Contents  on 14 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 14 March '17

Six objects reported inside ten LD

Six minor objects are reported flying less than ten lunar distances (LD) from Earth today. 2017 EK is the closest and is outbound from 4.96 to 5.74 LD

Earth passage I D ~Size Distance Today  Notes
4.04 LD March 102017 DA36 32 m  6.40 to 7.73 LD NHATS target
4.38 LD March 172017 EG3 18 m  6.32 from 7.77 LD NHATS target
4.96 LD yesterday2017 EK 49 m  4.96 to 5.74 LD DOU
7.04 LD March 162017 EE4 37 m  7.85 from 9.37 LD NEW - MPEC
7.77 LD March 112017 EE3 22 m  8.78 to 9.83 LD DOU
8.34 LD March 161998 SL36 309 m  9.84 from 11.95 LD enters ten LD, radar target

This report was generated at 1842 UTC with the discoveries announced late yesterday of inbound 2017 EE4 (MPEC) and two objects already departed: 2017 EL4 (MPEC), which passed our planet at 8.22 LD on March 4th, and 2017 EF4 (MPEC), which went by at 7.45 LD two days later. Today's DOU MPEC has follow-up for three objects in the traffic tables here and for two departed objects: 2017 DA38 and NHATS target 2017 DC36, plus astrometry for risk-listed 2017 BD6 from early last month.

Approaching (sorted by 10-LD bubble entry date)
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
7.93 LD May 292017 CS 437 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 14 March '17

The MPC's NEO Confirmation Page has 33 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 33 objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 37 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 14 March '17

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 14 Mar. '17 >>  MPEC 2017-E97 - "12:03 UT" - Daily Orbit Update

Observers  on 14 March '17

Thirteen observers appear in today's MPEC.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-E97 -- 2016 BO1
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2017-E97 -- 2017 DY35, 2017 DS35, 2017 DR15, 2017 DC36, 2017 DA38, 2017 CS, 2017 CO32, 2017 CN32, 2017 CG1, 2017 BL32, 2017 BL30, 2016 YU10, 2016 WU3, 2014 AD17, 10636
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-E97 -- 475665
160Castelmartini Obs. in Italy, 4 in MPEC 2017-E97 -- 53319, 484795, 137170, 7888
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPEC 2017-E97 -- 2017 EU, 2017 ES2, 2017 EO, 2017 EN, 2017 DV37, 2017 DT37, 2017 DS36, 2017 DQ15
K73Gravina Obs. in Italy, 2 in MPEC 2017-E97 -- 11398, 5604
J95Great Shefford Obs. in England, 1 in MPEC 2017-E97 -- 2017 EE3
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-E97 -- 2017 CS
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2017-E97 -- 163693
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPEC 2017-E97 -- 2017 EU, 2017 DR15, 2017 BU31, 2016 YU10, 2016 UE101, 2014 AD17, 99935, 90075, 452389, 347813, 250620, 136635
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-E97 -- 5604
926Tenagra II Obs. in Arizona, 9 in MPEC 2017-E97 -- 2017 EK, 2017 EC, 2017 DR15, 2017 DC36, 90075, 370702, 345646, 142561, 138155
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2017-E97 -- 2017 BD6, 2016 TB18, 2016 HN
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 March '17

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





Notes for Today's Latest Risk Assessments
2017 BD6JPL Sentry1607R E M O V E DJPL: Risk listing removed at 1503 UTC.
2016 VC18NEODyS1607R E M O V E D-

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 14 March '17

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

1842Generated Traffic Report
1607Noted that NEODyS has removed 2016 VC18 as an impact risk - see above
Noted that JPL Sentry has removed 2017 BD6 as an impact risk - see above
Grabbed MPEC 2017-E97 - Daily Orbit Update - see above