Contents  on 8 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 8 April '18

One object reported inside ten LD

One asteroidal object is reported less than ten lunar distances (LD) from Earth today. 2018 GE is outbound from 4.48 to 4.68 LD.

Neighborhood Traffic
Earth passage I D ~Size Distance today  Inside ten LD Notes
4.06 LD April 3 2018 GE 12 m  4.48 to 4.68 LD March 13 - April 24 NHATS target - DOU

This report was generated at 1845 UTC with the discovery announced yesterday of approaching risk-listed 2018 GG (MPEC), and with first follow-up for outbound 2018 GE in today's DOU MPEC along with continuing follow-up for approaching objects 2018 EJ4 and 2015 DP155, and for distant objects 2017 DC36 and 2016 SR2.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
4.69 LD April 11 2018 GG 42 m  10.24 from 13.10 LD tomorrow - April 14 NEW, risk - MPEC
9.24 LD April 14 2014 UR 16 m  10.64 from 11.17 LD April 10 - 18 NHATS target
6.2   LD May 8* 2016 JQ5 8 m  73.6 from 76.5 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  36.42 from 37.56 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  65.78 from 68.17 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  177.70 from 182.42 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 184 m  82.0 from 83.3 LD June 4 - 16 EPU +/- 20 mins.*, radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  53.30 from 53.97 LD June 6 - 15 NHATS target - DOU
* 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. "Distant" is used here to describe objects that have approached Earth within ten LD since A/CC began these traffic reports eleven years ago but are not presently coming so close. 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 8 April '18

The MPC's NEO Confirmation Page has 20 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 20 objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 27 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 8 April '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.


