Contents  on 31 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 31 March '18

Six objects reported inside ten LD

Six minor objects are known to be inside ten lunar distances (LD) of our planet today. Nearest is risk-listed intruder 2018 FK5, which exits Earth's sphere of gravitational influence, moving from 1.19 to 3.68 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
0.39 LD yesterday 2018 FK5 7 m  1.19 to 3.68 LD March 26 - April 3 intruder, exits Earth SOI, risk
4.0   LD April 2* 2004 FG29 21 m  6.6 from 9.5 LD yesterday - April 5 EPU +/- 1.03 hours*
4.88 LD March 29 2018 FB 52 m  5.31 to 6.30 LD March 25 - April 3 DOU
5.63 LD March 25 2018 FQ1 14 m  8.86 to 9.93 LD March 19 - April 1 NHATS target
6.23 LD April 1 2018 EM4 30 m  6.24 from 6.46 LD March 26 - April 6 NHATS target
7.69 LD March 28 2018 FO4 11 m  8.27 to 8.87 LD March 24 - April 2 NHATS target

This report was generated at 1900 UTC with follow-up in today's DOU MPEC for approaching 388945 2008 TZ3 and outbound 2018 FB, and with radar observation posted yesterday for just departed 2018 DH1. We also note radar observation of 2013 BS45 from February 2013 posted March 28th.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.73 LD April 5 2018 FW4 33 m  14.49 from 16.54 LD April 4 - 5
9.24 LD April 14 2014 UR 16 m  16.05 from 16.85 LD April 10 - 18 NHATS target
6.2   LD May 8* 2016 JQ5 8 m  100.4 from 97.3 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  45.62 from 46.79 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  85.53 from 88.12 LD May 5 - 13 DOU
9.50 LD May 29 68347 2001 KB67 371 m  217.19 from 222.39 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 181 m  92.5 from 93.8 LD June 4 - 16 EPU +/- 1.22 hours*, radar/NHATS target
8.96 LD June 11 2015 DP155 162 m  58.77 from 59.49 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. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 31 March '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, six were "one nighters." So far The Tracking News has counted a total of fourteen 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 31 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 31 Mar. '18 >>  MPEC 2018-F159 - "12:06 UT" - Daily Orbit Update

Observers  on 31 March '18

Seventeen observers appear in today's MPEC.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2018-F159 -- 68348
T05ATLAS Haleakala in Hawaii, 8 in MPEC 2018-F159 -- 40267, 388945, 36284, 194126, 15745, 14402, 6053, 3122
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2018-F159 -- 1685
Q68Blue Mountains Obs. in New South Wales, 1 in MPEC 2018-F159 -- 1627
160Castelmartini Obs. in Italy, 8 in MPEC 2018-F159 -- 85628, 40267, 350988, 25916, 194126, 14402, 7889, 1627
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2018-F159 -- 2018 FA3, 2018 EK4
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-F159 -- 2018 BY2
K38M57 Obs. in Italy, 1 in MPEC 2018-F159 -- 2018 FB
566NEAT's GEODSS Haleakala telescope in Hawaii, 2 in MPEC 2018-F159 -- 437841, 152563
644NEAT's Mt. Palomar telescope in southern California, 2 in MPEC 2018-F159 -- 209215, 140333
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2018-F159 -- 141424
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-F159 -- 2018 FB
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-F159 -- 2017 XA2
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-F159 -- 2012 DG61
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2018-F159 -- 2018 EA4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPEC 2018-F159 -- 2018 FJ5, 2018 FE4, 2018 FC2, 2010 OH126
C51WISE in Earth polar orbit, 2 in MPEC 2018-F159 -- 154268, 6053
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 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 FJ5JPL Sentry16202056-210888.90009e-08-4.21-4.590JPL: Computed at 07:29 today Pacific time based on 36 observations spanning 5.9792 days (2018-Mar-24.43016 to 2018-Mar-30.409394). Diameter approximately 0.370 km. from weighted mean H=19.80.
NEODyS16202056-2118142.23e-07-3.81-4.27n/aNEODyS: "Based on 36 optical observations (of which 1 are rejected as outliers) from 2018-03-24.431 to 2018-03-30.410."
2018 FE4JPL Sentry16202098-210151.45388e-06-5.65-5.940JPL: Computed at 07:31 today Pacific time based on 29 observations spanning 10.126 days (2018-Mar-20.4591 to 2018-Mar-30.585238). Diameter approximately 0.039 km. from weighted mean H=24.72.
NEODyS16202085-2101151.24e-06-5.70-6.160NEODyS: "Based on 30 optical observations (of which 1 are rejected as outliers) from 2018-03-20.460 to 2018-03-30.586."
2018 FC2JPL Sentry16202099-209915.382e-08-7.36-7.360JPL: Computed at 07:27 today Pacific time based on 34 observations spanning 11.933 days (2018-Mar-18.58001 to 2018-Mar-30.512971). Diameter approximately 0.037 km. from weighted mean H=24.78.
NEODyS16202092-209921.06e-06-6.07-6.070NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2018-03-18.581 to 2018-03-30.514."

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 31 March '18

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

1900Generated Traffic Report
1620Noted that JPL Sentry has updated its 2018 FC2 risk assessment - see above
Noted that NEODyS has updated its 2018 FC2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 FE4 risk assessment - see above
Noted that NEODyS has updated its 2018 FE4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 FJ5 risk assessment - see above
Noted that NEODyS has updated its 2018 FJ5 risk assessment - see above
Grabbed MPEC 2018-F159 - Daily Orbit Update - see above