Contents  on 7 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 7 March '17

Nine objects reported inside ten LD

Today there are nine asteroidal objects known to be traveling within a radius of ten lunar distances (LD) from our planet. Nearest are 2017 EV, headed away from 3.59 to 5.02 LD, intruder 2017 DS109, outbound from 3.67 to 6.16 LD, and 2017 EW, which at 1356 UTC comes its closest to Earth this time around -- 4.48 LD.

Earth passage I D ~Size Distance Today  Notes
0.92 LD March 52017 DS109 21 m  3.67 to 6.16 LD intruder
2.17 LD March 32017 EJ1 10 m  8.48 to 10.54 LD exits ten LD, risk
2.78 LD March 52017 EV 15 m  3.59 to 5.02 LD
4.05 LD March 102017 DA36 32 m  6.20 from 7.50 LD NHATS target
4.42 LD March 32017 EG1 11 m  6.73 to 7.81 LD
4.48 LD today2017 EW 13 m  4.48 LD Earth closest at 1356 UTC - DOU
5.35 LD March 22017 ED 18 m  7.33 to 8.14 LD NHATS target
7.43 LD today2017 EF 13 m  7.43 LD Earth closest at 0659 UTC
9.65 LD tomorrow2017 DV35 12 m  9.66 from 9.73 LD NHATS target

This report was updated at 1842 UTC to revise these traffic tables and to note follow-up in today's DOU MPEC for three NHATS targets: departed 2017 DC36 and 2017 CF32 (also a radar target), and distant 2013 NJ (first follow-up to its late-January recovery, 37.81 days added to 0.02), plus astrometry from last month for NHATS/radar target 2017 BW and from last summer for risk-listed NHATS target 2016 NL39. Your first local small bodies traffic report was generated at 0540 UTC.

Approaching (sorted by 10-LD bubble entry date)
4.95 LD March 132017 EK 54 m  < 10 LD March 10
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 - 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 7 March '17

The MPC's NEO Confirmation Page has 93 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 93 objects listed. Of these, 49 were "one nighters." So far The Tracking News has counted a total of 99 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 7 March '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-E57 - "14:32 UT" - Comet C/2017 E2 (XuYi)


<< DOU on 7 Mar. '17 >>  MPEC 2017-E56 - "13:17 UT" - Daily Orbit Update

Observers  on 7 March '17

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPEC 2017-E56 -- 2016 YN13, 2016 PZ66
T05ATLAS Haleakala in Hawaii, 5 in MPEC 2017-E56 -- 2017 CR32, 2013 YK148, 2011 WO41, 2006 UM, 2006 EC1
T08ATLAS Mauna Loa in Hawaii, 15 in MPEC 2017-E56 -- 2017 AC5, 2011 WO41, 90075, 413002, 370702, 250620, 22771, 153951, 143404, 138155, 10636, 5626, 4055, 3552, 1036
073Bucharest Obs. in Romania, 1 in MPEC 2017-E56 -- 143404
160Castelmartini Obs. in Italy, 3 in MPEC 2017-E56 -- 2017 BW, 481457, 357024
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2017-E56 -- 2017 EU, 2017 EO, 2017 EM, 2017 DY108, 2017 DO109, 2012 EC
K65Cesena Obs. in Italy, 1 in MPEC 2017-E57 -- C/2017 E2
006Fabra Obs. in Spain, 5 in MPEC 2017-E56 -- 90075, 40267, 138155, 11398, 10636
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2017-E56 -- 2011 EP51
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2017-E56 -- 2011 EP51
V37LCOGT Fort Davis in Texas, 2 in MPEC 2017-E56 -- 2011 EP51, 265482
Q64LCOGT Siding Spring B in New South Wales, 1 in MPEC 2017-E56 -- 2011 EP51
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2017-E56 -- 2011 EP51
K92LCOGT Sutherland B in South Africa, 1 in MPEC 2017-E56 -- 2011 EP51
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-E56 -- 2011 EP51
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-E57 -- C/2017 E2
W33MPC code W33, 3 in MPEC 2017-E56 -- 40267, 11398, 3103
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2017-E56 & 2017-E57 -- 2017 ET, C/2017 E2, 482244, 173561, 137158
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2017-E56 -- 1999 TZ4, 40267
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPEC 2017-E56 -- 2017 EU, 2017 EH1, 2016 NL39, 2013 KY1, 2002 AN11, 2000 CE59, 363116, 173561, 162181
D29Purple Mtn. Obs. Xuyi Station in China, 7 in MPECs 2017-E56 & 2017-E57 -- C/2017 E2, 2011 WO41, 374038, 217807, 5626, 4055, 3552
W25RMS Obs., 1 in MPEC 2017-E56 -- 2017 EW
W881Tony Evans in Portugal via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-E56 -- 2017 DC36
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-E56 -- 2017 DT37
G45Space Surveillance Telescope Atom Site (SST Atom Site) in New Mexico, 34 in MPEC 2017-E56 -- 2017 DV37, 2017 DT37, 2017 DC36, 2017 CS, 2017 CG1, 2017 BU31, 2016 SD, 2014 EW24, 2009 BL2, 2003 CR1, 1994 JX, 90075, 85275, 53319, 480934, 479325, 437846, 370307, 25916, 249595, 190166, 162882, 162181, 153951, 138155, 137158, 136582, 7358, 4954, 4503, 3199, 3103, 2329, 1864
691Spacewatch 0.9m telescope in Arizona, 12 in MPECs 2017-E56 & 2017-E57 -- C/2017 E2, 2017 DS35, 2017 DM34, 2017 DE38, 2017 DA109, 2017 CS, 2017 CF32, 2017 BN3, 2017 AP20, 2016 LE9, 2012 RG3, 2010 HZ108
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2017-E56 -- 2017 DN109, 2017 BD29, 2016 XK, 2013 NJ, 2005 ES70
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-E57 -- C/2017 E2
Z52The Studios Obs., 2 in MPEC 2017-E56 -- 40267, 11398
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-E56 -- 2017 AQ19, 2014 NA64
C51WISE in Earth polar orbit, 2 in MPEC 2017-E56 -- 2017 DB109, 275611
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2017 EJ1NEODyS16202083-211292.1e-07-8.22-8.630NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2017-03-05.540 to 2017-03-06.519."
2016 NL39JPL Sentry16562055-2116834.1e-04-4.94-5.560JPL: "Analysis based on 72 observations spanning 27.975 days (2016-Jul-13.462934 to 2016-Aug-10.438324)." Diameter approximately 0.010 km. from mean, weighted H=27.6.

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 7 March '17

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

1842Updated Traffic Report
1656Noted that JPL Sentry has updated its 2016 NL39 risk assessment - see above
1620Noted that NEODyS has posted 2017 EJ1 as an impact risk - see above
Grabbed MPEC 2017-E56 - Daily Orbit Update - see above
Grabbed MPEC 2017-E57 - Comet C/2017 E2 (XuYi) - see above