<< DOU on 8 Apr. '18 >>  MPEC 2018-G34 - "12:01 UT" - Daily Orbit Update


MPEC 2018-G33 - "11:25 UT" - 2018 GM


MPEC 2018-G32 - "11:23 UT" - 2018 GL


MPEC 2018-G31 - "04:18 UT" - 2018 GJ


MPEC 2018-G30 - "04:14 UT" - 2000 HO40


MPEC 2018-G29 - "04:02 UT" - 2018 GH

Observers  on 8 April '18

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
K46Bamberg Obs. in Germany, 1 in MPEC 2018-G34 -- 1627
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-G32 -- 2018 GL
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2018-G32 & 2018-G34 -- 2018 GL, 2018 BY2
107Cavezzo Obs. in Italy, 6 in MPEC 2018-G34 -- 66251, 515049, 497117, 374851, 337084, 194126
K65Cesena Obs. in Italy, 3 in MPECs 2018-G30, 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL, 2000 HO40
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-G34 -- 85953
106Crni Vrh Obs. in Slovenia, 2 in MPECs 2018-G30 & 2018-G33 -- 2018 GM, 2000 HO40
K87Dettelbach Vineyard Obs. in Germany, 3 in MPECs 2018-G30, 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL, 2000 HO40
113Drebach Obs. in Germany, 2 in MPECs 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL
151Eschenberg Obs. in Switzerland, 2 in MPECs 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL
595Farra d'Isonzo Obs. in Italy, 4 in MPECs 2018-G29, 2018-G30, 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL, 2018 GH, 2000 HO40
203GiaGa Obs. in Italy, 1 in MPEC 2018-G33 -- 2018 GM
J95Great Shefford Obs. in England, 4 in MPECs 2018-G29, 2018-G30, 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL, 2018 GH, 2000 HO40
A17Guidestar Obs. in Germany, 10 in MPECs 2018-G32, 2018-G33 & 2018-G34 -- 2018 GM, 2018 GL, 2018 FS3, 2018 FN4, 2018 FJ29, 2018 EB, 2018 CE2, 2015 XE352, 2007 EM, 2005 LH8
C43Hoyerswerda Obs. in Germany, 3 in MPECs 2018-G30, 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL, 2000 HO40
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-G34 -- 337084
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-G34 -- 2018 FN4
246KLENOT in the Czech Republic, 8 in MPECs 2018-G30, 2018-G32, 2018-G33 & 2018-G34 -- 2018 GM, 2018 GL, 2018 GH, 2018 FC1, 2018 FB1, 2018 EE, 2005 FN4, 2000 HO40
046Klet Obs. in the Czech Republic, 5 in MPEC 2018-G34 -- 2018 DX3, 2018 BY2, 2015 XE352, 85953, 163243
K38M57 Obs. in Italy, 2 in MPECs 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2018-G29, 2018-G30 & 2018-G31 -- 2018 GJ, 2018 GH, 2000 HO40
474Mt. John Obs. in New Zealand, 5 in MPEC 2018-G34 -- 2018 FX1, 2018 FH5, 2018 DJ4, 2017 UE45, 2017 DC36
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2018-G29, 2018-G30, 2018-G31, 2018-G33 & 2018-G34 -- 2018 GM, 2018 GJ, 2018 GH, 2000 HO40, 399611, 152964, 11066
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-G34 -- 2018 DX3
C47Nonndorf Obs. in Austria, 3 in MPECs 2018-G29, 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL, 2018 GH
K63Pascoli Obs. in Italy, 2 in MPECs 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2018-G34 -- 2018 FS3, 2018 EE, 2018 DX3, 2018 CE2, 2018 BY2, 2015 DP155, 2012 DG61, 2005 FN4
A48Povegliano Veronese Obs. in Italy, 1 in MPEC 2018-G34 -- 2018 BY2
K61Rokycany Obs. in the Czech Republic, 2 in MPECs 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL
434San Benedetto Po Obs. in Italy, 1 in MPEC 2018-G32 -- 2018 GL
104San Marcello Pistoiese Obs. in Italy, 4 in MPECs 2018-G29, 2018-G30, 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL, 2018 GH, 2000 HO40
587Sormano Obs. in Italy, 3 in MPECs 2018-G30, 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL, 2000 HO40
691Spacewatch 0.9m telescope in Arizona, 8 in MPEC 2018-G34 -- 2018 FV3, 2018 FS3, 2018 FJ4, 2017 TV4, 2017 RP2, 2011 HJ7, 2007 HR, 2002 TC60
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2018-G34 -- 2018 FC2, 2016 SR2
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-G32 -- 2018 GL
I52Steward Obs. Mt. Lemmon Station in Arizona, 20 in MPECs 2018-G29, 2018-G30, 2018-G31, 2018-G32, 2018-G33 & 2018-G34 -- 2018 GM, 2018 GL, 2018 GJ, 2018 GH, 2018 GE, 2018 GD, 2018 GC, 2018 FV4, 2018 FS3, 2018 FO5, 2018 FN4, 2018 FK4, 2018 FJ5, 2018 EM2, 2018 EJ4, 2018 EB, 2018 DK3, 2018 AO18, 2015 GZ45, 2000 HO40
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-G34 -- 2018 FG5
L01Visnjan Obs., 5 in MPECs 2018-G29, 2018-G30, 2018-G31, 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL, 2018 GJ, 2018 GH, 2000 HO40
198Wildberg Obs. in Germany, 2 in MPECs 2018-G32 & 2018-G33 -- 2018 GM, 2018 GL
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 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 GGNEODyS16582086-209551.36e-06-5.73-6.110NEODyS: "Based on 73 optical observations (of which 4 are rejected as outliers) from 2018-04-06.302 to 2018-04-07.810."
2018 GCNEODyS1658208711.52e-09-6.70-6.70NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2018-04-04.162 to 2018-04-08.222."
2018 FJ5JPL Sentry16582084-208412.125e-08-4.89-4.890JPL: Computed at 07:32 today Pacific time based on 68 observations spanning 14.743 days (2018-Mar-24.43016 to 2018-Apr-08.17318). Diameter approximately 0.350 km. from weighted mean H=19.91.
NEODyS1658208413.03e-07-3.71-3.710NEODyS: "Based on 65 optical observations (of which 1 are rejected as outliers) from 2018-03-24.431 to 2018-04-08.174."
2018 FC2JPL Sentry1658R E M O V E DJPL: Risk listing removed at 1433 UTC today
NEODyS1658R E M O V E D-

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 8 April '18

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

1845Generated Traffic Report
1658Noted that JPL Sentry has removed 2018 FC2 as an impact risk - see above
Noted that NEODyS has removed 2018 FC2 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 FJ5 risk assessment - see above
Noted that NEODyS has updated its 2018 FJ5 risk assessment - see above
Noted that NEODyS has updated its 2018 GC risk assessment - see above
Noted that NEODyS has posted 2018 GG as an impact risk - see above
Grabbed MPEC 2018-G32 - 2018 GL - see above
Grabbed MPEC 2018-G33 - 2018 GM - see above
Grabbed MPEC 2018-G34 - Daily Orbit Update - see above
0605Grabbed MPEC 2018-G29 - 2018 GH - see above
Grabbed MPEC 2018-G30 - 2000 HO40 - see above
Grabbed MPEC 2018-G31 - 2018 GJ - see above