Contents  on 18 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 18 May '18

Six objects reported inside ten LD

There are six small Solar-System bodies reported within ten lunar distances (LD) of Earth today. Nearest is risk-listed 2018 JG1, which is inbound from 6.50 to 5.63 LD, while intruder 2010 WC9 moves away from 5.95 to 8.79 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
0.53 LD May 15 2010 WC9 68 m  5.95 to 8.79 LD May 12 - 19 intruder
2.16 LD May 13 2016 HP6 27 m  6.56 to 7.74 LD May 5 - 20 NHATS target
3.88 LD May 16 2018 JX 70 m  6.30 to 8.78 LD May 13 - 19
4.43 LD May 13 2018 JA1 24 m  7.16 to 8.21 LD May 6 - 20 NHATS target
5.29 LD May 20 2018 JG1 42 m  5.63 from 6.50 LD May 15 - 24 risk
7.43 LD May 14 2018 JL1 15 m  8.84 to 9.58 LD May 8 - 19 NHATS target, risk - DOU

This report was generated at 1918 UTC with first follow-up for departed objects 2018 KC and 2018 JG3 in today's DOU MPEC along with continuing follow-up for three objects in the active traffic tables here and five more that have departed: 2018 JM2, 2018 JR1, 2018 JM, risk-listed 2018 JN, and quite faint risk-listed intruder 2018 EZ2 (extending its observation arc from 36.96 to 65.95 days), plus distant objects 2017 DC36 and 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  31.97 from 34.90 LD May 28 - 30 radar target
5.56 LD June 10 2018 EJ4 186 m  31.76 from 33.07 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  23.92 from 24.75 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 objects that have come within ten LD since A/CC began these traffic reports (2007) but are not so close during their reported apparitions. 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 18 May '18

The MPC's NEO Confirmation Page has 41 listings

When last checked at 2138 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 41 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 44 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 18 May '18

Minor Planet Electronic Circulars

As of last check at 2138 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 18 May '18 >>  MPEC 2018-K14 - "12:07 UT" - Daily Orbit Update

