Contents  on 4 October '17

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 4 October '17

Three objects reported inside ten LD

There are three minor objects reported inside ten lunar distances (LD) of our home world today. Intruder 2017 SX17 is the closest and is outbound from 2.41 to 3.91 LD.

Earth passage I D ~Size Distance Today  Notes
0.23 LD Oct. 22017 SX17 8 m  2.41 to 3.91 LD intruder
5.38 LD yesterday2017 SS16 18 m  6.07 to 8.40 LD
7.87 LD Sept. 291989 VB 389 m  9.81 to 10.71 LD exits ten LD, radar target
Approaching (sorted by 10-LD bubble entry date)
0.13 LD Oct. 122012 TC4 15 m  < 10 LD tomorrow, intruder, radar/NHATS target, risk
8.94 LD Oct. 112017 SB20 36 m  < 10 LD Oct. 8
8.5   LD Oct. 132005 TE49 15 m  < 10 LD Oct. 11, uncertainty +/- 10.1167 hours, NHATS target
5.77 LD Oct. 22171576 1999 VP11 645 m  < 10 LD Oct. 20

This report was generated at 1610 UTC with astrometry from July for risk-listed 2017 OO1 in today's DOU MPEC.

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 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 4 October '17

The MPC's NEO Confirmation Page has 103 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 103 objects listed. Of these, 25 were "one nighters." So far The Tracking News has counted a total of 108 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 4 October '17

Minor Planet Electronic Circulars

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

<< DOU on 4 Oct. '17 >>  MPEC 2017-T15 - "12:18 UT" - Daily Orbit Update

Observers  on 4 October '17

Seventeen observers appear in today's MPEC.

CodeObserver / observatory
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2017-T15 -- 2017 OP68, 496005, 333888, 220909
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-T15 -- 2004 SS
073Bucharest Obs. in Romania, 1 in MPEC 2017-T15 -- 333888
160Castelmartini Obs. in Italy, 13 in MPEC 2017-T15 -- 2017 RV1, 2017 OP68, 2017 FJ90, 2014 YC15, 2008 MH1, 2004 SS, 1993 RA, 85709, 496005, 333888, 265962, 250458, 142040
703Catalina Sky Survey (CSS) in Arizona, 12 in MPEC 2017-T15 -- 2017 SN14, 2017 PJ26, 2014 YC15, 2008 MH1, 1999 AF4, 209924, 190208, 172034, 153415, 137078, 111253, 4197
W19Kalamazoo Obs. in Michigan, 2 in MPEC 2017-T15 -- 90075, 6053
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2017-T15 -- 2017 SV20
K91LCO Sutherland A in South Africa, 1 in MPEC 2017-T15 -- 485652
130Lumezzane Obs. in Italy, 6 in MPEC 2017-T15 -- 2017 RV1, 2017 OP68, 2017 FJ90, 2014 YC15, 2013 RE21, 441825
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPEC 2017-T15 -- 2017 PJ26, 2012 DP8, 2011 XO3, 2010 WL, 2000 YJ29, 1999 AF4, 53430, 172034, 153415
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPEC 2017-T15 -- 2017 SO17, 2017 OP68, 2017 OO1, 2014 XG8, 2009 SP171, 31221, 177255, 17182, 8176
Z38Picoto Obs., 2 in MPEC 2017-T15 -- 496018, 190166
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-T15 -- 3122
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-T15 -- 153415
926Tenagra II Obs. in Arizona, 5 in MPEC 2017-T15 -- 2017 ST14, 2017 SQ12, 2017 SP12, 2017 SO10, 2017 SK20
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-T15 -- 2010 GR75
C51WISE in Earth polar orbit, 6 in MPEC 2017-T15 -- 2011 JU2, 2010 WL, 87684, 68950, 483560, 3752
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 October '17

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
2017 SV20JPL Sentry1555R E M O V E DJPL: Risk listing removed at 1456 UTC today.
2017 OO1JPL Sentry15552115-211513.496e-08-7.57-7.570JPL: Computed at 08:02 today Pacific time based on 101 observations spanning 8.6032 days (2017-Jul-22.66455 to 2017-Jul-31.2677). Diameter approximately 0.042 km. from weighted mean H=24.52.

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 4 October '17

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

1610Generated Traffic Report
1555Noted that JPL Sentry has updated its 2017 OO1 risk assessment - see above
Noted that JPL Sentry has removed 2017 SV20 as an impact risk - see above
Grabbed MPEC 2017-T15 - Daily Orbit Update - see above