Contents  on 12 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 12 March '18

Six objects reported inside ten LD

There are six planetesimals known to be within ten lunar distances (LD) of Earth today, none of them particularly close. The nearest is 2018 DY3, which heads out from 5.50 to 6.26 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
3.32 LD March 4 2018 DC4 11 m  7.11 to 7.89 LD Feb. 22 - March 15 NHATS target
3.76 LD March 7 2017 VR12 257 m  7.58 to 8.82 LD Feb. 28 - tomorrow radar/NHATS target
4.18 LD Feb. 27 2018 DT 13 m  8.49 to 8.98 LD Feb. 11 - March 15 NHATS target
4.37 LD March 18 2018 ET1 18 m  8.35 from 9.52 LD yesterday - March 24 NHATS target
5.26 LD yesterday 2018 DY3 20 m  5.50 to 6.26 LD March 6 - 15 NHATS target
7.02 LD March 10 2015 DK200 26 m  7.67 to 8.56 LD March 6 - 14 NHATS target

This report was generated at 1741 UTC with first follow-up for departed objects 2018 EX1 and 2018 EW1 in today's DOU MPEC, along with continuing follow-up for approaching 2018 DH1 and departed 2018 EE1, plus astrometry from April 2017 for 2017 FR63.

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  10.79 from 12.27 LD tomorrow - March 16
7.7   LD March 22* 2018 EV1 28 m  24.9 from 27.4 LD March 19 - 24 EPU +/- 31 mins.*
9.17 LD March 27 2018 DH1 214 m  48.63 from 52.02 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. 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 12 March '18

The MPC's NEO Confirmation Page has 40 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 40 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 54 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 12 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-E78 - "22:34 UT" - 2015 FU403


MPEC 2018-E77 - "22:15 UT" - 2015 RL258


MPEC 2018-E76 - "21:06 UT" - 2015 UH87


MPEC 2018-E75 - "21:03 UT" - 2015 PZ315


MPEC 2018-E74 - "14:37 UT" - 2018 ER2


MPEC 2018-E73 - "14:33 UT" - 2018 EV2


MPEC 2018-E72 - "14:29 UT" - 2018 EU2


MPEC 2018-E71 - "14:24 UT" - 2018 ET2


MPEC 2018-E70 - "14:18 UT" - 2018 ES2


<< DOU on 12 Mar. '18 >>  MPEC 2018-E69 - "13:03 UT" - Daily Orbit Update

Observers  on 12 March '18

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPECs 2018-E69 & 2018-E72 -- 2018 EU2, 2018 CQ1, 2018 BL5, 2018 AG
T05ATLAS Haleakala in Hawaii, 5 in MPEC 2018-E69 -- 475967, 152931, 3752, 1981, 1866
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2018-E69 -- 96315, 385580, 162882, 143992, 7977, 6053
807.Scott Sheppard via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2018-E75 & 2018-E77 -- 2015 RL258, 2015 PZ315
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2018-E69, 2018-E70, 2018-E71 & 2018-E74 -- 2018 ET2, 2018 ES2, 2018 ER2, 2018 DE2, 2018 BL6, 2017 YP5, 2017 YF7, 2017 UP2
W78Clay Telescope, 1 in MPEC 2018-E69 -- 3122
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-E69 -- 152952
Q67JBL Obs., 1 in MPEC 2018-E69 -- 1865
304Las Campanas Obs. in Chile, 4 in MPECs 2018-E75, 2018-E76, 2018-E77 & 2018-E78 -- 2015 UH87, 2015 RL258, 2015 PZ315, 2015 FU403
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-E72 -- 2018 EU2
5685Scott Sheppard on Mauna Kea in Hawaii, 1 in MPEC 2018-E78 -- 2015 FU403
474Mt. John Obs. in New Zealand, 1 in MPEC 2018-E71 -- 2018 ET2
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2018-E69 & 2018-E72 -- 2018 EU2, 2016 CL32, 2015 DP155, 2010 FL, 265196, 152889
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2018-E69 -- 3361
608NEAT's USAF Haleakala telescope in Hawaii, 2 in MPEC 2018-E69 -- 152889, 3361
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2018-E69 -- 154652, 143992
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2018-E70, 2018-E71, 2018-E73 & 2018-E74 -- 2018 EV2, 2018 ET2, 2018 ES2, 2018 ER2
D29Purple Mtn. Obs. Xuyi Station in China, 6 in MPEC 2018-E69 -- 2018 DH1, 2018 CZ13, 2009 SK2, 322763, 212359, 1627
033Schwarzschild Obs. in Germany, 1 in MPEC 2018-E72 -- 2018 EU2
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-E69 -- 2018 DX3
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-E70 -- 2018 ES2
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2018-E69 -- 2018 CR1, 2017 XQ2
I52Steward Obs. Mt. Lemmon Station in Arizona, 9 in MPECs 2018-E69, 2018-E72 & 2018-E73 -- 2018 EX1, 2018 EW1, 2018 EV2, 2018 EU2, 2018 EP1, 2018 EF, 2018 EE1, 2018 EC1, 2018 EA1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-E69 -- 2017 FR63
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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
2008 EM68JPL Sentry18012018-211611091.32512692e-05-5.18-5.470JPL: Computed at 00:27 April 7th of 2017 Pacific time based on 12 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183). Diameter approximately 0.010 km. from weighted mean H=27.72.
2008 EL68JPL Sentry18012018-21136083.24472158e-05-5.39-6.210JPL: 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=27.92.
2005 ED224JPL Sentry18012023-206452.614948e-06-3.90-3.930JPL: Computed at 11:42 April 7th of 2017 Pacific time based on 11 observations spanning 3.1215 days (2005-Mar-13.26326 to 2005-Mar-16.38477). Diameter approximately 0.054 km. from weighted mean H=23.98.

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 12 March '18

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

2300Grabbed MPEC 2018-E78 - 2015 FU403 - see above
2233Grabbed MPEC 2018-E77 - 2015 RL258 - see above
2133Grabbed MPEC 2018-E75 - 2015 PZ315 - see above
Grabbed MPEC 2018-E76 - 2015 UH87 - see above
1801Noted that JPL Sentry has updated its 2005 ED224 risk assessment - see above
Noted that JPL Sentry has updated its 2008 EL68 risk assessment - see above
Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
1741Generated Traffic Report
1546Grabbed MPEC 2018-E69 - Daily Orbit Update - see above
Grabbed MPEC 2018-E70 - 2018 ES2 - see above
Grabbed MPEC 2018-E71 - 2018 ET2 - see above
Grabbed MPEC 2018-E72 - 2018 EU2 - see above
Grabbed MPEC 2018-E73 - 2018 EV2 - see above
Grabbed MPEC 2018-E74 - 2018 ER2 - see above