Contents  on 15 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 15 March '18

Eight objects reported inside ten LD

Eight transient natural objects are reported to be within ten lunar distances (LD) of our planet today. Nearest are two risk-listed objects. 2018 EB4 enters Earth's sphere of gravitational influence (SOI), zipping in from 3.91 to 1.62 LD, and intruder 2018 EZ2 leaves the SOI, heading out from 1.95 to 4.00 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
0.56 LD yesterday 2018 EZ2 17 m  1.95 to 4.00 LD March 9 - 18 intruder, exits Earth SOI, risk - DOU
1.45 LD tomorrow 2018 EB4 28 m  1.62 from 3.91 LD March 12 - 19 enters Earth SOI, risk - DOU
3.32 LD March 4 2018 DC4 11 m  9.51 to 10.34 LD Feb. 22 - today NHATS target, exits ten LD
4.18 LD Feb. 27 2018 DT 13 m  9.97 to 10.48 LD Feb. 11 - today NHATS target, exits ten LD
4.38 LD March 18 2018 ET1 18 m  5.35 from 6.22 LD March 11 - 24 NHATS target - DOU
4.96 LD March 9 2018 EF4 20 m  8.81 to 9.90 LD March 2 - 16 DOU
5.26 LD March 11 2018 DY3 20 m  8.75 to 10.25 LD March 6 - 15 NHATS target, exits ten LD
9.19 LD today 2018 EH 47 m  9.19 LD March 13 - 16 Earth closest at 0702 UTC

This report was generated at 1808 UTC with first follow-up for approaching 2018 EV1 and risk-listed inbound 2018 EB4 in today's DOU MPEC, along with additional observations for outbound objects 2018 EF4 and risk-listed intruder 2018 EZ2, and continuing follow-up for approaching 2018 DH1, inbound 2018 ET1, and departed objects 2018 EW1 and 2018 EE1.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
7.69 LD March 22 2018 EV1 27 m  17.83 from 20.13 LD March 19 - 24 DOU
9.17 LD March 27 2018 DH1 214 m  38.64 from 41.93 LD March 26 - 28 DOU



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 15 March '18

The MPC's NEO Confirmation Page has 31 listings

When last checked at 2300 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 31 objects listed. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 34 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 15 March '18

Minor Planet Electronic Circulars

As of last check at 2300 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-E111 - "16:16 UT" - 2015 FB34


<< DOU on 15 Mar. '18 >>  MPEC 2018-E110 - "12:02 UT" - Daily Orbit Update

Observers  on 15 March '18

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 1 in MPEC 2018-E110 -- 2018 EZ2
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2018-E110 -- 2018 DG, 2018 CQ1, 2017 WX, 2017 WE16, 2017 UY4, 2012 QP10, 332446, 267720, 152680
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2018-E110 -- 2018 CU1, 1999 FN19, 1999 AF4, 162038
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-E110 -- 2018 EF4
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPECs 2018-E110 & 2018-E111 -- 2018 EF4, 2015 FB34
734Farpoint Obs. in Kansas, 1 in MPEC 2018-E110 -- 2018 DX1
K88GINOP-KHK in Hungary, 1 in MPEC 2018-E110 -- 2018 EB4
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-E110 -- 2018 EZ2
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 2 in MPEC 2018-E110 -- 2018 EZ2, 2018 DH1
W85LCO Cerro Tololo A in Chile, 3 in MPEC 2018-E110 -- 2018 ER1, 388189, 216985
W87LCO Cerro Tololo C in Chile, 2 in MPEC 2018-E110 -- 388189, 216985
K91LCO Sutherland A in South Africa, 2 in MPEC 2018-E110 -- 388189, 216985
G96Mt. Lemmon Survey (MLS) in Arizona, 15 in MPEC 2018-E110 -- 2018 EV1, 2018 EB4, 2018 DK3, 2014 QW432, 68278, 511243, 510238, 509935, 505667, 385497, 208617, 163692, 162882, 7977, 5620
566NEAT's GEODSS Haleakala telescope in Hawaii, 1 in MPEC 2018-E110 -- 12923
644NEAT's Mt. Palomar telescope in southern California, 5 in MPEC 2018-E110 -- 86450, 31346, 162998, 136618, 12923
608NEAT's USAF Haleakala telescope in Hawaii, 3 in MPEC 2018-E110 -- 86450, 136618, 12923
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-E110 -- 2018 DH1, 137062, 1981
C23Olmen Obs. in Belgium, 1 in MPEC 2018-E110 -- 2015 XE352
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-E110 -- 2013 QH10
D29Purple Mtn. Obs. Xuyi Station in China, 17 in MPEC 2018-E110 -- 2018 DH1, 2018 DB2, 2018 CX13, 2018 BP5, 2018 BO3, 2015 XE352, 2014 DT110, 508861, 358744, 322763, 190208, 185853, 172034, 162011, 12923, 101873, 3271
587Sormano Obs. in Italy, 1 in MPEC 2018-E110 -- 2018 EB4
I52Steward Obs. Mt. Lemmon Station in Arizona, 8 in MPEC 2018-E110 -- 2018 EW1, 2018 ET1, 2018 EP1, 2018 EE1, 2018 EC1, 2018 DJ4, 2018 DA2, 2017 UR7
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2018-E110 -- 2018 EF4
Z52The Studios Obs., 1 in MPEC 2018-E110 -- 311554
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-E110 -- 2017 BD29
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 March '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2300 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 EB4JPL Sentry15512099-210323.95336e-06-5.76-5.770JPL: Computed at 08:11 today Pacific time based on 79 observations spanning 2.4345 days (2018-Mar-12.34928 to 2018-Mar-14.78379). Diameter approximately 0.028 km. from weighted mean H=25.39.
2018 EZ2JPL Sentry17062056-210585.64946e-06-5.99-6.060JPL: Computed at 08:51 today Pacific time based on 80 observations spanning 1.1748 days (2018-Mar-12.42083 to 2018-Mar-13.59564). Diameter approximately 0.017 km. from weighted mean H=26.53.
2018 EENEODyS1551R E M O V E D-
2018 EBNEODyS1551R 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 15 March '18

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

1808Generated Traffic Report
1706Noted that JPL Sentry has updated its 2018 EZ2 risk assessment - see above
Grabbed MPEC 2018-E111 - 2015 FB34 - see above
1551Noted that NEODyS has removed 2018 EB as an impact risk - see above
Noted that JPL Sentry has updated its 2018 EB4 risk assessment - see above
Noted that NEODyS has removed 2018 EE as an impact risk - see above
Grabbed MPEC 2018-E110 - Daily Orbit Update - see above