Contents  on 25 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 25 May '19

Three objects reported inside ten LD

There are three minor objects known to be less than ten lunar distances (LD) from Earth today. All are retreating, with none closer than 7.74 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
2.48 LD May 20 2019 JL3 36 m  9.55 to 11.46 LD May 15 - 25 exits ten LD
4.14 LD May 17 2012 KT12 19 m  7.74 to 8.49 LD May 7 - 27 NHATS target
6.09 LD May 17 2019 GT1 34 m  8.70 to 9.35 LD May 8 - 26 NHATS target

This report was generated at 1810 UTC with follow-up in today's DOU MPEC for departed 2019 JU5 and distant 2018 LK, plus astrometry from April and early May for 2019 GJ4 (13.12 days added to previous 19.12-day observation arc), 2019 GM4, and risk-listed 2019 JR2.
        We also note a couple of other passages today. Large binary 66391 (1999 KW4) flies by us at 13.48 LD (see and unrecovered 2015 KQ18 is calculated with some uncertainty to be passing at about 10.7 LD.

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 an object that has come within ten LD since A/CC began this traffic reporting (2007) but is not now 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 25 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, 22 were "one nighters." So far The Tracking News has counted a total of 47 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 25 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.

MPEC 2019-K37 - "14:20 UT" - Comet C/2019 K1 (ATLAS)

<< DOU on 25 May '19 >>  MPEC 2019-K36 - "12:02 UT" - Daily Orbit Update

Observers  on 25 May '19

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
705$program code "$" (13) via Apache Point Obs. in New Mexico, 1 in MPEC 2019-K37 -- C/2019 K1
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2019-K37 -- C/2019 K1
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2019-K37 -- C/2019 K1
215Buchloe Obs. in Germany, 1 in MPEC 2019-K37 -- C/2019 K1
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2019-K37 -- C/2019 K1
E89Geyserland Obs. in New Zealand, 1 in MPEC 2019-K36 -- 3199
0895N.V. Maigurova via Nikolaev Obs. in Ukraine, 4 in MPEC 2019-K36 -- 396593, 184990, 152931, 112221
F52Pan-STARRS 2 (PS2) in Hawaii, 2 in MPEC 2019-K36 -- 533990, 141593
K80Platanus Obs., 1 in MPEC 2019-K36 -- 2019 GM4
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2019-K36 -- 524498, 416186, 142040
C95SATINO-1 in France, 1 in MPEC 2019-K36 -- 2000 GV127
G40)program code ")" (18) via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-K36 -- 2011 HP
G409B. Lutkenhoner in Germany via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-K37 -- C/2019 K1
W883B. Lutkenhoner in Germany via Chile Obs. in Chile, 1 in MPEC 2019-K37 -- C/2019 K1
691Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2019-K36 -- 2019 JX6, 2019 JU5, 2019 JP3, 2019 JK1, 2019 HG4, 2019 AH11, 534676, 396593, 350523
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2019-K36 -- 2019 HH4, 2018 LK, 2016 NN39, 2016 JJ24, 2008 SR1, 350523
I52Steward Obs. Mt. Lemmon Station in Arizona, 8 in MPEC 2019-K36 -- 2019 JX6, 2019 JW2, 2018 XG5, 2018 XE5, 2018 VM3, 2015 HV171, 2013 KJ6, 2012 KA4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2019-K36 -- 2019 JR2, 2019 GJ4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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 JR2JPL Sentry15552079-2118142.20231e-05-5.85-5.970JPL: Computed at 07:11 today Pacific time based on 29 observations spanning 5.8123 days (2019-May-04.31798 to 2019-May-10.13025). Diameter approximately 0.013 km. from weighted mean H=27.05.

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 25 May '19

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

1810Generated Traffic Report
1555Noted that JPL Sentry has updated its 2019 JR2 risk assessment - see above
Grabbed MPEC 2019-K36 - Daily Orbit Update - see above
Grabbed MPEC 2019-K37 - Comet C/2019 K1 (ATLAS) - see above