Contents  on 18 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 18 March '18

Four objects reported inside ten LD

There are four small Solar-System bodies known to be within ten lunar distances (LD) of Earth today. Nearest is 2018 FE, which gets its closest on this visit, coming to 3.93 LD at 1349 UTC. Just beyond that, 2018 ET1 also comes its closest -- 4.38 LD at 0631 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
0.56 LD March 14 2018 EZ2 17 m  8.15 to 10.23 LD March 9 - 18 intruder, exits ten LD, risk
1.45 LD March 16 2018 EB4 28 m  5.28 to 8.11 LD March 12 - 19 risk
3.93 LD today 2018 FE 8 m  3.93 LD March 15 - 21 Earth closest at 1349 UTC
4.38 LD today 2018 ET1 18 m  4.38 LD March 11 - 24 NHATS target, Earth closest at 0631 UTC

This report was generated at 1844 UTC with the discoveries of already departed 2018 FW (MPEC), which passed us at 6.52 LD on March 12th, and 2018 FT (MPEC), which went by at 7.44 LD on March 14th. Today's DOU MPEC has additional observation from February of risk-listed 2018 DU1, first follow-up for departed 2018 ET3, and continuing follow-up for approaching objects 2018 FB and 2018 DH1, for departed objects 2018 EW1, 2018 ED1, and 2018 DT, and for distant objects 2017 DC36 and 450894 2008 BT18.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
7.73 LD March 22 2018 EV1 28 m  11.55 from 13.53 LD tomorrow - March 24
4.9   LD March 29* 2018 FB 63 m  21.4 from 23.3 LD March 25 - April 3 EPU +/- 1.63 hours* - DOU
9.17 LD March 27 2018 DH1 214 m  29.02 from 32.19 LD March 26 - 28 DOU
6.2   LD April 1* 2018 EM4 27 m  19.3 from 20.7 LD March 26 - April 6 EPU +/- 5 mins.*, NHATS target
4.0   LD April 2* 2004 FG29 21 m  49.6 from 53.1 LD March 30 - April 5 EPU +/- 1.03 hours*
5.8   LD June 11* 2018 EJ4 175 m  111.9 from 113.4 LD June 5 - 16 EPU +/- 19.57 hours*, NHATS target
* EPU = Earth passage uncertainty


<< Reading:  U.S. Lawrence Livermore National Lab has a news item about how its scientists "are part of a national planetary defense team that designed a conceptual spacecraft [dubbed HAMMER] to deflect Earth-bound asteroids" (see also).



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. "Distant" is used here to describe an object that has come within ten LD since A/CC began these traffic reports (2007) but is not presently so close. 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 18 March '18

The MPC's NEO Confirmation Page has 69 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 69 objects listed. Of these, 50 were "one nighters." So far The Tracking News has counted a total of 89 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 18 March '18

