Contents  on 8 June '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 8 June '17

Five objects reported inside ten LD

Five minor planets are known to be within ten lunar distances (LD) of our big planet today. Closest are risk-listed 2017 KQ27, moving away from 3.45 to 5.78 LD, and risk-listed 2017 LD, outbound from 4.06 to 4.84 LD.

Earth passage I D ~Size Distance Today  Notes
1.02 LD June 62017 KQ27 23 m  3.45 to 5.78 LD risk
1.90 LD May 242017 KJ32 6 m  8.22 to 8.76 LD risk
2.99 LD June 52017 LD 10 m  4.06 to 4.84 LD risk - DOU
5.18 LD yesterday2017 LE 18 m  5.50 to 6.47 LD
7.00 LD June 62017 KR27 69 m  8.74 to 10.67 LD exits ten LD

This report was generated at 2038 UTC with follow-up in today's DOU MPEC for 2017 LD (adding 18.99 days to its 4.17-day observation arc) as well as departed radar targets 2017 CS and 418094 2007 WV4, and distant 484402 2007 XH16.

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. "Distant" is used here to describe an object that has come within ten LD since A/CC began these traffic reports (2007) but is not now so close. 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 8 June '17

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, one was a "one nighter."

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 8 June '17

Minor Planet Electronic Circulars

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

<< DOU on 8 June '17 >>  MPEC 2017-L54 - "12:02 UT" - Daily Orbit Update

Observers  on 8 June '17

Fourteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2017-L54 -- 2017 HY50, 2017 HN3, 2017 DS35, 2011 ED78, 66391, 456651, 222073, 163696, 11398, 7888
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-L54 -- 20460
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-L54 -- 11398
160Castelmartini Obs. in Italy, 8 in MPEC 2017-L54 -- 2017 HY50, 2011 ED78, 484402, 190166, 163696, 6063, 2329, 1917
W843program code 3 via DECam in Chile, 1 in MPEC 2017-L54 -- 2014 SZ303
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-L54 -- 2017 KU34
130Lumezzane Obs. in Italy, 5 in MPEC 2017-L54 -- 2013 CL118, 68348, 484402, 242191, 5879
W92MASTER OAFA Obs., 1 in MPEC 2017-L54 -- 1036
0895program code 5 via Nikolaev Obs. in the Ukraine, 2 in MPEC 2017-L54 -- 66391, 137170
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2017-L54 -- 2017 LD
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2017-L54 -- 2017 HY50, 2017 CS, 2011 ED78, 66391, 418094, 11398, 6063, 1917
926Tenagra II Obs. in Arizona, 2 in MPEC 2017-L54 -- 2017 LG, 2017 LD
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-L54 -- 265482
C51WISE in Earth polar orbit, 2 in MPEC 2017-L54 -- 175189, 5660
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 June '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 LDJPL Sentry23272045-21165280.0103543231391-3.28-3.330JPL #3 for the day: Computed at 16:04 today Pacific time based on 80 observations spanning 23.163 days (2017-May-16.298488 to 2017-Jun-08.46152). Diameter approximately 0.010 km. from weighted mean H=27.71.

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 8 June '17

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

2327Noted that JPL Sentry has updated its 2017 LD risk assessment - see above
2038Generated Traffic Report
1947Noted that JPL Sentry has updated its 2017 LD risk assessment - see above
1700Noted that JPL Sentry has updated its 2017 LD risk assessment - see above
1544Grabbed MPEC 2017-L54 - Daily Orbit Update - see above