Contents  on 23 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 23 May '18

Four objects reported inside ten LD

Four visitors are reported passing less than ten lunar distances (LD) from our home world today. Nearest is intruder 2018 KW1, which spends the whole day inside the Earth-Moon system. It moves in from 0.88 LD, passes the Moon at 0.57 LD at 0237 UTC, then reaches 0.39 LD from Earth at 1156 UTC, and moves away to 0.89 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 today 2018 KW1 4 m  0.39 LD May 17 - 29 intruder today, NHATS target,
Moon closest 0.57 LD at 0237 UTC,
Earth closest at 1156 UTC - MPEC, DOU
2.05 LD yesterday 2018 KS 9 m  2.50 to 3.75 LD May 16 - 27 NHATS target
2.24 LD May 21 2018 KF1 25 m  3.86 to 5.53 LD May 16 - 26 risk - DOU
5.29 LD May 20 2018 JG1 43 m  7.63 to 9.06 LD May 15 - 24 risk
Approaching (sorted by 10-LD bubble entry date)
9.50 LD May 29 68347 2001 KB67 371 m  18.06 from 20.68 LD May 28 - 30 radar target
5.56 LD June 10 2018 EJ4 186 m  25.18 from 26.50 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  19.77 from 20.60 LD June 6 - 15 NHATS target - DOU

This report was generated at 2012 UTC with the discovery of just departed 2018 KD2 (MPEC), which flew by us at 2.24 LD on May 19th. 2018 KW1 had it's own follow-up MPEC and data in today's DOU MPEC, which also carries follow-up for three other objects in the active traffic table here plus four departed objects: 2018 KU, 2018 JY, 1999 FN19, and risk-listed 2018 JN.



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 23 May '18

The MPC's NEO Confirmation Page has 26 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 26 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 36 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 23 May '18

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 2018-K76 - "17:06 UT" - 2014 MP60


