Contents  on 27 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 27 March '18

Nine objects reported inside ten LD

There are nine small Solar-System bodies reported within ten lunar distances (LD) of our planet today. Nearest are 2018 FQ1, which is heading out from 5.83 to 6.31 LD, and 2018 FB, inbound from 7.37 to 6.07 LD. Much further away, large radar target 2018 DH1 gets its closest to Earth on this passage, coming to 9.17 LD at 1017 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
1.60 LD March 21 2018 ED9 13 m  7.01 to 8.33 LD March 14 - 29 NHATS target
3.17 LD March 22 2018 FR3 12 m  8.84 to 10.46 LD March 16 - 27 NHATS target, exits ten LD
4.88 LD March 29 2018 FB 53 m  6.07 from 7.37 LD March 25 - April 3 DOU
5.63 LD March 25 2018 FQ1 14 m  5.83 to 6.31 LD March 19 - April 1 NHATS target
6.15 LD yesterday 2018 FR1 16 m  6.58 to 7.96 LD March 23 - 29
6.22 LD April 1 2018 EM4 30 m  8.54 from 9.54 LD yesterday - April 6 NHATS target
7.69 LD tomorrow 2018 FO4 11 m  7.79 from 8.12 LD March 24 - April 2 NHATS target
9.17 LD today 2018 DH1 214 m  9.17 LD yesterday - tomorrow radar target, Earth closest at 1017 UTC - DOU
9.20 LD March 24 2018 FW1 33 m  9.90 to 10.63 LD March 22 - 27 exits ten LD

This report was generated at 1740 UTC with first follow-up in today's DOU MPEC for approaching 2018 FW4 and departed objects 2018 FX4 and risk-listed 2018 EE9, along additional observation of departed 2018 FF3 and continuing follow-up for approaching 2018 EJ4, inbound 2018 FB, passing 2018 DH1, and departed objects 2018 FN3, 2018 FH1, and 2018 FW.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
4.0   LD April 2* 2004 FG29 21 m  19.1 from 22.4 LD March 30 - April 5 EPU +/- 1.03 hours*
9.71 LD April 5 2018 FW4 31 m  23.42 from 25.87 LD April 4 - 6 DOU
9.24 LD April 14 2014 UR 16 m  19.29 from 20.12 LD April 10 - 18 NHATS target
6.2   LD May 8* 2016 JQ5 8 m  110.0 from 113.2 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  50.35 from 51.56 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  96.05 from 98.76 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  238.31 from 243.71 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 184 m  97.9 from 99.3 LD June 4 - 16 EPU +/- 1.60 hours*, radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  61.70 from 62.46 LD June 6 - 15 NHATS target
* EPU = Earth passage uncertainty


<< Reading:  NASA/Goddard has a news item about "what interstellar visitor [1I/`Oumuamua (A/2017 U1)] can teach us," in regard to a science paper on that subject. See links to more info here.



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 27 March '18

The MPC's NEO Confirmation Page has 24 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 24 objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 26 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 27 March '18

Minor Planet Electronic Circulars

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


<< DOU on 27 Mar. '18 >>  MPEC 2018-F134 - "12:03 UT" - Daily Orbit Update

Observers  on 27 March '18

A total of 21 observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPEC 2018-F134 -- 2018 FN3, 2018 FF3, 2018 EG, 2018 BB7
T08ATLAS Mauna Loa in Hawaii, 3 in MPEC 2018-F134 -- 152952, 138847, 1036
069Baldone Obs. in Latvia, 1 in MPEC 2018-F134 -- 164121
160Castelmartini Obs. in Italy, 7 in MPEC 2018-F134 -- 85628, 40267, 350988, 25916, 194126, 14402, 7889
703Catalina Sky Survey in Arizona, 1 in MPEC 2018-F134 -- 2009 SK104
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 21 in MPEC 2018-F134 -- 2018 FZ1, 2018 FY1, 2018 FX4, 2018 FX1, 2018 FW4, 2018 FW, 2018 FU4, 2018 FP4, 2018 FN4, 2018 FN3, 2018 FM4, 2018 FL3, 2018 FK2, 2018 FF2, 2018 FD1, 2018 FC2, 2018 ER2, 2018 ER1, 2018 EE9, 2018 DY1, 2018 BP5
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-F134 -- 2018 FH1
246KLENOT in the Czech Republic, 1 in MPEC 2018-F134 -- 2018 FE4
932McCarthy Obs. in Connecticut, 1 in MPEC 2018-F134 -- 2018 FB
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2018-F134 -- 2018 FN3
Z80Northolt Branch Obs. in England, 2 in MPEC 2018-F134 -- 2018 DX3, 2018 DH1
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2018-F134 -- 36183, 143527
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2018-F134 -- 2012 DG61
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-F134 -- 2018 DJ4
Y00SONEAR in Brazil, 1 in MPEC 2018-F134 -- 1981
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2018-F134 -- 2018 FL4, 2018 FJ4, 2018 FE4, 2015 FP118, 2004 FJ29
I52Steward Obs. Mt. Lemmon Station in Arizona, 16 in MPEC 2018-F134 -- 2018 FY, 2018 FX3, 2018 FW3, 2018 FV3, 2018 FU4, 2018 FU3, 2018 FU1, 2018 FN3, 2018 FL4, 2018 FL3, 2018 FF1, 2018 FE4, 2018 FE2, 2018 FB1, 2018 EQ4, 2018 EJ4
Z52The Studios Obs., 1 in MPEC 2018-F134 -- 163243
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-F134 -- 2010 PU66
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2018-F134 -- 2018 EC9
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2018-F134 -- 2018 FB, 2018 EE, 497117
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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 FL4NEODyS1631R E M O V E D-
2018 FE4JPL Sentry15422085-210786.792327e-07-6.06-6.680JPL: Computed at 07:36 today Pacific time based on 24 observations spanning 6.9216 days (2018-Mar-20.4591 to 2018-Mar-27.38074). Diameter approximately 0.035 km. from weighted mean H=24.93.
2018 FC2JPL Sentry15422099-209919.757e-08-7.10-7.100JPL: Computed at 07:33 today Pacific time based on 28 observations spanning 7.8035 days (2018-Mar-18.58001 to 2018-Mar-26.38354). Diameter approximately 0.037 km. from weighted mean H=24.78.
2018 FU1JPL Sentry15422059-2117211.65623968e-05-6.05-6.430JPL: Computed at 07:44 today Pacific time based on 25 observations spanning 8.9656 days (2018-Mar-18.47342 to 2018-Mar-27.43906). Diameter approximately 0.014 km. from weighted mean H=26.89.
2018 EE9JPL Sentry15422081-2118211.5853806e-05-5.55-5.930JPL: Computed at 07:35 today Pacific time based on 13 observations spanning 13.648 days (2018-Mar-12.66591 to 2018-Mar-26.31435). Diameter approximately 0.018 km. from weighted mean H=26.39.

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 27 March '18

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

1740Generated Traffic Report
1631Noted that NEODyS has removed 2018 FL4 as an impact risk - see above
1542Noted that JPL Sentry has updated its 2018 EE9 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 FE4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 FU1 risk assessment - see above
Grabbed MPEC 2018-F134 - Daily Orbit Update - see above