Contents  on 7 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 7 April '18

One object reported inside ten LD

Bulletin - 2212 UTC:  One new discovery of a close passer has been announced.

Earth passageI D~Size~Inside ten LDNotes
4.69 LD at 2200 UTC April 112018 GG41 m tomorrow - April 15MPEC


One planetesimal is known to be within ten lunar distances (LD) of our home world today. 2018 GE is outbound from 4.32 to 4.48 LD.

Neighborhood Traffic
Earth passage I D ~Size Distance today  Inside ten LD Notes
4.1   LD April 3* 2018 GE 12 m  4.3 to 4.5 LD March 13 - April 24 EPU +/- 15 mins.*

This report was generated at 1748 UTC with follow-up in today's DOU MPEC for approaching objects 2018 EJ4 and 2015 DP155, departed 2018 FQ4 (now no longer risk-listed), and distant 450894 2008 BT18.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.24 LD April 14 2014 UR 16 m  11.17 from 11.75 LD April 10 - 18 NHATS target
6.2   LD May 8* 2016 JQ5 8 m  76.5 from 79.3 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  37.56 from 38.70 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  68.17 from 70.57 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  182.42 from 187.20 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 182 m  83.3 from 84.6 LD June 4 - 16 EPU +/- 24 mins.*, radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  53.97 from 54.64 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 an object that has come within ten LD since A/CC began these traffic reports (2007) but is not presently 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 7 April '18

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, three were "one nighters." So far The Tracking News has counted a total of fifteen 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 7 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.


