Contents  on 1 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 1 June '19

Ten objects reported inside ten LD

There are ten asteroidal objects reported inside ten lunar distances (LD) of our planet today. Nearest is newly announced risk-listed 2019 KY3, which is inbound from 5.02 to 2.42 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
0.85 LD May 28 2019 KT 16 m  10.00 to 12.58 LD May 24 - today intruder, exits ten LD, risk
2.28 LD tomorrow 2019 KY3 17 m  2.42 from 5.02 LD May 30 - June 4 NEW, risk - MPEC
2.65 LD May 30 2019 KG2 22 m  4.54 to 6.91 LD May 27 - June 3 risk - DOU
3.77 LD June 3 2012 KZ41 32 m  6.56 from 8.90 LD May 31 - June 7
3.94 LD June 6 2019 KA3 9 m  5.34 from 5.96 LD May 26 - June 16 NEW, NHATS target - MPEC, DOU
4.15 LD May 22 2019 KN2 14 m  8.19 to 8.86 LD May 10 - June 3 NHATS target - DOU
5.49 LD June 4 2019 KY 18 m  6.50 from 7.34 LD May 29 - June 10 NHATS target
7.03 LD May 29 2019 KV 20 m  7.69 to 8.27 LD May 23 - June 4 NHATS target - DOU
8.39 LD June 5 2019 KA4 21 m  9.91 from 10.86 LD today - June 8 NEW, enters ten LD - MPEC
8.7   LD today* 2019 KL2 11 m  8.7 LD May 27 - June 5 Earth closest at 0024 UTC +/- 8
mins.*, NHATS target
Approaching
5.65 LD June 7 2019 KZ3 50 m  14.44 from 16.54 LD June 4 - 11 NEW - MPEC

This report was updated at 2150 UTC with with three discoveries: approaching 2019 KZ3 (MPEC) and inbound objects 2019 KA4 (MPEC) and 2019 KY3 (MPEC). Your first neighborhood asteroid traffic report was generated at 1742 UTC with the discoveries announced late yesterday of inbound 2019 KA3 (MPEC, DOU) and already departed 2019 KK3 (MPEC, DOU), which passed us at about 8.5 LD on May 26th. And with today's DOU MPEC having follow-up for outbound objects 2019 KN2, 2019 KG2, and 2019 KV, and for distant 68216 2001 CV26.



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 1 June '19

The MPC's NEO Confirmation Page has 156 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 156 objects listed. Of these, 94 were "one nighters." So far The Tracking News has counted a total of 188 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 1 June '19

