Contents  on 19 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 19 August '17

One object reported inside ten LD

One asteroid is known to be moving inside ten lunar distances (LD) of our planet today. 2017 PV25 is inbound from 7.66 to 6.73 LD.

Earth passage I D ~Size Distance Today  Notes
5.50 LD Aug. 222017 PV25 40 m  6.73 from 7.66 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 2200 UTC with the discovery announced yesterday of already departed 2017 PZ26 (MPEC), which went past us at 4.46 LD on August 9th. Today's DOU MPEC posts follow-up for 2017 PV25 and the recoveries of two distant former radar targets: 2017 BW and 152664 1998 FW4.

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. "Distant" is used here to describe objects that have approached Earth within ten LD since A/CC began these traffic reports ten-plus years ago but are not presently coming so close. 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 19 August '17

The MPC's NEO Confirmation Page has 107 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 107 objects listed. Of these, 35 were "one nighters." So far The Tracking News has counted a total of 116 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 19 August '17

Minor Planet Electronic Circulars

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

MPEC 2017-Q47 - "21:25 UT" - Comet P/2008 T4 = 2017 Q1 (Hill)

<< DOU on 19 Aug. '17 >>  MPEC 2017-Q46 - "12:04 UT" - Daily Orbit Update

Observers  on 19 August '17

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 24 in MPEC 2017-Q46 -- 2017 OW67, 2017 OT18, 2017 OB68, 2017 MK7, 2017 MG3, 2017 GQ6, 2017 CN1, 2017 BW, 2010 VD72, 2008 MH1, 2004 EK1, 96631, 68950, 496018, 482562, 374188, 286080, 26663, 142561, 11398, 7336, 6053, 2329, 1980
T05ATLAS Haleakala in Hawaii, 12 in MPEC 2017-Q46 -- 2017 PV25, 2008 MH1, 90075, 52762, 495848, 422699, 326388, 265962, 162186, 142464, 142040, 6053
T08ATLAS Mauna Loa in Hawaii, 9 in MPEC 2017-Q46 -- 2017 MY3, 2017 GQ6, 2014 UA192, 2014 SR339, 485652, 341816, 159467, 137799, 3752
160Castelmartini Obs. in Italy, 20 in MPEC 2017-Q46 -- 2017 PV25, 2014 YC15, 2008 MH1, 90075, 66146, 53319, 496018, 495848, 422699, 416584, 322763, 265962, 237805, 190166, 142040, 141670, 7336, 6053, 5143, 3288
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2017-Q46 -- 152664
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPEC 2017-Q46 -- 2017 PL26, 2017 OQ19
H15ISON New Mexico Obs. in New Mexico, 2 in MPEC 2017-Q46 -- 322763, 4197
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-Q46 -- 2017 PL26
Z43Landehen Obs., 2 in MPEC 2017-Q46 -- 190166, 2329
W92MASTER OAFA Obs., 1 in MPEC 2017-Q46 -- 7336
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-Q46 -- 434096
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2017-Q46 & 2017-Q47 -- P/2017 Q1, 2013 QH48, 2012 CO46, 2005 FH, 427499, 162195
K80Platanus Obs., 1 in MPEC 2017-Q46 -- 2017 PT25
K14Sencelles Obs. in Spain, 4 in MPEC 2017-Q46 -- 90075, 190166, 142561, 7336
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-Q46 -- 2008 AZ110
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2017-Q46 -- 2017 PV26, 2017 NK, 2017 MV2, 2017 FE1
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-Q46 -- 2329
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-Q46 -- 5786
C51WISE in Earth polar orbit, 2 in MPEC 2017-Q46 -- 2017 LU, 142040
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 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 PY26JPL Sentry02182108-211681.0943126e-06-4.75-5.270JPL: Computed at 17:56 Aug. 18th Pacific time based on 51 observations spanning 3.4715 days (2017-Aug-15.36698 to 2017-Aug-18.83843). Diameter approximately 0.110 km. from weighted mean H=22.41.
2017 PV26JPL Sentry16142048-204816.797e-06-3.17-3.170JPL: Computed at 07:47 today Pacific time based on 14 observations spanning 13.922 days (2017-Aug-05.56722 to 2017-Aug-19.48915). Diameter approximately 0.190 km. from weighted mean H=21.31.
NEODyS1614204819.0e-06-3.07-3.070NEODyS: "Based on 16 optical observations (of which 3 are rejected as outliers) from 2017-08-05.568 to 2017-08-19.490."
2017 PL26JPL Sentry16142076-2116502.34004202e-05-3.63-4.310JPL: Computed at 08:01 today Pacific time based on 99 observations spanning 5.4763 days (2017-Aug-13.40074 to 2017-Aug-18.877033). Diameter approximately 0.120 km. from weighted mean H=22.19.
NEODyS16142088-2117567.55e-06-4.03-4.590NEODyS: "Based on 99 optical observations (of which 3 are rejected as outliers) from 2017-08-13.402 to 2017-08-18.878."

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 19 August '17

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

2200Generated Traffic Report
2147Grabbed MPEC 2017-Q47 - Comet P/2008 T4 = 2017 Q1 (Hill) - see above
1614Noted that JPL Sentry has updated its 2017 PL26 risk assessment - see above
Noted that NEODyS has updated its 2017 PL26 risk assessment - see above
Noted that JPL Sentry has updated its 2017 PV26 risk assessment - see above
Noted that NEODyS has posted 2017 PV26 as an impact risk - see above
Grabbed MPEC 2017-Q46 - Daily Orbit Update - see above
0218Noted that JPL Sentry has posted 2017 PY26 as an impact risk - see above