Contents  on 14 July '17

NOTE:  These A/CC news pages will update less often for an extended period. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP efforts, and there may be some gaps in our traffic reporting for Earth's Busy Neighborhood.

Asteroid/Comet Connection (A/CC) Resources:

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Traffic Report  on 14 July '17

Three objects reported inside ten LD

Three asteroidal objects are reported flying inside ten lunar distances (LD) of the planet today. Within Earth's SOI (sphere of gravitational influence), risk-listed 2017 NT5 comes its closest to Earth this time around, reaching 1.11 LD at 1616 UTC, and also its closest to the Moon -- 1.27 LD at 1347 UTC. Further away, 2017 MR8 is inbound from 3.71 to 3.30 LD and 2017 NK2 is outbound from 5.75 to 6.98 LD. On approach next, NHATS target 2017 BS5 enters the ten LD space on July 16th.

This report was generated at 1736 UTC with additional observation of 2017 NT5 in today's DOU MPEC. We also note astrometry for one more radar target posted late yesterday -- NHATS target 2016 WB8 from last December.

NASA/JPL has posted a news item on "Asteroid 2012 TC4 to Safely Pass Earth This October."

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 14 July '17

The MPC's NEO Confirmation Page has 15 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of sixteen listings on the NEOCP today.

New MPECs  on 14 July '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.

<< DOU on 14 July '17 >>  MPEC 2017-N75 - "11:59 UT" - Daily Orbit Update

MPEC 2017-N74 - "02:33 UT" - 2015 BG311

Observers  on 14 July '17

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPEC 2017-N75 -- 2017 GQ6, 2017 BM31, 2008 MH1, 66391, 496018, 366733, 20460, 190166, 142561, 138846, 136818, 11398, 106589, 6063, 2329, 1980
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-N75 -- 2017 KE5
T08ATLAS Mauna Loa in Hawaii, 5 in MPEC 2017-N75 -- 2017 MB1, 2017 BM31, 138846, 106589, 7336
160Castelmartini Obs. in Italy, 1 in MPEC 2017-N75 -- 2017 NH
8071Marc W. Buie via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-N75 -- 2015 BG311
G58Chabot Obs. in northern California, 2 in MPEC 2017-N75 -- 2017 NH, 2017 MN7
006Fabra Obs. in Spain, 1 in MPEC 2017-N75 -- 190166
E10*program code "*" (19) via Faulkes Telescope South in New South Wales, 1 in MPEC 2017-N75 -- 2017 KR34
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2017-N75 -- 20460
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2017-N75 -- 2017 NT5
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2017-N75 -- 420210
A48Povegliano Veronese Obs. in Italy, 2 in MPEC 2017-N75 -- 2017 NH, 2017 BM31
Y00SONEAR in Brazil, 2 in MPEC 2017-N75 -- 1989 VB, 11398
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-N74 -- 2015 BG311
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 July '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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 NT5JPL Sentry15012050-211578.89759e-07-5.00-5.430JPL: Computed at 07:55 today Pacific time based on 68 observations spanning 20.566 days (2017-Jun-23.45994 to 2017-Jul-14.026395). Diameter approximately 0.091 km. from weighted mean H=22.86.
NEODyS13222050-2117129.09e-07-5.05-5.580NEODyS: "Based on 61 optical observations (of which 0 are rejected as outliers) from 2017-06-23.461 to 2017-07-13.747."
2017 MB1JPL Sentry1501R E M O V E DJPL: Risk listing removed at 1453 UTC today.

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 14 July '17

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

1736Generated Traffic Report
1501Noted that JPL Sentry has removed 2017 MB1 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 NT5 risk assessment - see above
1322Noted that NEODyS has posted 2017 NT5 as an impact risk - see above
Grabbed MPEC 2017-N74 - 2015 BG311 - see above
Grabbed MPEC 2017-N75 - Daily Orbit Update - see above