Contents  on 22 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 22 May '18

Five objects reported inside ten LD

Five transient natural objects are reported flying within ten lunar distances (LD) of Earth today. Nearest is newly announced intruder 2018 KW1, which, already just inside our planet's sphere of gravitational influence (SOI), enters the Earth-Moon system, coming in from distance of 2.40 to 0.88 LD from Earth. Also in the SOI, 2018 KS gets its closest to us this time around -- 2.05 LD at 0401 UTC.

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 tomorrow 2018 KW1 4 m  0.88 from 2.40 LD May 17 - 29 NEW, intruder today, inside Earth SOI - MPEC
2.05 LD today 2018 KS 9 m  2.05 LD May 16 - 27 NHATS target, Earth closest at 0401 UTC,
Moon closest 1.59 LD at 0635 UTC
2.24 LD yesterday 2018 KF1 25 m  2.55 to 3.86 LD May 16 - 26 risk - DOU
5.29 LD May 20 2018 JG1 43 m  6.43 to 7.63 LD May 15 - 24 risk
8.70 LD May 19 2018 KQ 11 m  9.39 to 10.17 LD May 17 - 22 exits ten LD

This report was generated at 2018 UTC with the discovery of inbound intruder 2018 KW1 (MPEC), and with follow-up in today's DOU MPEC for three objects in the accompanying traffic tables plus four more that have departed: 2018 KO1, 2018 KU, 2014 JR25, and risk-listed 2018 GE2, as well as distant 2002 JR100. We also note radar astrometry from May, March, and January posted late yesterday for 2018 BH3, 2017 VR12, 388945 2008 TZ3, and 1999 FN19.

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  20.68 from 23.41 LD May 28 - 30 radar target
5.56 LD June 10 2018 EJ4 186 m  26.50 from 27.82 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  20.60 from 21.43 LD June 6 - 15 NHATS target - DOU


<< Reading:  News items from the Sao Paulo Research Foundation (FAPESP), the Royal Astronomical Society (RAS), and the French National Center for Scientific Research (CNRS) accompany the publication of a science paper that concludes asteroidal object 514107 2015 BZ509 is the "first interstellar immigrant discovered in the Solar System." This is based on computer simulations indicating that the object could have been in a stable retrograde co-orbit with Jupiter since the end of planet formation some 4.5 billion years ago, and the simplest explanation for this is having been captured from a different star's planetary system. Two other science papers about this object can be found here and here. Update:  Columnist Phil Plait is skeptical, as are others.



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 these traffic reports (2007) but is not presently 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 22 May '18

The MPC's NEO Confirmation Page has 27 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 27 objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 35 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 22 May '18

