Contents  on 19 March '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 19 March '18

Four objects reported inside ten LD

Bulletin - 2359 UTC:  Two new discoveries of close passers have been announced.

Earth passageI D~Size~Inside ten LDNotes
~3.4 LD ~March 152018 FH115 m March 6 - 24MPEC
4.45 LD at 0445 tomorrow2018 FG113 m March 16 - 26MPEC



Four asteroids are reported inside ten lunar distances (LD) of our home world today. Nearest are 2018 FE, outbound from 4.10 to 5.52 LD, and 2018 ET1, moving away from 4.48 to 4.95 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
1.45 LD March 16 2018 EB4 28 m  8.11 to 10.98 LD March 12 - 19 exits ten LD, risk
3.93 LD yesterday 2018 FE 8 m  4.10 to 5.52 LD March 15 - 21
4.38 LD yesterday 2018 ET1 18 m  4.48 to 4.96 LD March 11 - 24 NHATS target - DOU
7.73 LD March 22 2018 EV1 28 m  9.83 from 11.55 LD today - March 24 enters ten LD

This report was updated at 1820 UTC with first follow-up for approaching 2018 EJ4 and additional observation of approaching 2018 FB in today's DOU MPEC along with continuing follow-up for approaching objects 2018 DH1 and 1999 FN19, outbound 2018 ET1, and departed objects 2018 ET3, 2018 EW1, and 2018 DT.
        Your first local asteroid traffic report was generated at 0422 UTC with the addition of six returning objects, all in the traffic table below, that have a close approach in the next three months preceding or overlapping with recently discovered 2018 EJ4. Two of these have already been recovered. Radar target 1999 FN19 (MPEC) was recovered on February 14th and most recently observed yesterday, and 2015 DP155 (DOU) was recovered on January 14th and last observed on March 12th.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
4.9   LD March 29* 2018 FB 62 m  19.5 from 21.4 LD March 25 - April 3 EPU +/- 1.63 hours* - DOU
9.17 LD March 27 2018 DH1 214 m  25.90 from 29.01 LD March 26 - 28 DOU
6.2   LD April 1* 2018 EM4 27 m  18.0 from 19.3 LD March 26 - April 6 EPU +/- 5 mins.*, NHATS target
4.0   LD April 2* 2004 FG29 21 m  46.1 from 49.6 LD March 30 - April 5 EPU +/- 1.03 hours*
9.24 LD April 14 2014 UR 16 m  25.94 from 26.76 LD April 10 - 18 NEW, NHATS target
6.2   LD May 8* 2016 JQ5 8 m  137.2 from 140.8 LD May 4 - 11 NEW, EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  60.36 from 61.69 LD May 5 - 9 NEW, radar/NHATS target - DOU
6.48 LD May 9 388945 2008 TZ3 282 m  118.60 from 121.57 LD May 5 - 13 NEW
9.50 LD May 29 68347 2001 KB67 371 m  282.38 from 287.98 LD May 28 - 30 NEW, radar target
5.5   LD June 10* 2018 EJ4 178 m  109.3 from 110.8 LD June 4 - 16 EPU +/- 9.77 hours*, NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  68.28 from 69.19 LD June 6 - 15 NEW, NHATS target
* EPU = Earth passage uncertainty


<< Reading:  A report has been posted (abstract, illustrated PDF) about a bolide widely observed last October 4th over the Shangri-La region of Yunnan Provice in China. At an "impact energy of ... approximately 0.54 kt TNT" as measured by U.S. sensors, it is described as the largest observed event over land since a bolide above Mauritania on June 27th of 2016 at 1.2 kt. No resulting meteorites have been reported found yet.



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.

Radar Astrometry  on 19 March '18

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2037 UTC when the database was dated 19 March

NEOCP Activity  on 19 March '18

The MPC's NEO Confirmation Page has 83 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 83 objects listed. Of these, 49 were "one nighters." So far The Tracking News has counted a total of 99 listings on the NEOCP today.

New MPECs  on 19 March '18

Minor Planet Electronic Circulars

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


MPEC 2018-F45 - "23:31 UT" - 2018 FH1


MPEC 2018-F44 - "23:26 UT" - 2018 FG1


MPEC 2018-F43 - "23:14 UT" - 2018 FF1


MPEC 2018-F42 - "21:13 UT" - Comet C/2018 F1 (Grauer)


