Contents  on 7 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 7 June '17

Five objects reported inside ten LD

Today there are five minor objects reported to be less than ten lunar distances (LD) Earth, all of them now moving away from us. Nearest is risk-listed 2017 KQ27, which leaves Earth's SOI (sphere of gravitational influence), traveling from 1.36 to 3.45 LD.

Earth passage I D ~Size Distance Today  Notes
1.02 LD yesterday2017 KQ27 23 m  1.36 to 3.45 LD exits Earth SOI, risk
1.90 LD May 242017 KJ32 6 m  7.69 to 8.22 LD risk
3.00 LD June 52017 LD 9 m  3.43 to 4.06 LD risk
5.18 LD today2017 LE 18 m  5.18 LD Earth closest at 0155 UTC - DOU
7.00 LD yesterday2017 KR27 69 m  7.40 to 8.74 LD DOU

This report was generated at 2018 UTC with follow-up in today's DOU MPEC for 2017 LE, 2017 KR27, and for departed radar targets 2017 CS and 418094 2007 WV4 as well as 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 during the ten-plus years that we have done these traffic reports but is not currently coming 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 7 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, two were "one nighters."

New MPECs  on 7 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 7 June '17 >>  MPEC 2017-L53 - "12:01 UT" - Daily Orbit Update

Observers  on 7 June '17

Thirteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2017-L53 -- 2017 HY50, 2017 GQ6, 66391, 222073, 190166, 141056, 7888
T05ATLAS Haleakala in Hawaii, 6 in MPEC 2017-L53 -- 66391, 456651, 418094, 329774, 142561, 11398
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2017-L53 -- 2017 HW48, 190166, 4954, 1917
V04FRoST in Arizona, 3 in MPEC 2017-L53 -- 143404, 11398, 2329
J95Great Shefford Obs. in England, 2 in MPEC 2017-L53 -- 2017 LE, 2017 KR27
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-L53 -- 2017 KU34
Z22MASTER IAC Obs. in the Canary Islands, 2 in MPEC 2017-L53 -- 54789, 1036
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2017-L53 -- 486607, 484402
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 12 in MPEC 2017-L53 -- 2017 HW48, 2017 CS, 2011 ED78, 66391, 418094, 416584, 190166, 142040, 11398, 7888, 6063, 1917
L04ROASTERR-1 in Romania, 1 in MPEC 2017-L53 -- 488803
926Tenagra II Obs. in Arizona, 2 in MPEC 2017-L53 -- 418094, 416584
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-L53 -- 2008 JV2
Z92West Park Obs. in England, 1 in MPEC 2017-L53 -- 2017 CS
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 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 LDNEODyS15482045-21174751.94e-03-4.10-4.170NEODyS: "Based on 71 optical observations (of which 0 are rejected as outliers) from 2017-06-02.203 to 2017-06-06.373."
2017 KQ27NEODyS1548211719.37e-07-6.75-6.750NEODyS: "Based on 60 optical observations (of which 1 are rejected as outliers) from 2017-05-25.305 to 2017-06-05.173."
2007 VH189JPL Sentry18052037-204552.819e-08-6.25-6.690JPL: Computed at 03:24 April 7th Pacific time based on 23 observations spanning 5.8502 days (2007-Nov-14.35096 to 2007-Nov-20.20114). Diameter approximately 0.073 km. from weighted mean H=23.35.

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 7 June '17

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

2018Generated Traffic Report
1805Noted that JPL Sentry has updated its 2007 VH189 risk assessment - see above
1548Noted that NEODyS has updated its 2017 KQ27 risk assessment - see above
Noted that NEODyS has updated its 2017 LD risk assessment - see above
Grabbed MPEC 2017-L53 - Daily Orbit Update - see above