Contents  on 25 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 25 March '17

Eight objects reported inside ten LD

There are eight asteroids known to be within ten lunar distances (LD) of our planet today. The two nearest are both outbound NHATS targets. Risk-listed 2017 FZ2 heads away from 2.75 to 4.39 LD and 2017 FJ3 from 2.77 to 2.99 LD.

Earth passage I D ~Size Distance Today  Notes
0.33 LD March 202017 FM1 4 m  9.27 to 11.55 LD exits ten LD, intruder
1.70 LD March 232017 FZ2 16 m  2.75 to 4.39 LD NHATS target, risk - DOU
1.98 LD March 212017 FJ 8 m  7.27 to 9.28 LD NHATS target
2.57 LD March 222017 FJ3 4 m  2.77 to 2.99 LD NHATS target
4.19 LD tomorrow2017 FL63 21 m  5.64 from 8.76 LD DOU
5.75 LD March 272017 FF3 15 m  5.79 from 5.91 LD NHATS target - DOU
7.63 LD tomorrow2015 TC25 4 m  7.64 from 7.72 LD radar/NHATS target, risk
9.06 LD March 272017 FK3 20 m  9.80 from 10.73 LD enters ten LD - DOU
Approaching
3.8   LD April 62017 FU64 62 m  < 10 LD April 4, uncertainty +/- 32 mins., risk
4.57 LD April 192014 JO25 812 m  < 10 LD April 18, radar target
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU
9.01 LD April 22017 FV 47 m  < 10 LD March 31, radar target, risk - DOU

This report was generated at 2041 UTC with follow-up in today's DOU MPEC for six objects in the traffic table here plus five departed objects: risk-listed 2017 FA3 and NHATS targets 2017 FR63, 2017 FQ63, 2017 FR, and 2017 DC36, as well as distant 2017 FB3.



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. "Distant" is used here to describe an object that has come within ten LD in the ten-plus years A/CC has done traffic reporting, but is not presently so close. 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 25 March '17

The MPC's NEO Confirmation Page has 85 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 85 objects listed. Of these, 38 were "one nighters." So far The Tracking News has counted a total of 93 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 25 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 25 Mar. '17 >>  MPEC 2017-F121 - "12:05 UT" - Daily Orbit Update

