Contents  on 19 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 19 April '17

Four objects reported inside ten LD

Four visitors are reported to be less than ten lunar distances (LD) from Earth today. The nearest of these, and by far the biggest show, is radar target 2014 JO25 (links), which comes its closest to our planet on this passage, reaching 4.57 LD at 1223 UTC. The Arecibo Observatory Planetary Radar Science Group (PRSG) has posted an image and animation of this large object from observation two days ago, calling it "peanut shaped."

Earth passage I D ~Size Distance Today  Notes
0.35 LD April 162017 HJ 11 m  9.24 to 12.59 LD exits ten LD, intruder, risk - DOU
1.05 LD April 32017 FT102 4 m  7.68 to 8.17 LD NHATS target
3.77 LD April 222017 HD 14 m  8.37 from 10.91 LD enters ten LD
4.57 LD today2014 JO25 812 m  4.57 LD radar target, Earth closest at 1223 UTC - DOU
Approaching
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU

This report was generated at 1716 UTC with observation in today's DOU MPEC for three objects active in the traffic table here, along with astrometry from last month for NHATS target 2017 FR63.



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 19 April '17

The MPC's NEO Confirmation Page has 55 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 55 objects listed. Of these, 20 were "one nighters." So far The Tracking News has counted a total of 59 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 19 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 19 Apr. '17 >>  MPEC 2017-H18 - "12:00 UT" - Daily Orbit Update

