Contents  on 15 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 15 May '18

Nine objects reported inside ten LD

Today we have nine visitors known to be less than ten lunar distances (LD) from Earth. Intruder 2010 WC9 is the nearest, coming into the Earth-Moon system from 2.68 to 0.53 LD at 2204 UTC, and ending the day at 0.58 LD from Earth.

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
0.53 LD today 2010 WC9 68 m  0.53 LD May 12 - 19 intruder today, Earth closest at 2204 UTC - DOU
2.08 LD May 9 2018 JP 11 m  9.22 to 10.82 LD May 3 - 15 NHATS target, exits ten LD
2.16 LD May 13 2016 HP6 27 m  3.27 to 4.28 LD May 5 - 20 NHATS target
3.87 LD tomorrow 2018 JX 70 m  3.97 from 5.42 LD May 13 - 19 DOU
4.43 LD May 13 2018 JA1 24 m  4.76 to 5.37 LD May 6 - 20 NHATS target - DOU
5.29 LD May 20 2018 JG1 42 m  9.16 from 10.72 LD today - May 24 enters ten LD, risk - DOU
7.43 LD yesterday 2018 JL1 16 m  7.50 to 7.77 LD May 8 - 19 NHATS target, risk - DOU
8.78 LD yesterday 2018 JY 50 m  8.82 to 9.33 LD May 12 - 16
9.33 LD today 2018 JX1 17 m  9.33 LD May 13 - 17 Earth closest at 0914 UTC

This report was generated at 1940 UTC with follow-up in today's DOU MPEC for one approaching object in the table below and five in the active traffic table above, including intruder 2010 WC9, plus seven departed objects: 2018 JM2, 2018 JK2, 2018 JH1, 2018 JM, 2018 HM2, 388945 2008 TZ3, and risk-listed 2018 JN.

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  40.87 from 43.89 LD May 28 - 30 radar target
5.56 LD June 10 2018 EJ4 186 m  35.68 from 36.98 LD June 4 - 16 radar/NHATS target
8.96 LD June 11 2015 DP155 162 m  26.40 from 27.23 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. 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 15 May '18

The MPC's NEO Confirmation Page has 19 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nineteen objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 28 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 15 May '18

