Contents  on 20 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 20 April '18

Seven objects reported inside ten LD

There are seven planetesimals reported inside ten lunar distances (LD) of our planet today, all of them beyond eight LD. Nearest is 2018 GK4, outbound from 8.09 to 9.92 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
2.85 LD April 15 2018 HM 11 m  9.51 to 11.52 LD April 11 - 20 NEW, exits ten LD - MPEC
3.62 LD April 14 2018 GD5 9 m  8.72 to 9.96 LD April 7 - 21 NHATS target
4.06 LD April 3 2018 GE 11 m  8.14 to 8.51 LD March 13 - April 24 NHATS target
5.87 LD April 17 2018 GK4 20 m  8.09 to 9.92 LD April 14 - 21
7.99 LD tomorrow 2018 HN 35 m  8.20 from 8.97 LD yesterday - April 24 NEW - MPEC
8.52 LD today 2018 GS3 23 m  8.52 LD yesterday - tomorrow Earth closest at 1337 UTC
8.97 LD April 17 2018 GC2 15 m  9.40 to 9.79 LD April 13 - 21 NHATS target

This report was generated at 1816 UTC with the discoveries of inbound 2018 HN (MPEC), outbound 2018 HM (MPEC), and already departed 2018 HO (MPEC), which slipped past us at 7.56 LD on April 12th. Today's DOU MPEC has follow-up for four approaching objects (see the table immediately below) and for departed objects 2018 FN3 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
9.72 LD April 23 2018 GG4 19 m  13.27 from 15.77 LD April 22 - 24 risk - DOU
6.2   LD May 8* 2016 JQ5 8 m  41.8 from 44.3 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  22.92 from 24.02 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  38.85 from 40.99 LD May 5 - 13 DOU
9.50 LD May 29 68347 2001 KB67 371 m  126.05 from 130.02 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 186 m  67.1 from 68.4 LD June 4 - 16 EPU +/- 6 mins.*, radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  45.32 from 46.00 LD June 6 - 15 NHATS target - DOU
* EPU = Earth passage uncertainty


<< Reading:  Among several science preprints posted today related to small bodies are two about connecting phenomena with sources. One is about linking meteor showers with active asteroids, dormant comets, and historic disintegration events, and the other looks at locating regions in the Solar System from where meteorites come.



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 20 April '18

The MPC's NEO Confirmation Page has 29 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 29 objects listed. Of these, thirteen 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 20 April '18

Minor Planet Electronic Circulars

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


MPEC 2018-H55 - "17:27 UT" - Comet C/2018 EF9 (Lemmon)


