Contents  on 18 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 18 April '18

Eight objects reported inside ten LD

There are eight transient natural objects known to be within ten lunar distances (LD) of our planet today today. Nearest is 2018 GK4, outbound from 5.91 to 6.66 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
0.78 LD April 12 2018 GD2 4 m  9.14 to 10.85 LD April 6 - 18 intruder, NHATS target, exits ten LD, risk
3.62 LD April 14 2018 GD5 9 m  6.36 to 7.51 LD April 7 - 21 NHATS target
4.06 LD April 3 2018 GE 11 m  7.40 to 7.77 LD March 13 - April 24 NHATS target, risk - DOU
4.36 LD April 13 2018 GP 13 m  9.95 to 11.75 LD April 8 - 18 exits ten LD
4.80 LD April 13 2018 GV1 12 m  9.36 to 11.11 LD April 9 - 18 exits ten LD
5.87 LD yesterday 2018 GK4 20 m  5.91 to 6.66 LD April 14 - 21
8.97 LD yesterday 2018 GC2 15 m  8.99 to 9.13 LD April 13 - 21 NHATS target
9.24 LD April 14 2014 UR 16 m  9.97 to 10.39 LD April 10 - 18 NHATS target, exits ten LD

This report was updated at 1954 UTC with the discovery of departed 2018 HD (MPEC), which passed Earth at 9.16 LD on April 12th. Your first neighborhood flying rocks traffic report was generated at 1750 UTC with the discovery of already departed 2018 GS5 (MPEC), which flew past us at about 8.4 LD* on April 1st, and with follow-up in today's DOU MPEC for approaching objects 2018 EJ4 and 1999 FN19, outbound risk-listed 2018 GE, and departed objects 2018 GU1, 2018 GZ, and risk-listed 2018 GE2.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
8.51 LD April 20 2018 GS3 21 m  11.00 from 14.25 LD tomorrow - April 21
9.7   LD April 23* 2018 GG4 18 m  18.6 from 21.5 LD April 23 - 24 EPU +/- 5 mins.*, risk
6.2   LD May 8* 2016 JQ5 8 m  46.8 from 49.4 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  25.14 from 26.25 LD May 5 - 9 radar/NHATS target - DOU
6.48 LD May 9 388945 2008 TZ3 282 m  43.15 from 45.33 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  134.05 from 138.14 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 186 m  69.6 from 70.8 LD June 4 - 16 EPU +/- 8 mins.*, radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  46.67 from 47.34 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. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 18 April '18

The MPC's NEO Confirmation Page has 35 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 35 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 53 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 April '18

Minor Planet Electronic Circulars

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


MPEC 2018-H39 - "17:50 UT" - 2018 HE


MPEC 2018-H38 - "17:47 UT" - 2018 HD


MPEC 2018-H37 - "17:43 UT" - 2018 HC


MPEC 2018-H36 - "17:31 UT" - 2018 HB


MPEC 2018-H35 - "17:27 UT" - 2018 GS5


MPEC 2018-H34 - "17:24 UT" - 2018 GR5


MPEC 2018-H33 - "17:20 UT" - 2018 GQ5


MPEC 2018-H32 - "17:17 UT" - 2018 GP5


MPEC 2018-H31 - "17:13 UT" - 2018 GO5


MPEC 2018-H30 - "14:02 UT" - Comet P/2011 CR42 = 2018 H1 (Catalina)


