Contents  on 16 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:

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 16 July '17

Four objects reported inside ten LD

Four transient natural objects are known to be within ten lunar distances (LD) of our home world today. 2017 MR8 is outbound from 3.60 to 4.45 LD and 2017 NK2 from 8.24 to 9.52 LD, and risk-listed 2017 NT5 leaves our ten-LD traffic reporting zone, heading out from 6.12 to 10.63 LD, while NHATS target 2017 BS5 enters the zone for the second time this year, moving in from 10.57 to 9.35 LD.

This report was generated at 1950 UTC with first follow-up for 2017 MF7 (adding 16.96 days to its 4.02-day observing arc) in today's DOU MPEC along with continuing follow-up for 2017 BS5 and departed radar target 2017 CS.

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 16 July '17

The MPC's NEO Confirmation Page has 23 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 23 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 28 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 16 July '17

Minor Planet Electronic Circulars

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

<< DOU on 16 July '17 >>  MPEC 2017-O06 - "11:59 UT" - Daily Orbit Update

MPEC 2017-O05 - "11:47 UT" - 2011 BY18

MPEC 2017-O04 - "11:01 UT" - 2017 NX5

MPEC 2017-O03 - "10:58 UT" - 2017 NW5

MPEC 2017-O02 - "10:56 UT" - 2017 NV5

MPEC 2017-O01 - "10:53 UT" - 2017 MD9

Observers  on 16 July '17

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 26 in MPECs 2017-O03 & 2017-O06 -- 2017 NW5, 2017 MM7, 2017 MK8, 2017 MB1, 2017 HV3, 2017 GQ6, 2017 FD65, 2017 BM31, 2015 JD2, 2015 HF9, 2011 YU62, 2008 MH1, 2008 HV4, 66391, 496018, 366733, 276660, 20460, 190166, 142561, 138846, 136818, 106589, 6063, 2329, 1980
T05ATLAS Haleakala in Hawaii, 20 in MPECs 2017-O04 & 2017-O06 -- 2017 NX5, 2017 MB1, 2017 BM31, 2011 ED78, 2008 MH1, 96631, 68348, 496018, 488494, 484517, 438452, 422699, 39796, 20460, 163696, 106589, 6053, 5143, 3288, 2202
T08ATLAS Mauna Loa in Hawaii, 4 in MPECs 2017-O04 & 2017-O06 -- 2017 NX5, 2017 NH, 2017 BS5, 456651
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-O02 -- 2017 NV5
B66Casasco Obs. in Italy, 3 in MPEC 2017-O06 -- 2017 MB1, 20460, 142561
160Castelmartini Obs. in Italy, 13 in MPEC 2017-O06 -- 2017 MB1, 2017 CS, 2017 BM31, 2011 ED78, 68348, 495331, 232368, 190166, 142561, 142040, 136818, 11398, 1980
107Cavezzo Obs. in Italy, 1 in MPEC 2017-O06 -- 2017 BM31
K65Cesena Obs. in Italy, 1 in MPEC 2017-O02 -- 2017 NV5
G58Chabot Obs. in northern California, 1 in MPEC 2017-O02 -- 2017 NV5
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2017-O03 -- 2017 NW5
I114Joseph Masiero in southern California via Gemini South Obs. in Chile, 1 in MPEC 2017-O01 -- 2017 MD9
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-O01 -- 2017 MD9
A13Naef Obs. in Switzerland, 2 in MPEC 2017-O06 -- 332408, 138925
C23Olmen Obs. in Belgium, 4 in MPEC 2017-O06 -- 2017 NH, 2017 MB1, 2017 BM31, 190166
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPECs 2017-O02, 2017-O03 & 2017-O06 -- 2017 NW5, 2017 NV5, 2017 MX2, 2017 MT8, 2017 KR34, 2016 YU8, 2015 ME54, 2015 FO124, 2014 YC15, 88254, 496124, 190491, 162149, 6063
W25RMS Obs., 1 in MPEC 2017-O04 -- 2017 NX5
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-O02 -- 2017 NV5
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-O02 -- 2017 NV5
Y00SONEAR in Brazil, 4 in MPECs 2017-O04 & 2017-O06 -- 2017 NX5, 2017 MB1, 2000 BE19, 190166
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 3 in MPECs 2017-O01, 2017-O05 & 2017-O06 -- 2017 MF7, 2017 MD9, 2011 BY18
C51WISE in Earth polar orbit, 2 in MPECs 2017-O01 & 2017-O06 -- 2017 MD9, 215442
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2017-O06 -- 2017 NH, 2017 KR34, 11398
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 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 MF7JPL Sentry1530R E M O V E DJPL: Risk listing removed at 1450 UTC today.
2017 MB1NEODyS2329209811.19e-07-3.80-3.80NEODyS: "Based on 249 optical observations (of which 2 are rejected as outliers) from 2017-06-19.315 to 2017-07-16.067."
JPL Sentry15302098-209819.127e-08-3.92-3.920JPL: Computed at 07:54 today Pacific time based on 248 observations spanning 26.752 days (2017-Jun-19.31418 to 2017-Jul-16.06592). Diameter approximately 0.620 km. from weighted mean H=18.68.

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 16 July '17

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

2329Noted that NEODyS has updated its 2017 MB1 risk assessment - see above
1950Generated Traffic Report
1530Noted that JPL Sentry has reposted 2017 MB1 as an impact risk - see above
Noted that JPL Sentry has removed 2017 MF7 as an impact risk - see above
1245Grabbed MPEC 2017-O01 - 2017 MD9 - see above
Grabbed MPEC 2017-O02 - 2017 NV5 - see above
Grabbed MPEC 2017-O03 - 2017 NW5 - see above
Grabbed MPEC 2017-O04 - 2017 NX5 - see above
Grabbed MPEC 2017-O05 - 2011 BY18 - see above
Grabbed MPEC 2017-O06 - Daily Orbit Update - see above