Contents  on 30 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 30 June '17

Five objects reported inside ten LD

There are five minor objects reported inside ten lunar distances (LD) of Earth today. Nearest is 2017 MC1, which comes its closest to our planet on this passage, reaching 2.52 LD at 2124 UTC.

Earth passage I D ~Size Distance Today  Notes
2.52 LD today2017 MC1 42 m  2.52 LD Earth closest at 2124 UTC
3.23 LD June 272017 MA3 15 m  6.45 to 8.31 LD
4.99 LD today2017 MB3 29 m  4.99 LD Earth closest at 1641 UTC - DOU
5.38 LD July 32017 ME4 19 m  6.67 from 7.66 LD
6.51 LD July 22017 MC3 52 m  8.75 from 10.96 LD enters ten LD - DOU
3.12 LD July 232017 BS5 51 m  < 10 LD July 16, NHATS target
7.6   LD July 112017 MC4 147 m  < 10 LD July 9, uncertainty +/- 37 mins.

This report was generated at 1753 UTC with follow-up in today's DOU MPEC for two objects in the active traffic table here, and for departed 2017 MD, as well as astrometry from early June for 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 30 June '17

The MPC's NEO Confirmation Page has 70 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 70 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 72 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 30 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 30 June '17 >>  MPEC 2017-M96 - "12:00 UT" - Daily Orbit Update

Observers  on 30 June '17

Seven observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 24 in MPEC 2017-M96 -- 2017 MZ, 2017 MK, 2017 MJ, 2017 MD, 2017 MA, 2017 LW, 2017 HN3, 2017 GQ6, 2017 CS, 2017 BM31, 2013 UH9, 494706, 365246, 332408, 285838, 244670, 190166, 162120, 142561, 142040, 11398, 7888, 6063, 1980
T08ATLAS Mauna Loa in Hawaii, 7 in MPEC 2017-M96 -- 2017 BM31, 66391, 333908, 332408, 329774, 222073, 138925
703Catalina Sky Survey (CSS) in Arizona, 7 in MPEC 2017-M96 -- 2017 MB3, 2017 BM31, 66391, 53430, 456651, 413563, 332408
W885M. Kumrucu-Lohmiller in Massachusetts via Chile Obs. in Chile, 1 in MPEC 2017-M96 -- 2007 XJ16
691Spacewatch 0.9m telescope in Arizona, 8 in MPEC 2017-M96 -- 2017 MY3, 2017 MW4, 2017 MV2, 2017 MC3, 2017 MB1, 2017 MA4, 2017 HV4, 2015 FO124
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2017-M96 -- 2017 MZ3, 2014 LU14
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-M96 -- 2014 QL390
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 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 MZ3NEODyS16002029-2116365.55e-06-3.72-3.940NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2017-06-22.507 to 2017-06-30.349."
JPL Sentry15312029-2116278.8767955e-06-3.36-3.590JPL: Computed at 08:04 today Pacific time based on 19 observations spanning 7.8419 days (2017-Jun-22.50604 to 2017-Jun-30.34795). Diameter approximately 0.120 km. from weighted mean H=22.26.
2017 MY3NEODyS1600206611.15e-10-7.46-7.460NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2017-06-21.563 to 2017-06-29.452."
2017 MB1NEODyS16002089-209421.74e-09-5.59-5.70NEODyS: "Based on 106 optical observations (of which 1 are rejected as outliers) from 2017-06-19.315 to 2017-06-30.401."
JPL Sentry15312082-211757.8923e-08-3.96-4.250JPL: Computed at 07:51 today Pacific time based on 106 observations spanning 11.086 days (2017-Jun-19.31418 to 2017-Jun-30.40005). Diameter approximately 0.625 km. from weighted mean H=18.66.

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 30 June '17

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

1753Generated Traffic Report
1600Noted that NEODyS has updated its 2017 MB1 risk assessment - see above
Noted that NEODyS has posted 2017 MY3 as an impact risk - see above
Noted that NEODyS has updated its 2017 MZ3 risk assessment - see above
1531Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 MZ3 risk assessment - see above
1401Grabbed MPEC 2017-M96 - Daily Orbit Update - see above