Contents  on 26 May '18

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 26 May '18

Six objects reported inside ten LD

Six minor planets are reported within ten lunar distances (LD) of Earth today. Nearest of these is intruder 2018 KW1, which moves out from 3.96 to 5.52 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
0.39 LD May 23 2018 KW1 4 m  3.96 to 5.52 LD May 17 - 29 intruder, NHATS target
2.05 LD May 22 2018 KS 9 m  6.88 to 8.53 LD May 16 - 27 NHATS target
2.24 LD May 21 2018 KF1 25 m  9.18 to 11.05 LD May 16 - 26 exits ten LD - DOU
2.48 LD May 23 2018 KT2 14 m  6.22 to 8.03 LD May 18 - 28 NHATS target - DOU
3.13 LD May 21 2018 KU2 15 m  8.23 to 9.80 LD May 15 - 27 NHATS target
6.10 LD May 29 2018 KN2 27 m  7.74 from 8.97 LD yesterday - June 3

This report was generated at 1753 UTC with follow-up in today's DOU MPEC for four objects in the active traffic tables here plus departed objects 2018 JX and 2018 HO.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.50 LD May 29 68347 2001 KB67 371 m  11.42 from 13.32 LD May 28 - 30 radar target
5.56 LD June 10 2018 EJ4 186 m  21.22 from 22.54 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  17.32 from 18.13 LD June 6 - 15 NHATS target - DOU


<< Reading:  We'd like to point you to a couple of interesting news articles. One tells about searching for meteorites in Morocco and the other about finding minor planets beyond Neptune.



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 26 May '18

The MPC's NEO Confirmation Page has 20 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 20 objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 25 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 26 May '18

Minor Planet Electronic Circulars

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


MPEC 2018-K94 - "14:32 UT" - 2018 KX2


MPEC 2018-K93 - "14:28 UT" - 2018 KW2


MPEC 2018-K92 - "14:24 UT" - 2018 KV2


<< DOU on 26 May '18 >>  MPEC 2018-K91 - "12:07 UT" - Daily Orbit Update

Observers  on 26 May '18

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 2 in MPEC 2018-K91 -- 2018 KT2, 2018 KR2
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2018-K92 -- 2018 KV2
T05ATLAS Haleakala in Hawaii, 4 in MPEC 2018-K91 -- 2018 JA, 15745, 152931, 1627
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2018-K91 -- 6456
K46Bamberg Obs. in Germany, 1 in MPEC 2018-K91 -- 1627
160Castelmartini Obs. in Italy, 1 in MPEC 2018-K93 -- 2018 KW2
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2018-K91 -- 2018 KL1, 2018 EJ4, 85989, 138847, 9856, 1866
K88GINOP-KHK in Hungary, 1 in MPEC 2018-K91 -- 2018 JB3
T04LCO Haleakala OGG B#2 in Hawaii, 1 in MPEC 2018-K91 -- 2018 EJ4
K38M57 Obs. in Italy, 1 in MPEC 2018-K91 -- 2018 EJ4
932McCarthy Obs. in Connecticut, 1 in MPEC 2018-K93 -- 2018 KW2
118Modra Obs. in Slovakia, 1 in MPEC 2018-K91 -- 2018 EJ4
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2018-K91, 2018-K93 & 2018-K94 -- 2018 KX2, 2018 KW2, 2018 JK3, 2018 JA, 2017 WH14, 162269, 4257
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-K91 -- 15745
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2018-K91 & 2018-K92 -- 2018 KV2, 2018 KR2, 2018 JA, 259802
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-K91 -- 138847
W71Rand II Obs. in New York, 5 in MPEC 2018-K91 -- 2018 KM1, 2018 KF1, 2018 JX, 2018 JA, 2015 DP155
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2018-K92, 2018-K93 & 2018-K94 -- 2018 KX2, 2018 KW2, 2018 KV2
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-K93 -- 2018 KW2
I52Steward Obs. Mt. Lemmon Station in Arizona, 3 in MPECs 2018-K92, 2018-K93 & 2018-K94 -- 2018 KX2, 2018 KW2, 2018 KV2
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2018-K91 -- 2018 JD5, 2018 JC2, 2018 HO
C51WISE in Earth polar orbit, 1 in MPEC 2018-K91 -- 504034
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 May '18

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 is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few 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
2018 JC2NEODyS2358R E M O V E D-
JPL Sentry1600R E M O V E DJPL: Risk listing removed at 1359 UTC today
2018 JNNEODyS2358210026.52e-06-5.58-5.580NEODyS: "Based on 143 optical observations (of which 1 are rejected as outliers) from 2018-05-05.424 to 2018-05-25.436."

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 26 May '18

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

2358Noted that NEODyS has removed 2018 JC2 as an impact risk - see above
Noted that NEODyS has updated its 2018 JN risk assessment - see above
1753Generated Traffic Report
1600Noted that JPL Sentry has removed 2018 JC2 as an impact risk - see above
Grabbed MPEC 2018-K91 - Daily Orbit Update - see above
Grabbed MPEC 2018-K92 - 2018 KV2 - see above
Grabbed MPEC 2018-K93 - 2018 KW2 - see above
Grabbed MPEC 2018-K94 - 2018 KX2 - see above