Contents  on 11 June '19

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 11 June '19

Seven objects reported inside ten LD

Seven transient natural objects have been reported inside ten lunar distances (LD) of Earth today. Of these, 2019 KA3 is the nearest and moves out from 5.74 to 6.38 LD. Quite likely there are other close-passing objects in the neighborhood that will be revealed once the Minor Planet Center resumes announcing discoveries (click on the left arrow immediately above to see our previous two traffic reports for more about that).

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
3.82 LD June 1 2019 LB1 13 m  9.61 to 10.51 LD May 23 - today NHATS target, exits ten LD
3.94 LD June 6 2019 KA3 8 m  5.74 to 6.38 LD May 26 - June 16 NHATS target
4.1   LD June 16* 2019 LU 33 m  9.0 from 10.7 LD today - June 21 EPU +/- 10 mins.*, enters ten LD
5.6   LD June 14* 2019 LL1 15 m  7.5 from 8.9 LD yesterday - June 18 EPU +/- 6 mins.*
5.64 LD June 7 2019 KZ3 48 m  8.96 to 10.79 LD June 4 - 11 exits ten LD - DOU
6.4   LD June 20* 2019 LB2 14 m  8.8 from 9.3 LD June 9 - 30 EPU +/- 13 mins.*, NHATS target
9.09 LD tomorrow 2019 LB 31 m  9.13 from 9.35 LD June 9 - 15 NHATS target - DOU
Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.7   LD June 23* 2019 LM1 24 m  23.9 from 25.7 LD June 21 - 24 EPU +/- 15 mins.*
7.63 LD June 24 441987 2010 NY65 170 m  37.53 from 40.47 LD June 22 - 26 radar target
5.2   LD June 29* 2019 LV1 23 m  25.7 from 27.1 LD June 23 - July 6 EPU +/- 2.58 hours*, NHATS target
* EPU = Earth passage uncertainty

This report was generated at 0422 UTC to give credit to observations posted in the DOU MPEC yesterday -- the first MPEC issued since June 5th. It reported the recovery of distant 2018 UQ1 and follow-up for inbound 2019 LB, outbound 2019 KZ3, departed risk-listed 2019 KJ4, six other departed objects: 2019 KA4, 2019 KK3, 2019 KL2, 2019 KY, 2019 JD6, and 2019 HM, as well as distant 68347 2001 KB67, plus astrometry from March and May for 2019 KN, 2019 JL3, and 2019 DB.



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. "Distant" is used here to describe objects that have come within ten LD since A/CC began this traffic reporting (2007) but are not currently so close. 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 11 June '19

The MPC's NEO Confirmation Page has 201 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 201 objects listed. Of these, 32 were "one nighters." So far The Tracking News has counted a total of 204 listings on the NEOCP today.

New MPECs  on 11 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 11 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 11 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2019 KJ4NEODyS16552059-21181938.59e-05-5.52-6.480NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2019-05-31.320 to 2019-06-08.263."
2019 JR7NEODyS1655206718.59e-09-6.49-6.490NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2019-05-07.926 to 2019-06-05.582."
2015 BP566NEODyS1655R E M O V E D-

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 11 June '19

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

1655Noted that NEODyS has removed 2015 BP566 as an impact risk - see above
Noted that NEODyS has updated its 2019 JR7 risk assessment - see above
Noted that NEODyS has updated its 2019 KJ4 risk assessment - see above
0422Generated Traffic Report