Minor Planet Electronic Circulars

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


MPEC 2018-J86 - "22:00 UT" - 2018 JC3


MPEC 2018-J85 - "21:57 UT" - 2018 JB3


MPEC 2018-J84 - "21:54 UT" - 2018 JA3


MPEC 2018-J83 - "21:52 UT" - 2018 JZ2


MPEC 2018-J82 - "21:48 UT" - 2018 JY2


<< DOU on 15 May '18 >>  MPEC 2018-J81 - "12:06 UT" - Daily Orbit Update

Observers  on 15 May '18

A total of 33 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2018-J81 & 2018-J83 -- 2018 JZ2, 2018 JH1, 2018 HG2, 2018 FJ4, 2018 FB1, 488461
T05ATLAS Haleakala in Hawaii, 12 in MPEC 2018-J81 -- 2018 JA, 2015 DP155, 85989, 475967, 220839, 164201, 164121, 152931, 138847, 8037, 3752, 1866
T08ATLAS Mauna Loa in Hawaii, 15 in MPEC 2018-J81 -- 2018 JX, 2018 JG1, 2018 JF2, 2018 HV2, 85628, 475967, 374851, 36183, 25916, 242643, 163243, 13553, 6053, 1627, 1036
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-J81 -- 2010 WC9
703Catalina Sky Survey (CSS) in Arizona, 20 in MPECs 2018-J81 & 2018-J85 -- 2018 JY1, 2018 JM1, 2018 JE1, 2018 JB3, 2018 JA1, 2016 JP, 2013 QH10, 2001 SC170, 439313, 38091, 37655, 337084, 220839, 164201, 164121, 15745, 138847, 11066, 9856, 3122
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPECs 2018-J82 & 2018-J83 -- 2018 JZ2, 2018 JY2
006Fabra Obs. in Spain, 1 in MPEC 2018-J81 -- 138847
J95Great Shefford Obs. in England, 5 in MPECs 2018-J81, 2018-J84 & 2018-J85 -- 2018 JX, 2018 JL1, 2018 JB3, 2018 JA3, 2010 WC9
H15ISON New Mexico Obs. in New Mexico, 2 in MPEC 2018-J81 -- 455550, 13553
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-J81 -- 2010 WC9
Q66JAXA Janess-G in New South Wales, 2 in MPEC 2018-J81 -- 2018 JX, 66391
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 2 in MPECs 2018-J85 & 2018-J86 -- 2018 JC3, 2018 JB3
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2018-J82, 2018-J83, 2018-J84 & 2018-J86 -- 2018 JZ2, 2018 JY2, 2018 JC3, 2018 JA3
G96Mt. Lemmon Survey (MLS) in Arizona, 22 in MPECs 2018-J81, 2018-J82, 2018-J83, 2018-J84 & 2018-J86 -- 2018 JZ2, 2018 JY2, 2018 JQ1, 2018 JM, 2018 JC3, 2018 JC, 2018 JA3, 2018 CE2, 2017 XH62, 2015 FP118, 2013 JY35, 2009 WL1, 2008 HO3, 2005 JD46, 467309, 36183, 219021, 162635, 162474, 152770, 100004, 2059
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-J81 -- 2010 WC9
C23Olmen Obs. in Belgium, 1 in MPEC 2018-J81 -- 1627
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2018-J81 -- 388945
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2018-J81 -- 2018 HV2, 36183
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-J85 -- 2018 JB3
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2018-J81 & 2018-J86 -- 2018 JC3, 2017 XH62
033Schwarzschild Obs. in Germany, 10 in MPECs 2018-J81, 2018-J82, 2018-J83, 2018-J84, 2018-J85 & 2018-J86 -- 2018 JZ2, 2018 JY2, 2018 JC3, 2018 JB3, 2018 JA3, 2018 JA1, 2018 GQ2, 2018 EQ4, 2001 SC170, 212359
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-J85 -- 2018 JB3
691Spacewatch 0.9m telescope in Arizona, 13 in MPEC 2018-J81 -- 2018 JZ1, 2018 JP1, 2018 JN1, 2018 JG1, 2018 JF1, 2018 JE, 2018 JC, 2018 HR3, 2018 GZ4, 2018 GS1, 2016 CX264, 363790, 155110
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2018-J81 & 2018-J85 -- 2018 JN, 2018 JC2, 2018 JB3, 2018 HU1, 2018 HK, 2018 GM4, 2015 MR101, 2015 HH10, 2009 JL1, 2005 MX1
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2018-J81 -- 2010 WC9
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-J81 -- 2010 WC9
I52Steward Obs. Mt. Lemmon Station in Arizona, 21 in MPECs 2018-J81, 2018-J82, 2018-J83, 2018-J84 & 2018-J86 -- 2018 JZ2, 2018 JY2, 2018 JX, 2018 JQ1, 2018 JO1, 2018 JM2, 2018 JM1, 2018 JL2, 2018 JK2, 2018 JK, 2018 JF2, 2018 JF1, 2018 JF, 2018 JE2, 2018 JE1, 2018 JE, 2018 JC3, 2018 JC2, 2018 JA3, 2018 JA1, 2018 HM2
