Contents  on 14 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 14 March '18

Nine objects reported inside ten LD

There are nine asteroids known to be inside ten lunar distances (LD) of Earth today. Risk-listed intruder 2018 EZ2 is the nearest, and starts the day at 0.61 LD from our planet, passes us at 0.56 LD at 0240 UTC, and the Moon at 0.53 LD at 1309 UTC, then finishes the day outside the Earth-Moon system at 1.95 LD from Earth.

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 today 2018 EZ2 17 m  0.56 LD March 9 - 18 intruder today, Earth closest at 0240 UTC,
Moon closest 0.53 LD at 1309 UTC, risk - DOU
1.45 LD March 16 2018 EB4 28 m  3.91 from 6.69 LD March 12 - 19 NEW, risk - DOU
3.32 LD March 4 2018 DC4 11 m  8.69 to 9.51 LD Feb. 22 - tomorrow NHATS target
4.18 LD Feb. 27 2018 DT 13 m  9.47 to 9.97 LD Feb. 11 - tomorrow NHATS target - DOU
4.37 LD March 18 2018 ET1 18 m  6.21 from 7.23 LD March 11 - 24 NHATS target
4.96 LD March 9 2018 EF4 20 m  7.79 to 8.81 LD March 2 - 16 NEW - MPEC
5.26 LD March 11 2018 DY3 20 m  7.39 to 8.75 LD March 6 - 15 NHATS target
7.02 LD March 10 2015 DK200 26 m  9.71 to 11.04 LD March 6 - 14 NHATS target, exits ten LD
9.19 LD tomorrow 2018 EH 47 m  9.21 from 9.72 LD yesterday - March 16 DOU

This report was updated at 2349 UTC with the discovery of outbound 2018 EF4 (MPEC). Your first neighborhood flying rocks traffic report was generated at 1906 UTC with the recovery of distant 2017 FZ2 (MPEC) and with the discoveries announced late yesterday of three objects: inbound risk-listed 2018 EB4 (MPEC, DOU), departed risk-listed 2018 EV3 (MPEC), which flew past us at 2.02 LD on March 6th, and departed 2018 ET3 (MPEC), which went by at 8.75 LD three days earlier. Today's DOU MPEC has first follow-up for departed 2018 ES1, additional observation of passing risk-listed intruder 2018 EZ2, and continuing follow-up for inbound 2018 EH, outbound 2018 DT, and departed objects 2018 EX1 and radar target 2018 AV2.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
7.7   LD March 22* 2018 EV1 28 m  20.2 from 22.5 LD March 19 - 24 EPU +/- 31 mins.*
9.17 LD March 27 2018 DH1 214 m  41.94 from 45.26 LD March 26 - 28
* EPU = Earth passage uncertainty


<< Reading:  The New Horizons mission has announced "Ultima Thule" as its nickname for 2014 MU69, the KBO it is now approaching. "After the flyby, NASA and the New Horizons team will choose a formal name to submit to the International Astronomical Union, based in part on whether MU69 is found to be a single body, a binary pair, or perhaps a system of multiple objects."



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 now 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 14 March '18

The MPC's NEO Confirmation Page has 34 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 34 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 43 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 14 March '18

