Contents  on 25 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 25 March '18

Thirteen objects reported inside ten LD

There are thirteen minor planets reported within ten lunar distances (LD) of our home world today. Nearest are intruder 2018 FZ3, outbound from 4.19 to 7.32 LD, and 2018 ED9, moving out from 4.42 to 5.70 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
0.38 LD March 18 2018 FE3 13 m  9.14 to 10.49 LD March 10 - 25 intruder, NHATS target, exits ten LD, risk
0.50 LD March 23 2018 FZ3 10 m  4.19 to 7.32 LD March 20 - 26 intruder
1.13 LD March 23 2018 FF3 16 m  5.17 to 7.81 LD March 19 - 26 DOU
1.60 LD March 21 2018 ED9 13 m  4.42 to 5.70 LD March 14 - 29 NHATS target
3.17 LD March 22 2018 FR3 12 m  5.76 to 7.26 LD March 16 - 27 NHATS target
4.45 LD March 21 2018 FG1 12 m  9.38 to 11.34 LD March 17 - 25 exits ten LD, risk
4.88 LD March 29 2018 FB 58 m  8.89 from 10.53 LD today - April 3 enters ten LD - DOU
5.24 LD March 23 2018 FC3 11 m  6.68 to 9.21 LD March 21 - 26
5.63 LD today 2018 FQ1 14 m  5.63 LD March 19 - April 1 NHATS target, Earth closest at 2046 UTC
6.15 LD tomorrow 2018 FR1 16 m  6.17 from 6.92 LD March 23 - 29
7.69 LD March 28 2018 FO4 11 m  8.67 from 9.41 LD yesterday - April 2 NHATS target
9.20 LD yesterday 2018 FW1 33 m  9.21 to 9.42 LD March 22 - 27 DOU
9.27 LD today 2018 FB3 31 m  9.27 LD yesterday - tomorrow Earth closest at 0117 UTC

This report was generated at 2008 UTC with first recovery follow-up for approaching 388945 2008 TZ3 and additional observation of outbound 2018 FF3 in today's DOU MPEC, along with continuing follow-up for approaching objects 2018 EJ4 and 2018 DH1, inbound 2018 FB, outbound 2018 FW1, and departed objects 2018 FN3, 2018 FW, and risk-listed 2018 DT.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.17 LD March 27 2018 DH1 214 m  10.27 from 12.09 LD tomorrow - March 28 radar target - DOU
6.22 LD April 1 2018 EM4 30 m  10.62 from 11.77 LD tomorrow - April 6 NHATS target
4.0   LD April 2* 2004 FG29 21 m  25.8 from 29.1 LD March 30 - April 5 EPU +/- 1.03 hours*
9.7   LD April 5* 2018 FW4 31 m  28.4 from 31.0 LD April 4 - 6 EPU +/- 21 mins.*
9.24 LD April 14 2014 UR 16 m  20.95 from 21.79 LD April 10 - 18 NHATS target
6.2   LD May 8* 2016 JQ5 8 m  116.5 from 119.9 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  52.77 from 54.00 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  101.49 from 104.26 LD May 5 - 13 DOU
9.50 LD May 29 68347 2001 KB67 371 m  249.14 from 254.62 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 182 m  100.7 from 102.1 LD June 4 - 16 EPU +/- 2.17 hours*, radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  63.24 from 64.03 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 25 March '18

The MPC's NEO Confirmation Page has 26 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 26 objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 29 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 25 March '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.


<< DOU on 25 Mar. '18 >>  MPEC 2018-F129 - "12:03 UT" - Daily Orbit Update


MPEC 2018-F128 - "11:24 UT" - 2017 OU18

Observers  on 25 March '18

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2018-F129 -- 2018 FN3, 2018 FF3, 2018 EC9, 2018 DT, 2018 DK1, 2018 BB7, 2017 XV2, 2017 AV3, 2014 VU1, 2011 EB7
069Baldone Obs. in Latvia, 1 in MPEC 2018-F129 -- 164121
160Castelmartini Obs. in Italy, 3 in MPEC 2018-F129 -- 2018 FB, 333888, 6053
107Cavezzo Obs. in Italy, 3 in MPEC 2018-F129 -- 2018 DH1, 276033, 3752
113Drebach Obs. in Germany, 7 in MPEC 2018-F129 -- 2018 FY1, 2018 FW1, 2018 FU, 2018 FF2, 2018 FB, 2018 DX3, 2015 XE352
151Eschenberg Obs. in Switzerland, 3 in MPEC 2018-F129 -- 2018 FB, 2015 XE352, 2001 FA58
511Haute Provence Obs. in Germany, 1 in MPEC 2018-F129 -- 2018 FE2
Z43Landehen Obs., 5 in MPEC 2018-F129 -- 2018 DX3, 2018 DH1, 172034, 152931, 9856
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-F129 -- 9856
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2018-F129 -- 2018 FW, 2018 CG2, 2005 GL, 137062, 1580
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-F129 -- 2018 DH1
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-F128 -- 2017 OU18
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-F129 -- 2018 BY2
204Schiaparelli Obs. in Italy, 2 in MPEC 2018-F129 -- 2018 FU, 2018 DB2
Q11Shinshiro Obs., 1 in MPEC 2018-F129 -- 9856
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-F129 -- 2015 RA83
W884G. Gasparovic in Croatia via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-F129 -- 3552
Q21Southern Utsunomiya in Japan, 1 in MPEC 2018-F129 -- 2018 DH1
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2018-F129 -- 2018 EJ4, 2017 BD29, 2009 SK2
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2018-F129 -- 388945
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2018-F129 -- 2018 FD
A16Tentlingen Obs. in Switzerland, 2 in MPEC 2018-F129 -- 2018 FB, 6053
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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 FQ4NEODyS17002035-21161191.33e-05-5.90-6.550NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2018-03-22.341 to 2018-03-23.594."
2018 FL4NEODyS1700209212.45e-11-10.17-10.170NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2018-03-19.468 to 2018-03-23.007."
2018 FE4NEODyS17002033-21181312.92e-06-5.46-5.87n/aNEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2018-03-20.460 to 2018-03-22.984."
2018 FE3NEODyS17002103-211827.23e-05-5.64-5.64n/aNEODyS: "Based on 55 optical observations (of which 3 are rejected as outliers) from 2018-03-21.272 to 2018-03-23.261."
2018 FC2NEODyS1700209911.66e-06-5.88-5.880NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2018-03-18.581 to 2018-03-24.493."
2018 FU1NEODyS17002055-2117741.09e-04-5.23-5.340NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2018-03-18.474 to 2018-03-22.394."
2018 EL4NEODyS17002101-211025.61e-08-7.75-7.80NEODyS: "Based on 61 optical observations (of which 0 are rejected as outliers) from 2018-03-14.211 to 2018-03-23.203."
2006 XZ2NEODyS1700R 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 25 March '18

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

2008Generated Traffic Report
1700Noted that NEODyS has removed 2006 XZ2 as an impact risk - see above
Noted 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 FE3 risk assessment - see above
Noted that NEODyS has posted 2018 FE4 as an impact risk - see above
Noted that NEODyS has posted 2018 FL4 as an impact risk - see above
Noted that NEODyS has posted 2018 FQ4 as an impact risk - see above
Noted that NEODyS has updated its 2018 FU1 risk assessment - see above
Grabbed MPEC 2018-F128 - 2017 OU18 - see above
Grabbed MPEC 2018-F129 - Daily Orbit Update - see above