Contents  on 6 June '19

Asteroid/Comet Connection (A/CC) Resources:

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Traffic Report  on 6 June '19

Eight objects reported inside ten LD

There are eight asteroids reported to be less than ten lunar distances (LD) from Earth today. Nearest is 2019 KA3, which comes its closest this time around -- 3.94 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
3.77 LD June 3 2012 KZ41 32 m  6.61 to 8.97 LD May 31 - tomorrow
3.82 LD June 1 2019 LB1 13 m  5.51 to 6.24 LD May 23 - June 11
3.94 LD today 2019 KA3 8 m  3.94 LD May 26 - June 16 NHATS target, Earth closest at 0324 UTC
5.46 LD June 3 2019 LQ1 21 m  7.60 to 8.94 LD May 29 - tomorrow
5.49 LD June 4 2019 KY 18 m  5.88 to 6.51 LD May 29 - June 10 NHATS target
5.64 LD tomorrow 2019 KZ3 49 m  6.00 from 7.09 LD June 4 - 11
6.70 LD May 30 2019 KJ4 12 m  9.52 to 10.26 LD May 23 - today NHATS target, exits ten LD, risk
8.38 LD yesterday 2019 KA4 22 m  8.46 to 8.83 LD June 1 - 8

This report was generated at 1810 UTC. At last check no DOU MPEC or explanation has been issued today. We should note that 2014 MF18 may or may not be in the neighborhood. NASA/JPL's best calculation has it passing our planet at about 8.8 LD today, but with an uncertainty of more than plus-or-minus 3.21 days, based on 25 days of observation ending in July 2014.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.09 LD June 12 2019 LB 31 m  11.92 from 12.87 LD June 9 - 15 NHATS target
6.4   LD June 20* 2019 LB2 14 m  11.7 from 12.3 LD June 9 - 30 EPU +/- 13 mins.*
5.6   LD June 14* 2019 LL1 15 m  16.0 from 17.9 LD June 10 - 18 EPU +/- 6 mins.*
4.1   LD June 16* 2019 LU 33 m  17.5 from 19.3 LD June 11 - 21 EPU +/- 10 mins.*
9.7   LD June 23* 2019 LM1 24 m  33.4 from 35.4 LD June 21 - 24 EPU +/- 15 mins.*
5.2   LD June 29* 2019 LV1 23 m  32.9 from 34.4 LD June 23 - July 6 EPU +/- 2.58 hours*
* EPU = Earth passage uncertainty

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's 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 temporal 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 6 June '19

The MPC's NEO Confirmation Page has 112 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 112 objects listed. Of these, 21 were "one nighters." So far The Tracking News has counted a total of 114 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 6 June '19

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been no MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

When no Daily Orbit Update (DOU) MPEC has been posted by this time of day, visit the MPC Status Page for possible explanation.

Observers  on 6 June '19

Without MPECs with observations to report, we have no observers to list yet today. For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 June '19

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 and NEODyS listings is 100 years, and both post impact solutions beyond that for some 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
2019 LZ1NEODyS1533208011.49e-09-5.79-5.790NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2019-05-31.171 to 2019-06-05.157."

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 6 June '19

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

1810Generated Traffic Report
1533Noted that NEODyS has posted 2019 LZ1 as an impact risk - see above