Contents  on 21 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 21 April '17

Short report only

There will be no regular traffic report today, as the data needed from the NASA/JPL Horizons ephemeris service was unavailable. Discoveries of three close passers were announced today: 2017 HH1 (MPEC), which will fly past Earth at 6.07 LD on April 23rd, and 2017 HL1 (MPEC) and 2017 HG1 (MPEC), which already went by on April 15th and 16th. Today's DOU MPEC has follow-up for 2017 HF, 2017 HE, 2017 HD, 2017 DC36, 2017 CS, and 2014 JO25, plus astrometry from March for risk-listed radar/NHATS target 2016 TB57.

This report was generated at 2341 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 21 April '17

The MPC's NEO Confirmation Page has 36 listings

When last checked at 2357 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 36 objects listed. Of these, 24 were "one nighters." So far The Tracking News has counted a total of 76 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 21 April '17

Minor Planet Electronic Circulars

As of last check at 2357 UTC, there have been twelve MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-H43 - "16:12 UT" - 2017 HW1


MPEC 2017-H42 - "14:55 UT" - Comet C/2017 G3 (Panstarrs)


MPEC 2017-H41 - "14:42 UT" - Comet P/2017 G2 (Panstarrs)


<< DOU on 21 Apr. '17 >>  MPEC 2017-H40 - "12:02 UT" - Daily Orbit Update


MPEC 2017-H39 - "11:34 UT" - 2017 HH1


MPEC 2017-H38 - "11:25 UT" - 2017 HF1


MPEC 2017-H37 - "11:22 UT" - 2017 HL1


MPEC 2017-H36 - "11:18 UT" - 2017 HK1


MPEC 2017-H35 - "11:15 UT" - 2017 HJ1


MPEC 2017-H34 - "11:11 UT" - 2017 HG1


MPEC 2017-H33 - "11:08 UT" - 2017 GD8


MPEC 2017-H32 - "11:04 UT" - 2017 GC8

Observers  on 21 April '17

A total of 51 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 24 in MPECs 2017-H38, 2017-H39 & 2017-H40 -- 2017 HH1, 2017 HF1, 2017 GM4, 2017 FS64, 2017 FS101, 2017 FR2, 2017 FQ128, 2017 FO128, 2017 FM128, 2017 FL91, 2017 FL90, 2017 FJ90, 2017 FH101, 2017 FE1, 2017 FD157, 2017 DC36, 2017 DB36, 2017 CS, 2013 YK148, 90075, 475665, 220124, 143404, 11398
T05ATLAS Haleakala in Hawaii, 14 in MPEC 2017-H40 -- 2016 PR8, 443103, 413002, 395289, 388838, 370307, 222073, 190166, 142781, 138404, 7341, 4954, 3199, 1864
T08ATLAS Mauna Loa in Hawaii, 5 in MPEC 2017-H40 -- 96590, 11398, 5653, 5131, 887
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-H41 -- P/2017 G2
160Castelmartini Obs. in Italy, 1 in MPEC 2017-H40 -- 2017 HB1
703Catalina Sky Survey (CSS) in Arizona, 17 in MPECs 2017-H40 & 2017-H42 -- C/2017 G3, 2014 KF91, 2011 GL44, 2000 AF205, 87024, 484795, 413002, 388838, 276468, 222073, 190166, 138404, 138095, 136897, 100926, 7341, 1864
K51Celado Obs. in Italy, 5 in MPECs 2017-H34, 2017-H35, 2017-H38, 2017-H39 & 2017-H42 -- 2017 HJ1, 2017 HH1, 2017 HG1, 2017 HF1, C/2017 G3
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2017-H40 -- 2016 WJ1
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2017-H32, 2017-H33, 2017-H37 & 2017-H43 -- 2017 HW1, 2017 HL1, 2017 GD8, 2017 GC8
K65Cesena Obs. in Italy, 1 in MPEC 2017-H42 -- C/2017 G3
B92Chinon Obs. in France, 1 in MPEC 2017-H40 -- 2014 JO25
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2017-H40 -- 215588
958Dax Obs. in France, 4 in MPECs 2017-H38, 2017-H39, 2017-H41 & 2017-H42 -- 2017 HH1, 2017 HF1, C/2017 G3, P/2017 G2
