Contents  on 3 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 3 March '18

Nine objects reported inside ten LD

There are nine Solar-System small bodies reported within ten lunar distances (LD) of our home world today. Nearest is intruder 2018 DV1, which exits Earth's sphere of gravitational influence as it travels out from 1.09 to 2.44 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 yesterday 2018 DV1 7 m  1.09 to 2.44 LD Feb. 22 - March 9 intruder, NHATS target, exits Earth SOI
0.74 LD Feb. 25 2018 DU 8 m  5.19 to 6.16 LD Feb. 15 - March 7 intruder, NHATS target
2.29 LD Feb. 25 2018 DR 11 m  9.52 to 11.05 LD Feb. 18 - today NHATS target, exits ten LD
3.76 LD March 7 2017 VR12 276 m  6.02 from 7.17 LD Feb. 28 - March 13 radar/NHATS target
3.87 LD March 1 2018 DW1 15 m  6.67 to 9.04 LD Feb. 25 - tomorrow
4.18 LD Feb. 27 2018 DT 13 m  4.74 to 5.04 LD Feb. 11 - March 15 NHATS target
5.09 LD yesterday 2018 DU1 9 m  5.14 to 5.52 LD Feb. 24 - March 8 NHATS target, risk
5.44 LD Feb. 27 2018 CU14 10 m  6.45 to 7.03 LD Feb. 19 - March 8 NHATS target
9.27 LD today 2018 DC 39 m  9.27 LD March 1 - 5 NHATS target, Earth closest at 1657 UTC

This report was generated at 1948 UTC with astrometry from early February in today's DOU MPEC for intruder 2018 CN2 and follow-up from January, using the 8.2-meter Subaru telescope, to add 10.97 days to the previous 13.84-day observing arc for risk-listed 2017 YV8.

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  13.1 from 14.7 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
9.1   LD March 27* 2018 DH1 208 m  79.8 from 83.4 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 3 March '18

The MPC's NEO Confirmation Page has 32 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 32 objects listed. Of these, six were "one nighters." So far The Tracking News has counted a total of 33 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 3 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 3 Mar. '18 >>  MPEC 2018-E04 - "13:01 UT" - Daily Orbit Update

Observers  on 3 March '18

Ten observers appear in today's MPEC.

CodeObserver / observatory
K85Kelmis Obs., 1 in MPEC 2018-E04 -- 3752
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 9 in MPEC 2018-E04 -- 2018 CQ1, 2018 BZ2, 2018 BP, 2018 BM3, 2018 AG, 2017 YR1, 2017 UX5, 2017 SV20, 2015 CV13
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2018-E04 -- 2018 DE1
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2018-E04 -- 399611
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2018-E04 -- 1999 AF4, 36284
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2018-E04 -- 2018 CX13, 2018 CO2, 2017 SR32, 509520
K80Platanus Obs., 1 in MPEC 2018-E04 -- 2018 CN2
247roving observer, 1 in MPEC 2018-E04 -- 3752
247nprogram code "n" via roving observer, 1 in MPEC 2018-E04 -- 3752
W33Transit Dreams Obs., 1 in MPEC 2018-E04 -- 137925
T09UH/Tholen NEO Follow-Up Subaru Telescope in Hawaii, 1 in MPEC 2018-E04 -- 2017 YV8
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 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
2017 YV8JPL Sentry17192078-2117262.2981859e-05-6.13-6.320JPL: Computed at 08:26 today Pacific time based on 19 observations spanning 24.804 days (2017-Dec-22.42245 to 2018-Jan-16.226307). Diameter approximately 0.011 km. from weighted mean H=27.37.

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 3 March '18

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

1948Generated Traffic Report
1719Noted that JPL Sentry has updated its 2017 YV8 risk assessment - see above
Grabbed MPEC 2018-E04 - Daily Orbit Update - see above