Minor Planet Electronic Circulars

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


MPEC 2019-L09 - "19:14 UT" - 2019 KB4


MPEC 2019-L08 - "19:09 UT" - 2019 KA4


MPEC 2019-L07 - "19:03 UT" - 2019 KZ3


MPEC 2019-L06 - "18:58 UT" - 2019 KY3


MPEC 2019-L05 - "18:53 UT" - 2019 KX3


MPEC 2019-L04 - "18:47 UT" - 2019 KW3


MPEC 2019-L03 - "18:42 UT" - 2019 KU3


MPEC 2019-L02 - "18:34 UT" - 2019 GR21


<< DOU on 1 June '19 >>  MPEC 2019-L01 - "12:03 UT" - Daily Orbit Update

Observers  on 1 June '19

A total of 37 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2019-L04 -- 2019 KW3
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2019-L01, 2019-L03, 2019-L06, 2019-L07 & 2019-L09 -- 2019 KZ3, 2019 KY3, 2019 KU3, 2019 KO2, 2019 KB4
T05ATLAS Haleakala in Hawaii, 52 in MPECs 2019-L01 & 2019-L04 -- 2019 KW3, 2006 KE, 99248, 90367, 88263, 86039, 85989, 85774, 85236, 68950, 68216, 533671, 528650, 495615, 491567, 453778, 427643, 416186, 408869, 380160, 376775, 355256, 35107, 326777, 297300, 257744, 244670, 238063, 231134, 188174, 18736, 162181, 153814, 143947, 142040, 141593, 137170, 12538, 10145, 6178, 5879, 5693, 5587, 4957, 3199, 3122, 3103, 3102, 1980, 1943, 1620, 1036
T08ATLAS Mauna Loa in Hawaii, 40 in MPECs 2019-L01 & 2019-L04 -- 2019 KW3, 99248, 89958, 88263, 68950, 528650, 524471, 495615, 455736, 453778, 416186, 408869, 381677, 380160, 355256, 35107, 326777, 257744, 244670, 242450, 18736, 163696, 163051, 162181, 159686, 153814, 141593, 140928, 6178, 5693, 5626, 5332, 5189, 4957, 3199, 3122, 3103, 3102, 1980, 1036
I47Auger Obs. in Argentina, 1 in MPEC 2019-L04 -- 2019 KW3
C77Bernezzo Obs. in Italy, 1 in MPEC 2019-L07 -- 2019 KZ3
X74Campo dos Amarais Obs., 3 in MPEC 2019-L01 -- 495615, 10145, 3122
160Castelmartini Obs. in Italy, 3 in MPEC 2019-L01 -- 6178, 5693, 5189
703Catalina Sky Survey (CSS) in Arizona, 40 in MPECs 2019-L01, 2019-L06 & 2019-L07 -- 2019 KZ3, 2019 KY3, 2018 XG5, 2009 DL1, 96631, 90367, 87025, 85236, 68950, 68216, 522684, 491567, 441825, 408869, 387733, 355256, 35107, 326777, 297300, 26166, 257744, 244670, 231134, 188174, 168378, 163696, 163051, 162181, 153814, 143947, 142040, 141593, 140928, 137170, 112221, 6178, 5693, 5332, 1036, 433
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2019-L01 -- 2019 KO2
K87Dettelbach Vineyard Obs. in Germany, 2 in MPECs 2019-L01 & 2019-L07 -- 2019 KZ3, 2019 KA3
L05Dridri Obs. in Italy, 1 in MPEC 2019-L01 -- 1036
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2019-L07 -- 2019 KZ3
203GiaGa Obs. in Italy, 1 in MPEC 2019-L07 -- 2019 KZ3
J95Great Shefford Obs. in England, 2 in MPECs 2019-L06 & 2019-L07 -- 2019 KZ3, 2019 KY3
A17Guidestar Obs. in Germany, 2 in MPECs 2019-L01 & 2019-L07 -- 2019 KZ3, 2019 BJ5
K38M57 Obs. in Italy, 2 in MPECs 2019-L01 & 2019-L07 -- 2019 KZ3, 2019 GD3
G96Mt. Lemmon Survey (MLS) in Arizona, 36 in MPECs 2019-L01, 2019-L02 & 2019-L09 -- 2019 KB4, 2019 JY4, 2019 JW2, 2019 JS2, 2019 JA8, 2019 HC, 2019 GR21, 2019 EQ1, 2018 YA3, 2018 XQ4, 2017 YT5, 2010 GR75, 2006 KZ86, 2005 GK, 90373, 90367, 89959, 530531, 513170, 489900, 468910, 468741, 468468, 441825, 410778, 345813, 326683, 23187, 185716, 173561, 143637, 142040, 139047, 112221, 10150, 3551
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2019-L01 -- 159677
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2019-L01 -- 155140
F51Pan-STARRS 1 (PS1) in Hawaii, 26 in MPECs 2019-L01, 2019-L04, 2019-L05, 2019-L07, 2019-L08 & 2019-L09 -- 2019 KZ3, 2019 KX3, 2019 KW3, 2019 KB4, 2019 KA4, 2019 JP5, 2019 CN4, 2017 WN28, 2012 KA4, 2010 UX95, 2008 HF2, 89959, 85938, 68348, 529670, 365246, 337866, 329571, 318450, 278327, 226219, 206359, 175921, 136900, 4179, 1980
F52Pan-STARRS 2 (PS2) in Hawaii, 28 in MPECs 2019-L01, 2019-L03 & 2019-L08 -- 2019 KU3, 2019 KO2, 2019 KA4, 2018 XQ4, 2018 LM4, 96631, 90367, 85774, 524498, 483563, 480817, 468741, 468738, 376775, 366733, 326683, 277142, 23183, 199801, 18736, 185716, 143947, 143637, 141593, 141527, 5693, 3551, 3103
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2019-L01 -- 2019 KK3
H36Sandlot Obs. in Kansas, 1 in MPEC 2019-L07 -- 2019 KZ3
C95SATINO-1 in France, 3 in MPECs 2019-L01, 2019-L06 & 2019-L07 -- 2019 KZ3, 2019 KY3, 2019 CN4
204Schiaparelli Obs. in Italy, 3 in MPECs 2019-L06, 2019-L07 & 2019-L08 -- 2019 KZ3, 2019 KY3, 2019 KA4
033Schwarzschild Obs. in Germany, 2 in MPECs 2019-L03 & 2019-L07 -- 2019 KZ3, 2019 KU3
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-L01 -- 2019 GD3
G40)program code ")" (18) via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPEC 2019-L01 -- 244670, 5693
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2019-L01 -- 2019 KN2, 2019 KK2, 1036
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2019-L01 -- 2019 KO2, 2019 KM2
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2019-L07 -- 2019 KZ3
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2019-L06, 2019-L07 & 2019-L08 -- 2019 KZ3, 2019 KY3, 2019 KA4
I52Steward Obs. Mt. Lemmon Station in Arizona, 23 in MPECs 2019-L01, 2019-L02, 2019-L03, 2019-L04, 2019-L07, 2019-L08 & 2019-L09 -- 2019 KZ3, 2019 KW3, 2019 KV, 2019 KU3, 2019 KS, 2019 KR, 2019 KN2, 2019 KK2, 2019 KJ1, 2019 KG1, 2019 KG, 2019 KF1, 2019 KE2, 2019 KD2, 2019 KD, 2019 KB4, 2019 KA4, 2019 JX2, 2019 JQ7, 2019 JN1, 2019 JK1, 2019 GR21, 2016 VS5
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2019-L01 -- 2019 KN2, 2019 JR7, 2019 JM1
L01Visnjan Obs., 3 in MPECs 2019-L06, 2019-L07 & 2019-L08 -- 2019 KZ3, 2019 KY3, 2019 KA4
C51WISE in Earth polar orbit, 3 in MPEC 2019-L01 -- 2019 KB2, 87025, 495615
I41Zwicky Transient Facility (ZTF) in southern California, 10 in MPECs 2019-L01 & 2019-L06 -- 2019 KY3, 2019 KG2, 2019 CW5, 2006 KE, 85709, 52381, 231134, 6178, 4401, 3102
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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 KB4NEODyS21012029-207247.42e-10-6.33-6.650NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2019-05-29.573 to 2019-06-01.400."
2019 KY3JPL Sentry21012086-211036.8105e-07-7.01-7.230JPL: Computed at 12:58 today Pacific time based on 35 observations spanning 1.0195 days (2019-May-31.270846 to 2019-Jun-01.29035). Diameter approximately 0.017 km. from weighted mean H=26.55.
NEODyS21012086-2117104.71e-06-6.17-6.320NEODyS: "Based on 37 optical observations (of which 2 are rejected as outliers) from 2019-05-31.272 to 2019-06-01.308."
2019 KN2JPL Sentry1600R E M O V E DJPL: Risk listing removed at 1406 UTC today
NEODyS1600R E M O V E D-
2019 KG2NEODyS1600210811.4e-08-8.54-8.540NEODyS: "Based on 105 optical observations (of which 5 are rejected as outliers) from 2019-05-27.365 to 2019-05-30.247."
2019 JR7JPL Sentry16002067-206711.617e-07-5.16-5.160JPL: Computed at 06:58 today Pacific time based on 36 observations spanning 23.651 days (2019-May-07.92534 to 2019-May-31.576). Diameter approximately 0.130 km. from weighted mean H=22.05.
NEODyS1600206718.02e-08-5.51-5.510NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2019-05-07.926 to 2019-05-31.577."
2019 JM1JPL Sentry1600R E M O V E DJPL: Risk listing removed at 1359 UTC today
NEODyS1600R E M O V E D-
2019 GR21JPL Sentry2101R E M O V E DJPL: Risk listing removed at 1957 UTC today

