Contents  on 4 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 4 September '17

Six objects reported inside ten LD

Six asteroidal objects are known to be within ten lunar distances (LD) of our home world today. Closest is intruder 2017 QB35, which, still within Earth sphere of gravitational influence, moves out from 1.09 to 1.73 LD.

Earth passage I D ~Size Distance Today  Notes
0.93 LD yesterday2017 QB35 5 m  1.09 to 1.73 LD intruder, inside Earth SOI
2.79 LD Sept. 22017 QR32 16 m  6.47 to 10.28 LD exits ten LD
3.78 LD Sept. 62017 RB 8 m  4.09 from 4.67 LD
4.36 LD Sept. 12017 QG18 12 m  5.57 to 6.58 LD
4.82 LD Aug. 312017 QQ1 37 m  8.77 to 10.75 LD exits ten LD
6.42 LD Aug. 302017 QR35 30 m  9.45 to 10.64 LD exits ten LD - DOU
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 1714 UTC with first follow-up for 2017 QR35 in today's DOU MPEC along with additional observation of departed risk-listed 2017 RC.

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 4 September '17

The MPC's NEO Confirmation Page has 66 listings

When last checked at 2324 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 66 objects listed. Of these, 34 were "one nighters." So far The Tracking News has counted a total of 69 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 4 September '17

Minor Planet Electronic Circulars

As of last check at 2324 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 4 Sept. '17 >>  MPEC 2017-R29 - "12:03 UT" - Daily Orbit Update

Observers  on 4 September '17

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPEC 2017-R29 -- 2017 QY34, 495848, 153415, 1980
T05ATLAS Haleakala in Hawaii, 4 in MPEC 2017-R29 -- 2017 QR35, 2014 YC15, 90075, 100926
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2017-R29 -- 2017 PJ26, 385580
K46Bamberg Obs. in Germany, 1 in MPEC 2017-R29 -- 3122
160Castelmartini Obs. in Italy, 1 in MPEC 2017-R29 -- 3122
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2017-R29 -- 2017 RC, 2017 QQ35, 2017 QN35, 2017 QC17, 2017 PK26
J27El Guijo Obs. in Spain, 3 in MPEC 2017-R29 -- 68950, 496018, 3122
A17Guidestar Obs. in Germany, 4 in MPEC 2017-R29 -- 2017 QV34, 2017 PS25, 2017 NL6, 2017 HH
750Hobbs Obs. in Wisconsin, 1 in MPEC 2017-R29 -- 3122
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-R29 -- 3200
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-R29 -- 3122
Z43Landehen Obs., 2 in MPEC 2017-R29 -- 190166, 3122
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2017-R29 -- 2017 OG1, 2017 HS, 2005 EF, 8037
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2017-R29 -- 2010 MW, 2008 MH1
645Sloan Digital Sky Survey in New Mexico, 1 in MPEC 2017-R29 -- 2004 VJ1
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-R29 -- 3122
W34Squirrel Valley Obs. in North Carolina, 3 in MPEC 2017-R29 -- 96631, 90075, 20826
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-R29 -- 2016 EU85
K41Vegaquattro Obs. in Italy, 1 in MPEC 2017-R29 -- 496018
718Wiggins Obs. in Utah, 1 in MPEC 2017-R29 -- 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 September '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2324 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 RCJPL Sentry15302086-2117215.041697e-05-6.06-6.430JPL: Computed at 08:01 today Pacific time based on 27 observations spanning .99683 days (2017-Sep-01.38514 to 2017-Sep-02.38197). Diameter approximately 0.009 km. from weighted mean H=27.94.
NEODyS15302083-2117548.71e-05-5.83-6.030NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2017-09-01.386 to 2017-09-02.383."
2017 PV26NEODyS1530204814.19e-09-6.40-6.40NEODyS: "Based on 33 optical observations (of which 3 are rejected as outliers) from 2017-08-05.568 to 2017-08-31.921."

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 4 September '17

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

1714Generated Traffic Report
1530Noted that NEODyS has updated its 2017 PV26 risk assessment - see above
Noted that JPL Sentry has updated its 2017 RC risk assessment - see above
Noted that NEODyS has updated its 2017 RC risk assessment - see above
Grabbed MPEC 2017-R29 - Daily Orbit Update - see above