Observers  on 19 April '17

A total of 32 observers appear in today's MPEC.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 10 in MPEC 2017-H18 -- 2017 GT6, 2017 GQ4, 2017 GL4, 2017 FN64, 2017 FA65, 2016 PK66, 2015 BT515, 2014 MK6, 2014 LO14, 2014 JP25
H21Astronomical Research Obs. Westfield in Illinois, 27 in MPEC 2017-H18 -- 2017 GT5, 2017 GK4, 2017 FY, 2017 FX64, 2017 FS64, 2017 FS101, 2017 FQ128, 2017 FP91, 2017 FP64, 2017 FO91, 2017 FO2, 2017 FM128, 2017 FL90, 2017 FK90, 2017 FJ90, 2017 FH101, 2017 FF101, 2017 FE128, 2017 FE1, 2017 DT37, 2017 CS, 2017 AC5, 2011 GD68, 2008 KP, 2006 QA58, 2001 QM142, 248083
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2017-H18 -- 480934, 143404, 3199
T08ATLAS Mauna Loa in Hawaii, 5 in MPEC 2017-H18 -- 90075, 484795, 252091, 138359, 5604
160Castelmartini Obs. in Italy, 19 in MPEC 2017-H18 -- 2017 DT37, 2017 AC5, 2005 GB120, 90075, 54789, 53319, 484795, 475665, 448003, 427643, 395289, 141018, 138359, 7888, 5653, 5604, 3352, 1917, 1627
107Cavezzo Obs. in Italy, 1 in MPEC 2017-H18 -- 2017 FH101
A77Chante-Perdrix Obs. in France, 1 in MPEC 2017-H18 -- 2014 JO25
B92Chinon Obs. in France, 1 in MPEC 2017-H18 -- 143404
E10*program code "*" (19) via Faulkes Telescope South in New South Wales, 2 in MPEC 2017-H18 -- 2017 HJ, 215588
Q60ISON Siding Spring Obs. in New South Wales, 5 in MPEC 2017-H18 -- 276468, 222073, 190166, 142781, 4503
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-H18 -- 2014 JO25
W85LCOGT Cerro Tololo A in Chile, 2 in MPEC 2017-H18 -- 2011 EP51, 364136
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2017-H18 -- 2011 EP51
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2017-H18 -- 2011 EP51
V37LCOGT Fort Davis in Texas, 1 in MPEC 2017-H18 -- 364136
Q63LCOGT Siding Spring A in New South Wales, 1 in MPEC 2017-H18 -- 2011 EP51
Q64LCOGT Siding Spring B in New South Wales, 1 in MPEC 2017-H18 -- 2011 EP51
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2017-H18 -- 2011 EP51
K92LCOGT Sutherland B in South Africa, 2 in MPEC 2017-H18 -- 2011 EP51, 364136
K93LCOGT Sutherland C in South Africa, 2 in MPEC 2017-H18 -- 2011 EP51, 364136
474Mt. John Obs. in New Zealand, 10 in MPEC 2017-H18 -- 2017 GW6, 2017 GU6, 2017 GO7, 2017 GO6, 2017 GL7, 2017 FP63, 2017 FP102, 2017 FP101, 2017 DS36, 2017 BQ93
G96Mt. Lemmon Survey (MLS) in Arizona, 19 in MPEC 2017-H18 -- 2017 GV6, 2017 GT5, 2017 FS101, 2017 FO2, 2017 FG128, 2015 FF37, 2014 NZ64, 2009 FR30, 2007 PF28, 484795, 434734, 39565, 250614, 249595, 232382, 7358, 5693, 5653, 4179
J69North Obs. in England, 1 in MPEC 2017-H18 -- 2014 JO25
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-H18 -- 252091
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2017-H18 -- 2014 JO25
D29Purple Mtn. Obs. Xuyi Station in China, 12 in MPEC 2017-H18 -- 2017 GQ6, 2017 EN, 2016 VV3, 2005 GO59, 2000 UW13, 474425, 474231, 190758, 154652, 137158, 136582, 7474
Y00SONEAR in Brazil, 1 in MPEC 2017-H18 -- 484795
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2017-H18 -- 2016 VV3, 2016 UW80, 2010 SH15, 2010 LM14
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-H18 -- 2014 JO25
926Tenagra II Obs. in Arizona, 13 in MPEC 2017-H18 -- 2017 GW6, 2017 GV6, 2017 GT6, 2017 GM4, 2017 GG4, 2017 FS101, 2017 FM128, 2017 FJ90, 2017 FH128, 2017 FG128, 2016 UW80, 2014 JO25, 2005 GO59
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-H18 -- 2017 FR63
I15Wishing Star Obs. in Rhode Island, 4 in MPEC 2017-H18 -- 2017 GM4, 2017 GK4, 2017 FH101, 474231
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 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.
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 BF136JPL Sentry03352069-210532.4771e-09-8.97-9.140JPL: Computed at 18:15 April 18th Pacific time based on 14 observations spanning 1.0354 days (2017-Jan-31.33373 to 2017-Feb-01.36918). Diameter approximately 0.020 km. from weighted mean H=26.11.
2016 SU2JPL Sentry20062102-2115124.392043e-06-6.89-7.270JPL: Computed at 12:07 today Pacific time based on 29 observations spanning 7.0961 days (2016-Sep-26.27817 to 2016-Oct-03.374307). Diameter approximately 0.010 km. from weighted mean H=27.69.
2016 EV84JPL Sentry16402056-211782.79106e-06-6.62-6.840JPL: Computed at 07:38 today Pacific time based on 98 observations spanning 5.8816 days (2016-Mar-10.45216 to 2016-Mar-16.33377). Diameter approximately 0.015 km. from weighted mean H=26.77.
2015 DA54JPL Sentry20062107-210711.837e-08-5.67-5.670JPL: Computed at 12:04 today Pacific time based on 55 observations spanning 58.917 days (2015-Jan-26.363069 to 2015-Mar-26.279769). Diameter approximately 0.230 km. from weighted mean H=20.83.
443104 2013 XK22JPL Sentry05502101-210111.427e-06-5.82-5.820JPL: Computed at 22:01 April 18th Pacific time based on 99 observations spanning 958.62 days (2013-Dec-14.43128 to 2016-Jul-30.048786). Diameter approximately 0.050 km. from weighted mean H=24.16.
2004 XO63JPL Sentry05012065-206517.276e-08-7.76-7.760JPL: Computed at 21:46 April 18th Pacific time based on 39 observations spanning 5.9306 days (2004-Dec-15.18718 to 2004-Dec-21.11781). Diameter approximately 0.021 km. from weighted mean H=26.08.

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 19 April '17

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

2006Noted that JPL Sentry has updated its 2015 DA54 risk assessment - see above
Noted that JPL Sentry has updated its 2016 SU2 risk assessment - see above
1716Generated Traffic Report
1640Noted that JPL Sentry has updated its 2016 EV84 risk assessment - see above
Grabbed MPEC 2017-H18 - Daily Orbit Update - see above
0550Noted that JPL Sentry has updated its 443104 2013 XK22 risk assessment - see above
0501Noted that JPL Sentry has reposted 2004 XO63 as an impact risk - see above
0335Noted that JPL Sentry has updated its 2017 BF136 risk assessment - see above