Minor Planet Electronic Circulars

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


MPEC 2018-F36 - "22:00 UT" - 2018 FY


MPEC 2018-F35 - "14:19 UT" - 2018 FU


MPEC 2018-F34 - "14:14 UT" - 2018 FW


MPEC 2018-F33 - "14:08 UT" - 2018 FV


MPEC 2018-F32 - "14:00 UT" - 2018 FT


<< DOU on 18 Mar. '18 >>  MPEC 2018-F31 - "12:03 UT" - Daily Orbit Update


MPEC 2018-F30 - "11:46 UT" - 2011 FG


MPEC 2018-F29 - "11:44 UT" - 2001 TB45


MPEC 2018-F28 - "11:34 UT" - 2009 SK104


MPEC 2018-F27 - "01:29 UT" - 2018 FH

Observers  on 18 March '18

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 4 in MPEC 2018-F31 -- 2018 DJ, 2018 DH1, 3752, 1981
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2018-F31 & 2018-F36 -- 2018 FY, 2018 EO4, 2018 DU1, 2018 CV1, 2018 BA7, 2002 XC91, 513182
T05ATLAS Haleakala in Hawaii, 22 in MPEC 2018-F31 -- 2018 EE, 2018 DX3, 2015 RL82, 2005 OX, 85953, 511808, 509520, 505657, 497117, 450894, 388945, 248926, 172034, 152931, 11066, 9856, 3752, 3122, 1981, 1866, 1864, 1627
703Catalina Sky Survey (CSS) in Arizona, 17 in MPECs 2018-F28, 2018-F31 & 2018-F35 -- 2018 FU, 2009 SK2, 2009 SK104, 1994 RC, 85953, 66251, 53435, 465166, 368664, 25916, 248926, 214869, 136618, 12923, 9856, 7753, 1627
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 14 in MPECs 2018-F28, 2018-F29, 2018-F30, 2018-F31, 2018-F34 & 2018-F35 -- 2018 FW, 2018 FU, 2018 EZ3, 2018 EW3, 2018 EK2, 2018 ED1, 2018 AM12, 2018 AL18, 2017 YF5, 2017 SG14, 2011 FG, 2009 SK104, 2007 EM, 2001 TB45
J95Great Shefford Obs. in England, 2 in MPECs 2018-F32 & 2018-F35 -- 2018 FU, 2018 FT
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 5 in MPECs 2018-F31 & 2018-F35 -- 2018 FU, 172034, 14402, 3752, 1981
Z43Landehen Obs., 1 in MPEC 2018-F31 -- 276033
844Los Molinos Obs. in Uruguay, 1 in MPEC 2018-F31 -- 138847
900Moriyama Obs. in Japan, 2 in MPECs 2018-F34 & 2018-F35 -- 2018 FW, 2018 FU
474Mt. John Obs. in New Zealand, 10 in MPECs 2018-F28 & 2018-F31 -- 2018 ER1, 2018 EC1, 2018 DE2, 2018 DD4, 2018 BY2, 2018 AP12, 2017 DC36, 2016 GA222, 2016 CL136, 2009 SK104
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2018-F31, 2018-F32, 2018-F33, 2018-F34, 2018-F35 & 2018-F36 -- 2018 FY, 2018 FW, 2018 FV, 2018 FU, 2018 FT, 2018 DY1, 2018 AO18, 2017 UA1, 2015 EL7, 53435, 15745, 155341
F51Pan-STARRS 1 (PS1) in Hawaii, 17 in MPECs 2018-F27, 2018-F30, 2018-F31 & 2018-F33 -- 2018 FV, 2018 FH, 2018 FB, 2018 CU1, 2014 RX30, 2013 NZ23, 2011 FG, 2010 LM14, 85953, 66251, 454100, 387505, 363599, 214869, 159402, 136874, 4179
B49Paus Obs. in Spain, 2 in MPECs 2018-F34 & 2018-F35 -- 2018 FW, 2018 FU
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2018-F31 -- 2018 DH1, 2015 XE352
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-F31 -- 2018 DX3
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-F34 -- 2018 FW
W887program code 7 via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-F31 -- 2018 DH1
691Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2018-F31 -- 2018 EZ, 2018 EY3, 2018 EW3, 2018 EW1, 2018 EM2, 2018 EE4, 2018 DW3, 2018 DT, 2009 HD21
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2018-F31 -- 2018 ET3, 2018 EF, 2018 ED4, 2018 DZ1, 2014 AN51
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-F31 -- 2018 FB, 322763
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2018-F31 -- 2018 DH1
I52Steward Obs. Mt. Lemmon Station in Arizona, 24 in MPECs 2018-F28, 2018-F31, 2018-F32, 2018-F33, 2018-F34, 2018-F35 & 2018-F36 -- 2018 FY, 2018 FW, 2018 FV, 2018 FU, 2018 FT, 2018 EZ3, 2018 EW1, 2018 ES2, 2018 EO4, 2018 EE4, 2018 DY1, 2018 DJ4, 2018 DF2, 2018 DE2, 2018 DB2, 2018 DA4, 2018 CK14, 2018 CB15, 2018 AZ, 2017 XH62, 2017 UA1, 2017 SE19, 2009 SK104, 172034
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2018-F35 -- 2018 FU
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-F31 -- 2016 UB57, 2011 EO51
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 ED4NEODyS19372027-2112309.42e-07-3.28-3.620NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2018-03-10.307 to 2018-03-17.270."
JPL Sentry16302027-2112174.034195e-07-3.98-4.510JPL: Computed at 08:54 today Pacific time based on 25 observations spanning 6.9636 days (2018-Mar-10.30583 to 2018-Mar-17.26939). Diameter approximately 0.410 km. from weighted mean H=19.56.
2018 EA4NEODyS1937R E M O V E D-
2018 EV3NEODyS19372081-211377.43e-07-7.31-7.540NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2018-03-09.277 to 2018-03-13.338."
2018 DU1NEODyS19372093-211621.9e-08-9.39-9.480NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2018-02-25.205 to 2018-02-27.252."
JPL Sentry16302078-209522.0981e-07-8.24-8.320JPL: Computed at 08:32 today Pacific time based on 31 observations spanning 2.0468 days (2018-Feb-25.20469 to 2018-Feb-27.251516). Diameter approximately 0.010 km. from weighted mean H=27.73.

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 18 March '18

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

2211Grabbed MPEC 2018-F36 - 2018 FY - see above
1937Noted that NEODyS has updated its 2018 DU1 risk assessment - see above
Noted that NEODyS has removed 2018 EA4 as an impact risk - see above
Noted that NEODyS has updated its 2018 ED4 risk assessment - see above
Noted that NEODyS has updated its 2018 EV3 risk assessment - see above
1844Generated Traffic Report
1630Noted that JPL Sentry has updated its 2018 DU1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 ED4 risk assessment - see above
Grabbed MPEC 2018-F28 - 2009 SK104 - see above
Grabbed MPEC 2018-F29 - 2001 TB45 - see above
Grabbed MPEC 2018-F30 - 2011 FG - see above
Grabbed MPEC 2018-F31 - Daily Orbit Update - see above
Grabbed MPEC 2018-F32 - 2018 FT - see above
Grabbed MPEC 2018-F33 - 2018 FV - see above
Grabbed MPEC 2018-F34 - 2018 FW - see above
Grabbed MPEC 2018-F35 - 2018 FU - see above
0234Grabbed MPEC 2018-F27 - 2018 FH - see above