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 1 June '19

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

2150Updated Traffic Report
2101Noted that JPL Sentry has removed 2019 GR21 as an impact risk - see above
Noted that NEODyS has posted 2019 KB4 as an impact risk - see above
Noted that JPL Sentry has posted 2019 KY3 as an impact risk - see above
Noted that NEODyS has posted 2019 KY3 as an impact risk - see above
1942Grabbed MPEC 2019-L07 - 2019 KZ3 - see above
Grabbed MPEC 2019-L08 - 2019 KA4 - see above
Grabbed MPEC 2019-L09 - 2019 KB4 - see above
1902Grabbed MPEC 2019-L02 - 2019 GR21 - see above
Grabbed MPEC 2019-L03 - 2019 KU3 - see above
Grabbed MPEC 2019-L04 - 2019 KW3 - see above
Grabbed MPEC 2019-L05 - 2019 KX3 - see above
Grabbed MPEC 2019-L06 - 2019 KY3 - see above
1600Noted that JPL Sentry has removed 2019 JM1 as an impact risk - see above
Noted that NEODyS has removed 2019 JM1 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 JR7 risk assessment - see above
Noted that NEODyS has updated its 2019 JR7 risk assessment - see above
Noted that NEODyS has updated its 2019 KG2 risk assessment - see above
Noted that JPL Sentry has removed 2019 KN2 as an impact risk - see above
Noted that NEODyS has removed 2019 KN2 as an impact risk - see above
Grabbed MPEC 2019-L01 - Daily Orbit Update - see above