Contents  on 9 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 9 October '17

Six objects reported inside ten LD

There are six Solar-System small bodies known to be within ten lunar distances (LD) of Earth today. Nearest is risk-listed radar/NHATS target intruder 2012 TC4, inbound from 4.83 to 3.35 LD.

Earth passage I D ~Size Distance Today  Notes
0.13 LD Oct. 122012 TC4 15 m  3.35 from 4.83 LD intruder, radar/NHATS target, risk - DOU
0.23 LD Oct. 22017 SX17 8 m  9.96 to 11.48 LD exits ten LD, intruder
1.14 LD Oct. 52017 TB 5 m  4.39 to 5.69 LD risk
2.66 LD Oct. 62017 TA 37 m  5.97 to 8.32 LD
8.93 LD Oct. 112017 SB20 36 m  9.09 from 9.51 LD DOU
8.96 LD tomorrow2017 SN21 21 m  9.03 from 9.40 LD
Approaching (sorted by 10-LD bubble entry date)
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
8.66 LD Nov. 17444584 2006 UK 309 m  < 10 LD Nov. 16

This report was generated at 2010 UTC with follow-up in today's DOU MPEC for 2017 SB20 and 2012 TC4.

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.

Radar Astrometry  on 9 October '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 2319 UTC when the database was dated 9 Oct.

NEOCP Activity  on 9 October '17

The MPC's NEO Confirmation Page has 39 listings

When last checked at 2319 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 39 objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 49 listings on the NEOCP today.

New MPECs  on 9 October '17

Minor Planet Electronic Circulars

As of last check at 2319 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 9 Oct. '17 >>  MPEC 2017-T41 - "12:04 UT" - Daily Orbit Update

MPEC 2017-T40 - "01:51 UT" - 2014 DT110

Observers  on 9 October '17

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-T41 -- 2010 SA12
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-T41 -- 2012 TC4
160Castelmartini Obs. in Italy, 7 in MPEC 2017-T41 -- 2017 FJ90, 2012 TC4, 68950, 496018, 250458, 220909, 142040
J27El Guijo Obs. in Spain, 1 in MPEC 2017-T41 -- 2012 TC4
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2012 TC4
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2017-T41 -- 2012 TC4
D95Kurihara Obs. in Japan, 1 in MPEC 2017-T41 -- 4197
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-T41 -- 2012 TC4
J69North Obs. in England, 1 in MPEC 2017-T41 -- 2012 TC4
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-T41 -- 2012 TC4
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2017-T41 -- 2017 SN2, 438897
K63Pascoli Obs. in Italy, 1 in MPEC 2017-T41 -- 2012 TC4
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2017-T41 -- 2017 RR15, 2012 TC4, 20826
104San Marcello Pistoiese Obs. in Italy, 2 in MPEC 2017-T41 -- 2017 TC1, 2012 TC4
033Schwarzschild Obs. in Germany, 1 in MPEC 2017-T41 -- 2012 TC4
G40&program code "&" (15) via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-T41 -- 2012 TC4
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-T41 -- 3122
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-T41 -- 2012 TC4
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-T41 -- 2012 TC4
926Tenagra II Obs. in Arizona, 16 in MPECs 2017-T40 & 2017-T41 -- 2017 SY20, 2017 ST17, 2017 SN16, 2017 SB20, 2017 RU1, 2017 GN4, 2016 TE93, 2015 UM67, 2015 UK52, 2014 DT110, 2012 TK123, 2011 VV5, 2007 DM41, 2005 RQ6, 2004 QF1, 2002 RN38
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 October '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2319 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 TK1JPL Sentry1730R E M O V E DJPL #2 for the day
2017 OD69JPL Sentry1630R E M O V E DJPL: Risk listing removed at 0049 UTC Oct. 8th, 2017 OD69 = 2017 TK1.
2012 TC4NEODyS1630R E M O V E D-
JPL Sentry16302077-2112190.0010302-4.11-4.160JPL: Computed at 09:04 today Pacific time based on 309 observations spanning 1823.7 (2012-10-4.46766 to 2017-10-2.21201). Diameter approximately 0.015 km. from weighted mean H=26.78.

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 9 October '17

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

2319Noted Radar Astrometry database update - see above
2010Generated Traffic Report
1730Noted that JPL Sentry has removed 2017 TK1 as an impact risk - see above
1630Noted that JPL Sentry has updated its 2012 TC4 risk assessment - see above
Noted that NEODyS has removed 2012 TC4 as an impact risk - see above
Noted that JPL Sentry has removed 2017 OD69 as an impact risk - see above
Noted that JPL Sentry has posted 2017 TK1 as an impact risk - see above
Grabbed MPEC 2017-T41 - Daily Orbit Update - see above
0445Grabbed MPEC 2017-T40 - 2014 DT110 - see above