Contents  on 4 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 4 June '19

Nine objects reported inside ten LD

Nine minor planets are reported inside ten lunar distances (LD) of Earth today. Nearest are 2012 KZ41, outbound from 3.77 to 4.65 LD, and 2019 KA3, inbound from 4.36 to 4.06 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
2.28 LD June 2 2019 KY3 17 m  6.89 to 10.42 LD May 30 - today exits ten LD, risk
3.77 LD yesterday 2012 KZ41 32 m  3.77 to 4.65 LD May 31 - June 7
3.94 LD June 6 2019 KA3 8 m  4.06 from 4.36 LD May 26 - June 16 NHATS target
5.49 LD today 2019 KY 18 m  5.49 LD May 29 - June 10 NHATS target, Earth closest at 1137 UTC
5.65 LD June 7 2019 KZ3 49 m  8.64 from 10.45 LD today - June 11 enters ten LD - DOU
6.70 LD May 30 2019 KJ4 13 m  8.20 to 8.83 LD May 23 - June 6 NHATS target, risk - DOU
7.02 LD May 29 2019 KV 20 m  9.81 to 10.72 LD May 23 - today NHATS target, exits ten LD
8.38 LD tomorrow 2019 KA4 21 m  8.39 from 8.62 LD June 1 - 8 DOU
8.7   LD June 1* 2019 KL2 11 m  9.2 to 9.6 LD May 27 - tomorrow EPU +/- 8 mins.*, NHATS target
Approaching - sorted by 10-LD bubble entry date
9.10 LD June 12 2019 LB 31 m  13.89 from 14.97 LD June 9 - 15 NHATS target
4.1   LD June 16* 2019 LU 33 m  21.0 from 22.8 LD June 11 - 21 EPU +/- 10 mins.* - DOU
* EPU = Earth passage uncertainty

This report was generated at 1940 UTC with follow-up in today's DOU MPEC for approaching 2019 LU, inbound 2019 KA4 and 2019 KZ3, outbound 2019 KJ4, and departed objects 2019 KK3, 2019 JH8, and 2019 GT1, plus distant 357439 2004 BL86.



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 4 June '19

The MPC's NEO Confirmation Page has 137 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 137 objects listed. Of these, 31 were "one nighters." So far The Tracking News has counted a total of 145 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 4 June '19

Minor Planet Electronic Circulars

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


MPEC 2019-L48 - "15:38 UT" - 2005 UJ1


<< DOU on 4 June '19 >>  MPEC 2019-L47 - "12:06 UT" - Daily Orbit Update


MPEC 2019-L46 - "11:43 UT" - 2010 GS7


MPEC 2019-L45 - "11:34 UT" - 2016 AD193


MPEC 2019-L44 - "11:28 UT" - 2012 DT32

Observers  on 4 June '19

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPEC 2019-L47 -- 2018 XG5, 2014 YV43, 530520, 357439
160Castelmartini Obs. in Italy, 11 in MPEC 2019-L47 -- 2011 LH, 2006 KE, 455736, 453778, 408869, 257744, 244670, 163696, 162181, 142040, 3103
703Catalina Sky Survey (CSS) in Arizona, 14 in MPEC 2019-L47 -- 530531, 491567, 489486, 441825, 427643, 418900, 267759, 231134, 188174, 173561, 137170, 12538, 112221, 7889
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 3 in MPEC 2019-L47 -- 2019 KE1, 2019 JB7, 2012 VF80
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2019-L47 -- 2019 JM1
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2019-L47 -- 2019 LU, 2019 KB2
L05Dridri Obs. in Italy, 1 in MPEC 2019-L47 -- 68950
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2019-L47 -- 2019 KF2
157Frasso Sabino Obs. in Italy, 1 in MPEC 2019-L47 -- 2019 GD3
L34Galhassin Robotic Telescope, 2 in MPEC 2019-L47 -- 2018 JB3, 66391
246KLENOT in the Czech Republic, 2 in MPEC 2019-L47 -- 2019 KZ3, 2019 JX7
Z43Landehen Obs., 1 in MPEC 2019-L47 -- 12538
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2019-L47 -- 2019 LX
C23Olmen Obs. in Belgium, 1 in MPEC 2019-L47 -- 66391
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2019-L44, 2019-L45, 2019-L47 & 2019-L48 -- 2016 AD193, 2012 DT32, 2005 UJ1, 435138, 141531
F52Pan-STARRS 2 (PS2) in Hawaii, 4 in MPEC 2019-L47 -- 499496, 348776, 275975, 257838
L18QOS Obs., 1 in MPEC 2019-L47 -- 66391
C95SATINO-1 in France, 1 in MPEC 2019-L47 -- 2015 XC1
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-L47 -- 2011 LH
G40-program code "-" (22) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-L47 -- 2019 JX7
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2019-L47 -- 2019 KC, 2019 KB4, 2019 JX7, 2019 JP2, 2019 JA1, 2015 QO3
I52Steward Obs. Mt. Lemmon Station in Arizona, 13 in MPEC 2019-L47 -- 2019 LC, 2019 KW3, 2019 KS, 2019 KK3, 2019 KJ4, 2019 KJ3, 2019 KG3, 2019 KD2, 2019 KB4, 2019 KA4, 2019 JH8, 2019 GT1, 2015 NW9
A16Tentlingen Obs. in Switzerland, 1 in MPEC 2019-L47 -- 66391
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2019-L46 -- 2010 GS7
C51WISE in Earth polar orbit, 3 in MPEC 2019-L47 -- 2019 KK2, 2019 KB2, 530531
I15Wishing Star Obs. in Rhode Island, 6 in MPEC 2019-L47 -- 2019 KZ3, 2019 GD3, 87025, 408869, 12538, 112221
I41Zwicky Transient Facility (ZTF) in southern California, 13 in MPEC 2019-L47 -- 2019 HC, 2012 SB22, 533671, 455736, 441825, 417581, 18736, 185716, 137170, 112221, 7889, 1917, 1036
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 KJ4JPL Sentry16502059-2119878.31918064e-05-5.37-6.040JPL: Computed at 07:32 today Pacific time based on 18 observations spanning 3.8675 days (2019-May-31.318726 to 2019-Jun-04.18626). Diameter approximately 0.013 km. from weighted mean H=27.09.
NEODyS16502059-21181809.61e-05-5.37-5.950NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2019-05-31.320 to 2019-06-04.187."
2019 KCNEODyS1650R E M O V E D-
2014 LY21JPL Sentry16502019-21169748.59827570999998e-05-5.32-5.740JPL: Computed at 18:09 April 8th of 2017 Pacific time based on 11 observations spanning .04506 days (2014-Jun-02.41612 to 2014-Jun-02.46118). Diameter approximately 0.005 km. from weighted mean H=29.25.

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 4 June '19

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

1940Generated Traffic Report
1650Noted that JPL Sentry has updated its 2014 LY21 risk assessment - see above
Noted that NEODyS has removed 2019 KC as an impact risk - see above
Noted that JPL Sentry has updated its 2019 KJ4 risk assessment - see above
Noted that NEODyS has updated its 2019 KJ4 risk assessment - see above
Grabbed MPEC 2019-L44 - 2012 DT32 - see above
Grabbed MPEC 2019-L45 - 2016 AD193 - see above
Grabbed MPEC 2019-L46 - 2010 GS7 - see above
Grabbed MPEC 2019-L47 - Daily Orbit Update - see above
Grabbed MPEC 2019-L48 - 2005 UJ1 - see above