Observers  on 25 March '17

A total of 20 observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2017-F121 -- 2017 FX, 2017 EX2, 2017 EU, 2017 EH4, 2017 DO35, 2017 DC36, 2017 CS, 2017 CN32, 2003 WW87, 277473, 276732
T05ATLAS Haleakala in Hawaii, 7 in MPEC 2017-F121 -- 2017 CR32, 90075, 143404, 138155, 5626, 5604, 4055
T08ATLAS Mauna Loa in Hawaii, 6 in MPEC 2017-F121 -- 2006 UM, 485652, 11398, 10636, 4179, 3103
703Catalina Sky Survey (CSS) in Arizona, 24 in MPEC 2017-F121 -- 2017 FQ63, 2017 EN, 2017 EC, 2017 DC38, 2017 CS, 2011 ED78, 2003 FR6, 90075, 480934, 475665, 405427, 381906, 374038, 370702, 274138, 250620, 190166, 162882, 154144, 138155, 5626, 5604, 4954, 3552
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 5 in MPEC 2017-F121 -- 2017 FV, 2017 FO63, 2017 FC3, 2017 FB1, 484506
J95Great Shefford Obs. in England, 3 in MPEC 2017-F121 -- 2017 FX64, 2017 FL63, 2017 FC1
Z87Laver Obs. in England, 1 in MPEC 2017-F121 -- 143404
932McCarthy Obs. in Connecticut, 2 in MPEC 2017-F121 -- 2017 FZ2, 2017 FQ63
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2017-F121 -- 4179
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-F121 -- 2017 FL63
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPEC 2017-F121 -- 2017 EB3, 2012 EY11, 2011 ED78, 481904, 326946
W25RMS Obs., 5 in MPEC 2017-F121 -- 2017 FL1, 2017 FC1, 2017 DC38, 2017 AC5, 370702
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-F121 -- 2017 ES2
W887program code 7 via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-F121 -- 2017 CS
Y00SONEAR in Brazil, 1 in MPEC 2017-F121 -- 22771
691Spacewatch 0.9m telescope in Arizona, 15 in MPEC 2017-F121 -- 2017 FX2, 2017 FE1, 2017 FB3, 2017 EY2, 2017 EJ3, 2017 DC109, 2017 DA109, 2016 QC84, 2012 EC, 2010 VE1, 2010 GA7, 2009 FF19, 2004 JR, 2000 JA3, 143404
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2017-F121 -- 2017 DS35, 2017 DB38, 2017 CM32, 2012 EY11, 2007 TG25, 462550
I52Steward Obs. Mt. Lemmon Station in Arizona, 20 in MPEC 2017-F121 -- 2017 FX2, 2017 FT, 2017 FR63, 2017 FQ63, 2017 FP63, 2017 FO63, 2017 FL63, 2017 FK63, 2017 FK3, 2017 FJ1, 2017 FH63, 2017 FH3, 2017 FH, 2017 FF3, 2017 FE1, 2017 FA1, 2017 ES22, 2017 EG4, 2017 EE23, 2017 DQ37
926Tenagra II Obs. in Arizona, 10 in MPEC 2017-F121 -- 2017 FZ2, 2017 FT, 2017 FR63, 2017 FP, 2017 FO63, 2017 FL63, 2017 FK3, 2017 FH3, 2017 ES2, 2016 WO1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 7 in MPEC 2017-F121 -- 2017 FV, 2017 FR, 2017 FE1, 2017 FC3, 2017 FC1, 2017 FA3, 364136
C51WISE in Earth polar orbit, 3 in MPEC 2017-F121 -- 2016 WF9, 2013 EW27, 2003 AF23
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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 FO63JPL Sentry16002097-210431.1e-06-5.00-5.170JPL: "Analysis based on 33 observations spanning 3.8386 days (2017-Mar-21.38988 to 2017-Mar-25.22853)." Diameter approximately 0.068 km. from mean, weighted H=23.5.
2017 FC3JPL Sentry16302043-2061225.4e-06-4.31-4.670JPL: "Analysis based on 17 observations spanning 5.6018 days (2017-Mar-19.32518 to 2017-Mar-24.926981)." Diameter approximately 0.067 km. from mean, weighted H=23.5.
2017 FA3JPL Sentry1630211614.2e-09-10.14-10.10JPL: "Analysis based on 22 observations spanning 5.0631 days (2017-Mar-19.34252 to 2017-Mar-24.405646)." Diameter approximately 0.008 km. from mean, weighted H=28.1.
2017 FZ2JPL Sentry16302101-210432.0e-06-6.84-6.870JPL: "Analysis based on 149 observations spanning 4.9481 days (2017-Mar-19.34252 to 2017-Mar-24.290593)." Diameter approximately 0.016 km. from mean, weighted H=26.7.
2017 FE1JPL Sentry1630R E M O V E DJPL: Risk listing removed at 1610 UTC.
2017 FC1JPL Sentry1630206414.6e-07-6.86-6.860JPL: "Analysis based on 55 observations spanning 10.575 days (2017-Mar-14.415078 to 2017-Mar-24.98971)." Diameter approximately 0.022 km. from mean, weighted H=25.9.
2017 FB1JPL Sentry16302101-2117121.7e-06-4.92-5.200JPL: "Analysis based on 33 observations spanning 6.6823 days (2017-Mar-18.20739 to 2017-Mar-24.889738)." Diameter approximately 0.074 km. from mean, weighted H=23.3.
2017 FVJPL Sentry16002099-211579.0e-07-5.99-6.520JPL: "Analysis based on 33 observations spanning 7.6431 days (2017-Mar-17.26524 to 2017-Mar-24.908381)." Diameter approximately 0.042 km. from mean, weighted H=24.6.

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 25 March '17

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

2041Generated Traffic Report
1630Noted that JPL Sentry has updated its 2017 FA3 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FB1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FC1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FC3 risk assessment - see above
Noted that JPL Sentry has removed 2017 FE1 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 FZ2 risk assessment - see above
1600Noted that JPL Sentry has updated its 2017 FO63 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FV risk assessment - see above
Grabbed MPEC 2017-F121 - Daily Orbit Update - see above