Contents  on 5 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 5 September '17

Three objects reported inside ten LD

Today there are three known transient natural objects traveling less than ten lunar distances (LD) from Earth. Nearest is intruder 2017 QB35, which exits Earth's SOI, moving out from 1.73 to 2.53 LD.

Earth passage I D ~Size Distance Today  Notes
0.93 LD Sept. 32017 QB35 5 m  1.73 to 2.53 LD intruder, exits Earth SOI - DOU
3.78 LD tomorrow2017 RB 8 m  3.80 from 4.09 LD
4.36 LD Sept. 12017 QG18 12 m  6.58 to 7.74 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 - DOU, links
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 1842 UTC with follow-up in today's DOU MPEC for 2017 QB35 and 2012 TC4, for which the recovery campaign has resumeed after starting in late July and early August.

Reading: The 2012 TC4 radar planning page discusses how this object's orbit was changed by its 2012 intrusion and how it will change again with this year's close passage. And NASA/JPL reports that radar observation of large and "fairly round" NEO 3122 Florence (1981 ET3) found that it has two moons.

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 5 September '17

The MPC's NEO Confirmation Page has 59 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 59 objects listed. Of these, 32 were "one nighters." So far The Tracking News has counted a total of 67 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 5 September '17

Minor Planet Electronic Circulars

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

MPEC 2017-R33 - "14:03 UT" - 2017 RL

MPEC 2017-R32 - "13:54 UT" - 2017 RK

<< DOU on 5 Sept. '17 >>  MPEC 2017-R31 - "12:03 UT" - Daily Orbit Update

MPEC 2017-R30 - "10:22 UT" - 2010 PY75

Observers  on 5 September '17

A total of 32 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-R31 -- 496005
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2017-R31 & 2017-R32 -- 2017 RK, 2017 QK18, 2017 QJ18, 2017 QB35, 2017 PC27, 2017 PA27, 496005
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2017-R31 -- 496005, 294739, 153415
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-R31 -- 2017 MY3
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-R31 -- 2014 YC15
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2017-R31 -- 2011 XO3
J27El Guijo Obs. in Spain, 5 in MPEC 2017-R31 -- 90075, 265962, 190166, 7336, 3122
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-R33 -- 2017 RL
K83Forti Obs., 4 in MPEC 2017-R31 -- 2014 YC15, 422699, 6053, 3122
K88GINOP-KHK in Hungary, 1 in MPEC 2017-R33 -- 2017 RL
J95Great Shefford Obs. in England, 1 in MPEC 2017-R33 -- 2017 RL
H06#M. Suzuki in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-R33 -- 2017 RL
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-R31 -- 496005
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2017-R31 -- 422699
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 3 in MPEC 2017-R31 -- 2017 HH, 2012 TC4, 2005 UN157
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-R33 -- 2017 RL
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-R31 -- 1980
900Moriyama Obs. in Japan, 1 in MPEC 2017-R33 -- 2017 RL
K74Muensterschwarzach Obs. in Germany, 6 in MPEC 2017-R31 -- 2014 YC15, 90075, 496018, 422699, 6053, 3122
C23Olmen Obs. in Belgium, 1 in MPEC 2017-R31 -- 3122
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-R31 -- 52762
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2017-R31, 2017-R32 & 2017-R33 -- 2017 RL, 2017 RK, 2014 VM, 2010 MW
B49Paus Obs. in Spain, 1 in MPEC 2017-R33 -- 2017 RL
C95SATINO-1 in France, 1 in MPEC 2017-R33 -- 2017 RL
G40'program code "'" (16) via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-R33 -- 2017 RL
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-R32 -- 2017 RK
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-R31 -- 3122
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2017-R31 & 2017-R33 -- 2017 RL, 153415
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2017-R30 & 2017-R31 -- 2016 EU85, 2010 PY75
718Wiggins Obs. in Utah, 2 in MPECs 2017-R31 & 2017-R33 -- 2017 RL, 3122
C51WISE in Earth polar orbit, 5 in MPEC 2017-R31 -- 2017 HH, 2010 CO1, 2007 TR65, 495848, 152667
I15Wishing Star Obs. in Rhode Island, 1 in MPEC 2017-R31 -- 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 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 Sentry16332072-207213.355e-07-3.25-3.250JPL: Computed at 08:49 today Pacific time based on 48 observations spanning 3.8823 days (2017-Sep-01.5615 to 2017-Sep-05.44376). Diameter approximately 0.720 km. from weighted mean H=18.36.

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 5 September '17

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

1842Generated Traffic Report
1633Noted that JPL Sentry has posted 2017 RL as an impact risk - see above
1548Grabbed MPEC 2017-R30 - 2010 PY75 - see above
Grabbed MPEC 2017-R31 - Daily Orbit Update - see above
Grabbed MPEC 2017-R32 - 2017 RK - see above
Grabbed MPEC 2017-R33 - 2017 RL - see above