Contents  on 9 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 9 September '17

Two objects reported inside ten LD

Today two asteroidal objects are known to be less than ten lunar distances (LD) from our home world. 2017 RB is outbound from 4.89 to 5.69 LD and intruder 2017 QB35 moves away from 5.07 to 5.94 LD.

Earth passage I D ~Size Distance Today  Notes
0.93 LD Sept. 32017 QB35 5 m  5.07 to 5.94 LD intruder
3.78 LD Sept. 62017 RB 8 m  4.89 to 5.69 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 1621 UTC.

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 9 September '17

The MPC's NEO Confirmation Page has 46 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 46 objects listed. Of these, 29 were "one nighters." So far The Tracking News has counted a total of 52 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 9 September '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 9 Sept. '17 >>  MPEC 2017-R43 - "12:02 UT" - Daily Orbit Update

Observers  on 9 September '17

Eighteen observers appear in today's MPEC.

CodeObserver / observatory
C97Al-Fulaij Obs., 2 in MPEC 2017-R43 -- 6053, 3122
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPEC 2017-R43 -- 2017 NO6, 2017 MM7, 2017 MD4, 2017 MA4, 2015 JD2, 2013 JY35, 494713, 368565
T05ATLAS Haleakala in Hawaii, 7 in MPEC 2017-R43 -- 2017 RL, 2008 MH1, 68950, 294739, 237805, 153415, 6053
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-R43 -- 495858
160Castelmartini Obs. in Italy, 5 in MPEC 2017-R43 -- 2008 MH1, 416584, 322763, 237805, 141670
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-R43 -- 3122
K88GINOP-KHK in Hungary, 1 in MPEC 2017-R43 -- 2017 QS17
J95Great Shefford Obs. in England, 1 in MPEC 2017-R43 -- 2017 RL
I89'Steven M. Tilley in Louisiana via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2017-R43 -- 2017 RL
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-R43 -- 2017 OP68
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPEC 2017-R43 -- 2017 QL35, 2017 QK18, 2017 PT25, 2017 PS30, 2015 XR128, 2015 FH120, 2014 NE64, 85818, 52762, 385580, 338176
K63Pascoli Obs. in Italy, 1 in MPEC 2017-R43 -- 265962
A48Povegliano Veronese Obs. in Italy, 1 in MPEC 2017-R43 -- 2017 PS25
L04ROASTERR-1 in Romania, 3 in MPEC 2017-R43 -- 2014 YC15, 422699, 3122
G403Tony Evans in Portugal via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-R43 -- 2017 QN18
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-R43 -- 3122
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2017-R43 -- 495848, 20460
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-R43 -- 2011 FS9
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 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 RLNEODyS1731R E M O V E D-
JPL Sentry15452072-207219.078e-08-3.89-3.890JPL: Computed at 07:48 today Pacific time based on 73 observations spanning 7.4135 days (2017-Sep-01.5615 to 2017-Sep-08.97502). Diameter approximately 0.670 km. from weighted mean H=18.51.
2008 EM68JPL Sentry15452017-211611151.35601988e-05-5.11-5.470JPL: Computed at 00:27 April 7th Pacific time based on 12 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183). Diameter approximately 0.010 km. from weighted mean H=27.72.

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 September '17

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

1731Noted that NEODyS has removed 2017 RL as an impact risk - see above
1621Generated Traffic Report
1545Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
Noted that JPL Sentry has updated its 2017 RL risk assessment - see above
Grabbed MPEC 2017-R43 - Daily Orbit Update - see above