Contents  on 9 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 9 March '17

Eight objects reported inside ten LD

Today eight minor objects are known to be transiting our traffic reporting "bubble" with a radius of ten lunar distances (LD) from Earth's center. NHATS target 2017 DA36 is the nearest, moving in from 5.09 to 4.31 LD.

Earth passage I D ~Size Distance Today  Notes
0.92 LD March 52017 DS109 21 m  8.68 to 11.22 LD exits ten LD, intruder
2.78 LD March 52017 EV 15 m  6.69 to 8.47 LD NHATS target
4.05 LD tomorrow2017 DA36 32 m  4.31 from 5.09 LD NHATS target - DOU
4.42 LD March 32017 EG1 11 m  8.97 to 10.18 LD exits ten LD
4.48 LD March 72017 EW 13 m  5.82 to 7.76 LD
5.35 LD March 22017 ED 18 m  9.02 to 9.94 LD NHATS target - DOU
7.43 LD March 72017 EF 13 m  8.28 to 9.42 LD
9.65 LD yesterday2017 DV35 12 m  9.65 to 9.71 LD NHATS target

This report was generated at 1841 UTC noting follow-up in today's DOU MPEC for three nearby objects (see tables) and departed NHATS target 2017 DC36, plus astrometry from early February for risk-listed 2017 AP4.

Approaching (sorted by 10-LD bubble entry date)
4.95 LD March 132017 EK 54 m  < 10 LD tomorrow - DOU
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 434 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. 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 9 March '17

The MPC's NEO Confirmation Page has 123 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 123 objects listed. Of these, 30 were "one nighters." So far The Tracking News has counted a total of 125 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 9 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 9 Mar. '17 >>  MPEC 2017-E60 - "13:06 UT" - Daily Orbit Update

Observers  on 9 March '17

Nineteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPEC 2017-E60 -- 2017 EK, 2017 DC36, 2017 DA36, 2013 CJ89
T08ATLAS Mauna Loa in Hawaii, 3 in MPEC 2017-E60 -- 370307, 4954, 2329
160Castelmartini Obs. in Italy, 6 in MPEC 2017-E60 -- 2017 CR32, 443103, 347813, 11398, 5131, 3103
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2017-E60 -- 2017 EU, 2017 DY108, 2017 DR15, 2017 DE38, 2017 DC38
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-E60 -- 2017 DC36
108Montelupo Obs. in Italy, 3 in MPEC 2017-E60 -- 40267, 11398, 1036
G96Mt. Lemmon Survey (MLS) in Arizona, 15 in MPEC 2017-E60 -- 2017 DT15, 2017 BW32, 2017 BK92, 2016 UU80, 2016 TY92, 2013 YK148, 391275, 328059, 288914, 274138, 22099, 5836, 5626, 3552, 1221
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-E60 -- 163693
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2017-E60 -- 2017 AP20, 40267
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 3 in MPEC 2017-E60 -- 54789, 10636, 4179
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2017-E60 -- 326683, 154555, 152931
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-E60 -- 143404
Y00SONEAR in Brazil, 1 in MPEC 2017-E60 -- 7341
691Spacewatch 0.9m telescope in Arizona, 8 in MPEC 2017-E60 -- 2016 VV3, 2016 QC84, 2011 QP96, 2005 ES70, 2000 EM26, 1996 FS1, 443103, 190166
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2017-E60 -- 2017 DQ36, 2017 CW1, 2016 TK
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-E60 -- 347813
I52Steward Obs. Mt. Lemmon Station in Arizona, 9 in MPEC 2017-E60 -- 2017 EO, 2017 EM, 2017 EH1, 2017 ED, 2017 DZ108, 2017 DA36, 2017 CK1, 2017 BK92, 2016 YF11
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-E60 -- 2017 AP4
C51WISE in Earth polar orbit, 1 in MPEC 2017-E60 -- 2017 BA30
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 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 AP4NEODyS1654R 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 9 March '17

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

1841Generated Traffic Report
1654Noted that NEODyS has removed 2017 AP4 as an impact risk - see above
Grabbed MPEC 2017-E60 - Daily Orbit Update - see above