Contents  on 12 March '17

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 '17

Five objects reported inside ten LD

Today there are five asteroids reported flying within ten lunar distances (LD) of Earth. Closest is NHATS target 2017 DA36, headed away from 4.40 to 5.25 LD.

Earth passage I D ~Size Distance Today  Notes
4.04 LD March 102017 DA36 32 m  4.40 to 5.25 LD NHATS target - DOU
4.38 LD March 172017 EG3 18 m  9.37 from 11.06 LD enters ten LD, NHATS target
4.96 LD tomorrow2017 EK 52 m  5.69 from 7.51 LD DOU
5.86 LD March 82017 EZ2 32 m  9.44 to 11.37 LD exits ten LD
7.77 LD yesterday2017 EE3 22 m  7.77 to 8.06 LD

This report was generated at 1752 UTC with follow-up in today's DOU MPEC for three objects in the traffic tables here plus departed NHATS target 2017 DC36.

Approaching (sorted by 10-LD bubble entry date)
8.34 LD March 161998 SL36 309 m  < 10 LD March 14, radar target
7.63 LD March 262015 TC25 4 m  < 10 LD March 17, radar/NHATS target, risk
4.57 LD April 192014 JO25 812 m  < 10 LD April 18, radar target
7.92 LD May 292017 CS 438 m  < 10 LD May 26, radar target - DOU

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting on transient natural objects that approach the actually significant 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 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 '17

The MPC's NEO Confirmation Page has 59 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 59 objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 60 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 '17

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 12 Mar. '17 >>  MPEC 2017-E82 - "13:03 UT" - Daily Orbit Update

Observers  on 12 March '17

Seventeen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPEC 2017-E82 -- 2017 EN, 2017 EK, 2012 BB124, 2006 UM, 90075, 89830, 486692, 485652, 483471, 475665, 357618, 143404, 11398, 10636, 4055, 1864, 1036
T05ATLAS Haleakala in Hawaii, 6 in MPEC 2017-E82 -- 443103, 22771, 138846, 4954, 3199, 1036
160Castelmartini Obs. in Italy, 10 in MPEC 2017-E82 -- 2017 DC36, 2017 DA36, 96590, 40267, 12538, 11398, 10636, 5131, 4179, 3103
107Cavezzo Obs. in Italy, 2 in MPEC 2017-E82 -- 90075, 138155
K73Gravina Obs. in Italy, 1 in MPEC 2017-E82 -- 11398
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-E82 -- 2017 CS
K95MASTER-II Sutherland in South Africa, 2 in MPEC 2017-E82 -- 4954, 1864
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-E82 -- 433
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2017-E82 -- 484976, 484517
G34Oberfrauendorf Obs. in Germany, 3 in MPEC 2017-E82 -- 54789, 11398, 3352
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-E82 -- 274138
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2017-E82 -- 89830, 484976, 234061
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2017-E82 -- 485652
W25RMS Obs., 2 in MPEC 2017-E82 -- 2017 DA36, 138155
W885M. Kumrucu-Lohmiller in Massachusetts via Chile Obs. in Chile, 1 in MPEC 2017-E82 -- 141018
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2017-E82 -- 484976, 483656
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-E82 -- 483656
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 March '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 JPL NEO Program Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2008 EM68JPL Sentry05102017-211511431.3e-05-5.31-5.650JPL: "Analysis based on 12 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183)." Diameter approximately 0.010 km. from mean, weighted H=27.8.

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 '17

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

1752Generated Traffic Report
1553Grabbed MPEC 2017-E82 - Daily Orbit Update - see above
0510Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above