MPEC 2018-H54 - "16:47 UT" - Comet Magnitudes and A/ Objects


MPEC 2018-H53 - "15:52 UT" - 2018 GX5


MPEC 2018-H52 - "15:37 UT" - 2018 HM


MPEC 2018-H51 - "15:33 UT" - 2018 HP


MPEC 2018-H50 - "15:30 UT" - 2018 HO


MPEC 2018-H49 - "15:26 UT" - 2018 HN


MPEC 2018-H48 - "15:23 UT" - 2018 HL


MPEC 2018-H47 - "15:19 UT" - 2018 HK


MPEC 2018-H46 - "15:16 UT" - 2018 HJ


MPEC 2018-H45 - "15:13 UT" - 2018 HH


MPEC 2018-H44 - "15:10 UT" - 2018 GW5


MPEC 2018-H43 - "15:06 UT" - 2018 GV5


<< DOU on 20 Apr. '18 >>  MPEC 2018-H42 - "12:03 UT" - Daily Orbit Update

Observers  on 20 April '18

A total of 62 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-H49 -- 2018 HN
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2018-H42 & 2018-H55 -- 2018 GJ5, 2018 GG5, 2018 FV3, C/2018 EF9, 2017 XJ62, 2017 SO17, 2013 LK25
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2018-H42 -- 2018 BY2, 194126, 9856
K46Bamberg Obs. in Germany, 1 in MPEC 2018-H42 -- 1627
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-H49 -- 2018 HN
B88Bigmuskie Obs. in Italy, 1 in MPEC 2018-H42 -- 144332
160Castelmartini Obs. in Italy, 7 in MPECs 2018-H42 & 2018-H49 -- 2018 HN, 85628, 66251, 388945, 337084, 194126, 1627
703Catalina Sky Survey (CSS) in Arizona, 17 in MPECs 2018-H42 & 2018-H49 -- 2018 HN, 2018 GL4, 2018 EJ4, 2017 WH14, 2015 RL82, 2015 DP155, 85953, 444193, 37655, 337228, 285339, 185853, 153195, 152964, 152931, 11066, 1866
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 8 in MPECs 2018-H42, 2018-H44, 2018-H45 & 2018-H48 -- 2018 HL, 2018 HH, 2018 GW5, 2018 GL2, 2018 GK2, 2018 GA2, 2018 FJ4, 2000 WO148
K51Celado Obs. in Italy, 3 in MPECs 2018-H45, 2018-H49 & 2018-H50 -- 2018 HO, 2018 HN, 2018 HH
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 18 in MPECs 2018-H42, 2018-H43, 2018-H44, 2018-H45, 2018-H46 & 2018-H47 -- 2018 HK, 2018 HJ, 2018 HH, 2018 GZ4, 2018 GY4, 2018 GW5, 2018 GV5, 2018 GN4, 2018 GM2, 2018 GJ2, 2018 GJ, 2018 GG4, 2018 FU4, 2018 FN3, 2018 FM4, 2018 FH5, 2018 FE5, 2017 XQ2
G58Chabot Obs. in northern California, 1 in MPEC 2018-H42 -- 2018 EE
850Cordell-Lorenz Obs. in Tennessee, 3 in MPECs 2018-H42, 2018-H49 & 2018-H53 -- 2018 HN, 2018 GX5, 2018 GG5
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-H49 -- 2018 HN
G37Discovery Channel Telescope in Arizona, 1 in MPEC 2018-H55 -- C/2018 EF9
734Farpoint Obs. in Kansas, 7 in MPECs 2018-H42, 2018-H47, 2018-H48, 2018-H49, 2018-H50, 2018-H51 & 2018-H52 -- 2018 HP, 2018 HO, 2018 HN, 2018 HM, 2018 HL, 2018 HK, 2016 GH135
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2018-H49 & 2018-H55 -- 2018 HN, C/2018 EF9
203GiaGa Obs. in Italy, 1 in MPEC 2018-H49 -- 2018 HN
K88GINOP-KHK in Hungary, 1 in MPEC 2018-H55 -- C/2018 EF9
J95Great Shefford Obs. in England, 2 in MPECs 2018-H49 & 2018-H50 -- 2018 HO, 2018 HN
A17Guidestar Obs. in Germany, 1 in MPEC 2018-H49 -- 2018 HN
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-H55 -- C/2018 EF9
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 4 in MPECs 2018-H42, 2018-H45, 2018-H49 & 2018-H53 -- 2018 HN, 2018 HH, 2018 GX5, 212359
246KLENOT in the Czech Republic, 13 in MPECs 2018-H42, 2018-H45, 2018-H49 & 2018-H53 -- 2018 HN, 2018 HH, 2018 GZ3, 2018 GY1, 2018 GX5, 2018 GS1, 2018 GR2, 2018 GL, 2018 GJ1, 2018 GG5, 2018 GE2, 2018 FS3, 2008 GB110
W87LCO Cerro Tololo C in Chile, 2 in MPEC 2018-H42 -- 2004 FJ29, 267940
Q63LCO Siding Spring A in New South Wales, 2 in MPEC 2018-H42 -- 2004 FJ29, 267940
K38M57 Obs. in Italy, 4 in MPECs 2018-H42, 2018-H45 & 2018-H53 -- 2018 HH, 2018 GX5, 2018 EJ4, 2009 SK104
