Contents  on 17 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 17 March '17

Five objects reported inside ten LD

There are five visitors reported traveling less than ten lunar distances (LD) from Earth today. NHATS target 2017 EG3 is the nearest, and comes its closest to our planet on this passage -- 4.38 LD at 1056 UTC.

Earth passage I D ~Size Distance Today  Notes
4.38 LD today2017 EG3 18 m  4.38 LD NHATS target, Earth closest at 1056 UTC
4.95 LD March 132017 EK 49 m  9.90 to 12.44 LD exits ten LD
7.04 LD yesterday2017 EE4 36 m  7.31 to 8.47 LD
7.63 LD March 262015 TC25 4 m  9.84 from 10.30 LD enters ten LD, radar/NHATS target, risk
8.34 LD yesterday1998 SL36 309 m  8.47 to 9.62 LD radar target
Approaching
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

This report was generated at 1714 UTC with follow-up in today's DOU MPEC for departed NHATS target 2017 CF32, extending its observing arc by 8.78 days to 29.83 total, and with observation from December of very dim, risk-listed NHATS target 2016 RD34, adding 23.01 days to its previous 78.88-day arc.



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 17 March '17

The MPC's NEO Confirmation Page has 54 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 54 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 60 listings on the NEOCP today.

New MPECs  on 17 March '17

Minor Planet Electronic Circulars

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


<< DOU on 17 Mar. '17 >>  MPEC 2017-F11 - "12:03 UT" - Daily Orbit Update


MPEC 2017-F10 - "11:14 UT" - 2017 EP22


MPEC 2017-F09 - "11:12 UT" - 2017 ET22


MPEC 2017-F08 - "11:09 UT" - 2017 ES22


MPEC 2017-F07 - "11:06 UT" - 2017 ER22


MPEC 2017-F06 - "11:02 UT" - 2017 EO22


MPEC 2017-F05 - "10:39 UT" - 2008 HH

Observers  on 17 March '17

A total of 36 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-F10 -- 2017 EP22
H21Astronomical Research Obs. Westfield in Illinois, 29 in MPECs 2017-F07, 2017-F08, 2017-F09 & 2017-F11 -- 2017 ET22, 2017 ET2, 2017 ES22, 2017 ER22, 2017 DO109, 2017 DM109, 2017 DJ34, 2017 DB38, 2017 CR32, 2017 CF32, 2017 BO3, 2017 BF30, 2016 YV8, 2014 DJ112, 2013 DQ9, 2013 CT36, 2006 UM, 2006 EC1, 90075, 89830, 40267, 22771, 141018, 11398, 5604, 4954, 3103, 2329, 1864
T05ATLAS Haleakala in Hawaii, 9 in MPEC 2017-F11 -- 90075, 388838, 370307, 175189, 143404, 10636, 5604, 4055, 2329
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2017-F11 -- 90075, 250620, 143404, 10636, 5626, 5604, 4954, 1036
R58Beverly-Begg Obs., 1 in MPEC 2017-F11 -- 5604
160Castelmartini Obs. in Italy, 2 in MPEC 2017-F11 -- 2016 RP33, 2016 LZ10
107Cavezzo Obs. in Italy, 1 in MPEC 2017-F11 -- 5604
K51Celado Obs. in Italy, 3 in MPECs 2017-F06, 2017-F07 & 2017-F09 -- 2017 ET22, 2017 ER22, 2017 EO22
006Fabra Obs. in Spain, 3 in MPEC 2017-F11 -- 11398, 10636, 5604
K73Gravina Obs. in Italy, 2 in MPEC 2017-F11 -- 11398, 5604
J95Great Shefford Obs. in England, 1 in MPEC 2017-F09 -- 2017 ET22
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPECs 2017-F06 & 2017-F10 -- 2017 EP22, 2017 EO22
246KLENOT in the Czech Republic, 1 in MPEC 2017-F11 -- 2017 BL30
V37LCOGT Fort Davis in Texas, 2 in MPECs 2017-F08 & 2017-F09 -- 2017 ET22, 2017 ES22
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2017-F06, 2017-F08 & 2017-F10 -- 2017 ES22, 2017 EP22, 2017 EO22
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2017-F05 -- 2008 HH
