Contents  on 24 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 24 May '18

Four objects reported inside ten LD

There are four asteroidal objects reported inside ten lunar distances (LD) of Earth today. Nearest is intruder 2018 KW1, which started the day inside the Earth-Moon system at 0.89 LD from Earth and finishes out at 2.41 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 yesterday 2018 KW1 4 m  0.89 to 2.41 LD May 17 - 29 intruder today, NHATS target, exits Earth SOI
2.05 LD May 22 2018 KS 9 m  3.75 to 5.27 LD May 16 - 27 NHATS target
2.24 LD May 21 2018 KF1 25 m  5.53 to 7.33 LD May 16 - 26 risk
5.29 LD May 20 2018 JG1 43 m  9.06 to 10.62 LD May 15 - 24 exits ten LD, risk
Approaching (sorted by 10-LD bubble entry date)
6.10 LD May 29 2018 KN2 27 m  10.37 from 11.89 LD tomorrow - June 3 NEW - MPEC
9.50 LD May 29 68347 2001 KB67 371 m  15.58 from 18.06 LD May 28 - 30 radar target
5.56 LD June 10 2018 EJ4 186 m  23.86 from 25.18 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  18.95 from 19.77 LD June 6 - 15 NHATS target - DOU

This report was updated at 2350 UTC with the discovery of approaching 2018 KN2 (MPEC). Your first local flying rocks traffic report was generated at 1811 UTC with follow-up in today's DOU MPEC for two approaching objects in the active traffic table here and for six more that have departed: 2018 KO1, 2018 KU, 2018 JM, 1999 FN19, intruder 2010 WC9, and risk-listed 2018 JN, plus distant 450894 2008 BT18.


<< Reading:  The Southwest Research Institute has a news item telling about their new "'giant comet' cosmochemical model of Pluto formation" based on data from missions to 134340 Pluto and 67P/Churyumov-Gerasimenko. The paper can be found here. Speaking of 67P/Chury, the Max Planck Institute for Solar System Research has a piece describing how "the surface along the terminator almost instantaneously becomes active [when] the Sun rises over a part of the comet." NASA's Kepler mission is wrapping up with another round of planet hunting while also observing some small Solar-System bodies. Lawrence Livermore National Lab explains how studying the oldest known meteorite from Mars provides information on that planet's early giant impact history and why its southern and northern hemispheres are so different. And we also note this science preprint from Canada, which states that "Recent studies have shown that the proposal peer review processes employed by a variety of organizations to allocate astronomical telescope time produce outcomes that are systematically biased depending on whether [the] proposal's principal investigator (PI) is a man or a woman."



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 approached Earth within ten LD since A/CC began these traffic reports eleven years ago but is not currently coming 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 24 May '18

The MPC's NEO Confirmation Page has 22 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 22 objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 33 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 24 May '18