Minor Planet Electronic Circulars

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


MPEC 2018-E109 - "21:07 UT" - Retraction of 2018 DM4


MPEC 2018-E108 - "20:34 UT" - 2018 EF4


MPEC 2018-E107 - "20:30 UT" - 2018 EE4


MPEC 2018-E106 - "20:27 UT" - 2018 ED4


MPEC 2018-E105 - "17:59 UT" - 2017 FZ2


MPEC 2018-E104 - "17:29 UT" - 2016 EL84


MPEC 2018-E103 - "17:27 UT" - 2016 CN246


<< DOU on 14 Mar. '18 >>  MPEC 2018-E102 - "12:02 UT" - Daily Orbit Update

Observers  on 14 March '18

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPECs 2018-E102, 2018-E106 & 2018-E107 -- 2018 EZ2, 2018 ES1, 2018 EE4, 2018 ED4, 2018 DM, 2018 CV1, 2017 WX12, 2017 AV3, 2015 OX78, 52760, 513489, 332446
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2018-E102 & 2018-E108 -- 2018 EF4, 1996 RY3, 36284, 194126, 163691, 9856
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2018-E103, 2018-E104, 2018-E105, 2018-E106 & 2018-E107 -- 2018 EE4, 2018 ED4, 2017 FZ2, 2016 EL84, 2016 CN246
G37Discovery Channel Telescope in Arizona, 1 in MPEC 2018-E102 -- 2018 AV2
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2018-E102 & 2018-E108 -- 2018 EY3, 2018 EF4, 2018 EE
734Farpoint Obs. in Kansas, 1 in MPEC 2018-E106 -- 2018 ED4
K88GINOP-KHK in Hungary, 1 in MPEC 2018-E108 -- 2018 EF4
J95Great Shefford Obs. in England, 4 in MPECs 2018-E102 & 2018-E108 -- 2018 EU2, 2018 EH, 2018 EF4, 2018 EB4
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-E102 -- 172034
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-E108 -- 2018 EF4
900Moriyama Obs. in Japan, 1 in MPEC 2018-E102 -- 2018 EZ2
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPEC 2018-E102 -- 2018 EG, 2017 TQ3, 2014 QP266, 513182, 511808, 508905, 496861, 434344, 385580, 154347
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-E102 -- 2368
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2018-E106 & 2018-E107 -- 2018 EE4, 2018 ED4
K63Pascoli Obs. in Italy, 1 in MPEC 2018-E108 -- 2018 EF4
W98Polonia Obs. in Chile, 1 in MPEC 2018-E102 -- 66251
L04ROASTERR-1 in Romania, 1 in MPEC 2018-E108 -- 2018 EF4
C95SATINO-1 in France, 1 in MPEC 2018-E108 -- 2018 EF4
204Schiaparelli Obs. in Italy, 2 in MPECs 2018-E107 & 2018-E108 -- 2018 EF4, 2018 EE4
587Sormano Obs. in Italy, 1 in MPEC 2018-E108 -- 2018 EF4
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2018-E102, 2018-E106 & 2018-E107 -- 2018 EE4, 2018 ED4, 2015 CX12
I52Steward Obs. Mt. Lemmon Station in Arizona, 9 in MPECs 2018-E102 & 2018-E108 -- 2018 EX1, 2018 EF4, 2018 DY1, 2018 DT, 2018 DF2, 2018 CX13, 2018 CE2, 2018 AO18, 2017 SB14
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 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 ED4JPL Sentry22012027-2116634.625566e-07-3.66-4.360JPL: Computed at 14:54 today Pacific time based on 20 observations spanning 3.9172 days (2018-Mar-10.30583 to 2018-Mar-14.22305). Diameter approximately 0.431 km. from weighted mean H=19.49.
2018 EB4JPL Sentry15002099-210323.005e-06-5.90-5.910JPL #2 for the day: Computed at 07:54 today Pacific time based on 68 observations spanning 1.6499 days (2018-Mar-12.34928 to 2018-Mar-13.99921). Diameter approximately 0.028 km. from weighted mean H=25.43.
2018 EA4JPL Sentry02102098-209819.950e-10-8.26-8.260JPL: Computed at 17:49 March 13th Pacific time based on 34 observations spanning 1.6695 days (2018-Mar-12.25221 to 2018-Mar-13.92167). Diameter approximately 0.083 km. from weighted mean H=23.05.
2018 EV3JPL Sentry02102081-211341.41681e-06-7.00-7.180JPL: Computed at 17:56 March 13th Pacific time based on 24 observations spanning 4.0610 days (2018-Mar-09.27575 to 2018-Mar-13.336702). Diameter approximately 0.013 km. from weighted mean H=27.15.
2018 EZ2JPL Sentry15002056-210595.5805375e-06-5.98-6.050JPL: Computed at 07:57 today Pacific time based on 54 observations spanning 1.1461 days (2018-Mar-12.42083 to 2018-Mar-13.56692). Diameter approximately 0.017 km. from weighted mean H=26.49.

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 14 March '18

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

2349Updated Traffic Report
2201Noted that JPL Sentry has posted 2018 ED4 as an impact risk - see above
Grabbed MPEC 2018-E109 - Retraction of 2018 DM4 - see above
2109Grabbed MPEC 2018-E106 - 2018 ED4 - see above
Grabbed MPEC 2018-E107 - 2018 EE4 - see above
Grabbed MPEC 2018-E108 - 2018 EF4 - see above
1802Grabbed MPEC 2018-E105 - 2017 FZ2 - see above
1733Grabbed MPEC 2018-E103 - 2016 CN246 - see above
Grabbed MPEC 2018-E104 - 2016 EL84 - see above
1500Noted that JPL Sentry has updated its 2018 EB4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 EZ2 risk assessment - see above
1437Grabbed MPEC 2018-E102 - Daily Orbit Update - see above
0210Noted that JPL Sentry has posted 2018 EA4 as an impact risk - see above
Noted that JPL Sentry has posted 2018 EB4 as an impact risk - see above
Noted that JPL Sentry has posted 2018 EV3 as an impact risk - see above