Contents  on 5 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 5 March '18

Eight objects reported inside ten LD

There are eight minor objects reported to be less than ten lunar distances (LD) of our planet today. Nearest is 2018 DC4, which is outbound from 3.32 to 3.48 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 March 2 2018 DV1 7 m  3.79 to 5.15 LD Feb. 22 - March 9 intruder, NHATS target
0.74 LD Feb. 25 2018 DU 8 m  7.13 to 8.10 LD Feb. 15 - March 7 intruder, NHATS target
3.32 LD yesterday 2018 DC4 11 m  3.32 to 3.48 LD Feb. 22 - March 15 NHATS target
3.76 LD March 7 2017 VR12 274 m  4.20 from 4.99 LD Feb. 28 - March 13 radar/NHATS target - DOU
4.18 LD Feb. 27 2018 DT 13 m  5.39 to 5.77 LD Feb. 11 - March 15 NHATS target
5.09 LD March 2 2018 DU1 9 m  6.20 to 7.10 LD Feb. 24 - March 8 NHATS target, risk
5.44 LD Feb. 27 2018 CU14 10 m  7.68 to 8.40 LD Feb. 19 - March 8 NHATS target
9.27 LD March 3 2018 DC 39 m  9.57 to 10.18 LD March 1 - 5 NHATS target, exits ten LD

This report was generated at 1952 UTC with today's DOU MPEC posting the discovery of risk-listed 2018 DO3 at magnitude 23.0 using an unspecified observing system on Mauna Kea that alone tracked this object, reporting 63 positions over a period of 4.455 hours on February 17th. From this it is calculated that this object passed Earth at about 4.4 LD on February 9th, but with an uncertaintly of plus-or-minus 2.26 days. The DOU also has the recovery of distant 2005 GR33, follow-up for inbound 2017 VR12, and astrometry from October 2015 for 2015 TC25.

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  10.3 from 11.7 LD tomorrow - March 14 EPU +/- 23.45 hours*, NHATS target
5.28 LD March 11 2018 DY3 20 m  10.62 from 12.23 LD tomorrow - March 15 NHATS target
9.1   LD March 27* 2018 DH1 208 m  72.5 from 76.1 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. "Distant" is used here to describe an object that has come within ten LD since A/CC began these traffic reports (2007) but is not presently 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 5 March '18

The MPC's NEO Confirmation Page has 9 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine objects listed. Of these, two were "one nighters."

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 5 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 5 Mar. '18 >>  MPEC 2018-E19 - "13:01 UT" - Daily Orbit Update

Observers  on 5 March '18

Thirteen observers appear in today's MPEC.

CodeObserver / observatory
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2018-E19 -- 2018 BY2, 2018 AM12, 2018 AL18, 2017 YF5, 2017 WY12, 2017 UY4
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2018-E19 -- 2015 TC25
238Grorudalen Obs. in Norway, 1 in MPEC 2018-E19 -- 2017 VR12
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 10 in MPEC 2018-E19 -- 2018 DS, 2018 BO1, 2018 AG, 2017 SS19, 2017 QV34, 2017 BD29, 2016 FA4, 2014 OX299, 2012 DJ61, 2005 GR33
568Mauna Kea in Hawaii, 6 in MPEC 2018-E19 -- 2018 DQ3, 2018 DP3, 2018 DO3, 2018 DN3, 2018 DM3, 2018 DL3
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-E19 -- 2017 VR12
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2018-E19 -- 2017 VR12
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-E19 -- 444935
654Pomona College Table Mtn. Obs. in southern California, 1 in MPEC 2018-E19 -- 6063
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-E19 -- 2018 CO2
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-E19 -- 2018 CS2
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-E19 -- 36284
W33Transit Dreams Obs., 1 in MPEC 2018-E19 -- 1980
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 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
2018 DO3JPL Sentry17212046-2115183.39709e-08-9.32-10.10JPL: Computed at 08:58 today Pacific time based on 63 observations spanning .18562 days (2018-Feb-17.28367 to 2018-Feb-17.46929). Diameter approximately 0.005 km. from weighted mean H=29.05.

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 5 March '18

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

1952Generated Traffic Report
1721Noted that JPL Sentry has posted 2018 DO3 as an impact risk - see above
Grabbed MPEC 2018-E19 - Daily Orbit Update - see above