MPEC 2018-K75 - "17:04 UT" - 2010 GZ33


MPEC 2018-K74 - "16:28 UT" - 2018 KE2


MPEC 2018-K73 - "16:24 UT" - 2018 KD2


MPEC 2018-K72 - "16:16 UT" - 2018 KC2


<< DOU on 23 May '18 >>  MPEC 2018-K71 - "12:06 UT" - Daily Orbit Update


MPEC 2018-K70 - "02:05 UT" - 2017 EH1


MPEC 2018-K69 - "02:04 UT" - 2013 NP8


MPEC 2018-K68 - "00:44 UT" - 2018 KW1

Observers  on 23 May '18

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

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-K73 -- 2018 KD2
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2018-K71 -- 2018 KM1, 2018 KL1, 2018 JK1, 2018 FL3, 488461, 363626
T05ATLAS Haleakala in Hawaii, 5 in MPEC 2018-K71 -- 2015 DP155, 152931, 138847, 9856, 1866
T08ATLAS Mauna Loa in Hawaii, 17 in MPECs 2018-K71 & 2018-K73 -- 2018 KD2, 1999 LK1, 85628, 508796, 495615, 475967, 467309, 374851, 36183, 25916, 242643, 164121, 163243, 13553, 5626, 1036, 719
X74Campo dos Amarais Obs., 1 in MPEC 2018-K71 -- 2018 FQ5
703Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2018-K71 -- 2018 JA, 2018 EJ4, 85989, 399611, 397237, 365246, 6455, 3752, 1866
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 12 in MPECs 2018-K71, 2018-K72 & 2018-K74 -- 2018 KP, 2018 KN1, 2018 KJ1, 2018 KE2, 2018 KC2, 2018 JO1, 2018 JN1, 2018 GG2, 2018 FS1, 2017 SB14, 2017 MT8, 2015 RR150
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2018-K69, 2018-K72, 2018-K73, 2018-K74, 2018-K75 & 2018-K76 -- 2018 KE2, 2018 KD2, 2018 KC2, 2014 MP60, 2013 NP8, 2010 GZ33
J95Great Shefford Obs. in England, 2 in MPECs 2018-K68 & 2018-K71 -- 2018 KW1, 2018 KF1
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2018-K71 & 2018-K72 -- 2018 KW1, 2018 KC2
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2018-K74 -- 2018 KE2
G96Mt. Lemmon Survey (MLS) in Arizona, 13 in MPEC 2018-K71 -- 2018 JY1, 2018 JP1, 2018 JO1, 2018 JJ2, 2018 JF, 2018 JD2, 2011 KN9, 2008 JP14, 1999 FN19, 68346, 220839, 154268, 1627
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-K71 -- 2018 KF1, 2015 DP155, 139345
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2018-K71, 2018-K72 & 2018-K74 -- 2018 KE2, 2018 KC2, 2018 EJ4
C95SATINO-1 in France, 1 in MPEC 2018-K71 -- 15745
033Schwarzschild Obs. in Germany, 1 in MPEC 2018-K72 -- 2018 KC2
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-K71 -- 2018 EJ4
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2018-K71, 2018-K73 & 2018-K74 -- 2018 KE2, 2018 KD2, 2018 JO1, 2018 JD5, 2015 MB54
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2018-K71 & 2018-K72 -- 2018 KC2, 2018 KB1, 2018 JY, 2018 JN, 2018 JC2, 2017 KU34, 2015 UC67, 2009 OO9
I52Steward Obs. Mt. Lemmon Station in Arizona, 43 in MPECs 2018-K71, 2018-K72 & 2018-K73 -- 2018 KW1, 2018 KV, 2018 KU, 2018 KR, 2018 KQ1, 2018 KM1, 2018 KL1, 2018 KK1, 2018 KK, 2018 KH, 2018 KF1, 2018 KD2, 2018 KC2, 2018 KB1, 2018 JY1, 2018 JV2, 2018 JS1, 2018 JP1, 2018 JK3, 2018 JJ3, 2018 JJ2, 2018 JF2, 2018 JF, 2018 JE5, 2018 JE1, 2018 JD5, 2018 JD2, 2018 JC3, 2018 JA3, 2018 JA, 2018 HS3, 2018 GT1, 2018 FS3, 2018 EQ4, 2018 DB2, 2018 BY2, 2017 WH14, 2017 VL15, 2017 KU34, 2017 GT5, 2016 JP, 2016 CX264, 173664
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPECs 2018-K70 & 2018-K71 -- 2018 JN, 2018 JC2, 2018 HJ2, 2017 EH1
E08Wobblesock Obs. in New South Wales, 2 in MPECs 2018-K71 & 2018-K73 -- 2018 KD2, 2018 FQ5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 KF1JPL Sentry15082101-210111.196e-06-6.57-6.570JPL: Computed at 07:36 today Pacific time based on 151 observations spanning 4.1205 days (2018-May-19.30836 to 2018-May-23.42886). Diameter approximately 0.025 km. from weighted mean H=25.69.
2018 JD5NEODyS1508R E M O V E D-
2018 JC2NEODyS1508R E M O V E D-
JPL Sentry15082050-205015.405e-10-8.08-8.080JPL: Computed at 07:18 today Pacific time based on 74 observations spanning 13.906 days (2018-May-09.32052 to 2018-May-23.2262). Diameter approximately 0.094 km. from weighted mean H=22.79.
2018 JNJPL Sentry15082100-211222.035e-06-6.08-6.350JPL: Computed at 07:14 today Pacific time based on 131 observations spanning 17.933 days (2018-May-05.42349 to 2018-May-23.35674). Diameter approximately 0.033 km. from weighted mean H=25.05.
2018 HJ2JPL Sentry15082085-208511.689e-07-6.77-6.770JPL: Computed at 07:09 today Pacific time based on 101 observations spanning 29.043 days (2018-Apr-23.41101 to 2018-May-22.454455). Diameter approximately 0.042 km. from weighted mean H=24.51.
2018 GL2NEODyS15082060-211277.63e-08-6.73-6.990NEODyS: "Based on 71 optical observations (of which 0 are rejected as outliers) from 2018-04-11.236 to 2018-05-16.326."
2018 GE2NEODyS15082054-21172297.59e-05-5.39-5.990NEODyS: "Based on 105 optical observations (of which 4 are rejected as outliers) from 2018-04-10.411 to 2018-05-16.437."

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 23 May '18

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

2012Generated Traffic Report
1900Grabbed MPEC 2018-K72 - 2018 KC2 - see above
Grabbed MPEC 2018-K73 - 2018 KD2 - see above
Grabbed MPEC 2018-K74 - 2018 KE2 - see above
Grabbed MPEC 2018-K75 - 2010 GZ33 - see above
Grabbed MPEC 2018-K76 - 2014 MP60 - see above
1508Noted that NEODyS has updated its 2018 GE2 risk assessment - see above
Noted that NEODyS has updated its 2018 GL2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 HJ2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 JC2 risk assessment - see above
Noted that NEODyS has removed 2018 JC2 as an impact risk - see above
Noted that NEODyS has removed 2018 JD5 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 JN risk assessment - see above
Noted that JPL Sentry has updated its 2018 KF1 risk assessment - see above
Grabbed MPEC 2018-K71 - Daily Orbit Update - see above
0336Grabbed MPEC 2018-K68 - 2018 KW1 - see above
Grabbed MPEC 2018-K69 - 2013 NP8 - see above
Grabbed MPEC 2018-K70 - 2017 EH1 - see above