Contents  on 2 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 2 August '17

Two objects reported inside ten LD

Today two asteroidal objects are known to be inside ten lunar distances (LD) of our planet. Risk-listed 2017 OE7 is outbound from 8.02 to 8.91 LD and 2017 NB7 is inbound from 9.04 to 8.23 LD.

This report was generated at 1748 UTC with follow-up in today's DOU MPEC for departed 2017 OO1.

NASA/JPL has a couple news items about minor objects. The most recent reports excitement at how the return of little lost 2012 TC4 will "test NASA's network of observatories and scientists" in how well they do in recovering this risk-listed intruder -- "a team effort that involves more than a dozen observatories, universities and labs across the globe." The other report tells how analysis of observations from NASA's WISE mission "found that there are about seven times more long-period comets measuring at least 0.6 miles (1 kilometer) across than had been predicted previously [and] that long-period comets are on average up to twice as large as 'Jupiter family comets.'"

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 2 August '17

The MPC's NEO Confirmation Page has 67 listings

When last checked at 2345 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 67 objects listed. Of these, 23 were "one nighters." So far The Tracking News has counted a total of 82 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 2 August '17

Minor Planet Electronic Circulars

As of last check at 2345 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 2 Aug. '17 >>  MPEC 2017-P08 - "12:03 UT" - Daily Orbit Update

Observers  on 2 August '17

A total of 23 observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2017-P08 -- 2017 OO1, 2017 OL1, 2017 OJ7, 2017 OH7, 2017 OG1, 2017 OD, 2017 OC, 2017 MV2, 2017 MD4
T05ATLAS Haleakala in Hawaii, 11 in MPEC 2017-P08 -- 2008 MH1, 54789, 304640, 154144, 142561, 142464, 142040, 136818, 12538, 100926, 2329
T08ATLAS Mauna Loa in Hawaii, 12 in MPEC 2017-P08 -- 2017 OS18, 2017 OR19, 2017 BM31, 488494, 485652, 438452, 385580, 366733, 363024, 341816, 159467, 137799
B66Casasco Obs. in Italy, 5 in MPEC 2017-P08 -- 68950, 20460, 190166, 142561, 136818
160Castelmartini Obs. in Italy, 8 in MPEC 2017-P08 -- 2017 OG1, 2014 SR339, 496018, 304640, 190166, 142561, 138925, 11398
L00East Rome Obs., 1 in MPEC 2017-P08 -- 90075
J27El Guijo Obs. in Spain, 1 in MPEC 2017-P08 -- 11398
006Fabra Obs. in Spain, 2 in MPEC 2017-P08 -- 190166, 138925
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-P08 -- 2017 OH7
196Homburg-Erbach Obs. in Germany, 3 in MPEC 2017-P08 -- 416584, 190166, 142561
W19Kalamazoo Obs. in Michigan, 4 in MPEC 2017-P08 -- 190166, 11398, 2329, 1980
950.EURONEAR via La Palma in the Canary Islands, 1 in MPEC 2017-P08 -- 2012 FH38
Z80Northolt Branch Obs. in England, 5 in MPEC 2017-P08 -- 2014 SR339, 90075, 68950, 495848, 163693
C27Pallerols Obs. in Spain, 1 in MPEC 2017-P08 -- 2017 OL1
F51Pan-STARRS 1 (PS1) in Hawaii, 18 in MPEC 2017-P08 -- 2017 MD3, 2016 AG165, 2015 QE9, 2014 YC15, 2014 NF63, 2013 QH48, 2005 FH, 495511, 438452, 415267, 403039, 399446, 371336, 332408, 265196, 216115, 152685, 101955
Z38Picoto Obs., 1 in MPEC 2017-P08 -- 142561
K80Platanus Obs., 1 in MPEC 2017-P08 -- 2017 GQ6
W25RMS Obs., 6 in MPEC 2017-P08 -- 2017 OF7, 2017 NV5, 2017 KR34, 481394, 304640, 294739
G40!M. Kumrucu-Lohmiller in Massachusetts via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-P08 -- 2017 OF7
463Sommers-Bausch Obs. in Colorado, 6 in MPEC 2017-P08 -- 20460, 190166, 142561, 138846, 6063, 1980
Y00SONEAR in Brazil, 5 in MPEC 2017-P08 -- 2017 OL1, 438452, 159467, 138925, 6053
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-P08 -- 138925
C51WISE in Earth polar orbit, 1 in MPEC 2017-P08 -- 2009 WC52
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 August '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2345 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 OO1JPL Sentry15062115-211519.585e-07-6.13-6.130JPL: Computed at 08:04 today Pacific time based on 91 observations spanning 7.9072 days (2017-Jul-23.36054 to 2017-Jul-31.2677). Diameter approximately 0.043 km. from weighted mean H=24.50.
NEODyS1506211511.21e-07-7.02-7.020NEODyS: "Based on 91 optical observations (of which 0 are rejected as outliers) from 2017-07-23.361 to 2017-07-31.269."
2017 OM1NEODyS15062084-2117121.36e-06-5.16-5.520NEODyS: "Based on 136 optical observations (of which 4 are rejected as outliers) from 2017-07-22.508 to 2017-07-25.100."

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 2 August '17

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

1748Generated Traffic Report
1506Noted that NEODyS has updated its 2017 OM1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 OO1 risk assessment - see above
Noted that NEODyS has updated its 2017 OO1 risk assessment - see above
1422Grabbed MPEC 2017-P08 - Daily Orbit Update - see above