Minor Planet Electronic Circulars

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


MPEC 2018-K83 - "21:58 UT" - 2018 KP2


MPEC 2018-K82 - "21:49 UT" - 2018 KO2


MPEC 2018-K81 - "21:45 UT" - 2018 KN2


MPEC 2018-K80 - "21:42 UT" - 2018 KM2


MPEC 2018-K79 - "21:39 UT" - 2018 KL2


MPEC 2018-K78 - "21:35 UT" - 2018 KK2


<< DOU on 24 May '18 >>  MPEC 2018-K77 - "12:06 UT" - Daily Orbit Update

Observers  on 24 May '18

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPECs 2018-K77, 2018-K80, 2018-K81 & 2018-K83 -- 2018 KP2, 2018 KN2, 2018 KM2, 2018 JK1, 2018 JC2, 2017 SB14, 2010 CF19, 2135
T05ATLAS Haleakala in Hawaii, 9 in MPEC 2018-K77 -- 2012 UV27, 2009 SK104, 68348, 65706, 444193, 436775, 6456, 5604, 1685
T08ATLAS Mauna Loa in Hawaii, 9 in MPEC 2018-K77 -- 2018 KM1, 2018 JK3, 2018 JE1, 450648, 220839, 15745, 152931, 139289, 1627
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-K83 -- 2018 KP2
703Catalina Sky Survey (CSS) in Arizona, 20 in MPECs 2018-K77 & 2018-K83 -- 2018 KP2, 2018 KM1, 2018 JY1, 2018 JK3, 2018 JE1, 2016 JP, 2002 ON4, 514652, 450894, 450648, 439313, 37655, 24761, 243566, 16834, 154268, 152931, 138847, 1865, 1627
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 12 in MPECs 2018-K77, 2018-K78 & 2018-K80 -- 2018 KM2, 2018 KK2, 2018 JP1, 2018 JO1, 2018 FO5, 2018 AO18, 2017 QE18, 2017 MT8, 2016 OY2, 2016 LJ49, 2016 JN, 2016 GH135
309'Martin Altmann in Germany via Cerro Paranal in Chile, 1 in MPEC 2018-K77 -- 2018 HR3
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2018-K77, 2018-K79, 2018-K80 & 2018-K82 -- 2018 KO2, 2018 KM2, 2018 KL2, 2018 JY2, 2018 HH2, 2018 GJ4
734Farpoint Obs. in Kansas, 4 in MPECs 2018-K79, 2018-K80, 2018-K81 & 2018-K83 -- 2018 KP2, 2018 KN2, 2018 KM2, 2018 KL2
J95Great Shefford Obs. in England, 1 in MPEC 2018-K81 -- 2018 KN2
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-K83 -- 2018 KP2
T03LCO Haleakala Clamshell#3 in Hawaii, 1 in MPEC 2018-K77 -- 2015 DP155
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2018-K81, 2018-K82 & 2018-K83 -- 2018 KP2, 2018 KO2, 2018 KN2
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2018-K80 -- 2018 KM2
G96Mt. Lemmon Survey (MLS) in Arizona, 21 in MPECs 2018-K77, 2018-K81, 2018-K82 & 2018-K83 -- 2018 KV, 2018 KP2, 2018 KO2, 2018 KN2, 2018 KM1, 2018 JS1, 2018 JK3, 2017 DO36, 2016 JP, 1999 FN19, 86666, 504711, 468730, 450648, 439313, 337084, 24761, 162854, 155341, 154278, 139289
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2018-K77, 2018-K79 & 2018-K80 -- 2018 KM2, 2018 KL2, 2013 LK25, 2008 KZ5, 154268
033Schwarzschild Obs. in Germany, 1 in MPEC 2018-K79 -- 2018 KL2
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPECs 2018-K77 & 2018-K81 -- 2018 KN2, 2010 WC9
691Spacewatch 0.9m telescope in Arizona, 9 in MPECs 2018-K77, 2018-K78 & 2018-K79 -- 2018 KL2, 2018 KK2, 2018 JL, 2018 GL1, 2017 KU34, 2012 LF11, 2010 MS1, 2009 OO9, 139289
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2018-K77 -- 2018 JN, 2018 JC2, 2015 UC67
I52Steward Obs. Mt. Lemmon Station in Arizona, 50 in MPECs 2018-K77, 2018-K79, 2018-K81, 2018-K82 & 2018-K83 -- 2018 KV, 2018 KU1, 2018 KU, 2018 KR, 2018 KP2, 2018 KO2, 2018 KO1, 2018 KO, 2018 KN2, 2018 KM1, 2018 KL2, 2018 KL1, 2018 KL, 2018 KK1, 2018 KK, 2018 KH1, 2018 KH, 2018 KG1, 2018 KE1, 2018 KD1, 2018 KC1, 2018 KB1, 2018 JY1, 2018 JV2, 2018 JS1, 2018 JQ1, 2018 JM, 2018 JL, 2018 JK3, 2018 JJ3, 2018 JJ2, 2018 JG2, 2018 JF2, 2018 JF, 2018 JE5, 2018 JE1, 2018 JD5, 2018 JA, 2018 HS3, 2018 GL1, 2018 EQ4, 2018 EJ4, 2018 DB2, 2018 BY2, 2018 AZ, 2017 WH14, 2017 KU34, 2017 GT5, 2016 JP, 2016 CX264
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 6 in MPECs 2018-K77 & 2018-K78 -- 2018 KT, 2018 KK2, 2018 JN, 2018 HJ2, 2018 GL1, 154590
C51WISE in Earth polar orbit, 1 in MPEC 2018-K78 -- 2018 KK2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 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 JC2JPL Sentry15342050-205011.751e-10-8.57-8.570JPL: Computed at 07:26 today Pacific time based on 80 observations spanning 14.911 days (2018-May-09.32052 to 2018-May-24.23141). Diameter approximately 0.094 km. from weighted mean H=22.79.
2018 JNJPL Sentry15342100-211222.236e-06-6.05-6.320JPL: Computed at 07:24 today Pacific time based on 135 observations spanning 18.921 days (2018-May-05.42349 to 2018-May-24.34485). Diameter approximately 0.033 km. from weighted mean H=25.06.
NEODyS15342088-211241.3e-06-6.27-6.290NEODyS: "Based on 131 optical observations (of which 1 are rejected as outliers) from 2018-05-05.424 to 2018-05-23.358."
2018 HJ2JPL Sentry15342085-208512.519e-08-7.61-7.610JPL: Computed at 07:19 today Pacific time based on 103 observations spanning 30.049 days (2018-Apr-23.41101 to 2018-May-23.46042). Diameter approximately 0.042 km. from weighted mean H=24.55.
NEODyS15342085-211423.24e-06-5.55-5.610NEODyS: "Based on 101 optical observations (of which 0 are rejected as outliers) from 2018-04-23.412 to 2018-05-22.455."

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 24 May '18

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

2350Updated Traffic Report
2233Grabbed MPEC 2018-K83 - 2018 KP2 - see above
2158Grabbed MPEC 2018-K78 - 2018 KK2 - see above
Grabbed MPEC 2018-K79 - 2018 KL2 - see above
Grabbed MPEC 2018-K80 - 2018 KM2 - see above
Grabbed MPEC 2018-K81 - 2018 KN2 - see above
Grabbed MPEC 2018-K82 - 2018 KO2 - see above
1534Noted that JPL Sentry has updated its 2018 HJ2 risk assessment - see above
Noted that NEODyS has updated its 2018 HJ2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 JC2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 JN risk assessment - see above
Noted that NEODyS has updated its 2018 JN risk assessment - see above
Grabbed MPEC 2018-K77 - Daily Orbit Update - see above