673!Jana Pittichova Chesley via Table Mtn. Obs. in southern California, 3 in MPECs 2018-J83, 2018-J84 & 2018-J86 -- 2018 JZ2, 2018 JC3, 2018 JA3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-J81 -- 2018 GR4, 2018 GM4
L01Visnjan Obs., 1 in MPEC 2018-J82 -- 2018 JY2
Q65Warrumbungle Obs. in New South Wales, 2 in MPEC 2018-J81 -- 242643, 5604
Z92West Park Obs. in England, 1 in MPEC 2018-J81 -- 2010 WC9
C51WISE in Earth polar orbit, 2 in MPEC 2018-J81 -- 2018 JA, 1036
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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 Sentry16062050-205017.872e-08-5.85-5.850JPL: Computed at 08:50 today Pacific time based on 48 observations spanning 6.0549 days (2018-May-09.32052 to 2018-May-15.37544). Diameter approximately 0.100 km. from weighted mean H=22.66.
NEODyS16062050-209935.6e-08-5.92-5.920NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2018-05-09.321 to 2018-05-14.211."
2018 JZ1NEODyS1606R E M O V E D-
2018 JL1JPL Sentry16062112-211538.3661e-07-7.33-7.510JPL: Computed at 08:39 today Pacific time based on 42 observations spanning 5.6757 days (2018-May-08.26382 to 2018-May-13.939535). Diameter approximately 0.016 km. from weighted mean H=26.67.
2018 JG1JPL Sentry1606R E M O V E DJPL: Risk listing removed at 1533 UTC today
NEODyS1606211822.23e-06-5.84-6.11n/aNEODyS: "Based on 61 optical observations (of which 0 are rejected as outliers) from 2018-05-08.180 to 2018-05-14.269."
2018 JF1NEODyS1606R E M O V E D-
2018 JNJPL Sentry16062100-210422.0247e-06-6.03-6.090JPL: Computed at 08:33 today Pacific time based on 106 observations spanning 9.8500 days (2018-May-05.42349 to 2018-May-15.27347). Diameter approximately 0.034 km. from weighted mean H=24.96.
NEODyS16062088-210432.29e-06-5.96-6.00NEODyS: "Based on 103 optical observations (of which 1 are rejected as outliers) from 2018-05-05.424 to 2018-05-14.331."
2018 HJ2NEODyS1606208518.9e-05-4.00-4.00NEODyS: "Based on 89 optical observations (of which 0 are rejected as outliers) from 2018-04-23.412 to 2018-05-14.259."
2018 HW1NEODyS16062116-211833.18e-07-7.44-7.44n/aNEODyS: "Based on 51 optical observations (of which 0 are rejected as outliers) from 2018-04-23.203 to 2018-05-12.098."
2018 GR4JPL Sentry16062048-2112580.00035062228-4.64-4.920JPL: Computed at 08:43 today Pacific time based on 64 observations spanning 27.981 days (2018-Apr-12.31705 to 2018-May-10.29767). Diameter approximately 0.013 km. from weighted mean H=27.06.
2018 GE2NEODyS16062054-21172186.29e-05-5.46-6.070NEODyS: "Based on 101 optical observations (of which 4 are rejected as outliers) from 2018-04-10.411 to 2018-05-08.371."

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 15 May '18

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

2230Grabbed MPEC 2018-J82 - 2018 JY2 - see above
Grabbed MPEC 2018-J83 - 2018 JZ2 - see above
Grabbed MPEC 2018-J84 - 2018 JA3 - see above
Grabbed MPEC 2018-J85 - 2018 JB3 - see above
Grabbed MPEC 2018-J86 - 2018 JC3 - see above
1940Generated Traffic Report
1606Noted that NEODyS has updated its 2018 GE2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 GR4 risk assessment - see above
Noted that NEODyS has updated its 2018 HJ2 risk assessment - see above
Noted that NEODyS has updated its 2018 HW1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 JC2 risk assessment - see above
Noted that NEODyS has updated its 2018 JC2 risk assessment - see above
Noted that NEODyS has removed 2018 JF1 as an impact risk - see above
Noted that JPL Sentry has removed 2018 JG1 as an impact risk - see above
Noted that NEODyS has updated its 2018 JG1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 JL1 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
Noted that NEODyS has removed 2018 JZ1 as an impact risk - see above
Grabbed MPEC 2018-J81 - Daily Orbit Update - see above