Contents  on 19 April '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 19 April '18

Five objects reported inside ten LD

Five asteroids are reported inside ten lunar distances (LD) of Earth today. Nearest is 2018 GK4, which moves away from 6.66 to 8.09 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
3.62 LD April 14 2018 GD5 9 m  7.51 to 8.72 LD April 7 - 21 NHATS target
4.06 LD April 3 2018 GE 11 m  7.77 to 8.14 LD March 13 - April 24 NHATS target - DOU
5.87 LD April 17 2018 GK4 20 m  6.66 to 8.09 LD April 14 - 21
8.52 LD tomorrow 2018 GS3 23 m  8.88 from 11.00 LD today - April 21 enters ten LD - DOU
8.97 LD April 17 2018 GC2 15 m  9.13 to 9.40 LD April 13 - 21 NHATS target - DOU

This report was generated at 1816 UTC with first follow-up for inbound 2018 GS3 and approaching risk-listed 2018 GG4 in today's DOU MPEC along with continuing follow-up for approaching 2018 EJ4, outbound objects 2018 GC2 and risk-listed 2018 GE, and departed risk-listed 2018 GE2.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.70 LD April 23 2018 GG4 19 m  15.74 from 18.52 LD April 22 - 24 risk - DOU
6.2   LD May 8* 2016 JQ5 8 m  44.3 from 46.8 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  24.02 from 25.14 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  40.99 from 43.15 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  130.02 from 134.05 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 186 m  68.4 from 69.6 LD June 4 - 16 EPU +/- 6 mins.*, radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  46.00 from 46.67 LD June 6 - 15 NHATS target
* EPU = Earth passage uncertainty



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 19 April '18

The MPC's NEO Confirmation Page has 39 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 39 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 41 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 19 April '18

