Contents  on 29 July '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 29 July '17

Two objects reported inside ten LD

Two asteroidal objects are reported within ten lunar distances (LD) of our planet today. Risk-listed 2017 OE7 is outbound, traveling from 5.10 to 5.68 LD, as is NHATS target 2017 BS5, moving from 7.43 to 8.62 LD. Coming toward Earth next, 2017 NB7 arrives inside ten LD on July 31st.

This report was generated at 1717 UTC with follow-up in today's DOU MPEC for 2017 BS5 plus astrometry from earlier this month for 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 29 July '17

The MPC's NEO Confirmation Page has 92 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 92 objects listed. Of these, 41 were "one nighters." So far The Tracking News has counted a total of 105 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 29 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.

MPEC 2017-O65 - "21:30 UT" - 2014 QF442

<< DOU on 29 July '17 >>  MPEC 2017-O64 - "11:59 UT" - Daily Orbit Update

Observers  on 29 July '17

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2017-O64 -- 142040, 136818, 2329
W847David Gerdes in Michigan via DECam in Chile, 1 in MPEC 2017-O65 -- 2014 QF442
J27El Guijo Obs. in Spain, 4 in MPEC 2017-O64 -- 68950, 496018, 142561, 11398
006Fabra Obs. in Spain, 1 in MPEC 2017-O64 -- 138925
D08Ghezz Obs. in Switzerland, 1 in MPEC 2017-O64 -- 68950
203GiaGa Obs. in Italy, 4 in MPEC 2017-O64 -- 2017 OL1, 2017 OG1, 2017 NM6, 496018
U69/program code "/" (24) via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-O64 -- 2017 CS
568_Marco Micheli on Mauna Kea in Hawaii, 3 in MPEC 2017-O64 -- 2017 OJ7, 2017 OG7, 2017 OF7
0895program code 5 via Nikolaev Obs. in Ukraine, 4 in MPEC 2017-O64 -- 2017 MB1, 2017 GQ6, 2017 BS5, 142561
C47Nonndorf Obs. in Austria, 1 in MPEC 2017-O64 -- 2017 OH7
C23Olmen Obs. in Belgium, 2 in MPEC 2017-O64 -- 2017 BM31, 190166
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2017-O64 -- 5143, 3288
K63Pascoli Obs. in Italy, 1 in MPEC 2017-O64 -- 2017 KR34
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2017-O64 -- 2014 SR339, 2013 RE21, 265962, 141670
G40!M. Kumrucu-Lohmiller in Massachusetts via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-O64 -- 2017 NL6
Y00SONEAR in Brazil, 1 in MPEC 2017-O64 -- 438452
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-O64 -- 138925
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2017-O64 -- 2017 FB1, 2017 DT35, 2017 BF30
C51WISE in Earth polar orbit, 4 in MPEC 2017-O64 -- 2015 FD341, 2002 JS2, 143992, 136582
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 July '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2234 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 MB1JPL Sentry15002098-209821.94155e-07-3.65-3.660JPL: Computed at 07:57 today Pacific time based on 427 observations spanning 35.795 days (2017-Jun-19.31418 to 2017-Jul-25.109676). Diameter approximately 0.590 km. from weighted mean H=18.81.
2017 FB1JPL Sentry15002098-210634.1788e-07-5.54-5.810JPL: Computed at 07:52 today Pacific time based on 48 observations spanning 36.957 days (2017-Mar-18.20739 to 2017-Apr-24.163996). Diameter approximately 0.071 km. from weighted mean H=23.39.

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 29 July '17

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

2234Grabbed MPEC 2017-O65 - 2014 QF442 - see above
1717Generated Traffic Report
1500Noted that JPL Sentry has updated its 2017 FB1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
1408Grabbed MPEC 2017-O64 - Daily Orbit Update - see above