Contents  on 21 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 21 May '18

Four objects reported inside ten LD

There are four minor objects reported inside ten lunar distances (LD) of our home world today. Nearest are 2018 KS, which enters Earth's sphere of gravitational influence (SOI), slipping in from 2.87 to 2.07 LD, and risk-listed 2018 KF1, also in the SOI, which gets its closest to Earth on this passage, reaching 2.24 LD at 0852 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
2.05 LD tomorrow 2018 KS 9 m  2.07 from 2.87 LD May 16 - 27 NHATS target, enters Earth SOI - DOU
2.24 LD today 2018 KF1 26 m  2.24 LD May 16 - 26 Moon closest 2.85 LD at 0132 UTC,
Earth closest at 0852 UTC, risk - DOU
5.29 LD yesterday 2018 JG1 43 m  5.59 to 6.43 LD May 15 - 24 risk
8.70 LD May 19 2018 KQ 11 m  8.88 to 9.39 LD May 17 - 22

This report was generated at 1812 UTC with the discovery of already departed 2018 KO1 (MPEC), which flew past us at 3.89 LD on May 13th, and with follow-up in today's DOU MPEC for four objects seen in the active traffic tables here as well as departed objects 2018 JG3, 2018 JY, and risk-listed 2018 JN, plus distant 2002 JR100.

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  23.41 from 26.21 LD May 28 - 30 radar target
5.56 LD June 10 2018 EJ4 186 m  27.82 from 29.14 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  21.43 from 22.26 LD June 6 - 15 NHATS target - DOU



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.

Radar Astrometry  on 21 May '18

Radar observation of eight objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2030 UTC when the database was dated 21 May


Data update noted at 2103 UTC when the database was dated 21 May


Data update noted at 2201 UTC when the database was dated 21 May


Data update noted at 2230 UTC when the database was dated 21 May


Data update noted at 2300 UTC when the database was dated 21 May


Data update noted at 2330 UTC when the database was dated 21 May

NEOCP Activity  on 21 May '18

The MPC's NEO Confirmation Page has 26 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 26 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 36 listings on the NEOCP today.

New MPECs  on 21 May '18

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been fifteen MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-K62 - "19:48 UT" - 2017 QS17


