Contents  on 10 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 10 June '17

Four objects reported inside ten LD

There are four transient natural objects reported flying inside ten lunar distances (LD) of our planet today. Closest is risk-listed 2017 LD, which heads out from 5.72 to 6.65 LD.

Earth passage I D ~Size Distance Today  Notes
1.02 LD June 62017 KQ27 23 m  8.14 to 10.52 LD exits ten LD, risk
1.90 LD May 242017 KJ32 6 m  9.29 to 9.83 LD risk
2.99 LD June 52017 LD 10 m  5.72 to 6.65 LD risk - DOU
5.18 LD June 72017 LE 18 m  7.83 to 9.43 LD

This report was generated at 1910 UTC with follow-up in today's DOU MPEC for 2017 LD and for departed objects 2017 KN27, 2017 KG3 (7.89 days added to 4.90-day observation arc), and radar targets 2017 CS and 418094 2007 WV4, plus 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 presently 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 10 June '17

The MPC's NEO Confirmation Page has 19 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nineteen objects listed. Of these, three were "one nighters."

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 10 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 10 June '17 >>  MPEC 2017-L56 - "12:35 UT" - Daily Orbit Update

Observers  on 10 June '17

Twelve observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 22 in MPEC 2017-L56 -- 2017 KN27, 2017 KK3, 2017 KG3, 2017 HY50, 2017 HW48, 2017 HN3, 2017 HH2, 2017 HA1, 2017 FH90, 2017 DB109, 2011 ED78, 66391, 54789, 329774, 190166, 142040, 141056, 11398, 106589, 6063, 4341, 1980
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2017-L56 -- 484402, 142040, 2102
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2017-L56 -- 2017 CS, 2102
160Castelmartini Obs. in Italy, 10 in MPEC 2017-L56 -- 2017 CS, 68950, 484402, 416584, 190166, 106589, 7888, 6063, 2102, 1917
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2017-L56 -- 2017 KU34
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-L56 -- 2017 LD
W92MASTER OAFA Obs., 1 in MPEC 2017-L56 -- 1036
118Modra Obs. in Slovakia, 2 in MPEC 2017-L56 -- 2017 CS, 2329
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2017-L56 -- 242191, 141447
G403Tony Evans in Portugal via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-L56 -- 418094
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-L56 -- 2017 LD
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-L56 -- 2017 FE1, 469219
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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 LDNEODyS20302045-21176952.51e-03-4.03-4.450NEODyS: "Based on 86 optical observations (of which 0 are rejected as outliers) from 2017-05-16.299 to 2017-06-10.446."
JPL Sentry16182045-21165690.011104363903-3.21-3.250JPL: Computed at 09:13 today Pacific time based on 86 observations spanning 25.147 days (2017-May-16.298488 to 2017-Jun-10.445002). Diameter approximately 0.010 km. from weighted mean H=27.63.

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 10 June '17

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

2030Noted that NEODyS has updated its 2017 LD risk assessment - see above
1910Generated Traffic Report
1618Noted that JPL Sentry has updated its 2017 LD risk assessment - see above
Grabbed MPEC 2017-L56 - Daily Orbit Update - see above