Contents  on 18 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 18 June '19

Four objects reported inside ten LD

Four visitors are reported inside ten lunar distances (LD) of our planet today. The nearest is within Earth's SOI. 2019 LU4 comes its closest to Earth this time around, reaching 1.97 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
1.97 LD today 2019 LU4 17 m  1.97 LD June 12 - 23 NHATS target, Earth closest at 0528 UTC
4.14 LD June 16 2019 LU 32 m  4.94 to 6.11 LD June 11 - 21
5.59 LD June 14 2019 LL1 15 m  8.91 to 10.53 LD June 10 - 18 exits ten LD
6.43 LD June 20 2019 LB2 14 m  6.48 from 6.61 LD June 9 - 30 NHATS target
Approaching - sorted by 10-LD bubble entry date
9.7   LD June 23* 2019 LM1 24 m  12.6 from 13.9 LD June 21 - 24 EPU +/- 15 mins.*
7.63 LD June 24 441987 2010 NY65 170 m  17.98 from 20.62 LD June 22 - 26 radar target
5.2   LD June 29* 2019 LV1 25 m  16.0 from 17.3 LD June 23 - July 6 EPU +/- 2.58 hours*, NHATS target
* EPU = Earth passage uncertainty

This report was generated at 1740 UTC with follow-up in today's DOU MPEC for departed objects 2019 KA4 and risk-listed 2019 LA2.



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 18 June '19

The MPC's NEO Confirmation Page has 75 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 75 objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 85 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 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-M29 - "20:56 UT" - 2019 LK5


MPEC 2019-M28 - "19:08 UT" - 2019 LJ5


MPEC 2019-M27 - "18:13 UT" - 2019 LH5


MPEC 2019-M26 - "16:17 UT" - 2019 LG5


MPEC 2019-M25 - "16:17 UT" - 2019 LF5


MPEC 2019-M24 - "16:16 UT" - 2019 LE5


MPEC 2019-M23 - "15:57 UT" - 2019 LD5


<< DOU on 18 June '19 >>  MPEC 2019-M22 - "11:54 UT" - Daily Orbit Update


MPEC 2019-M21 - "01:26 UT" - Retraction of Orbit for 2019 KV6

Observers  on 18 June '19

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2019-M22, 2019-M23, 2019-M26 & 2019-M28 -- 2019 LJ5, 2019 LG5, 2019 LD5, 2014 HS178, 2006 FJ
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2019-M24, 2019-M25 & 2019-M26 -- 2019 LG5, 2019 LF5, 2019 LE5
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2019-M22 -- 2016 JT38
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2019-M22 -- 2019 LN
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2019-M24, 2019-M27 & 2019-M29 -- 2019 LK5, 2019 LH5, 2019 LE5
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2019-M24 -- 2019 LE5
711McDonald Obs. in Texas, 1 in MPEC 2019-M24 -- 2019 LE5
G96Mt. Lemmon Survey (MLS) in Arizona, 20 in MPECs 2019-M22, 2019-M27 & 2019-M29 -- 2019 LK5, 2019 LH5, 2019 KA4, 2019 JX7, 2019 JW2, 2014 YV43, 2006 KE, 2005 GK, 87025, 533671, 491567, 483563, 481985, 450293, 366733, 162082, 159609, 12538, 5879, 887
Z80Northolt Branch Obs. in England, 1 in MPEC 2019-M22 -- 2011 HP
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2019-M23, 2019-M24, 2019-M25, 2019-M26 & 2019-M28 -- 2019 LJ5, 2019 LG5, 2019 LF5, 2019 LE5, 2019 LD5
F52Pan-STARRS 2 (PS2) in Hawaii, 3 in MPECs 2019-M23, 2019-M26 & 2019-M28 -- 2019 LJ5, 2019 LG5, 2019 LD5
C95SATINO-1 in France, 2 in MPEC 2019-M22 -- 2019 EC1, 2008 LW16
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2019-M25 -- 2019 LF5
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2019-M25 -- 2019 LF5
I52Steward Obs. Mt. Lemmon Station in Arizona, 7 in MPECs 2019-M22, 2019-M24, 2019-M25, 2019-M26, 2019-M27 & 2019-M29 -- 2019 LN, 2019 LK5, 2019 LH5, 2019 LG5, 2019 LF5, 2019 LE5, 2018 XV
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-M22 -- 2019 LA2
L01Visnjan Obs., 1 in MPEC 2019-M28 -- 2019 LJ5
C51WISE in Earth polar orbit, 5 in MPEC 2019-M22 -- 326742, 26166, 163696, 153814, 1036
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 LA2JPL Sentry17032094-211671.364889e-06-6.83-7.270JPL #2 for the day: Computed at 09:04 today Pacific time based on 35 observations spanning 8.2217 days (2019-Jun-04.23363 to 2019-Jun-12.45534). Diameter approximately 0.016 km. from weighted mean H=26.61.
NEODyS15302094-2117143.47e-06-6.43-6.810NEODyS: "Based on 31 optical observations (of which 2 are rejected as outliers) from 2019-06-04.234 to 2019-06-11.345."
2016 JT38JPL Sentry15302101-210321.8075e-07-4.51-4.610JPL: Computed at 05:58 today Pacific time based on 19 observations spanning 9.0741 days (2016-Apr-26.23238 to 2016-May-05.30645). Diameter approximately 0.312 km. from weighted mean H=20.19.
NEODyS15302078-210131.19e-07-4.60-5.030NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2016-04-26.233 to 2016-05-05.307."

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 June '19

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

2243Grabbed MPEC 2019-M27 - 2019 LH5 - see above
Grabbed MPEC 2019-M28 - 2019 LJ5 - see above
Grabbed MPEC 2019-M29 - 2019 LK5 - see above
1740Generated Traffic Report
1703Noted that JPL Sentry has updated its 2019 LA2 risk assessment - see above
Grabbed MPEC 2019-M24 - 2019 LE5 - see above
Grabbed MPEC 2019-M25 - 2019 LF5 - see above
Grabbed MPEC 2019-M26 - 2019 LG5 - see above
1601Grabbed MPEC 2019-M23 - 2019 LD5 - see above
1530Noted that JPL Sentry has updated its 2016 JT38 risk assessment - see above
Noted that NEODyS has updated its 2016 JT38 risk assessment - see above
Noted that JPL Sentry has updated its 2019 LA2 risk assessment - see above
Noted that NEODyS has updated its 2019 LA2 risk assessment - see above
Grabbed MPEC 2019-M22 - Daily Orbit Update - see above
0333Grabbed MPEC 2019-M21 - Retraction of Orbit for 2019 KV6 - see above