Contents  on 26 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 26 March '18

Thirteen objects reported inside ten LD

Today we have thirteen known transient natural objects less than ten lunar distances (LD) from Earth, but all beyond five LD. Nearest are two outbound objects and one passing. 2018 FQ1 moves away from 5.63 to 5.83 LD and 2018 ED9 from 5.70 to 7.01 LD, while 2018 FR1 comes its closest to our planet this time around -- 6.15 LD at 0341 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
0.50 LD March 23 2018 FZ3 10 m  7.32 to 10.46 LD March 20 - 26 intruder, exits ten LD
1.13 LD March 23 2018 FF3 16 m  7.81 to 10.48 LD March 19 - 26 exits ten LD - DOU
1.60 LD March 21 2018 ED9 13 m  5.70 to 7.01 LD March 14 - 29 NHATS target
3.17 LD March 22 2018 FR3 12 m  7.26 to 8.84 LD March 16 - 27 NHATS target
4.88 LD March 29 2018 FB 54 m  7.37 from 8.89 LD yesterday - April 3 DOU
5.24 LD March 23 2018 FC3 11 m  9.21 to 12.20 LD March 21 - 26 exits ten LD
5.63 LD yesterday 2018 FQ1 14 m  5.63 to 5.83 LD March 19 - April 1 NHATS target
6.15 LD today 2018 FR1 16 m  6.15 LD March 23 - 29 Earth closest at 0341 UTC
6.22 LD April 1 2018 EM4 30 m  9.54 from 10.62 LD today - April 6 NHATS target, enters ten LD
7.69 LD March 28 2018 FO4 11 m  8.12 from 8.67 LD March 24 - April 2 NHATS target
9.17 LD tomorrow 2018 DH1 214 m  9.27 from 10.27 LD today - March 28 radar target, enters ten LD - DOU
9.20 LD March 24 2018 FW1 33 m  9.42 to 9.90 LD March 22 - 27
9.27 LD yesterday 2018 FB3 31 m  9.87 to 11.58 LD March 24 - 26 exits ten LD

This report was generated at 1710 UTC with first follow-up for departed 2018 FM3 in today's DOU MPEC along with continuing follow-up for inbound objects 2018 FB and 2018 DH1, additional observation of outbound 2018 FF3, and astrometry for departed 2018 EF4.

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  22.4 from 25.8 LD March 30 - April 5 EPU +/- 1.03 hours*
9.7   LD April 5* 2018 FW4 31 m  25.9 from 28.4 LD April 4 - 6 EPU +/- 21 mins.*
9.24 LD April 14 2014 UR 16 m  20.12 from 20.95 LD April 10 - 18 NHATS target
6.2   LD May 8* 2016 JQ5 8 m  113.2 from 116.5 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  51.56 from 52.77 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  101.49 from 98.76 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  243.71 from 249.14 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 182 m  100.7 from 99.3 LD June 4 - 16 EPU +/- 2.17 hours*, radar/NHATS target
8.96 LD June 11 2015 DP155 162 m  62.46 from 63.24 LD June 6 - 15 NHATS target
* EPU = Earth passage uncertainty


<< Reading:  CNEOS at NASA/JPL has a news note that "Several news stories circulating over [last] week reporting on the possibility of asteroid [101955 Bennu (1999 RQ36)] impacting the Earth need some correction... [The] earliest possible year in which the asteroid could hit our planet is 2175 [not 2135], and the chance of the impact happening in that year are 1 in 24,000," not "about 1 in 2,700."



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 26 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 26 March '18

Minor Planet Electronic Circulars

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


<< DOU on 26 Mar. '18 >>  MPEC 2018-F133 - "12:03 UT" - Daily Orbit Update


MPEC 2018-F132 - "10:25 UT" - 2018 CR1


MPEC 2018-F131 - "10:24 UT" - 2017 RU15


MPEC 2018-F130 - "10:22 UT" - 2017 MX4

Observers  on 26 March '18

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
K03AAS Montsec Obs., 1 in MPEC 2018-F133 -- 2018 DH1
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2018-F133 -- 2018 FF3, 2018 EL4, 2018 EF4, 2018 CA, 2017 VV13, 2017 SP19
160Castelmartini Obs. in Italy, 7 in MPEC 2018-F133 -- 2018 DX3, 2018 DH1, 2015 XE352, 172034, 12923, 9856, 1627
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 16 in MPEC 2018-F133 -- 2018 FV4, 2018 FT3, 2018 FT1, 2018 FS3, 2018 FP3, 2018 FO3, 2018 FM3, 2018 FC1, 2018 FA4, 2018 EZ3, 2018 DT1, 2018 CZ13, 2018 BK3, 2018 AX, 2017 YF7, 2017 YA6
K83Forti Obs., 1 in MPEC 2018-F133 -- 194126
J95Great Shefford Obs. in England, 1 in MPEC 2018-F133 -- 2018 DH1
246KLENOT in the Czech Republic, 11 in MPEC 2018-F133 -- 2018 FY1, 2018 FU, 2018 FL3, 2018 FF2, 2018 FC1, 2018 FB, 2018 EZ, 2018 EE, 2018 DX3, 2015 XE352, 2001 FA58
168Kourovskaya Obs. in Russia, 1 in MPEC 2018-F133 -- 2018 DH1
K38M57 Obs. in Italy, 1 in MPEC 2018-F133 -- 2018 EE
K74Muensterschwarzach Obs. in Germany, 2 in MPEC 2018-F133 -- 2018 FB, 3752
566NEAT's GEODSS Haleakala telescope in Hawaii, 2 in MPEC 2018-F133 -- 136793, 8566
644NEAT's Mt. Palomar telescope in southern California, 2 in MPEC 2018-F133 -- 68548, 136793
608NEAT's USAF Haleakala telescope in Hawaii, 3 in MPEC 2018-F133 -- 68548, 267940, 136793
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-F133 -- 2018 DH1
J43Oukaimeden Obs. in Morocco, 3 in MPEC 2018-F133 -- 2013 JN22, 31346, 9856
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2018-F130, 2018-F131 & 2018-F132 -- 2018 CR1, 2017 RU15, 2017 MX4
W88!program code "!" (10) via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-F133 -- 2015 PC228
Y00SONEAR in Brazil, 3 in MPEC 2018-F133 -- 68950, 3554, 3552
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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 FQ4JPL Sentry1530R E M O V E DJPL: Risk listing removed at 1441 UTC March 24th
2018 FA4JPL Sentry15302091-209111.591e-07-7.12-7.120JPL: Computed at 07:28 today Pacific time based on 33 observations spanning 7.9006 days (2018-Mar-18.36412 to 2018-Mar-26.26469). Diameter approximately 0.028 km. from weighted mean H=25.43.
2018 EL4JPL Sentry15302110-211017.081e-08-7.66-7.660JPL: Computed at 07:38 today Pacific time based on 63 observations spanning 8.9924 days (2018-Mar-14.20994 to 2018-Mar-23.20237). Diameter approximately 0.032 km. from weighted mean H=25.12.

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 26 March '18

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

1710Generated Traffic Report
1530Noted that JPL Sentry has updated its 2018 EL4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 FA4 risk assessment - see above
Noted that JPL Sentry has removed 2018 FQ4 as an impact risk - see above
Grabbed MPEC 2018-F130 - 2017 MX4 - see above
Grabbed MPEC 2018-F131 - 2017 RU15 - see above
Grabbed MPEC 2018-F132 - 2018 CR1 - see above
Grabbed MPEC 2018-F133 - Daily Orbit Update - see above