<< DOU on 18 Apr. '18 >>  MPEC 2018-H29 - "12:03 UT" - Daily Orbit Update


MPEC 2018-H28 - "11:41 UT" - 2015 HE170


MPEC 2018-H27 - "02:30 UT" - 2015 SF20


MPEC 2018-H26 - "02:29 UT" - 2015 GW12


MPEC 2018-H25 - "02:27 UT" - 2015 DZ197


MPEC 2018-H24 - "02:25 UT" - 2018 GG2


MPEC 2018-H23 - "02:24 UT" - 2015 FR117


MPEC 2018-H22 - "02:21 UT" - 2014 UM233

Observers  on 18 April '18

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2018-H23, 2018-H31, 2018-H34, 2018-H35, 2018-H36, 2018-H37 & 2018-H39 -- 2018 HE, 2018 HC, 2018 HB, 2018 GS5, 2018 GR5, 2018 GO5, 2015 FR117
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2018-H24 -- 2018 GG2
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-H29 -- 2018 BY2
Z84Calar Alto Schmidt in Spain, 4 in MPECs 2018-H30, 2018-H36, 2018-H37 & 2018-H39 -- 2018 HE, 2018 HC, 2018 HB, P/2018 H1
107Cavezzo Obs. in Italy, 3 in MPEC 2018-H29 -- 2018 BY2, 194126, 138847
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2018-H25, 2018-H27, 2018-H28, 2018-H32 & 2018-H33 -- 2018 GQ5, 2018 GP5, 2015 SF20, 2015 HE170, 2015 DZ197
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-H29 -- 2018 GH
006Fabra Obs. in Spain, 1 in MPEC 2018-H29 -- 475967
A17Guidestar Obs. in Germany, 3 in MPEC 2018-H29 -- 2018 GF4, 2018 EJ4, 2003 FS2
246KLENOT in the Czech Republic, 13 in MPECs 2018-H24, 2018-H29 & 2018-H37 -- 2018 HC, 2018 GZ3, 2018 GY1, 2018 GS4, 2018 GR2, 2018 GL, 2018 GH, 2018 GG2, 2018 GF4, 2018 GE2, 2018 CE2, 2008 GB110, 1999 FN19
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2018-H29 -- 267940
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2018-H29 -- 267940
Q63LCO Siding Spring A in New South Wales, 1 in MPEC 2018-H29 -- 267940
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2018-H29, 2018-H32, 2018-H33, 2018-H34, 2018-H35, 2018-H38 & 2018-H39 -- 2018 HE, 2018 HD, 2018 GY, 2018 GS5, 2018 GR5, 2018 GQ5, 2018 GP5
568@Jean-Marc Petit on Mauna Kea in Hawaii, 1 in MPEC 2018-H22 -- 2014 UM233
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2018-H26 -- 2015 GW12
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2018-H29, 2018-H31, 2018-H32, 2018-H33, 2018-H34, 2018-H35, 2018-H36, 2018-H37, 2018-H38 & 2018-H39 -- 2018 HE, 2018 HD, 2018 HC, 2018 HB, 2018 GS5, 2018 GR5, 2018 GQ5, 2018 GP5, 2018 GO5, 2018 GE
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-H29 -- 212359
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-H29 -- 2018 FQ5
G34Oberfrauendorf Obs. in Germany, 3 in MPEC 2018-H29 -- 2018 DX3, 475967, 138847
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2018-H24, 2018-H26, 2018-H32 & 2018-H39 -- 2018 HE, 2018 GP5, 2018 GG2, 2015 GW12
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2018-H29 -- 2013 JN22, 8709
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-H37 -- 2018 HC
C95SATINO-1 in France, 1 in MPEC 2018-H34 -- 2018 GR5
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-H39 -- 2018 HE
033Schwarzschild Obs. in Germany, 7 in MPECs 2018-H32, 2018-H33, 2018-H34, 2018-H35, 2018-H36, 2018-H37 & 2018-H39 -- 2018 HE, 2018 HC, 2018 HB, 2018 GS5, 2018 GR5, 2018 GQ5, 2018 GP5
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-H24 -- 2018 GG2
291Spacewatch 1.8m telescope in Arizona, 12 in MPEC 2018-H29 -- 2018 GZ, 2018 GR4, 2018 GQ, 2018 GL2, 2018 GL1, 2018 GG2, 2018 GE, 2018 GD, 2018 FV3, 2018 EE, 2013 JN22, 488490
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-H29 -- 2018 BY2, 66251
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2018-H38 -- 2018 HD
I52Steward Obs. Mt. Lemmon Station in Arizona, 15 in MPECs 2018-H29, 2018-H31, 2018-H32, 2018-H33, 2018-H34, 2018-H35, 2018-H36, 2018-H37, 2018-H38 & 2018-H39 -- 2018 HE, 2018 HD, 2018 HC, 2018 HB, 2018 GZ3, 2018 GU1, 2018 GS5, 2018 GR5, 2018 GR1, 2018 GQ5, 2018 GP5, 2018 GO5, 2018 GH, 2018 GA5, 2018 FK29
K41Vegaquattro Obs. in Italy, 1 in MPEC 2018-H29 -- 337084
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 Sentry16002080-209922.3757e-09-5.37-5.550JPL: Computed at 07:34 today Pacific time based on 28 observations spanning 4.8747 days (2018-Apr-13.46779 to 2018-Apr-18.34246). Diameter approximately 0.730 km. from weighted mean H=18.32.
NEODyS16002025-2118598.75e-09-4.73-5.6n/aNEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2018-04-13.469 to 2018-04-16.342."
2018 GR4JPL Sentry16002048-2118519.688213e-05-5.25-6.210JPL: Computed at 07:40 today Pacific time based on 24 observations spanning 6.1186 days (2018-Apr-12.3222 to 2018-Apr-18.4408). Diameter approximately 0.014 km. from weighted mean H=26.89.
2018 GL2JPL Sentry16002050-209357.38469e-06-4.80-4.840JPL: Computed at 07:36 today Pacific time based on 48 observations spanning 7.1625 days (2018-Apr-11.23475 to 2018-Apr-18.39722). Diameter approximately 0.049 km. from weighted mean H=24.19.
2018 GG2NEODyS1600R E M O V E D-
JPL Sentry0406R E M O V E DJPL: Risk listing removed at 0338 UTC today
2018 GE2JPL Sentry16002057-2117890.0001050253242-5.20-5.970JPL: Computed at 07:49 today Pacific time based on 48 observations spanning 7.4659 days (2018-Apr-10.40973 to 2018-Apr-17.87561). Diameter approximately 0.014 km. from weighted mean H=26.87.
2018 GY1NEODyS1600211711.62e-09-7.51-7.510NEODyS: "Based on 72 optical observations (of which 0 are rejected as outliers) from 2018-04-10.290 to 2018-04-17.335."
2018 GQJPL Sentry1600R E M O V E DJPL: Risk listing removed at 1418 UTC today

