Contents  on 15 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 15 March '17

Six objects reported inside ten LD

There are six asteroids reported moving inside ten lunar distances (LD) of our planet today. Nearest are NHATS target 2017 EG3, inbound from 6.32 to 5.15 LD, and 2017 EK, outbound from 5.74 to 7.58 LD.

Earth passage I D ~Size Distance Today  Notes
4.04 LD March 102017 DA36 32 m  7.73 to 9.15 LD NHATS target
4.38 LD March 172017 EG3 18 m  5.15 from 6.32 LD NHATS target
4.96 LD March 132017 EK 49 m  5.74 to 7.58 LD
7.04 LD tomorrow2017 EE4 35 m  7.08 from 7.85 LD DOU
7.77 LD March 112017 EE3 22 m  9.83 to 11.11 LD exits ten LD
8.34 LD tomorrow1998 SL36 309 m  8.55 from 9.84 LD radar target

This report was generated at 1736 UTC with follow-up in today's DOU MPEC for 2017 EE4 along with astrometry from February for NHATS target 2017 BY and from last November for risk-listed, Moon-buzzing NHATS target 2016 WY.

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

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. "Moon buzzing" is used here to describe an object that passed the Moon at less than one Earth-Moon lunar distance but didn't intrude into the Earth-Moon system during this passage. 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 15 March '17

The MPC's NEO Confirmation Page has 35 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 35 objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 40 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 15 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 15 Mar. '17 >>  MPEC 2017-E98 - "12:03 UT" - Daily Orbit Update

Observers  on 15 March '17

Nineteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 21 in MPEC 2017-E98 -- 2017 DS35, 2017 DD38, 2017 CN1, 2017 CJ1, 2017 BY, 2017 BX6, 2017 BW32, 2017 BU31, 2017 BL6, 2017 BL30, 2017 BK92, 2017 BH3, 2017 AC5, 2016 YR8, 2016 YM1, 2016 XD1, 2016 VR1, 2015 UM67, 68346, 161995, 10636
T05ATLAS Haleakala in Hawaii, 5 in MPEC 2017-E98 -- 484795, 40267, 250620, 10636, 4179
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2017-E98 -- 484795, 40267
160Castelmartini Obs. in Italy, 6 in MPEC 2017-E98 -- 96590, 54789, 347813, 12538, 5653, 5131
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2017-E98 -- 10636
I114Joseph Masiero in southern California via Gemini South Obs. in Chile, 1 in MPEC 2017-E98 -- 2010 XP69
511Haute Provence Obs. in Germany, 1 in MPEC 2017-E98 -- 2017 CR32
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 7 in MPEC 2017-E98 -- 2017 EW2, 2017 DN109, 2017 BR31, 2017 BN123, 2017 BM6, 2017 AM4, 2016 PR8
J69North Obs. in England, 1 in MPEC 2017-E98 -- 11398
Z80Northolt Branch Obs. in England, 2 in MPEC 2017-E98 -- 2017 AC5, 138155
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2017-E98 -- 2014 MP41, 2013 GL8, 408792, 10636
D29Purple Mtn. Obs. Xuyi Station in China, 7 in MPEC 2017-E98 -- 2006 UM, 452389, 448003, 40267, 347813, 10150, 1627
G40!M. Kumrucu-Lohmiller in Massachusetts via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-E98 -- 2017 EC
Y00SONEAR in Brazil, 1 in MPEC 2017-E98 -- 5604
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2017-E98 -- 2017 EH, 2017 DQ36, 2017 DC38, 2016 XH2, 2016 WF9
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-E98 -- 5604
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-E98 -- 2017 EE4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-E98 -- 2016 WY, 2016 VM6
C51WISE in Earth polar orbit, 2 in MPEC 2017-E98 -- 484757, 275611
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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 ET2NEODyS2017211212.18e-09-9.36-9.360NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2017-03-05.343 to 2017-03-09.381."
2017 BK30NEODyS20172085-210644.99e-07-7.57-7.830NEODyS: "Based on 39 optical observations (of which 3 are rejected as outliers) from 2017-01-26.449 to 2017-02-04.013."
2017 BD6NEODyS20172083-209331.29e-08-9.84-10.180NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2017-01-26.387 to 2017-02-02.554."
2016 WYJPL Sentry20172092-2114101.0e-04-6.47-6.570JPL #2 for the day: "Analysis based on 31 observations spanning 9.9848 days (2016-Nov-19.26009 to 2016-Nov-29.244925)." Diameter approximately 0.005 km. from mean, weighted H=29.2.

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 15 March '17

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

2017Noted that JPL Sentry has updated its 2016 WY risk assessment - see above
Noted that NEODyS has updated its 2017 BD6 risk assessment - see above
Noted that NEODyS has updated its 2017 BK30 risk assessment - see above
Noted that NEODyS has updated its 2017 ET2 risk assessment - see above
1736Generated Traffic Report
1540Noted that JPL Sentry has updated its 2016 WY risk assessment - see above
Grabbed MPEC 2017-E98 - Daily Orbit Update - see above