Minor Planet Electronic Circulars

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


MPEC 2018-K67 - "23:25 UT" - 2018 KX1


MPEC 2018-K66 - "17:11 UT" - 2018 KW1


MPEC 2018-K65 - "15:15 UT" - 2018 KV1


MPEC 2018-K64 - "15:12 UT" - 2018 KU1


<< DOU on 22 May '18 >>  MPEC 2018-K63 - "12:05 UT" - Daily Orbit Update

Observers  on 22 May '18

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-K63 -- 2018 KO1
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2018-K65 -- 2018 KV1
T05ATLAS Haleakala in Hawaii, 7 in MPEC 2018-K63 -- 2018 KM1, 2018 BY2, 450648, 24761, 220839, 15745, 1627
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2018-K63 -- 1999 LK1, 68348, 444193, 436775, 18882, 5646, 5604, 1685
703Catalina Sky Survey (CSS) in Arizona, 19 in MPEC 2018-K63 -- 2015 DP155, 2008 HO3, 1999 LK1, 85628, 68348, 66391, 516976, 513497, 495615, 374851, 36183, 25916, 186822, 172034, 139359, 6569, 5626, 5604, 1685
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPECs 2018-K63 & 2018-K65 -- 2018 KV1, 2018 KP
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-K67 -- 2018 KX1
K87Dettelbach Vineyard Obs. in Germany, 4 in MPEC 2018-K63 -- 2018 KF1, 2018 JK3, 2018 GA5, 2018 EJ4
K88GINOP-KHK in Hungary, 1 in MPEC 2018-K63 -- 2018 JB3
J95Great Shefford Obs. in England, 2 in MPECs 2018-K63 & 2018-K67 -- 2018 KX1, 2018 KF1
Z43Landehen Obs., 2 in MPEC 2018-K63 -- 25916, 138847
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2018-K64, 2018-K65 & 2018-K67 -- 2018 KX1, 2018 KV1, 2018 KU1
932McCarthy Obs. in Connecticut, 1 in MPEC 2018-K63 -- 2018 KF1
G96Mt. Lemmon Survey (MLS) in Arizona, 16 in MPECs 2018-K63, 2018-K64, 2018-K65, 2018-K66 & 2018-K67 -- 2018 KX1, 2018 KW1, 2018 KV1, 2018 KU1, 2018 KH, 2018 EQ4, 2018 DB2, 2018 BY2, 2015 KJ19, 2014 TF64, 2012 FN62, 2002 ON4, 2002 JR100, 508767, 361754, 348400
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-K63 -- 2018 KK
Z80Northolt Branch Obs. in England, 2 in MPEC 2018-K63 -- 2018 KF1, 2018 JK3
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPEC 2018-K63 -- 2018 JQ1, 2018 JJ3, 2018 JE5, 2018 JC3, 2014 JR25, 2008 HO3, 2005 QA5, 65996, 508796, 436763, 395143, 242708, 100004
D29Purple Mtn. Obs. Xuyi Station in China, 7 in MPEC 2018-K63 -- 2013 QH10, 86666, 85490, 242643, 162854, 136839, 5626
W71Rand II Obs. in New York, 2 in MPEC 2018-K63 -- 142040, 138847
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-K64 -- 2018 KU1
033Schwarzschild Obs. in Germany, 2 in MPECs 2018-K64 & 2018-K67 -- 2018 KX1, 2018 KU1
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-K63 -- 2018 JS1
Y00SONEAR in Brazil, 1 in MPEC 2018-K63 -- 220839
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2018-K63 -- 2018 JD5, 2015 HF11, 88254
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2018-K63 -- 2018 KB1, 2018 EQ4, 2015 QM3
I52Steward Obs. Mt. Lemmon Station in Arizona, 42 in MPECs 2018-K63, 2018-K64, 2018-K65, 2018-K66 & 2018-K67 -- 2018 KX1, 2018 KW1, 2018 KV1, 2018 KV, 2018 KU1, 2018 KU, 2018 KR, 2018 KP, 2018 KO, 2018 KL, 2018 KK, 2018 KH, 2018 KE1, 2018 KD1, 2018 JY1, 2018 JV2, 2018 JS1, 2018 JQ1, 2018 JN1, 2018 JK3, 2018 JJ3, 2018 JG2, 2018 JF2, 2018 JF, 2018 JE5, 2018 JE1, 2018 JE, 2018 JD5, 2018 JD2, 2018 JC3, 2018 JA3, 2018 JA, 2018 GX4, 2018 GT1, 2018 GQ5, 2018 GQ2, 2018 GA5, 2018 EQ4, 2018 DB2, 2018 CE2, 2018 AZ, 2017 GT5
Z52The Studios Obs., 1 in MPEC 2018-K63 -- 138847
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-K63 -- 2018 GL2, 2018 GE2
L01Visnjan Obs., 2 in MPECs 2018-K64 & 2018-K65 -- 2018 KV1, 2018 KU1
C51WISE in Earth polar orbit, 3 in MPEC 2018-K63 -- 2004 CL1, 424482, 115052
C42Xingming Obs. in China, 1 in MPEC 2018-K66 -- 2018 KW1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 KF1NEODyS1601R E M O V E D-
JPL Sentry15322101-210111.244e-06-6.55-6.550JPL: Computed at 07:46 today Pacific time based on 122 observations spanning 1.8539 days (2018-May-19.30836 to 2018-May-21.16228). Diameter approximately 0.025 km. from weighted mean H=25.67.
2018 KB1NEODyS1532R E M O V E D-
2018 JD5JPL Sentry1532R E M O V E DJPL: Risk listing removed at 1434 UTC today
2018 GL2JPL Sentry1532R E M O V E DJPL: Risk listing removed at 1420 UTC today
2018 GE2JPL Sentry16392060-2117437.511643e-05-5.42-5.990JPL #2 for the day: Computed at 09:14 today Pacific time based on 104 observations spanning 36.027 days (2018-Apr-10.40973 to 2018-May-16.436634). Diameter approximately 0.013 km. from weighted mean H=27.02.

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 22 May '18

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

2358Grabbed MPEC 2018-K67 - 2018 KX1 - see above
2018Generated Traffic Report
1737Grabbed MPEC 2018-K66 - 2018 KW1 - see above
1639Noted that JPL Sentry has updated its 2018 GE2 risk assessment - see above
1601Noted that NEODyS has removed 2018 KF1 as an impact risk - see above
1532Noted that JPL Sentry has updated its 2018 GE2 risk assessment - see above
Noted that JPL Sentry has removed 2018 GL2 as an impact risk - see above
Noted that JPL Sentry has removed 2018 JD5 as an impact risk - see above
Noted that NEODyS has removed 2018 KB1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 KF1 risk assessment - see above
Grabbed MPEC 2018-K63 - Daily Orbit Update - see above
Grabbed MPEC 2018-K64 - 2018 KU1 - see above
Grabbed MPEC 2018-K65 - 2018 KV1 - see above