Contents  on 17 April '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 April '17

One object reported inside ten LD

Today only one transient natural object is reported flying within a radius of ten lunar distances (LD) from Earth's center. NHATS target 2017 FT102 is outbound from 6.70 to 7.19 LD. Tomorrow radar target 2014 JO25 moves into the ten LD space, and radar target 2017 CS is on its way to come inside on May 26th.

This report was generated at 1640 UTC.

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 April '17

The MPC's NEO Confirmation Page has 56 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 56 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 62 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 17 April '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 17 Apr. '17 >>  MPEC 2017-H06 - "12:00 UT" - Daily Orbit Update

Observers  on 17 April '17

Nineteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2017-H06 -- 2017 FR101, 2017 FO91, 2017 FL91, 2017 DA109, 2017 CO32, 2017 CM32, 276732
T05ATLAS Haleakala in Hawaii, 10 in MPEC 2017-H06 -- 413002, 388838, 370307, 222073, 215588, 190166, 138404, 7341, 4954, 1864
T08ATLAS Mauna Loa in Hawaii, 7 in MPEC 2017-H06 -- 391508, 220124, 143404, 11398, 5653, 3103, 2329
160Castelmartini Obs. in Italy, 18 in MPEC 2017-H06 -- 2017 DT37, 2017 AC5, 90075, 53319, 484795, 475665, 388838, 252091, 220124, 143624, 138359, 137170, 137158, 106589, 7888, 5626, 3103, 2329
703Catalina Sky Survey (CSS) in Arizona, 12 in MPEC 2017-H06 -- 2010 JH88, 2005 GB120, 89830, 66400, 487577, 484517, 474425, 474179, 391508, 260141, 152931, 11398
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-H06 -- 2005 GB120
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-H06 -- 474231
Q60ISON Siding Spring Obs. in New South Wales, 2 in MPEC 2017-H06 -- 367684, 7358
Z43Landehen Obs., 1 in MPEC 2017-H06 -- 215588
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-H06 -- 252091
G96Mt. Lemmon Survey (MLS) in Arizona, 13 in MPEC 2017-H06 -- 2017 GM4, 2017 GK4, 2017 DT37, 485823, 412976, 405427, 391033, 388838, 215588, 175189, 162882, 5626, 5324
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPEC 2017-H06 -- 2017 FY, 2017 FS101, 2017 FE128, 2015 ME54, 2001 HW7, 1998 TT3, 65803, 190758, 154988, 138155, 4055
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2017-H06 -- 2017 DT37, 405427, 40267, 193178
Y00SONEAR in Brazil, 1 in MPEC 2017-H06 -- 1685
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2017-H06 -- 2017 FQ64, 2017 AP20, 2016 VV3
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2017-H06 -- 2016 YN13, 2016 RQ1
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-H06 -- 143404
926Tenagra II Obs. in Arizona, 3 in MPEC 2017-H06 -- 2017 FH101, 2017 DT37, 2017 DS35
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-H06 -- 2017 EB3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 April '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS 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 NASA/JPL Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2016 FF14JPL Sentry16002106-210618.801e-09-9.38-9.380JPL: Computed at 01:35 today Pacific time based on 82 observations spanning 4.1731 days (2016-Mar-31.28668 to 2016-Apr-04.45982). Diameter approximately 0.013 km. from weighted mean H=27.10.
2016 FY13JPL Sentry21072066-206611.236e-10-9.52-9.520JPL: Computed at 13:39 today Pacific time based on 13 observations spanning 1.9864 days (2016-Mar-30.24837 to 2016-Apr-01.23477). Diameter approximately 0.048 km. from weighted mean H=24.26.
2015 HW182JPL Sentry23012017-21161795.62791e-08-6.28-6.460JPL: Computed at 21:11 April 14th Pacific time based on 9 observations spanning .99990 days (2015-Apr-18.31077 to 2015-Apr-19.31067). Diameter approximately 0.031 km. from weighted mean H=25.20.
2014 WZ365JPL Sentry05302047-204712.831e-10-9.70-9.700JPL: Computed at 21:17 April 16th Pacific time based on 23 observations spanning 3.9974 days (2014-Nov-27.367456 to 2014-Dec-01.36484). Diameter approximately 0.025 km. from weighted mean H=25.70.
2012 DW60JPL Sentry16002083-2115160.00010498376-5.03-5.360JPL: Computed at 22:43 April 16th Pacific time based on 59 observations spanning 11.908 days (2012-Feb-29.49427 to 2012-Mar-12.4021) including radar (2 Doppler).. Diameter approximately 0.017 km. from weighted mean H=26.46.
2011 SR52JPL Sentry1600R E M O V E DJPL: Risk listing removed at 0546 UTC today.
2010 GV23JPL Sentry22002096-210527.334e-07-7.81-7.990JPL: Computed at 14:57 today Pacific time based on 63 observations spanning 6.9854 days (2010-Apr-09.21954 to 2010-Apr-16.20491). Diameter approximately 0.010 km. from weighted mean H=27.65.
2008 UC202JPL Sentry16002116-211632.40184e-06-7.69-7.740JPL: Computed at 07:22 today Pacific time based on 21 observations spanning 2.8555 days (2008-Oct-31.26043 to 2008-Nov-03.11597). Diameter approximately 0.008 km. from weighted mean H=28.24.
2007 WW3JPL Sentry23582031-210651.0804e-09-8.53-8.970JPL: Computed at 16:16 today Pacific time based on 14 observations spanning .11384 days (2007-Nov-19.35117 to 2007-Nov-19.46501). Diameter approximately 0.056 km. from weighted mean H=23.91.
2006 SCJPL Sentry18012053-210956.417751e-06-5.15-5.150JPL: Computed at 10:02 today Pacific time based on 102 observations spanning 27.157 days (2006-Sep-16.24646 to 2006-Oct-13.403084). Diameter approximately 0.031 km. from weighted mean H=25.20.
2004 DA53JPL Sentry23012111-211239.0117e-06-6.80-6.870JPL: Computed at 15:26 today Pacific time based on 17 observations spanning 1.6936 days (2004-Feb-26.2743 to 2004-Feb-27.96787). Diameter approximately 0.009 km. from weighted mean H=27.93.
2001 HJ31JPL Sentry23012116-211611.883e-07-6.38-6.380JPL: Computed at 15:19 today Pacific time based on 25 observations spanning 4.0436 days (2001-Apr-26.24716 to 2001-Apr-30.29076). Diameter approximately 0.063 km. from weighted mean H=23.65.

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 April '17

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

2358Noted that JPL Sentry has updated its 2007 WW3 risk assessment - see above
2301Noted that JPL Sentry has posted 2001 HJ31 as an impact risk - see above
Noted that JPL Sentry has updated its 2004 DA53 risk assessment - see above
Noted that JPL Sentry has updated its 2015 HW182 risk assessment - see above
2200Noted that JPL Sentry has updated its 2010 GV23 risk assessment - see above
2107Noted that JPL Sentry has posted 2016 FY13 as an impact risk - see above
1801Noted that JPL Sentry has updated its 2006 SC risk assessment - see above
1640Generated Traffic Report
1600Noted that JPL Sentry has posted 2008 UC202 as an impact risk - see above
Noted that JPL Sentry has removed 2011 SR52 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 DW60 risk assessment - see above
Noted that JPL Sentry has reposted 2016 FF14 as an impact risk - see above
Grabbed MPEC 2017-H06 - Daily Orbit Update - see above
0530Noted that JPL Sentry has updated its 2014 WZ365 risk assessment - see above