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2018-H43, 2018-H48, 2018-H49, 2018-H50, 2018-H52 & 2018-H55 -- 2018 HO, 2018 HN, 2018 HM, 2018 HL, 2018 GV5, C/2018 EF9
932McCarthy Obs. in Connecticut, 1 in MPEC 2018-H49 -- 2018 HN
711McDonald Obs. in Texas, 1 in MPEC 2018-H55 -- C/2018 EF9
900Moriyama Obs. in Japan, 1 in MPEC 2018-H49 -- 2018 HN
G84Mt. Lemmon SkyCenter in Arizona, 1 in MPEC 2018-H42 -- 242643
G96Mt. Lemmon Survey (MLS) in Arizona, 21 in MPECs 2018-H42, 2018-H44, 2018-H45, 2018-H46, 2018-H48, 2018-H50, 2018-H51, 2018-H52, 2018-H53 & 2018-H55 -- 2018 HP, 2018 HO, 2018 HM, 2018 HL, 2018 HJ, 2018 HH, 2018 GZ3, 2018 GX5, 2018 GW5, 2018 GG4, 2018 FN4, C/2018 EF9, 2018 DX3, 2012 HM1, 2009 SK104, 85490, 204232, 154656, 141531, 5626, 1036
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-H49 -- 2018 HN
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-H49 -- 2018 HN
Z80Northolt Branch Obs. in England, 4 in MPECs 2018-H42 & 2018-H49 -- 2018 HN, 2013 US3, 374851, 212359
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2018-H49 -- 2018 HN
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2018-H43, 2018-H46, 2018-H47 & 2018-H55 -- 2018 HK, 2018 HJ, 2018 GV5, C/2018 EF9
K63Pascoli Obs. in Italy, 2 in MPECs 2018-H45 & 2018-H49 -- 2018 HN, 2018 HH
A53Peschiera del Garda Obs. in Italy, 1 in MPEC 2018-H42 -- 2018 BY2
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 2 in MPECs 2018-H48 & 2018-H55 -- 2018 HL, C/2018 EF9
K81PMPHR Obs., 1 in MPEC 2018-H42 -- 138847
D29Purple Mtn. Obs. Xuyi Station in China, 6 in MPECs 2018-H42 & 2018-H53 -- 2018 GX5, 2013 JN22, 2008 GB110, 2005 FN4, 330659, 8709
L04ROASTERR-1 in Romania, 1 in MPEC 2018-H49 -- 2018 HN
K61Rokycany Obs. in the Czech Republic, 3 in MPECs 2018-H45, 2018-H49 & 2018-H53 -- 2018 HN, 2018 HH, 2018 GX5
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2018-H48, 2018-H49 & 2018-H50 -- 2018 HO, 2018 HN, 2018 HL
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-H45 -- 2018 HH
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2018-H45 -- 2018 HH
C95SATINO-1 in France, 2 in MPECs 2018-H45 & 2018-H49 -- 2018 HN, 2018 HH
204Schiaparelli Obs. in Italy, 5 in MPECs 2018-H45, 2018-H48, 2018-H49, 2018-H50 & 2018-H52 -- 2018 HO, 2018 HN, 2018 HM, 2018 HL, 2018 HH
033Schwarzschild Obs. in Germany, 9 in MPECs 2018-H44, 2018-H45, 2018-H46, 2018-H47, 2018-H48, 2018-H49, 2018-H50, 2018-H53 & 2018-H55 -- 2018 HO, 2018 HN, 2018 HL, 2018 HK, 2018 HJ, 2018 HH, 2018 GX5, 2018 GW5, C/2018 EF9
645Sloan Digital Sky Survey in New Mexico, 1 in MPEC 2018-H42 -- 2013 CL89
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPEC 2018-H42 -- 2018 FQ5, 2018 EB
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-H49 -- 2018 HN
587Sormano Obs. in Italy, 3 in MPECs 2018-H45, 2018-H49 & 2018-H50 -- 2018 HO, 2018 HN, 2018 HH
691Spacewatch 0.9m telescope in Arizona, 15 in MPEC 2018-H42 -- 2018 GY1, 2018 GX4, 2018 GT3, 2018 GS1, 2018 GE2, 2018 GA4, 2018 FO5, 2018 FB1, 2018 EQ4, 2018 EM2, 2018 EE, 2018 CZ13, 2016 CX264, 498548, 488490
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-H42 -- 2018 GA5
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2018-H42 & 2018-H49 -- 2018 HN, 38091
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2018-H49 & 2018-H53 -- 2018 HN, 2018 GX5
I52Steward Obs. Mt. Lemmon Station in Arizona, 34 in MPECs 2018-H42, 2018-H43, 2018-H44, 2018-H45, 2018-H46, 2018-H47, 2018-H48, 2018-H49, 2018-H50, 2018-H51, 2018-H52, 2018-H53 & 2018-H55 -- 2018 HP, 2018 HO, 2018 HN, 2018 HM, 2018 HL, 2018 HK, 2018 HJ, 2018 HH, 2018 HC, 2018 HB, 2018 GZ3, 2018 GX5, 2018 GW5, 2018 GW4, 2018 GV5, 2018 GR5, 2018 GR4, 2018 GR1, 2018 GL4, 2018 GJ2, 2018 GH5, 2018 GH2, 2018 GG5, 2018 GG1, 2018 GF4, 2018 GE2, 2018 GD3, 2018 GA5, 2018 FV4, 2018 FC1, C/2018 EF9, 2018 EB, 2017 DO36, 2014 TF64
