Contents  on 2 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 2 March '18

Ten objects reported inside ten LD

Ten asteroids are known to be within ten lunar distances (LD) of Earth today. Nearest is intruder 2018 DV1, which began the day at 0.45 LD from Earth, passed us at 0.29 LD at 0553 LD, and will end the day just outside the Earth-Moon system at 1.09 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
0.29 LD today 2018 DV1 7 m  0.29 LD Feb. 22 - March 9 intruder today, NHATS target, Earth closest at 0553 UTC
0.74 LD Feb. 25 2018 DU 8 m  4.23 to 5.19 LD Feb. 15 - March 7 intruder, NHATS target
2.29 LD Feb. 25 2018 DR 11 m  8.01 to 9.52 LD Feb. 18 - tomorrow NHATS target
3.76 LD March 7 2017 VR12 276 m  7.17 from 8.40 LD Feb. 28 - March 13 radar/NHATS target
3.87 LD yesterday 2018 DW1 15 m  4.72 to 6.67 LD Feb. 25 - March 4
4.18 LD Feb. 27 2018 DT 13 m  4.50 to 4.74 LD Feb. 11 - March 15 NHATS target
5.09 LD today 2018 DU1 9 m  5.09 LD Feb. 24 - March 8 NHATS target, Earth closest at 1137 UTC, risk
5.44 LD Feb. 27 2018 CU14 10 m  5.99 to 6.45 LD Feb. 19 - March 8 NHATS target
6.66 LD Jan. 15 2018 AV2 6 m  9.87 to 10.01 LD Nov. 10 - today NHATS target, exits ten LD, natural? - DOU
9.27 LD tomorrow 2018 DC 39 m  9.36 from 9.78 LD yesterday - March 5 NHATS target

This report was generated at 1910 UTC with astrometry from February in today's DOU MPEC for 2018 AV2, which today leaves our ten-LD reporting zone, finishing an unusual traverse that began last November 10th.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
6.9   LD March 10* 2015 DK200 26 m  14.7 from 16.3 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
9.1   LD March 27* 2018 DH1 208 m  83.4 from 87.1 LD March 26 - 28 EPU +/- 8.45 hours*
* 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 2 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, eight were "one nighters." So far The Tracking News has counted a total of 42 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 2 March '18

Minor Planet Electronic Circulars

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

<< DOU on 2 Mar. '18 >>  MPEC 2018-E03 - "13:07 UT" - Daily Orbit Update

Observers  on 2 March '18

Five observers appear in today's MPEC.

CodeObserver / observatory
566NEAT's GEODSS Haleakala telescope in Hawaii, 2 in MPEC 2018-E03 -- 465166, 143992
608NEAT's USAF Haleakala telescope in Hawaii, 2 in MPEC 2018-E03 -- 99248, 265196
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2018-E03 -- 2018 CQ3, 2018 AV2
W885M. Kumrucu-Lohmiller in Massachusetts via Chile Obs. in Chile, 1 in MPEC 2018-E03 -- 276033
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-E03 -- 2017 BD29
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 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.





Notes for Today's Latest Risk Assessments
2008 EK68JPL Sentry19002019-21172433.2079547e-06-7.65-8.700JPL: Computed at 23:08 April 6th of 2017 Pacific time based on 10 observations spanning .04006 days (2008-Mar-05.4406 to 2008-Mar-05.48066). Diameter approximately 0.004 km. from weighted mean H=29.76.

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 2 March '18

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

1910Generated Traffic Report
1900Noted that JPL Sentry has updated its 2008 EK68 risk assessment - see above
1700Grabbed MPEC 2018-E03 - Daily Orbit Update - see above