Contents  on 16 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 16 June '17

Two objects reported inside ten LD

There are two visitors reported moving inside ten lunar distances (LD) of our planet today. 2017 LX comes its closest to Earth this time around, reaching 2.74 LD at 0801 UTC, and 2017 LV is inbound from 9.20 to 7.79 LD (updated at 2218 UTC with new data). Up next, radar target 441987 2010 NY65 comes within ten LD on June 22nd and NHATS target 2017 BS5 enters on July 16th.

This report was generated at 2016 UTC with the recovery of distant 2016 LB announced yesterday (MPEC), and with follow-up in today's DOU MPEC for 2017 LX, 2017 LV, and departed radar targets 2017 CS and 418094 2007 WV4, plus astrometry from last month for radar target 2017 BQ6.

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 16 June '17

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, three were "one nighters." So far The Tracking News has counted a total of fourteen 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 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 16 June '17 >>  MPEC 2017-M01 - "11:59 UT" - Daily Orbit Update

Observers  on 16 June '17

Fourteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPEC 2017-M01 -- 2017 KT4, 2017 KE5, 2017 HY50, 2017 HW48, 2017 HN3, 2017 GQ6, 2017 DS35, 2017 CS, 2017 BQ6, 2016 YU8, 2016 LE51, 2015 ME54, 2013 BR45, 66391, 494713, 494706, 222073, 190166, 142561, 142040, 141447, 11398, 106589, 7888, 6063, 4596, 2102, 1980
T08ATLAS Mauna Loa in Hawaii, 11 in MPEC 2017-M01 -- 2017 HW48, 68348, 52750, 495331, 20460, 190166, 100926, 6063, 5653, 4341, 1980
160Castelmartini Obs. in Italy, 3 in MPEC 2017-M01 -- 68950, 141056, 106589
703Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2017-M01 -- 66391, 456651, 418094, 222073, 11398
006Fabra Obs. in Spain, 1 in MPEC 2017-M01 -- 2102
J95Great Shefford Obs. in England, 1 in MPEC 2017-M01 -- 2017 LX
Z43Landehen Obs., 3 in MPEC 2017-M01 -- 66391, 190166, 11398
L04ROASTERR-1 in Romania, 1 in MPEC 2017-M01 -- 494706
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2017-M01 -- 2017 LA, 2017 KV4, 2017 KD3, 2012 QB17, 437841
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2017-M01 -- 2017 HQ49, 2017 HK49, 2017 FU158, 2016 SG1, 2015 FO124
I66Taurus Australis Obs. in Brazil, 1 in MPEC 2017-M01 -- 6063
926Tenagra II Obs. in Arizona, 3 in MPEC 2017-M01 -- 2017 LX, 2017 LV, 2017 LC
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-M01 -- 326354
C51WISE in Earth polar orbit, 3 in MPEC 2017-M01 -- 52762, 164120, 163696
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 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
2012 TC4NEODyS15012020-2116886.57e-05-4.96-5.760NEODyS: "Based on 314 optical observations (of which 0 are rejected as outliers) from 2012-10-04.468 to 2012-10-11.749."

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 June '17

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

2016Generated Traffic Report
1501Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Grabbed MPEC 2017-M01 - Daily Orbit Update - see above