Contents  on 9 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 9 August '17

One object reported inside ten LD

There is one asteroidal object reported flying inside ten lunar distances (LD) of our home world today. 2017 NB7 heads away from 7.63 to 8.31 LD.

Earth passage I D ~Size Distance Today  Notes
6.83 LD Aug. 62017 NB7 77 m  7.63 to 8.31 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 1854 UTC with observations from June or July in today's DOU MPEC for four departed objects: 2017 OO1 (intruder, risk listed), 2017 MC4, 2017 OL19, and 2017 CS (radar target).

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 9 August '17

The MPC's NEO Confirmation Page has 52 listings

When last checked at 2327 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 52 objects listed. Of these, nineteen were "one nighters."

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 August '17

Minor Planet Electronic Circulars

As of last check at 2327 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 9 Aug. '17 >>  MPEC 2017-P35 - "12:03 UT" - Daily Orbit Update

Observers  on 9 August '17

Eleven observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPEC 2017-P35 -- 2017 OQ19, 2017 OO19, 2017 OO1, 2017 ON19, 2017 OL19, 2017 OG68, 2017 OD20, 2017 NU6, 2017 NT6, 2017 NH, 2017 MM7, 2017 MK8, 2017 MD4, 2017 MD3, 2017 MC7, 2017 MC4, 2017 FL1, 2017 DO109, 2017 CS, 2011 JW10, 66391, 477519, 20460, 142040, 12538, 6063, 1980, 1917
T05ATLAS Haleakala in Hawaii, 13 in MPEC 2017-P35 -- 2017 GQ6, 96631, 68348, 485652, 385580, 366733, 237805, 232368, 136923, 13651, 6050, 3752, 1980
006Fabra Obs. in Spain, 1 in MPEC 2017-P35 -- 6053
B34Green Island Obs. in Cyprus, 4 in MPEC 2017-P35 -- 68950, 20460, 142561, 11398
C23Olmen Obs. in Belgium, 1 in MPEC 2017-P35 -- 190166
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPEC 2017-P35 -- 2015 YR1, 2009 BF, 68348, 495857, 488465, 31221, 219021, 162269, 159399, 5879
Z38Picoto Obs., 1 in MPEC 2017-P35 -- 20460
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-P35 -- 2017 GQ6
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-P35 -- 2016 CO246
Q65Warrumbungle Obs. in New South Wales, 1 in MPEC 2017-P35 -- 138925
C51WISE in Earth polar orbit, 1 in MPEC 2017-P35 -- 2017 OO1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 August '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2327 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 OO1NEODyS1800211516.27e-08-7.31-7.310NEODyS: "Based on 98 optical observations (of which 0 are rejected as outliers) from 2017-07-22.665 to 2017-07-31.269."
JPL Sentry15302115-211512.424e-07-6.73-6.730JPL: Computed at 08:03 today Pacific time based on 98 observations spanning 8.6032 days (2017-Jul-22.66455 to 2017-Jul-31.2677). Diameter approximately 0.042 km. from weighted mean H=24.51.

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 August '17

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

1854Generated Traffic Report
1800Noted that NEODyS has updated its 2017 OO1 risk assessment - see above
1530Noted that JPL Sentry has updated its 2017 OO1 risk assessment - see above
1445Grabbed MPEC 2017-P35 - Daily Orbit Update - see above