Contents  on 20 May '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 20 May '19

Five objects reported inside ten LD

There are five minor planets reported within ten lunar distances (LD) of our home world today. Nearest is 2019 JL3, which comes its closest to Earth this time around, reaching 2.48 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
0.19 LD May 16 2019 JH7 4 m  8.19 to 10.24 LD May 11 - 20 intruder, NHATS target, exits ten LD, risk
2.48 LD today 2019 JL3 36 m  2.48 LD May 15 - 25 Earth closest at 0732 UTC - DOU
4.14 LD May 17 2012 KT12 19 m  4.65 to 5.12 LD May 7 - 27 NHATS target
5.56 LD May 17 2019 JG1 16 m  7.67 to 9.02 LD May 12 - 21 NHATS target
6.09 LD May 17 2019 GT1 34 m  6.35 to 6.65 LD May 8 - 26 NHATS target

This report was generated at 1810 UTC with follow-up in today's DOU MPEC for outbound 2019 JL3 and for departed risk-listed objects 2019 JO1 (first follow-up, 6.25 days added to 1.95-day discovery arc) and 2019 GS19, .

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 20 May '19

The MPC's NEO Confirmation Page has 43 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 43 objects listed. Of these, one was a "one nighter." So far The Tracking News has counted a total of 44 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 20 May '19

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 20 May '19 >>  MPEC 2019-K09 - "12:31 UT" - Daily Orbit Update

Observers  on 20 May '19

Four observers appear in today's MPEC.

CodeObserver / observatory
160Castelmartini Obs. in Italy, 2 in MPEC 2019-K09 -- 2019 JL3, 2019 HC
E89Geyserland Obs. in New Zealand, 3 in MPEC 2019-K09 -- 153814, 141593, 5693
C95SATINO-1 in France, 1 in MPEC 2019-K09 -- 2015 QO3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2019-K09 -- 2019 JO1, 2019 GS19
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 May '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 JO1JPL Sentry16002044-205263.3883107e-05-5.17-5.200JPL: Computed at 08:08 today Pacific time based on 23 observations spanning 8.1949 days (2019-May-02.32636 to 2019-May-10.521282). Diameter approximately 0.012 km. from weighted mean H=27.25.
NEODyS16002044-205381.36e-06-6.58-6.610NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2019-05-02.327 to 2019-05-10.522."
2019 GS19JPL Sentry16002102-210219.455e-08-7.49-7.490JPL: Computed at 07:59 today Pacific time based on 62 observations spanning 29.075 days (2019-Apr-11.38728 to 2019-May-10.461894). Diameter approximately 0.025 km. from weighted mean H=25.64.
NEODyS16002069-210232.84e-07-6.95-7.060NEODyS: "Based on 64 optical observations (of which 5 are rejected as outliers) from 2019-04-11.388 to 2019-05-10.463."
2006 QV89JPL Sentry23002019-2117150.000154262101-1.91-1.910JPL: Computed at 15:10 today Pacific time based on 62 observations spanning 9.8617 days (2006-Aug-29.30747 to 2006-Sep-08.16918) including radar (1 Doppler).. Diameter approximately 0.030 km. from weighted mean H=25.23.

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 20 May '19

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

2300Noted that JPL Sentry has updated its 2006 QV89 risk assessment - see above
1810Generated Traffic Report
1600Noted that JPL Sentry has updated its 2019 GS19 risk assessment - see above
Noted that NEODyS has updated its 2019 GS19 risk assessment - see above
Noted that JPL Sentry has updated its 2019 JO1 risk assessment - see above
Noted that NEODyS has updated its 2019 JO1 risk assessment - see above
Grabbed MPEC 2019-K09 - Daily Orbit Update - see above