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2017-F11 -- 2017 EC, 2016 QC84
G96Mt. Lemmon Survey (MLS) in Arizona, 24 in MPECs 2017-F06, 2017-F09, 2017-F10 & 2017-F11 -- 2017 ET22, 2017 EP22, 2017 EO22, 2017 EH4, 2017 EH1, 2017 AC5, 2016 QC84, 2015 BE513, 2006 UM, 2003 XV10, 85804, 481032, 474451, 471240, 385186, 374038, 198752, 175189, 162063, 143404, 5626, 5324, 4055, 3552
C47Nonndorf Obs. in Austria, 1 in MPEC 2017-F07 -- 2017 ER22
Z80Northolt Branch Obs. in England, 3 in MPEC 2017-F11 -- 2017 CR32, 2006 EC1, 163693
G34Oberfrauendorf Obs. in Germany, 3 in MPEC 2017-F11 -- 485652, 10636, 5604
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-F11 -- 5604
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2017-F07, 2017-F08, 2017-F09 & 2017-F11 -- 2017 ET22, 2017 ES22, 2017 ER22, 2017 CO32, 2017 CG1, 2007 GW4, 2006 UM, 486607, 193178, 3199
D29Purple Mtn. Obs. Xuyi Station in China, 5 in MPEC 2017-F11 -- 388838, 317255, 143404, 10636, 5189
W25RMS Obs., 8 in MPEC 2017-F11 -- 2017 EX2, 2017 CH1, 2017 AC5, 370702, 345646, 20255, 154652, 138155
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-F07 & 2017-F08 -- 2017 ES22, 2017 ER22
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-F09 -- 2017 ET22
587Sormano Obs. in Italy, 3 in MPECs 2017-F07, 2017-F09 & 2017-F10 -- 2017 ET22, 2017 ER22, 2017 EP22
691Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2017-F11 -- 2017 EX2, 2017 EL, 2017 ED4, 2017 DC38, 2017 CN32, 2017 AC5, 2015 BY310, 2012 RG3, 2000 EM26
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2017-F07, 2017-F08, 2017-F09, 2017-F10 & 2017-F11 -- 2017 ET22, 2017 ES22, 2017 ER22, 2017 EP22, 2017 EG4, 2017 DS35, 2017 DQ36
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-F11 -- 5604
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-F11 -- 483459
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2017-F08, 2017-F09 & 2017-F10 -- 2017 ET22, 2017 ES22, 2017 EP22
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPECs 2017-F07 & 2017-F08 -- 2017 ES22, 2017 ER22
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-F07 -- 2017 ER22
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2017-F05 & 2017-F11 -- 2016 RD34, 2008 HH
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 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 ET2JPL Sentry1548211212.0e-08-8.44-8.440JPL: "Analysis based on 19 observations spanning 10.987 days (2017-Mar-05.34237 to 2017-Mar-16.32922)." Diameter approximately 0.023 km. from mean, weighted H=25.9.
2016 RD34JPL Sentry21112051-2092253.4e-03-3.97-4.160JPL #2 for the day: "Analysis based on 80 observations spanning 101.90 days (2016-Sep-11.42997 to 2016-Dec-22.325591)." Diameter approximately 0.011 km. from mean, weighted H=27.5.

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 17 March '17

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

2111Noted that JPL Sentry has updated its 2016 RD34 risk assessment - see above
1714Generated Traffic Report
1548Noted that JPL Sentry has updated its 2016 RD34 risk assessment - see above
Noted that JPL Sentry has updated its 2017 ET2 risk assessment - see above
Grabbed MPEC 2017-F05 - 2008 HH - see above
Grabbed MPEC 2017-F06 - 2017 EO22 - see above
Grabbed MPEC 2017-F07 - 2017 ER22 - see above
Grabbed MPEC 2017-F08 - 2017 ES22 - see above
Grabbed MPEC 2017-F09 - 2017 ET22 - see above
Grabbed MPEC 2017-F10 - 2017 EP22 - see above
Grabbed MPEC 2017-F11 - Daily Orbit Update - see above