MPEC 2018-K61 - "19:47 UT" - 2016 JN34


MPEC 2018-K60 - "19:45 UT" - 2015 MD131


MPEC 2018-K59 - "15:11 UT" - 2018 KK1


MPEC 2018-K58 - "15:08 UT" - 2018 KG1


MPEC 2018-K57 - "15:04 UT" - 2018 KQ1


MPEC 2018-K56 - "15:00 UT" - 2018 KP1


MPEC 2018-K55 - "14:56 UT" - 2018 KO1


MPEC 2018-K54 - "14:52 UT" - 2018 KN1


MPEC 2018-K53 - "14:48 UT" - 2018 KM1


MPEC 2018-K52 - "14:44 UT" - 2018 KL1


MPEC 2018-K51 - "14:40 UT" - 2018 KJ1


MPEC 2018-K50 - "14:30 UT" - 2018 KH1


<< DOU on 21 May '18 >>  MPEC 2018-K49 - "12:05 UT" - Daily Orbit Update


MPEC 2018-K48 - "02:54 UT" - 2015 TF202

Observers  on 21 May '18

A total of 40 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-K55 -- 2018 KO1
251Arecibo in Puerto Rico, 3 in radar -- 2018 BH3, 2017 VR12, 311554
T05ATLAS Haleakala in Hawaii, 9 in MPECs 2018-K49 & 2018-K55 -- 2018 KO1, 2005 LH8, 508796, 455550, 424482, 25916, 162168, 13553, 719
T08ATLAS Mauna Loa in Hawaii, 10 in MPECs 2018-K49, 2018-K53 & 2018-K55 -- 2018 KO1, 2018 KM1, 2018 JA, 2018 EJ4, 2015 DP155, 85989, 152931, 138847, 3752, 1866
621Bergisch Gladbach Obs. in Germany, 1 in MPEC 2018-K52 -- 2018 KL1
160Castelmartini Obs. in Italy, 1 in MPEC 2018-K53 -- 2018 KM1
703Catalina Sky Survey (CSS) in Arizona, 24 in MPECs 2018-K49 & 2018-K52 -- 2018 KL1, 2018 JL, 2015 FP118, 2008 HO3, 2005 JY80, 2002 ON4, 85628, 68346, 516976, 516803, 508767, 497117, 475967, 415029, 25916, 24445, 186822, 164121, 159533, 152637, 8037, 6569, 1865, 1627
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 21 in MPECs 2018-K48, 2018-K49, 2018-K50, 2018-K54, 2018-K55, 2018-K56, 2018-K57, 2018-K58, 2018-K60 & 2018-K62 -- 2018 KQ1, 2018 KP1, 2018 KO1, 2018 KN1, 2018 KH1, 2018 KG1, 2018 JZ2, 2018 JZ1, 2018 JV2, 2018 JQ1, 2018 JN1, 2018 JL, 2018 JJ3, 2018 JH3, 2018 JH2, 2018 JG3, 2018 JE, 2017 XJ62, 2017 QS17, 2015 TF202, 2015 MD131
K87Dettelbach Vineyard Obs. in Germany, 2 in MPECs 2018-K52 & 2018-K53 -- 2018 KM1, 2018 KL1
006Fabra Obs. in Spain, 1 in MPEC 2018-K49 -- 220839
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2018-K49, 2018-K53 & 2018-K59 -- 2018 KM1, 2018 KK1, 2018 KF1
157Frasso Sabino Obs. in Italy, 2 in MPEC 2018-K49 -- 2018 JK3, 139289
J77Golden Hill Obs. in England, 2 in MPECs 2018-K52 & 2018-K53 -- 2018 KM1, 2018 KL1
253Goldstone DSS-14 70m antenna in southern California, 5 in radar -- 2018 EB, 2013 US3, 1999 FN19, 444193, 388945
J95Great Shefford Obs. in England, 3 in MPECs 2018-K52, 2018-K53 & 2018-K59 -- 2018 KM1, 2018 KL1, 2018 KK1
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-K53 -- 2018 KM1
H01Magdalena Ridge Obs. (MRO) in New Mexico, 8 in MPECs 2018-K50, 2018-K51, 2018-K53, 2018-K54, 2018-K56, 2018-K57, 2018-K58 & 2018-K59 -- 2018 KQ1, 2018 KP1, 2018 KN1, 2018 KM1, 2018 KK1, 2018 KJ1, 2018 KH1, 2018 KG1
568^R. Wainscoat on Mauna Kea in Hawaii, 3 in MPECs 2018-K54, 2018-K56 & 2018-K57 -- 2018 KQ1, 2018 KP1, 2018 KN1
932McCarthy Obs. in Connecticut, 1 in MPEC 2018-K53 -- 2018 KM1
900Moriyama Obs. in Japan, 1 in MPEC 2018-K53 -- 2018 KM1
474Mt. John Obs. in New Zealand, 1 in MPEC 2018-K58 -- 2018 KG1
G96Mt. Lemmon Survey (MLS) in Arizona, 14 in MPECs 2018-K49, 2018-K50, 2018-K51, 2018-K53, 2018-K58 & 2018-K59 -- 2018 KM1, 2018 KK1, 2018 KJ1, 2018 KH1, 2018 KG1, 2018 GQ5, 2018 GA5, 2018 EJ4, 2014 YP15, 505657, 399611, 337228, 6455, 1866
J69North Obs. in England, 5 in MPECs 2018-K49 & 2018-K53 -- 2018 KM1, 2018 KF1, 2018 JA, 2015 KJ19, 220839
Z80Northolt Branch Obs. in England, 2 in MPECs 2018-K49 & 2018-K53 -- 2018 KM1, 2018 JA
C23Olmen Obs. in Belgium, 1 in MPEC 2018-K49 -- 1627
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-K53 -- 2018 KM1
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPECs 2018-K49, 2018-K50, 2018-K54, 2018-K56, 2018-K57 & 2018-K58 -- 2018 KQ1, 2018 KP1, 2018 KN1, 2018 KH1, 2018 KG1, 2000 WK107, 86039, 85989, 505657, 458122, 288592, 5626
K63Pascoli Obs. in Italy, 2 in MPECs 2018-K52 & 2018-K53 -- 2018 KM1, 2018 KL1
W71Rand II Obs. in New York, 1 in MPEC 2018-K53 -- 2018 KM1
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2018-K52, 2018-K53 & 2018-K59 -- 2018 KM1, 2018 KL1, 2018 KK1
C95SATINO-1 in France, 2 in MPECs 2018-K53 & 2018-K59 -- 2018 KM1, 2018 KK1
033Schwarzschild Obs. in Germany, 6 in MPECs 2018-K50, 2018-K51, 2018-K52, 2018-K53, 2018-K57 & 2018-K59 -- 2018 KQ1, 2018 KM1, 2018 KL1, 2018 KK1, 2018 KJ1, 2018 KH1
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPECs 2018-K52 & 2018-K53 -- 2018 KM1, 2018 KL1
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-K53 -- 2018 KM1
691Spacewatch 0.9m telescope in Arizona, 9 in MPECs 2018-K49, 2018-K54, 2018-K57 & 2018-K58 -- 2018 KQ1, 2018 KN1, 2018 KG1, 2018 JO1, 2018 JL, 2018 CZ13, 2016 CX264, 2009 OO9, 2002 JR100
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2018-K49, 2018-K54 & 2018-K56 -- 2018 KP1, 2018 KN1, 2018 JY, 2018 JN
I52Steward Obs. Mt. Lemmon Station in Arizona, 39 in MPECs 2018-K49, 2018-K50, 2018-K51, 2018-K52, 2018-K53, 2018-K54, 2018-K55, 2018-K56, 2018-K57, 2018-K58 & 2018-K59 -- 2018 KS, 2018 KR, 2018 KQ1, 2018 KP1, 2018 KO1, 2018 KO, 2018 KN1, 2018 KN, 2018 KM1, 2018 KM, 2018 KL1, 2018 KL, 2018 KK1, 2018 KK, 2018 KJ1, 2018 KH1, 2018 KG1, 2018 JZ1, 2018 JQ1, 2018 JP1, 2018 JM1, 2018 JK3, 2018 JJ3, 2018 JJ2, 2018 JH3, 2018 JH2, 2018 JF2, 2018 JE5, 2018 JE1, 2018 JE, 2018 JD2, 2018 HS3, 2018 HH, 2018 GZ3, 2018 FS3, 2018 ER4, 2018 EJ4, 2018 DB2, 2016 LC11
673!Jana Pittichova Chesley via Table Mtn. Obs. in southern California, 1 in MPEC 2018-K50 -- 2018 KH1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-K61 -- 2016 JN34
L01Visnjan Obs., 5 in MPECs 2018-K52, 2018-K53, 2018-K57, 2018-K58 & 2018-K59 -- 2018 KQ1, 2018 KM1, 2018 KL1, 2018 KK1, 2018 KG1
718Wiggins Obs. in Utah, 1 in MPEC 2018-K53 -- 2018 KM1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 May '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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 Sentry15552101-210111.403e-06-6.44-6.440JPL: Computed at 08:51 today Pacific time based on 84 observations spanning 1.6724 days (2018-May-19.30836 to 2018-May-20.980714). Diameter approximately 0.026 km. from weighted mean H=25.55.
NEODyS1555210111.3e-06-6.45-6.450NEODyS: "Based on 73 optical observations (of which 1 are rejected as outliers) from 2018-05-19.304 to 2018-05-20.599."
2018 KB1NEODyS1555207412.38e-10-7.30-7.30NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2018-05-17.424 to 2018-05-20.425."
2018 JNJPL Sentry15552100-210015.521e-07-6.62-6.620JPL: Computed at 08:32 today Pacific time based on 125 observations spanning 15.910 days (2018-May-05.42349 to 2018-May-21.33377). Diameter approximately 0.033 km. from weighted mean H=25.04.