MPEC 2018-F41 - "14:52 UT" - 2018 FD1


MPEC 2018-F40 - "14:46 UT" - 2018 FC1


MPEC 2018-F39 - "14:41 UT" - 2018 FB1


MPEC 2018-F38 - "14:35 UT" - 2018 FA1


<< DOU on 19 Mar. '18 >>  MPEC 2018-F37 - "12:03 UT" - Daily Orbit Update

Observers  on 19 March '18

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-F40 -- 2018 FC1
251Arecibo in Puerto Rico, 1 in radar -- 3200
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2018-F37 & 2018-F39 -- 2018 FB1, 2018 DZ1, 2018 DR1, 2018 CA, 2017 WX12, 331509
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2018-F45 -- 2018 FH1
Q68Blue Mountains Obs. in New South Wales, 2 in MPEC 2018-F37 -- 163243, 1627
U63Burnt Tree Hill Obs., 1 in MPEC 2018-F37 -- 2018 FB
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2018-F42 -- C/2018 F1
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2018-F37, 2018-F38 & 2018-F40 -- 2018 FC1, 2018 FA1, 2015 RL82, 6455, 3752, 1864
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPECs 2018-F37, 2018-F38, 2018-F39, 2018-F40, 2018-F41 & 2018-F43 -- 2018 FF1, 2018 FD1, 2018 FD, 2018 FC1, 2018 FB1, 2018 FA1, 2018 EY, 2018 EX, 2018 ER1, 2018 AP12, 2017 YF5
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-F42 -- C/2018 F1
113Drebach Obs. in Germany, 1 in MPEC 2018-F45 -- 2018 FH1
734Farpoint Obs. in Kansas, 3 in MPECs 2018-F39, 2018-F40 & 2018-F43 -- 2018 FF1, 2018 FC1, 2018 FB1
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-F45 -- 2018 FH1
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 3200
J95Great Shefford Obs. in England, 2 in MPECs 2018-F44 & 2018-F45 -- 2018 FH1, 2018 FG1
238Grorudalen Obs. in Norway, 2 in MPEC 2018-F37 -- 3752, 1981
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-F40 -- 2018 FC1
Q66JAXA Janess-G in New South Wales, 1 in MPEC 2018-F45 -- 2018 FH1
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2018-F37 -- 2018 FU
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2018-F43 -- 2018 FF1
474Mt. John Obs. in New Zealand, 9 in MPECs 2018-F37, 2018-F40 & 2018-F41 -- 2018 FD1, 2018 FC1, 2018 EZ3, 2018 EC1, 2018 EB, 2018 DT1, 2018 DA2, 2018 CP3, 2015 FF120
G96Mt. Lemmon Survey (MLS) in Arizona, 15 in MPECs 2018-F37, 2018-F38, 2018-F39, 2018-F42 & 2018-F44 -- 2018 FG1, 2018 FB1, 2018 FA1, C/2018 F1, 2018 EE4, 2018 DY1, 2018 DX3, 2018 AO18, 2014 RX30, 2013 GZ7, 1999 FN19, 53435, 172034, 8709, 3102
566NEAT's GEODSS Haleakala telescope in Hawaii, 2 in MPEC 2018-F37 -- 8201, 7753
644NEAT's Mt. Palomar telescope in southern California, 2 in MPEC 2018-F37 -- 8201, 1036
608NEAT's USAF Haleakala telescope in Hawaii, 4 in MPEC 2018-F37 -- 137199, 9856, 8201, 1036
F51Pan-STARRS 1 (PS1) in Hawaii, 37 in MPECs 2018-F37, 2018-F41, 2018-F42 & 2018-F43 -- 2018 FF1, 2018 FD1, 2018 FD, C/2018 F1, 2018 EW1, 2018 EH4, 2018 DK3, 2017 VH2, 2012 QP17, 2011 FG, 2010 TM3, 2009 HD21, 2007 TW68, 513776, 496962, 474574, 467527, 456898, 444185, 41429, 411611, 390522, 322763, 277810, 208617, 186822, 183548, 172722, 163692, 163679, 162011, 152941, 141531, 12923, 10145, 8709, 719
B49Paus Obs. in Spain, 2 in MPECs 2018-F37 & 2018-F42 -- C/2018 F1, 2015 XE352
033Schwarzschild Obs. in Germany, 3 in MPECs 2018-F38, 2018-F39 & 2018-F40 -- 2018 FC1, 2018 FB1, 2018 FA1
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-F42 -- C/2018 F1
691Spacewatch 0.9m telescope in Arizona, 8 in MPEC 2018-F37 -- 2018 EZ, 2018 EW1, 2018 EM2, 2018 EL4, 2018 DT1, 2018 BY2, 322763, 162882
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2018-F37 -- 2018 ET3, 2018 EL2, 2018 EF, 2018 DZ1, 2018 DX1, 2018 DT, 2018 DR1
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2018-F37 -- 2018 DH1
I52Steward Obs. Mt. Lemmon Station in Arizona, 29 in MPECs 2018-F37, 2018-F38, 2018-F39, 2018-F40, 2018-F41, 2018-F42 & 2018-F44 -- 2018 FG1, 2018 FD1, 2018 FC1, 2018 FB1, 2018 FA1, C/2018 F1, 2018 EZ, 2018 EW1, 2018 EU3, 2018 ET1, 2018 ES2, 2018 EO4, 2018 EL4, 2018 EK4, 2018 EJ4, 2018 EH4, 2018 EE4, 2018 EE, 2018 EC1, 2018 EA4, 2018 DJ4, 2018 DF2, 2018 CK14, 2018 CG2, 2018 CB15, 2018 BO3, 2017 UA1, 2017 SE19, 2011 BM24
T09UH/Tholen NEO Follow-Up Subaru Telescope in Hawaii, 1 in MPEC 2018-F37 -- 2012 XA133
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 March '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 EL4JPL Sentry16052076-211046.6308e-09-8.53-8.940JPL: Computed at 08:25 today Pacific time based on 39 observations spanning 3.9309 days (2018-Mar-14.20994 to 2018-Mar-18.14082). Diameter approximately 0.034 km. from weighted mean H=24.99.

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 19 March '18

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

2358Grabbed MPEC 2018-F44 - 2018 FG1 - see above
Grabbed MPEC 2018-F45 - 2018 FH1 - see above
2325Grabbed MPEC 2018-F43 - 2018 FF1 - see above
2209Grabbed MPEC 2018-F42 - Comet C/2018 F1 (Grauer) - see above
2037Noted Radar Astrometry database update - see above
1820Updated Traffic Report
1605Noted that JPL Sentry has updated its 2018 EL4 risk assessment - see above
Grabbed MPEC 2018-F37 - Daily Orbit Update - see above
Grabbed MPEC 2018-F38 - 2018 FA1 - see above
Grabbed MPEC 2018-F39 - 2018 FB1 - see above
Grabbed MPEC 2018-F40 - 2018 FC1 - see above
Grabbed MPEC 2018-F41 - 2018 FD1 - see above