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 April '18

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

1954Updated Traffic Report
1803Grabbed MPEC 2018-H36 - 2018 HB - see above
Grabbed MPEC 2018-H37 - 2018 HC - see above
Grabbed MPEC 2018-H38 - 2018 HD - see above
Grabbed MPEC 2018-H39 - 2018 HE - see above
1732Grabbed MPEC 2018-H31 - 2018 GO5 - see above
Grabbed MPEC 2018-H32 - 2018 GP5 - see above
Grabbed MPEC 2018-H33 - 2018 GQ5 - see above
Grabbed MPEC 2018-H34 - 2018 GR5 - see above
Grabbed MPEC 2018-H35 - 2018 GS5 - see above
1600Noted that JPL Sentry has updated its 2018 GA5 risk assessment - see above
Noted that NEODyS has posted 2018 GA5 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 GE2 risk assessment - see above
Noted that NEODyS has removed 2018 GG2 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 GL2 risk assessment - see above
Noted that JPL Sentry has removed 2018 GQ as an impact risk - see above
Noted that JPL Sentry has updated its 2018 GR4 risk assessment - see above
Noted that NEODyS has reposted 2018 GY1 as an impact risk - see above
Grabbed MPEC 2018-H28 - 2015 HE170 - see above
Grabbed MPEC 2018-H29 - Daily Orbit Update - see above
Grabbed MPEC 2018-H30 - Comet P/2011 CR42 = 2018 H1 (Catalina) - see above
0406Noted that JPL Sentry has removed 2018 GG2 as an impact risk - see above
Grabbed MPEC 2018-H22 - 2014 UM233 - see above
Grabbed MPEC 2018-H23 - 2015 FR117 - see above
Grabbed MPEC 2018-H24 - 2018 GG2 - see above
Grabbed MPEC 2018-H25 - 2015 DZ197 - see above
Grabbed MPEC 2018-H26 - 2015 GW12 - see above
Grabbed MPEC 2018-H27 - 2015 SF20 - see above