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 21 May '18

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

2330Noted Radar Astrometry database update - see above
2300Noted Radar Astrometry database update - see above
2230Noted Radar Astrometry database update - see above
2201Noted Radar Astrometry database update - see above
2103Noted Radar Astrometry database update - see above
2030Grabbed MPEC 2018-K60 - 2015 MD131 - see above
Grabbed MPEC 2018-K61 - 2016 JN34 - see above
Grabbed MPEC 2018-K62 - 2017 QS17 - see above
Noted Radar Astrometry database update - see above
1812Generated Traffic Report
1555Noted that JPL Sentry has updated its 2018 JN risk assessment - see above
Noted that NEODyS has posted 2018 KB1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 KF1 risk assessment - see above
Noted that NEODyS has posted 2018 KF1 as an impact risk - see above
Grabbed MPEC 2018-K49 - Daily Orbit Update - see above
Grabbed MPEC 2018-K50 - 2018 KH1 - see above
Grabbed MPEC 2018-K51 - 2018 KJ1 - see above
Grabbed MPEC 2018-K52 - 2018 KL1 - see above
Grabbed MPEC 2018-K53 - 2018 KM1 - see above
Grabbed MPEC 2018-K54 - 2018 KN1 - see above
Grabbed MPEC 2018-K55 - 2018 KO1 - see above
Grabbed MPEC 2018-K56 - 2018 KP1 - see above
Grabbed MPEC 2018-K57 - 2018 KQ1 - see above
Grabbed MPEC 2018-K58 - 2018 KG1 - see above
Grabbed MPEC 2018-K59 - 2018 KK1 - see above
0333Grabbed MPEC 2018-K48 - 2015 TF202 - see above