Contents  on 9 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 9 April '18

Three objects reported inside ten LD

Three visitors are reported to be within ten lunar distances (LD) of Earth today. Within our planet's sphere of gravitational influence, newly announced 2018 GN comes its closest to us this time around, reaching 1.12 LD at 1455 UTC, and passing the Moon at 1.68 LD at 1648 UTC.

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
1.12 LD today 2018 GN 19 m  1.12 LD April 7 - 11 NEW, Earth closest at 1455 UTC, Moon
closest 1.68 LD at 1648 UTC - MPEC
4.06 LD April 3 2018 GE 11 m  4.68 to 4.91 LD March 13 - April 24 NHATS target, risk - DOU
4.69 LD April 11 2018 GG 42 m  7.60 from 10.24 LD today - April 14 enters ten LD, risk

This report was generated at 1742 UTC with the discovery of 2018 GN (MPEC) and with follow-up in today's DOU MPEC for approaching objects 2018 EJ4 and 1999 FN19 and for outbound risk-listed 2018 GE.

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  10.19 from 10.64 LD tomorrow - April 18 NHATS target
6.2   LD May 8* 2016 JQ5 8 m  70.8 from 73.6 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  35.28 from 36.42 LD May 5 - 9 radar/NHATS target - DOU
6.48 LD May 9 388945 2008 TZ3 282 m  63.43 from 65.78 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  173.05 from 177.70 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 184 m  80.8 from 82.0 LD June 4 - 16 EPU +/- 17 mins.*, radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  52.64 from 53.30 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 9 April '18

The MPC's NEO Confirmation Page has 29 listings

When last checked at 2323 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 29 objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 30 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 9 April '18

Minor Planet Electronic Circulars

As of last check at 2323 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 9 Apr. '18 >>  MPEC 2018-G37 - "12:01 UT" - Daily Orbit Update


MPEC 2018-G36 - "10:25 UT" - 2016 QD


MPEC 2018-G35 - "03:23 UT" - 2018 GN

Observers  on 9 April '18

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-G35 -- 2018 GN
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2018-G37 -- 2018 FH2, 2018 DK1, 2018 CU1, 2017 UR7, 2013 LK25, 2005 BG14, 2001 TZ1, 515767, 515335
703Catalina Sky Survey (CSS) in Arizona, 26 in MPECs 2018-G35 & 2018-G37 -- 2018 GN, 2018 FY1, 2018 FS3, 2018 FB1, 2018 DX3, 2018 BY2, 2014 FD7, 2009 SK104, 2005 FN4, 66251, 513497, 436116, 350462, 337084, 333888, 276770, 248926, 214869, 172034, 154656, 152679, 136874, 12711, 4947, 1627, 1036
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPECs 2018-G36 & 2018-G37 -- 2018 FN4, 2018 FJ29, 2018 EX, 2018 ES2, 2018 DT1, 2018 BK3, 2018 BH6, 2018 AF4, 2017 UH44, 2017 SG14, 2016 QD
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-G35 -- 2018 GN
113Drebach Obs. in Germany, 1 in MPEC 2018-G35 -- 2018 GN
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-G35 -- 2018 GN
A17Guidestar Obs. in Germany, 6 in MPECs 2018-G35 & 2018-G37 -- 2018 GN, 2018 FS3, 2018 FL3, 2018 FK29, 2018 DX3, 2014 FD7
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2018-G35 -- 2018 GN
H06#M. Suzuki in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-G35 -- 2018 GN
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 5 in MPECs 2018-G35 & 2018-G37 -- 2018 GN, 2018 DX3, 2018 BY2, 194126, 1627
246KLENOT in the Czech Republic, 19 in MPECs 2018-G35 & 2018-G37 -- 2018 GN, 2018 FY1, 2018 FS3, 2018 FQ5, 2018 FL3, 2018 FB1, 2018 EJ4, 2018 EE, 2018 EB, 2018 DB2, 2018 CE2, 2018 BY2, 2018 AO18, 2015 XE352, 2015 RL82, 2015 RA83, 2009 SK104, 2005 FN4, 1999 FN19
108Montelupo Obs. in Italy, 4 in MPEC 2018-G37 -- 2018 DX3, 85953, 194126, 172034
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPEC 2018-G37 -- 2018 FO3, 2018 FL3, 2018 FC1, 2018 DA1, 2015 RA83, 2015 DE198, 2010 PY22, 393908, 265196, 1864
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-G35 -- 2018 GN
G34Oberfrauendorf Obs. in Germany, 2 in MPECs 2018-G35 & 2018-G37 -- 2018 GN, 2018 BY2
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2018-G37 -- 194126, 8709
L04ROASTERR-1 in Romania, 1 in MPEC 2018-G35 -- 2018 GN
K61Rokycany Obs. in the Czech Republic, 3 in MPECs 2018-G35 & 2018-G37 -- 2018 GN, 2018 GL, 2018 FJ29
Y00SONEAR in Brazil, 1 in MPEC 2018-G37 -- 2009 SK104
691Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2018-G37 -- 2018 FV3, 2018 FS3, 2018 EQ4, 2017 SV20, 2016 CX264, 2013 EM20, 2011 HJ7, 2010 GD35, 2009 JL1
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2018-G37 -- 2018 FK4, 2018 EC9, 2014 NE3
I52Steward Obs. Mt. Lemmon Station in Arizona, 15 in MPEC 2018-G37 -- 2018 GL, 2018 GE, 2018 FY1, 2018 FS1, 2018 FK29, 2018 FH, 2018 EZ, 2018 ER4, 2018 EJ4, 2018 EB, 2017 WE2, 2017 VO15, 2017 UD1, 2016 GH135, 2016 BO1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-G37 -- 2016 AH8
L01Visnjan Obs., 1 in MPEC 2018-G35 -- 2018 GN
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 April '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2323 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 GENEODyS1600208313.66e-09-9.94-9.940NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2018-04-05.426 to 2018-04-09.299."
2014 HG196JPL Sentry18022018-21173329.795112e-07-6.43-7.440JPL: Computed at 21:29 April 8th of 2017 Pacific time based on 18 observations spanning 1.0300 days (2014-Apr-23.08628 to 2014-Apr-24.11626). Diameter approximately 0.016 km. from weighted mean H=26.56.

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 9 April '18

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

1802Noted that JPL Sentry has updated its 2014 HG196 risk assessment - see above
1742Generated Traffic Report
1600Noted that NEODyS has posted 2018 GE as an impact risk - see above
Grabbed MPEC 2018-G36 - 2016 QD - see above
Grabbed MPEC 2018-G37 - Daily Orbit Update - see above
0418Grabbed MPEC 2018-G35 - 2018 GN - see above