673!Jana Pittichova Chesley via Table Mtn. Obs. in southern California, 1 in MPEC 2018-H42 -- 2013 US3
L01Visnjan Obs., 7 in MPECs 2018-H45, 2018-H48, 2018-H49, 2018-H50, 2018-H51, 2018-H52 & 2018-H53 -- 2018 HP, 2018 HO, 2018 HN, 2018 HM, 2018 HL, 2018 HH, 2018 GX5
C51WISE in Earth polar orbit, 1 in MPEC 2018-H55 -- C/2018 EF9
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 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 Sentry16062099-209918.722e-10-5.85-5.850JPL: Computed at 08:16 today Pacific time based on 46 observations spanning 6.9461 days (2018-Apr-13.46779 to 2018-Apr-20.41389). Diameter approximately 0.730 km. from weighted mean H=18.34.
NEODyS16062080-209921.01e-09-5.85-5.880NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2018-04-13.469 to 2018-04-19.442."
2018 GR4JPL Sentry16062048-2118410.00014456518-4.98-5.310JPL: Computed at 08:30 today Pacific time based on 41 observations spanning 7.9723 days (2018-Apr-12.31705 to 2018-Apr-20.28936). Diameter approximately 0.014 km. from weighted mean H=26.96.
NEODyS16062048-21181981.19e-04-5.09-5.5n/aNEODyS: "Based on 37 optical observations (of which 1 are rejected as outliers) from 2018-04-12.318 to 2018-04-19.365."
2018 GG4JPL Sentry16062058-207022.6846e-07-6.96-7.070JPL: Computed at 08:17 today Pacific time based on 24 observations spanning 5.9816 days (2018-Apr-13.43759 to 2018-Apr-19.41921). Diameter approximately 0.019 km. from weighted mean H=26.24.
NEODyS1606205819.39e-08-7.41-7.410NEODyS: "Based on 21 optical observations (of which 1 are rejected as outliers) from 2018-04-13.438 to 2018-04-19.300."
2018 GL2JPL Sentry16062050-209368.62239e-06-4.74-4.790JPL: Computed at 08:04 today Pacific time based on 57 observations spanning 8.9339 days (2018-Apr-11.23475 to 2018-Apr-20.16864). Diameter approximately 0.049 km. from weighted mean H=24.21.
NEODyS16062060-2118134.01e-06-5.07-5.14n/aNEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2018-04-11.236 to 2018-04-19.282."
2018 GE2JPL Sentry16062057-2117910.000100706216-5.29-5.970JPL: Computed at 08:20 today Pacific time based on 75 observations spanning 9.8516 days (2018-Apr-10.40973 to 2018-Apr-20.26136). Diameter approximately 0.013 km. from weighted mean H=27.05.
NEODyS16062054-21182469.46e-05-5.26-5.82n/aNEODyS: "Based on 64 optical observations (of which 2 are rejected as outliers) from 2018-04-10.411 to 2018-04-19.179."

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 20 April '18

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

1836Grabbed MPEC 2018-H55 - Comet C/2018 EF9 (Lemmon) - see above
1816Generated Traffic Report
1734Grabbed MPEC 2018-H54 - Comet Magnitudes and A/ Objects - see above
1606Noted 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 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 NEODyS 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
Grabbed MPEC 2018-H42 - Daily Orbit Update - see above
Grabbed MPEC 2018-H43 - 2018 GV5 - see above
Grabbed MPEC 2018-H44 - 2018 GW5 - see above
Grabbed MPEC 2018-H45 - 2018 HH - see above
Grabbed MPEC 2018-H46 - 2018 HJ - see above
Grabbed MPEC 2018-H47 - 2018 HK - see above
Grabbed MPEC 2018-H48 - 2018 HL - see above
Grabbed MPEC 2018-H49 - 2018 HN - see above
Grabbed MPEC 2018-H50 - 2018 HO - see above
Grabbed MPEC 2018-H51 - 2018 HP - see above
Grabbed MPEC 2018-H52 - 2018 HM - see above
Grabbed MPEC 2018-H53 - 2018 GX5 - see above