Contents  on 9 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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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 July '17

Three objects reported inside ten LD

There are three asteroids reported within ten lunar distances (LD) of Earth today. 2017 MR8 is calculated to be the closest, moving in from 10.0 to about 8.5 LD*, while the other two are out beyond nine LD.

Earth passage I D ~Size Distance Today  Notes
3.3   LD July 152017 MR8 34 m  8.5 from 10.0 LD uncertainty +/- 32 mins.
5.38 LD July 32017 ME4 19 m  9.77 to 11.07 LD exits ten LD
7.61 LD July 112017 MC4 134 m  9.13 from 12.33 LD enters ten LD - DOU
3.12 LD July 232017 BS5 51 m  < 10 LD July 16, NHATS target

This report was generated at 1715 UTC with follow-up in today's DOU MPEC for 2017 MC4 and departed radar targets 2017 CS and 441987 2010 NY65. The DOUs of the last two days also carried observations of these three plus departed objects 2017 MD and NHATS target 2017 BS5. Additionally, radar observations were posted yesterday from late 2016 of 2016 VX1 and four NHATS targets: 2016 TB57 (risk), 2016 TG55, 2016 RD34 (risk), and Moon buzzing 2016 RE34

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. "Moon buzzing" is used here to describe an object that passes the Moon at less than one Earth-Moon distance but does not intrude into the Earth-Moon system during this passage. Object distances are derived by A/CC from JPL Horizons data. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 9 July '17

The MPC's NEO Confirmation Page has 27 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 27 objects listed. Of these, 20 were "one nighters." So far The Tracking News has counted a total of 30 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 9 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 9 July '17 >>  MPEC 2017-N62 - "12:02 UT" - Daily Orbit Update

MPEC 2017-N61 - "11:04 UT" - 2004 UR1

Observers  on 9 July '17

Twelve observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 10 in MPEC 2017-N62 -- 2017 CS, 2017 BM31, 441987, 416584, 366733, 232368, 190166, 142040, 141056, 2329
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2017-N62 -- 2017 MB1, 2008 MH1, 143992, 6063, 6053, 5143, 4954, 1980
160Castelmartini Obs. in Italy, 10 in MPEC 2017-N62 -- 2017 MB1, 2017 CS, 485652, 294739, 141670, 7977, 5660, 5143, 3752, 3288
107Cavezzo Obs. in Italy, 2 in MPEC 2017-N62 -- 2017 NH, 2017 MC4
J95Great Shefford Obs. in England, 1 in MPEC 2017-N62 -- 2017 NH
130Lumezzane Obs. in Italy, 4 in MPEC 2017-N62 -- 52750, 495331, 441987, 6063
Z80Northolt Branch Obs. in England, 4 in MPEC 2017-N62 -- 2017 NH, 2017 MC4, 2017 MB1, 2017 BM31
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2017-N62 -- 2017 NH
C23Olmen Obs. in Belgium, 2 in MPEC 2017-N62 -- 2017 NH, 2017 MB1
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPEC 2017-N62 -- 2017 HV4, 488494, 422699, 363024, 333908
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-N62 -- 2017 NH
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-N61 -- 2004 UR1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 July '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 MB1NEODyS1734209813.83e-08-4.29-4.290NEODyS #2 for the day: "Based on 196 optical observations (of which 1 are rejected as outliers) from 2017-06-19.315 to 2017-07-09.009."
2016 TB57NEODyS15032099-211153.06e-09-9.55-9.740NEODyS: "Based on 140 optical observations (of which 2 are rejected as outliers) from 2016-09-12.527 to 2017-04-01.366."
2016 RD34NEODyS15032051-21174151.48e-03-4.21-4.640NEODyS: "Based on 82 optical observations (of which 2 are rejected as outliers) from 2016-09-11.431 to 2016-12-22.326."
2004 ME6JPL Sentry20392019-2105451.00396e-07-5.51-6.340JPL: Computed at 17:23 April 12th Pacific time based on 8 observations spanning .87335 days (2004-Jun-25.35729 to 2004-Jun-26.23064). Diameter approximately 0.103 km. from weighted mean H=22.55.

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 July '17

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

2039Noted that JPL Sentry has updated its 2004 ME6 risk assessment - see above
1734Noted that NEODyS has updated its 2017 MB1 risk assessment - see above
1715Generated Traffic Report
1503Noted that NEODyS has updated its 2016 RD34 risk assessment - see above
Noted that NEODyS has updated its 2016 TB57 risk assessment - see above
Noted that NEODyS has reposted 2017 MB1 as an impact risk - see above
Grabbed MPEC 2017-N61 - 2004 UR1 - see above
Grabbed MPEC 2017-N62 - Daily Orbit Update - see above