Contents  on 6 September '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 6 September '17

Three objects reported inside ten LD

Three asteroids are reported traveling inside ten lunar distances (LD) of our planet today. Closest is intruder 2017 QB35, outbound from 2.53 to 3.36 LD.

Earth passage I D ~Size Distance Today  Notes
0.93 LD Sept. 32017 QB35 5 m  2.53 to 3.36 LD intruder
3.78 LD today2017 RB 8 m  3.78 LD Earth closest at 0810 UTC
4.36 LD Sept. 12017 QG18 12 m  7.74 to 8.99 LD
Approaching (sorted by 10-LD bubble entry date)
7.87 LD Sept. 291989 VB 389 m  < 10 LD Sept. 25
0.13 LD Oct. 122012 TC4 15 m  < 10 LD Oct. 5, intruder, radar/NHATS target, risk
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 1912 UTC with the recovery of distant and dim 2003 UV11 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. "Distant" is used here to describe an object that has come within ten LD since these traffic reports began ten-plus years ago but is not presently so close. 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 6 September '17

The MPC's NEO Confirmation Page has 61 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 61 objects listed. Of these, 28 were "one nighters." So far The Tracking News has counted a total of 64 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 6 September '17

Minor Planet Electronic Circulars

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

MPEC 2017-R35 - "20:37 UT" - 2008 TA2

<< DOU on 6 Sept. '17 >>  MPEC 2017-R34 - "12:03 UT" - Daily Orbit Update

Observers  on 6 September '17

Thirteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2017-R34 -- 2017 QV34, 2017 QS17, 2017 QQ35, 2017 QL35, 2017 PT25, 2017 PJ26, 2004 EK1, 2003 UV11, 496005, 29075
T05ATLAS Haleakala in Hawaii, 5 in MPEC 2017-R34 -- 2017 PJ26, 96631, 68348, 496005, 385580
006Fabra Obs. in Spain, 1 in MPEC 2017-R34 -- 3122
J95Great Shefford Obs. in England, 2 in MPEC 2017-R34 -- 2017 QY34, 496005
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2017-R34 -- 3122
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-R34 -- 142464
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-R34 -- 3122
W19Kalamazoo Obs. in Michigan, 2 in MPEC 2017-R34 -- 90075, 6053
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2017-R34 -- 2006 TU7, 2002 FD6
L21Ostrov Obs. in Romania, 2 in MPEC 2017-R34 -- 6053, 3122
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2017-R34 & 2017-R35 -- 2012 FH38, 2008 TA2, 495848, 242211, 136818, 100926
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-R34 -- 3122
718Wiggins Obs. in Utah, 1 in MPEC 2017-R34 -- 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 September '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 RLNEODyS1515207215.16e-08-4.07-4.070NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2017-09-01.562 to 2017-09-05.445."
2012 TC4NEODyS15152050-2112671.21e-03-3.87-3.990NEODyS: "Based on 262 optical observations (of which 0 are rejected as outliers) from 2012-10-04.468 to 2017-08-31.379."
JPL Sentry03352050-211270.0024333006-3.46-3.490JPL: Computed at 17:22 Sept. 5th Pacific time based on 234 observations spanning 1791.9 days (2012-Oct-04.467661 to 2017-Aug-31.3779). Diameter approximately 0.015 km. from weighted mean H=26.76.

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 6 September '17

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

2100Grabbed MPEC 2017-R35 - 2008 TA2 - see above
1912Generated Traffic Report
1515Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Noted that NEODyS has posted 2017 RL as an impact risk - see above
Grabbed MPEC 2017-R34 - Daily Orbit Update - see above
0335Noted that JPL Sentry has updated its 2012 TC4 risk assessment - see above