Observers  on 18 May '18

A total of 25 observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2018-K14 -- 2018 JR1, 2018 JK3, 2018 HK, 2018 GC5, 363626
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2018-K14 -- 285339, 220839, 9856
T08ATLAS Mauna Loa in Hawaii, 3 in MPEC 2018-K14 -- 242708, 6456, 1685
K46Bamberg Obs. in Germany, 1 in MPEC 2018-K14 -- 1627
160Castelmartini Obs. in Italy, 3 in MPEC 2018-K14 -- 475967, 220839, 138847
703Catalina Sky Survey (CSS) in Arizona, 19 in MPEC 2018-K14 -- 2018 JS1, 2018 JJ2, 2018 JF2, 2018 BY2, 2017 XH62, 2015 DP155, 2012 FN62, 2002 JR100, 54401, 508767, 475967, 450648, 337084, 186822, 164121, 163243, 8037, 6053, 1627
010!program code "!" (10) via Caussols Obs., 1 in MPEC 2018-K14 -- 2018 GY1
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2018-K14 -- 2018 EZ2
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2018-K14 -- 2018 JZ1, 2018 FE5, 2017 DC36
A17Guidestar Obs. in Germany, 4 in MPEC 2018-K14 -- 2018 JK3, 2018 JE1, 2018 GT1, 2018 EJ4
L09LCO Sutherland Aqawan A#1 in South Africa, 1 in MPEC 2018-K14 -- 66391
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-K14 -- 2011 HS60
C94MASTER-II Tunka in Russia, 1 in MPEC 2018-K14 -- 1866
G96Mt. Lemmon Survey (MLS) in Arizona, 17 in MPEC 2018-K14 -- 2018 JS2, 2018 JN1, 2018 JE, 2018 FO5, 2014 TF64, 2012 NP, 2005 YW93, 66251, 54401, 475967, 333888, 31346, 25916, 253586, 21277, 162998, 141531
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2018-K14 -- 172034, 154268, 1036
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-K14 -- 2018 JK3
033Schwarzschild Obs. in Germany, 1 in MPEC 2018-K14 -- 2011 HS60
Y28Sertao de Itaparica Obs. in Brazil, 1 in MPEC 2018-K14 -- 2018 HJ2
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2018-K14 -- 2018 JO1, 2018 JN, 2018 JE1, 2018 GX4, 2018 GL, 2018 FJ4, 2011 HJ7
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2018-K14 -- 2018 JM2, 2018 JL1, 2018 JC2, 2017 SG14
I52Steward Obs. Mt. Lemmon Station in Arizona, 7 in MPEC 2018-K14 -- 2018 KC, 2018 JP1, 2018 JM, 2018 JL2, 2018 JH3, 2018 JG3, 2011 HS60
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-K14 -- 2018 JN, 2018 JL1
L01Visnjan Obs., 1 in MPEC 2018-K14 -- 2011 HS60
C51WISE in Earth polar orbit, 4 in MPEC 2018-K14 -- 442742, 382503, 212359, 6569
E08Wobblesock Obs. in New South Wales, 1 in MPEC 2018-K14 -- 2018 HV2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 May '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2138 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 Sentry15202050-205011.079e-06-4.75-4.750JPL: Computed at 07:27 today Pacific time based on 62 observations spanning 8.9875 days (2018-May-09.32052 to 2018-May-18.30807). Diameter approximately 0.096 km. from weighted mean H=22.74.
NEODyS1520205011.55e-07-5.61-5.610NEODyS: "Based on 59 optical observations (of which 0 are rejected as outliers) from 2018-05-09.321 to 2018-05-17.371."
2018 JL1JPL Sentry15202112-211845.402104e-06-6.55-6.720JPL: Computed at 07:34 today Pacific time based on 39 observations spanning 7.9781 days (2018-May-08.26382 to 2018-May-16.241941). Diameter approximately 0.015 km. from weighted mean H=26.73.
2018 JG1NEODyS1520211822.29e-06-5.82-5.89n/aNEODyS: "Based on 72 optical observations (of which 0 are rejected as outliers) from 2018-05-08.180 to 2018-05-16.247."
2018 JNJPL Sentry15202100-211221.0075e-06-6.38-6.650JPL: Computed at 07:17 today Pacific time based on 119 observations spanning 12.960 days (2018-May-05.42349 to 2018-May-18.38387). Diameter approximately 0.033 km. from weighted mean H=25.04.
NEODyS15202088-210431.32e-06-6.24-6.260NEODyS: "Based on 114 optical observations (of which 1 are rejected as outliers) from 2018-05-05.424 to 2018-05-16.500."
2018 HJ2JPL Sentry19032085-208519.726e-04-2.98-2.980JPL #2 for the day: Computed at 08:57 today Pacific time based on 95 observations spanning 23.082 days (2018-Apr-23.41101 to 2018-May-16.493045). Diameter approximately 0.044 km. from weighted mean H=24.45.
NEODyS15202085-211421.44e-04-3.83-3.830NEODyS: "Based on 92 optical observations (of which 0 are rejected as outliers) from 2018-04-23.412 to 2018-05-16.494."
2018 EZ2JPL Sentry21382118-211811.248e-08-9.03-9.030JPL #3 for the day: Computed at 13:59 today Pacific time based on 89 observations spanning 65.742 days (2018-Mar-12.62906 to 2018-May-17.371548). Diameter approximately 0.017 km. from weighted mean H=26.55.
2008 VS4JPL Sentry15202018-21143146.040597e-07-5.45-6.320JPL: Computed at 00:23 April 8th of 2017 Pacific time based on 10 observations spanning .08330 days (2008-Nov-07.413 to 2008-Nov-07.4963). Diameter approximately 0.049 km. from weighted mean H=24.22.

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 18 May '18

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

2138Noted that JPL Sentry has updated its 2018 EZ2 risk assessment - see above
1918Generated Traffic Report
1903Noted that JPL Sentry has updated its 2018 EZ2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 HJ2 risk assessment - see above
1520Noted that JPL Sentry has updated its 2008 VS4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 EZ2 risk assessment - see above
Noted 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 NEODyS has updated its 2018 JC2 risk assessment - 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
Grabbed MPEC 2018-K14 - Daily Orbit Update - see above