-6.760NEODyS: "Based on 53 optical observations (of which 0 are rejected as outliers) from 2018-08-18.481 to 2018-09-02.210."
JPL Sentry15302084-211641.252129e-06-6.70-6.780JPL: Computed at 07:47 today Pacific time based on 53 observations spanning 14.730 days (2018-Aug-18.47984 to 2018-Sep-02.209423). Diameter approximately 0.020 km. from weighted mean H=26.18.

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 3 September '18

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

2200Grabbed MPEC 2018-R09 - 2014 TW32 - see above
Grabbed MPEC 2018-R10 - 2015 BW92 - see above
1744Generated Traffic Report
1602Noted that NEODyS has updated its 2018 QS risk assessment - see above
1548Grabbed MPEC 2018-R08 - Daily Orbit Update - see above
1530Noted that JPL Sentry has removed 2018 QJ1 as an impact risk - see above
Noted that NEODyS has removed 2018 QJ1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 QS risk assessment - see above
0434Grabbed MPEC 2018-R06 - 2018 QV1 - see above
Grabbed MPEC 2018-R07 - 2018 RA - see above