MPEC 2018-G28 - "21:19 UT" - 2018 GG


<< DOU on 7 Apr. '18 >>  MPEC 2018-G27 - "12:01 UT" - Daily Orbit Update

Observers  on 7 April '18

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 7 in MPEC 2018-G27 -- 2018 DX3, 2018 BY2, 85953, 475967, 172034, 152931, 1866
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPEC 2018-G27 -- 2018 FW3, 2018 FP4, 2018 FC2, 2018 FA3, 2018 EL4, 2018 DW3, 2017 UK2, 515767
T08ATLAS Mauna Loa in Hawaii, 3 in MPEC 2018-G27 -- 515049, 475967, 1866
K46Bamberg Obs. in Germany, 1 in MPEC 2018-G27 -- 1627
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2018-G27 & 2018-G28 -- 2018 GG, 2015 XE352, 85953, 36284, 9856, 6053
107Cavezzo Obs. in Italy, 1 in MPEC 2018-G27 -- 2018 BY2
K65Cesena Obs. in Italy, 1 in MPEC 2018-G28 -- 2018 GG
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2018-G28 -- 2018 GG
113Drebach Obs. in Germany, 1 in MPEC 2018-G28 -- 2018 GG
151Eschenberg Obs. in Switzerland, 3 in MPECs 2018-G27 & 2018-G28 -- 2018 GG, 2018 DX3, 2012 DG61
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-G28 -- 2018 GG
J95Great Shefford Obs. in England, 1 in MPEC 2018-G28 -- 2018 GG
A17Guidestar Obs. in Germany, 6 in MPECs 2018-G27 & 2018-G28 -- 2018 GG, 2018 FQ5, 2018 FL3, 2018 EQ4, 2018 EE, 2017 XH62
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2018-G28 -- 2018 GG
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-G27 -- 2018 FQ5
246KLENOT in the Czech Republic, 16 in MPECs 2018-G27 & 2018-G28 -- 2018 GG, 2018 FY1, 2018 FS3, 2018 FQ5, 2018 FL3, 2018 FJ29, 2018 EJ4, 2018 EE, 2018 EB, 2018 DX3, 2018 DB2, 2018 BY2, 2015 XE352, 2015 RA83, 2015 DP155, 2008 GB110
K38M57 Obs. in Italy, 1 in MPEC 2018-G28 -- 2018 GG
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2018-G27 -- 2015 RL82, 434344, 416801, 27346, 152889
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-G28 -- 2018 GG
G34Oberfrauendorf Obs. in Germany, 4 in MPEC 2018-G27 -- 2018 EB, 2018 DX3, 85953, 450894
K61Rokycany Obs. in the Czech Republic, 8 in MPECs 2018-G27 & 2018-G28 -- 2018 GG, 2018 FQ5, 2018 FL3, 2018 EE, 2018 DB2, 2018 CE2, 2018 BY2, 2017 WH14
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-G28 -- 2018 GG
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-G27 -- 2018 EA4
G402program code 2 via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-G27 -- 2018 BY2
587Sormano Obs. in Italy, 1 in MPEC 2018-G28 -- 2018 GG
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-G27 -- 2014 YJ14
I52Steward Obs. Mt. Lemmon Station in Arizona, 7 in MPECs 2018-G27 & 2018-G28 -- 2018 GG, 2018 GC, 2018 FJ5, 2018 BH6, 2017 VL15, 2015 TX143, 2015 KR157
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-G27 -- 2018 FQ4
L01Visnjan Obs., 1 in MPEC 2018-G28 -- 2018 GG
198Wildberg Obs. in Germany, 1 in MPEC 2018-G28 -- 2018 GG
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 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 GGJPL Sentry22362086-209551.34837e-05-4.71-4.980JPL: Computed at 15:28 today Pacific time based on 73 observations spanning 1.5081 days (2018-Apr-06.30127 to 2018-Apr-07.80936). Diameter approximately 0.042 km. from weighted mean H=24.52.
2018 GCNEODyS1733209811.55e-09-6.77-6.770NEODyS #2 for the day: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2018-04-04.162 to 2018-04-07.176."
2018 FJ5NEODyS1733208412.73e-07-3.75-3.750NEODyS: "Based on 61 optical observations (of which 1 are rejected as outliers) from 2018-03-24.431 to 2018-04-07.148."
JPL Sentry16002084-208412.726e-08-4.78-4.780JPL: Computed at 07:29 today Pacific time based on 64 observations spanning 13.717 days (2018-Mar-24.43016 to 2018-Apr-07.14739). Diameter approximately 0.350 km. from weighted mean H=19.90.
2018 FQ4NEODyS1733R E M O V E D-
2018 FC2NEODyS17332092-209921.09e-08-8.04-8.090NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2018-03-18.581 to 2018-04-05.365."
JPL Sentry16002099-209912.254e-10-9.73-9.730JPL: Computed at 07:28 today Pacific time based on 37 observations spanning 17.784 days (2018-Mar-18.58001 to 2018-Apr-05.363839). Diameter approximately 0.038 km. from weighted mean H=24.76.
2018 EL4NEODyS17332102-211038.58e-07-6.58-6.830NEODyS: "Based on 72 optical observations (of which 0 are rejected as outliers) from 2018-03-14.211 to 2018-04-05.325."
JPL Sentry16002110-211022.3077e-07-7.19-7.350JPL: Computed at 07:35 today Pacific time based on 77 observations spanning 22.115 days (2018-Mar-14.20994 to 2018-Apr-05.32462). Diameter approximately 0.031 km. from weighted mean H=25.21.

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 7 April '18

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

2236Noted that JPL Sentry has posted 2018 GG as an impact risk - see above
2211Grabbed MPEC 2018-G28 - 2018 GG - see above
1748Generated Traffic Report
1733Noted that NEODyS has updated its 2018 EL4 risk assessment - see above
Noted that NEODyS has updated its 2018 FC2 risk assessment - see above
Noted that NEODyS has updated its 2018 FJ5 risk assessment - see above
Noted that NEODyS has removed 2018 FQ4 as an impact risk - see above
Noted that NEODyS has updated its 2018 GC risk assessment - see above
1600Noted that JPL Sentry has updated its 2018 EL4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 FC2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 FJ5 risk assessment - see above
Noted that NEODyS has posted 2018 GC as an impact risk - see above
Grabbed MPEC 2018-G27 - Daily Orbit Update - see above