Contents  on 10 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 10 September '17

Two objects reported inside ten LD

Two minor objects are reported to be within ten lunar distances (LD) of Earth today, both moving away. 2017 RB travels from 5.69 to 6.60 LD and intruder 2017 QB35 from 5.94 to 6.80 LD.

Earth passage I D ~Size Distance Today  Notes
0.93 LD Sept. 32017 QB35 5 m  5.94 to 6.80 LD intruder
3.78 LD Sept. 62017 RB 8 m  5.69 to 6.60 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 1710 UTC with first follow-up from last month for risk-listed 2017 QF3 in today's DOU MPEC, adding 1.07 days to it 3.55-day discovery arc.

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 10 September '17

The MPC's NEO Confirmation Page has 44 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 44 objects listed. Of these, 20 were "one nighters." So far The Tracking News has counted a total of 46 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 10 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 10 Sept. '17 >>  MPEC 2017-R44 - "12:02 UT" - Daily Orbit Update

Observers  on 10 September '17

Thirteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2017-R44 -- 2017 QR16, 2017 QQ35, 2017 QL35, 2017 PT25, 2017 PS25
T08ATLAS Mauna Loa in Hawaii, 9 in MPEC 2017-R44 -- 2017 PS25, 2014 YC15, 2004 TQ13, 90075, 496018, 326388, 142464, 4197, 1865
K88GINOP-KHK in Hungary, 4 in MPEC 2017-R44 -- 2017 QV34, 2017 QL35, 2017 QF3, 2017 PT25
U699Steven M. Tilley in Louisiana via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-R44 -- 2017 RL
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-R44 -- 2000 BE19
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2017-R44 -- 2017 OL1
Z80Northolt Branch Obs. in England, 6 in MPEC 2017-R44 -- 2017 RL, 495848, 322763, 265962, 190166, 3122
J43Oukaimeden Obs. in Morocco, 3 in MPEC 2017-R44 -- 2014 YC15, 90075, 9202
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2017-R44 -- 2017 QL35, 2017 OS18, 2015 QE9
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2017-R44 -- 2017 QW17, 2017 QL33, 2017 NK
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-R44 -- 3122
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-R44 -- 2004 TQ13
718Wiggins Obs. in Utah, 1 in MPEC 2017-R44 -- 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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 RLJPL Sentry15462072-207216.811e-08-4.02-4.020JPL: Computed at 07:48 today Pacific time based on 79 observations spanning 7.4387 days (2017-Sep-01.5615 to 2017-Sep-09.000154). Diameter approximately 0.670 km. from weighted mean H=18.51.
2017 QF3JPL Sentry15462043-2101283.19720445e-05-5.69-6.090JPL: Computed at 08:05 today Pacific time based on 23 observations spanning 4.6175 days (2017-Aug-17.3729 to 2017-Aug-21.99036). Diameter approximately 0.009 km. from weighted mean H=27.84.
NEODyS15462035-2112452.1e-06-7.01-7.730NEODyS: "Based on 23 optical observations (of which 1 are rejected as outliers) from 2017-08-17.374 to 2017-08-21.991."

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 10 September '17

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

1710Generated Traffic Report
1546Noted that JPL Sentry has updated its 2017 QF3 risk assessment - see above
Noted that NEODyS has updated its 2017 QF3 risk assessment - see above
Noted that JPL Sentry has updated its 2017 RL risk assessment - see above
Grabbed MPEC 2017-R44 - Daily Orbit Update - see above