Contents  on 11 August '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 11 August '17

One object reported inside ten LD

One Solar-System small body is known to be less than ten lunar distances (LD) from our planet today. 2017 NB7 leaves our ten-LD traffic reporting "bubble," escaping from 9.14 to 10.07 LD.

Earth passage I D ~Size Distance Today  Notes
6.83 LD Aug. 62017 NB7 77 m  9.14 to 10.07 LD exits ten LD
Approaching (sorted by 10-LD bubble entry date)
7.87 LD Sept. 291989 VB 389 m  < 10 LD Sept. 25 - DOU
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 1952 UTC with follow-up in today's DOU MPEC for departed risk-listed 2017 OE7 and approaching 1989 VB.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting on transient natural objects that approach the actually significant 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 11 August '17

The MPC's NEO Confirmation Page has 43 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 43 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 45 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 11 August '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 11 Aug. '17 >>  MPEC 2017-P41 - "12:04 UT" - Daily Orbit Update

Observers  on 11 August '17

Eighteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2017-P41 -- 2017 PY24, 2017 MK7, 2017 ME7, 2013 PX6, 2008 MH1, 90075, 68950, 66146, 190166, 143624, 142040, 136818, 6053
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2017-P41 -- 2017 OE7, 2008 MH1, 480858
T08ATLAS Mauna Loa in Hawaii, 6 in MPEC 2017-P41 -- 2015 FO124, 485652, 480858, 385580, 366733, 232368
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-P41 -- 2017 PY24
J95Great Shefford Obs. in England, 2 in MPEC 2017-P41 -- 2017 PY24, 2017 OP19
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-P41 -- 1989 VB
585Kiev Comet Station in Ukraine, 1 in MPEC 2017-P41 -- 2017 PY24
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 5 in MPEC 2017-P41 -- 2017 NM6, 2017 LW, 2017 BM123, 2016 WJ1, 1999 VM11
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-P41 -- 2017 PY24
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPEC 2017-P41 -- 2017 OJ19, 2017 OG68
J69North Obs. in England, 2 in MPEC 2017-P41 -- 142561, 6053
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPEC 2017-P41 -- 2017 PY24, 2014 XK6, 2014 VM, 68950, 495857, 294739
Z38Picoto Obs., 1 in MPEC 2017-P41 -- 20460
W25RMS Obs., 1 in MPEC 2017-P41 -- 480858
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-P41 -- 2017 PY24
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-P41 -- 2329
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-P41 -- 2016 YM4
C51WISE in Earth polar orbit, 1 in MPEC 2017-P41 -- 2014 XK6
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 August '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 OP19NEODyS1942R E M O V E D-
JPL Sentry1609R E M O V E DJPL: Risk listing removed at 1448 UTC today.
2017 OE7NEODyS1942211411.52e-06-6.80-6.80NEODyS #2 for the day: "Based on 53 optical observations (of which 9 are rejected as outliers) from 2017-07-24.486 to 2017-08-04.611."
JPL Sentry16092114-211412.896e-05-5.66-5.660JPL: Computed at 07:58 today Pacific time based on 52 observations spanning 11.125 days (2017-Jul-24.48536 to 2017-Aug-04.610565). Diameter approximately 0.019 km. from weighted mean H=26.28.
2016 WJ1NEODyS19422104-211586.94e-07-4.58-5.260NEODyS: "Based on 390 optical observations (of which 3 are rejected as outliers) from 2003-07-04.606 to 2017-07-31.349."
2016 TB57NEODyS14302096-211679.8e-09-9.03-9.20NEODyS: "Based on 142 optical observations (of which 2 are rejected as outliers) from 2016-09-12.527 to 2017-04-01.366."
2015 XO129NEODyS14302080-211221.04e-08-8.25-8.40NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2015-11-19.037 to 2015-12-11.043."

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 11 August '17

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

1952Generated Traffic Report
1942Noted that NEODyS has updated its 2016 WJ1 risk assessment - see above
Noted that NEODyS has updated its 2017 OE7 risk assessment - see above
Noted that NEODyS has removed 2017 OP19 as an impact risk - see above
1609Noted that JPL Sentry has updated its 2017 OE7 risk assessment - see above
Noted that JPL Sentry has removed 2017 OP19 as an impact risk - see above
1430Noted that NEODyS has reposted 2015 XO129 as an impact risk - see above
Noted that NEODyS has updated its 2016 TB57 risk assessment - see above
Noted that NEODyS has updated its 2017 OE7 risk assessment - see above
Grabbed MPEC 2017-P41 - Daily Orbit Update - see above