Contents  on 18 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 18 May '19

Eight objects reported inside ten LD

There are eight asteroids known to be within ten lunar distances (LD) of our home world today. Nearest is 2019 JL3, which moves in from 5.18 to 3.58 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
0.19 LD May 16 2019 JH7 4 m  4.10 to 6.14 LD May 11 - 20 intruder, NHATS target, risk
2.48 LD May 20 2019 JL3 36 m  3.58 from 5.18 LD May 15 - 25 DOU
4.14 LD yesterday 2012 KT12 19 m  4.16 to 4.32 LD May 7 - 27 NHATS target
4.43 LD May 16 2019 JN5 27 m  7.36 to 9.87 LD May 12 - 19
4.69 LD April 27 2019 GF1 10 m  9.51 to 9.87 LD April 7 - tomorrow NHATS target
5.56 LD yesterday 2019 JG1 16 m  5.80 to 6.56 LD May 12 - 21 NHATS target
6.09 LD yesterday 2019 GT1 34 m  6.09 to 6.16 LD May 8 - 26 NHATS target
7.04 LD May 15 2019 JN2 25 m  8.30 to 9.20 LD May 10 - 19 NHATS target

This report was generated at 1840 UTC with the January/March recovery of distant 2017 MC4 (MPEC) and with follow-up in today's DOU MPEC for inbound 2019 JL3, departed 2018 VX8, and distant 68216 2001 CV26, along with astrometry from 2016 for 2015 VC2 (40 days added to 149-day observation arc) and risk-listed 2016 JA (6.01 days added to 10.06).

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 approached Earth within ten LD since A/CC began these traffic reports twelve years ago but are not presently coming 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 18 May '19

The MPC's NEO Confirmation Page has 46 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 46 objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of 49 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 18 May '19

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 18 May '19 >>  MPEC 2019-K06 - "12:27 UT" - Daily Orbit Update

MPEC 2019-K05 - "04:23 UT" - 2017 MC4

Observers  on 18 May '19

Eleven observers appear in today's MPECs.

CodeObserver / observatory
J57Alto Turia Obs. in Spain, 1 in MPEC 2019-K06 -- 112221
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2019-K06 -- 2019 HC, 2018 XG5, 2015 QO3, 2014 LJ21, 2011 OL5, 2008 WX32
160Castelmartini Obs. in Italy, 10 in MPEC 2019-K06 -- 2019 JL3, 2018 XG5, 90367, 68216, 381906, 163696, 162181, 6178, 5189, 3103
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2019-K06 -- 2018 VX8
108Montelupo Obs. in Italy, 1 in MPEC 2019-K06 -- 2019 HC
628Mulheim-Ruhr Obs. in Germany, 1 in MPEC 2019-K06 -- 5879
Z80Northolt Branch Obs. in England, 5 in MPEC 2019-K06 -- 2019 JB1, 2019 HC, 2018 XG5, 2011 UA131, 2008 HS3
K80Platanus Obs., 1 in MPEC 2019-K06 -- 2019 HC
C95SATINO-1 in France, 2 in MPEC 2019-K06 -- 2015 FV118, 2014 QX266
A16Tentlingen Obs. in Switzerland, 3 in MPEC 2019-K06 -- 68216, 355256, 12538
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPECs 2019-K05 & 2019-K06 -- 2017 MC4, 2016 JV5, 2016 JA, 2015 VC2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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
2016 JAJPL Sentry16202064-208934.06092e-08-8.85-9.110JPL: Computed at 08:08 today Pacific time based on 51 observations spanning 16.071 days (2016-May-01.32646 to 2016-May-17.397701). Diameter approximately 0.011 km. from weighted mean H=27.51.
NEODyS16202074-2118131.88e-07-8.36-8.670NEODyS: "Based on 51 optical observations (of which 0 are rejected as outliers) from 2016-05-01.327 to 2016-05-17.398."

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 18 May '19

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

1840Generated Traffic Report
1620Noted that JPL Sentry has updated its 2016 JA risk assessment - see above
Noted that NEODyS has updated its 2016 JA risk assessment - see above
Grabbed MPEC 2019-K06 - Daily Orbit Update - see above
0544Grabbed MPEC 2019-K05 - 2017 MC4 - see above