Minor Planet Electronic Circulars

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


<< DOU on 19 Apr. '18 >>  MPEC 2018-H41 - "12:03 UT" - Daily Orbit Update


MPEC 2018-H40 - "10:26 UT" - 2017 DO36

Observers  on 19 April '18

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 10 in MPEC 2018-H41 -- 2018 FY1, 2018 DX3, 2018 BY2, 513497, 498548, 475967, 164121, 138847, 9856, 1866
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2018-H41 -- 2018 GH1, 2018 FV3, 2018 FJ5, 2018 EA4, 2018 BN3, 2017 XJ62, 2017 SW14, 331509, 248083
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2018-H41 -- 2018 BY2, 194126, 138847
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2018-H40 -- 2017 DO36
160Castelmartini Obs. in Italy, 3 in MPEC 2018-H41 -- 2018 BY2, 172034, 9856
703Catalina Sky Survey (CSS) in Arizona, 24 in MPEC 2018-H41 -- 2018 GZ3, 2018 GF4, 2018 FQ5, 2018 DX3, 2016 HJ19, 2016 CX264, 2012 FN62, 2009 SK104, 2005 FN4, 85628, 66251, 498548, 36183, 350462, 337084, 276770, 248926, 172034, 162635, 159533, 138847, 12923, 1627, 1036
309'Martin Altmann in Germany via Cerro Paranal in Chile, 2 in MPEC 2018-H41 -- 277142, 154590
151Eschenberg Obs. in Switzerland, 3 in MPEC 2018-H41 -- 2018 GJ1, 2018 BY2, 2017 BD29
203GiaGa Obs. in Italy, 2 in MPEC 2018-H41 -- 2018 GJ1, 2018 BY2
246KLENOT in the Czech Republic, 14 in MPEC 2018-H41 -- 2018 GY1, 2018 GT1, 2018 GS3, 2018 GR2, 2018 GL4, 2018 GJ1, 2018 GH, 2018 GG2, 2018 GF4, 2018 GE2, 2018 GB2, 2018 GA5, 2018 FS3, 2005 FN4
K22Les Barres Obs. in France, 1 in MPEC 2018-H41 -- 1627
J136Martin Altman in Germany via the Liverpool Telescope in the Canary Islands, 1 in MPEC 2018-H41 -- 277142
K38M57 Obs. in Italy, 1 in MPEC 2018-H41 -- 2018 FS3
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPEC 2018-H41 -- 2018 GL4, 2018 GL, 2018 EJ4, 2011 GC60, 2009 FG1, 68346, 516155, 416801, 27346, 219021, 164207, 152964
C47Nonndorf Obs. in Austria, 2 in MPEC 2018-H41 -- 2018 GY1, 2018 GL4
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-H41 -- 2018 FQ5, 2018 BY2, 85953
I41Palomar Transient Factory (PTF) in southern California, 4 in MPEC 2018-H41 -- 2018 GG2, 2018 EJ4, 508767, 1866
W98Polonia Obs. in Chile, 1 in MPEC 2018-H41 -- 350462
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2018-H41 -- 2013 JN22, 8709
Y28Sertao de Itaparica Obs. in Brazil, 1 in MPEC 2018-H41 -- 2018 GG2
510Siegen Obs. in Germany, 1 in MPEC 2018-H41 -- 1627
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-H41 -- 2018 GE2
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-H41 -- 2017 DO36
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2018-H41 -- 2018 GY1, 2018 GR4, 2018 GL2, 2018 GE2, 2018 GE, 2018 FU, 2018 FS3, 2013 US3, 488490
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-H41 -- 2018 CE2
I52Steward Obs. Mt. Lemmon Station in Arizona, 43 in MPEC 2018-H41 -- 2018 GZ4, 2018 GZ3, 2018 GY4, 2018 GX4, 2018 GW3, 2018 GW, 2018 GT4, 2018 GT3, 2018 GT1, 2018 GS4, 2018 GS3, 2018 GS1, 2018 GR4, 2018 GR1, 2018 GQ2, 2018 GO4, 2018 GN4, 2018 GL4, 2018 GL1, 2018 GL, 2018 GK1, 2018 GJ5, 2018 GJ4, 2018 GJ2, 2018 GJ, 2018 GH4, 2018 GH, 2018 GG5, 2018 GG4, 2018 GG2, 2018 GF4, 2018 GE5, 2018 GE2, 2018 GC5, 2018 GC2, 2018 GC, 2018 GB5, 2018 GA5, 2018 GA4, 2018 FL3, 2018 FB1, 2018 AZ, 2017 UK6
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 6 in MPEC 2018-H41 -- 2018 GR4, 2018 GL2, 2018 GG4, 2018 GE2, 2018 GA5, 2017 GT5
C51WISE in Earth polar orbit, 2 in MPEC 2018-H41 -- 99935, 90367
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 April '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 GA5JPL Sentry16302080-209921.3996e-09-5.62-5.690JPL: Computed at 08:26 today Pacific time based on 39 observations spanning 5.9739 days (2018-Apr-13.46779 to 2018-Apr-19.44166). Diameter approximately 0.730 km. from weighted mean H=18.32.
NEODyS16302080-209922.43e-09-5.45-5.580NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2018-04-13.469 to 2018-04-18.343."
2018 GR4JPL Sentry16302048-2097360.00014167904-4.99-5.320JPL: Computed at 08:39 today Pacific time based on 37 observations spanning 7.0470 days (2018-Apr-12.31705 to 2018-Apr-19.36401). Diameter approximately 0.014 km. from weighted mean H=26.97.
NEODyS16302048-21181847.52e-05-5.27-6.04n/aNEODyS: "Based on 25 optical observations (of which 1 are rejected as outliers) from 2018-04-12.318 to 2018-04-18.442."
2018 GG4JPL Sentry16302058-205811.004e-07-7.38-7.380JPL: Computed at 08:57 today Pacific time based on 18 observations spanning 5.8617 days (2018-Apr-13.43759 to 2018-Apr-19.29928). Diameter approximately 0.019 km. from weighted mean H=26.27.
2018 GL2JPL Sentry16302050-209368.627755e-06-4.74-4.780JPL: Computed at 08:33 today Pacific time based on 54 observations spanning 8.0465 days (2018-Apr-11.23475 to 2018-Apr-19.28129). Diameter approximately 0.049 km. from weighted mean H=24.20.
NEODyS16302059-2094103.84e-06-5.09-5.140NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2018-04-11.236 to 2018-04-18.398."
2018 GE2JPL Sentry16302057-2117940.000107968514-5.24-6.040JPL: Computed at 08:50 today Pacific time based on 64 observations spanning 8.7684 days (2018-Apr-10.40973 to 2018-Apr-19.17814). Diameter approximately 0.014 km. from weighted mean H=26.97.
NEODyS16302054-21182519.84e-05-5.19-5.83n/aNEODyS: "Based on 48 optical observations (of which 2 are rejected as outliers) from 2018-04-10.411 to 2018-04-17.876."
2018 GY1NEODyS1630R E M O V E D-
2018 GENEODyS1630R E M O V E D-
2008 USJPL Sentry16302019-2069296.5255251e-06-6.95-7.370JPL: Computed at 14:44 April 7th of 2017 Pacific time based on 15 observations spanning .08144 days (2008-Oct-21.35391 to 2008-Oct-21.43535). Diameter approximately 0.002 km. from weighted mean H=31.42.
NEODyS16302019-2087494.1e-06-7.76-8.140NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2008-10-21.355 to 2008-10-21.436."

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 19 April '18

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

1816Generated Traffic Report
1630Noted that JPL Sentry has updated its 2008 US risk assessment - see above
Noted that NEODyS has updated its 2008 US risk assessment - see above
Noted that JPL Sentry has updated its 2018 GA5 risk assessment - see above
Noted that NEODyS has updated its 2018 GA5 risk assessment - see above
Noted that NEODyS has removed 2018 GE as an impact risk - see above
Noted that JPL Sentry has updated its 2018 GE2 risk assessment - see above
Noted that NEODyS has updated its 2018 GE2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 GG4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 GL2 risk assessment - see above
Noted that NEODyS has updated its 2018 GL2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 GR4 risk assessment - see above
Noted that NEODyS has updated its 2018 GR4 risk assessment - see above
Noted that NEODyS has removed 2018 GY1 as an impact risk - see above
Grabbed MPEC 2018-H40 - 2017 DO36 - see above
Grabbed MPEC 2018-H41 - Daily Orbit Update - see above