Contents  on 11 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 11 March '18

Six objects reported inside ten LD

There are six asteroids reported inside ten lunar distances (LD) of Earth today. Nearest is 2018 DY3, which comes its closest to our planet this time around -- 5.26 LD at 0235 UTC.

T

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
3.32 LD March 4 2018 DC4 11 m  6.35 to 7.11 LD Feb. 22 - March 15 NHATS target
3.76 LD March 7 2017 VR12 257 m  6.40 to 7.58 LD Feb. 28 - March 13 radar/NHATS target
4.18 LD Feb. 27 2018 DT 13 m  8.00 to 8.49 LD Feb. 11 - March 15 NHATS target
4.37 LD March 18 2018 ET1 18 m  9.52 from 10.74 LD today - March 24 NHATS target, enters ten LD
5.26 LD today 2018 DY3 20 m  5.26 LD March 6 - 15 NHATS target, Earth closest at 0235 UTC - DOU
7.02 LD yesterday 2015 DK200 26 m  7.14 to 7.67 LD March 6 - 14 NHATS target

This report was generated at 1942 UTC with first follow-up for departed 2018 ED1 in today's DOU MPEC along with follow-up for approaching 2018 DH1, passing 2018 DY3, and distant 2017 DC36 (16.18 days added to 1.07-day recovery arc), plus astrometry from November 2017 for 2017 VD.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.19 LD March 15 2018 EH 45 m  12.27 from 14.03 LD March 13 - 16
7.7   LD March 22* 2018 EV1 28 m  27.4 from 29.8 LD March 19 - 24 EPU +/- 31 mins.*
9.17 LD March 27 2018 DH1 214 m  52.01 from 55.43 LD March 26 - 28 DOU
* 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. "Distant" is used here to describe an object that has approached Earth within ten LD since A/CC began these traffic reports eleven years ago but is not currently coming 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 11 March '18

The MPC's NEO Confirmation Page has 48 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 48 objects listed. Of these, 23 were "one nighters." So far The Tracking News has counted a total of 67 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 11 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-E68 - "23:11 UT" - 2018 EN2


MPEC 2018-E67 - "23:08 UT" - 2018 EM2


MPEC 2018-E66 - "23:04 UT" - 2018 EL2


MPEC 2018-E65 - "23:01 UT" - 2018 EK2


MPEC 2018-E64 - "22:57 UT" - 2018 EJ2


MPEC 2018-E63 - "21:32 UT" - 2015 DD155


MPEC 2018-E62 - "21:14 UT" - 2016 PM


MPEC 2018-E61 - "21:12 UT" - 2015 JY1


MPEC 2018-E60 - "16:24 UT" - 2015 RK258


<< DOU on 11 Mar. '18 >>  MPEC 2018-E59 - "13:03 UT" - Daily Orbit Update

Observers  on 11 March '18

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 1 in MPEC 2018-E59 -- 8037
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2018-E59 & 2018-E62 -- 2018 CQ1, 2016 PM, 2016 AH8, 2015 CU, 2000 WY28, 332446
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2018-E59 -- 138847, 1981, 1036
703Catalina Sky Survey (CSS) in Arizona, 12 in MPEC 2018-E59 -- 2017 SL33, 2015 RL82, 2012 DG61, 88213, 509520, 27346, 265196, 6455, 3752, 3122, 1981, 1864
807.Scott Sheppard via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-E60 -- 2015 RK258
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2018-E61, 2018-E63, 2018-E64, 2018-E65, 2018-E67 & 2018-E68 -- 2018 EN2, 2018 EM2, 2018 EK2, 2018 EJ2, 2015 JY1, 2015 DD155
K88GINOP-KHK in Hungary, 1 in MPEC 2018-E59 -- 2014 QP266
J95Great Shefford Obs. in England, 3 in MPEC 2018-E59 -- 2018 EF1, 2018 EE, 2018 DY3
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-E67 -- 2018 EM2
304Las Campanas Obs. in Chile, 1 in MPEC 2018-E60 -- 2015 RK258
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2018-E65, 2018-E66 & 2018-E68 -- 2018 EN2, 2018 EL2, 2018 EK2
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2018-E64 -- 2018 EJ2
474Mt. John Obs. in New Zealand, 12 in MPEC 2018-E59 -- 2018 EY, 2018 EX, 2018 DB4, 2018 DA2, 2018 CP3, 2017 YC8, 2017 XB2, 2017 WX14, 2017 VU14, 2017 DC36, 2016 GA222, 2016 FS6
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2018-E59 -- 2013 AW60, 137078
I41Palomar Transient Factory (PTF) in southern California, 5 in MPEC 2018-E59 -- 2018 DX3, 190208, 172034, 154347, 8709
F51Pan-STARRS 1 (PS1) in Hawaii, 18 in MPECs 2018-E59, 2018-E64, 2018-E65, 2018-E66, 2018-E67 & 2018-E68 -- 2018 EY, 2018 EN2, 2018 EM2, 2018 EL2, 2018 EK2, 2018 EJ2, 2018 ED1, 2018 DA4, 2018 CB15, 2018 BO3, 2013 QH10, 2012 QP17, 68548, 444185, 337557, 322763, 12923, 7753
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2018-E67 -- 2018 EM2
D29Purple Mtn. Obs. Xuyi Station in China, 11 in MPEC 2018-E59 -- 2018 DH1, 2014 QP266, 1999 FN19, 385580, 322763, 276033, 143992, 137805, 136793, 7977, 6053
C95SATINO-1 in France, 1 in MPEC 2018-E59 -- 2017 VD
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2018-E66 & 2018-E68 -- 2018 EN2, 2018 EL2
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2018-E59 -- 2018 BA7
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-E59 -- 2017 BG32
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 EENEODyS1830208811.23e-08-6.62-6.620NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2018-03-06.171 to 2018-03-10.918."
JPL Sentry1626R E M O V E DJPL: Risk listing removed at 1554 UTC today
2008 EL68JPL Sentry16262018-21136093.27862158e-05-5.30-6.010JPL: Computed at 11:57 April 9th of 2017 Pacific time based on 8 observations spanning .07124 days (2008-Mar-06.40768 to 2008-Mar-06.47892). Diameter approximately 0.009 km. from weighted mean H=27.91.

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 11 March '18

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

2333Grabbed MPEC 2018-E66 - 2018 EL2 - see above
Grabbed MPEC 2018-E67 - 2018 EM2 - see above
Grabbed MPEC 2018-E68 - 2018 EN2 - see above
2305Grabbed MPEC 2018-E64 - 2018 EJ2 - see above
Grabbed MPEC 2018-E65 - 2018 EK2 - see above
2230Grabbed MPEC 2018-E61 - 2015 JY1 - see above
Grabbed MPEC 2018-E62 - 2016 PM - see above
Grabbed MPEC 2018-E63 - 2015 DD155 - see above
1942Generated Traffic Report
1830Noted that NEODyS has posted 2018 EE as an impact risk - see above
Grabbed MPEC 2018-E60 - 2015 RK258 - see above
1626Noted that JPL Sentry has updated its 2008 EL68 risk assessment - see above
Noted that JPL Sentry has removed 2018 EE as an impact risk - see above
Grabbed MPEC 2018-E59 - Daily Orbit Update - see above