Contents  on 17 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 17 May '19

Ten objects reported inside ten LD

There are ten minor objects reported inside ten lunar distances (LD) of our home world today. The closest are risk-listed intruder 2019 JH7, which exits Earth's sphere of gravitational influence as it travels outward from 2.06 to 4.10 LD, and 2012 KT12, which comes its closest to Earth this time around -- 4.14 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
0.19 LD yesterday 2019 JH7 4 m  2.06 to 4.10 LD May 11 - 20 intruder, NHATS target, exits Earth SOI, risk
2.34 LD May 13 2019 JW5 12 m  8.16 to 10.66 LD May 10 - 17 exits ten LD
2.48 LD May 20 2019 JL3 36 m  5.18 from 6.97 LD May 15 - 25
3.15 LD May 13 2019 JK3 15 m  8.02 to 10.26 LD May 9 - 17 exits ten LD
4.14 LD today 2012 KT12 19 m  4.14 LD May 7 - 27 NHATS target, Earth closest at 1440 UTC
4.43 LD yesterday 2019 JN5 27 m  5.31 to 7.36 LD May 12 - 19
4.69 LD April 27 2019 GF1 10 m  9.15 to 9.51 LD April 7 - May 19 NHATS target
5.56 LD today 2019 JG1 16 m  5.56 LD May 12 - 21 NHATS target, Earth closest at 0154 UTC
6.09 LD today 2019 GT1 34 m  6.09 LD May 8 - 26 NHATS target, Earth closest at 2338 UTC
7.04 LD May 15 2019 JN2 25 m  7.61 to 8.30 LD May 10 - 19 NHATS target

This report was generated at 1720 UTC.

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 17 May '19

The MPC's NEO Confirmation Page has 48 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 48 objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 53 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 17 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 17 May '19 >>  MPEC 2019-K04 - "12:28 UT" - Daily Orbit Update

Observers  on 17 May '19

One observer appears in today's MPEC.

CodeObserver / observatory
J95Great Shefford Obs. in England, 1 in MPEC 2019-K04 -- 2006 QV89
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 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
2006 QV89JPL Sentry16302019-2117150.000169674383-1.93-1.930JPL: Computed at 09:10 today Pacific time based on 69 observations spanning 9.8617 days (2006-Aug-29.30747 to 2006-Sep-08.16918) including radar (1 Doppler).. Diameter approximately 0.029 km. from weighted mean H=25.32.
NEODyS16302019-2117201.06e-04-3.74-3.750NEODyS: "Based on 70 optical observations (of which 0 are rejected as outliers) from 2006-08-29.308 to 2006-09-08.170."

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 17 May '19

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

1720Generated Traffic Report
1630Noted that JPL Sentry has updated its 2006 QV89 risk assessment - see above
Noted that NEODyS has updated its 2006 QV89 risk assessment - see above
1600Grabbed MPEC 2019-K04 - Daily Orbit Update - see above