J95Great Shefford Obs. in England, 3 in MPECs 2017-H38, 2017-H41 & 2017-H42 -- 2017 HF1, C/2017 G3, P/2017 G2
A17Guidestar Obs. in Germany, 1 in MPEC 2017-H42 -- C/2017 G3
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-H40 -- 427643
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 2 in MPECs 2017-H41 & 2017-H42 -- C/2017 G3, P/2017 G2
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2017-H32 & 2017-H33 -- 2017 GD8, 2017 GC8
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2017-H41 -- P/2017 G2
K92LCOGT Sutherland B in South Africa, 1 in MPEC 2017-H43 -- 2017 HW1
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-H43 -- 2017 HW1
K38M57 Obs. in Italy, 1 in MPEC 2017-H42 -- C/2017 G3
C10Maisoncelles Obs. in France, 2 in MPECs 2017-H41 & 2017-H42 -- C/2017 G3, P/2017 G2
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-H40 -- 2017 GB8
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPECs 2017-H33 & 2017-H41 -- 2017 GD8, P/2017 G2
118Modra Obs. in Slovakia, 1 in MPEC 2017-H42 -- C/2017 G3
474Mt. John Obs. in New Zealand, 6 in MPECs 2017-H35, 2017-H40 & 2017-H43 -- 2017 HW1, 2017 HJ1, 2017 HF, 2017 FK128, 2013 JM7, 2010 LQ33
G96Mt. Lemmon Survey (MLS) in Arizona, 14 in MPECs 2017-H34, 2017-H35, 2017-H38, 2017-H39, 2017-H40 & 2017-H42 -- 2017 HJ1, 2017 HH1, 2017 HG1, 2017 HF1, 2017 GL4, C/2017 G3, 2017 FH101, 2006 UM, 484725, 475665, 408792, 226198, 2329, 1864
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-H40 -- 2014 JO25
C23Olmen Obs. in Belgium, 2 in MPEC 2017-H40 -- 2014 JO25, 143404
F51Pan-STARRS 1 (PS1) in Hawaii, 29 in MPECs 2017-H32, 2017-H33, 2017-H34, 2017-H35, 2017-H36, 2017-H37, 2017-H39, 2017-H40, 2017-H41 & 2017-H42 -- 2017 HL1, 2017 HK1, 2017 HJ1, 2017 HH1, 2017 HG1, 2017 GT6, 2017 GT5, 2017 GQ4, 2017 GD8, 2017 GC8, C/2017 G3, P/2017 G2, 2017 FS101, 2017 FR64, 2017 FK128, 2011 FC29, 2009 JK1, 2009 FR30, 1999 VQ6, 1998 HK1, 65803, 427643, 363305, 31345, 243298, 163760, 162452, 142561, 2059
K63Pascoli Obs. in Italy, 2 in MPECs 2017-H40 & 2017-H42 -- C/2017 G3, 2014 JO25
B49Paus Obs. in Spain, 1 in MPEC 2017-H40 -- 2014 JO25
W25RMS Obs., 5 in MPECs 2017-H40 & 2017-H42 -- 2017 GW6, 2017 GB8, C/2017 G3, 2014 JO25, 276468
104San Marcello Pistoiese Obs. in Italy, 4 in MPECs 2017-H34, 2017-H38, 2017-H39 & 2017-H42 -- 2017 HH1, 2017 HG1, 2017 HF1, C/2017 G3
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-H38 -- 2017 HF1
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-H42 -- C/2017 G3
510Siegen Obs. in Germany, 1 in MPEC 2017-H40 -- 2014 JO25
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-H42 -- C/2017 G3
691Spacewatch 0.9m telescope in Arizona, 10 in MPECs 2017-H32, 2017-H33, 2017-H34, 2017-H35, 2017-H36, 2017-H40 & 2017-H42 -- 2017 HK1, 2017 HJ1, 2017 HG1, 2017 GD8, 2017 GC8, C/2017 G3, 2017 FE128, 2017 DC109, 2017 AP20, 411280
291Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2017-H32, 2017-H33, 2017-H40 & 2017-H41 -- 2017 GM7, 2017 GD8, 2017 GC8, P/2017 G2, 2017 FO128, 2017 FN128, 2017 FD157, 2017 AQ20, 2016 TB18, 2016 PR8, 2014 JG78, 2011 ST232, 2004 JQ1
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-H40 -- 2014 JO25
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2017-H40 -- 2014 JO25, 252091
I93St. Pardon de Conques Obs. in France, 7 in MPECs 2017-H34, 2017-H36, 2017-H37, 2017-H38, 2017-H39, 2017-H41 & 2017-H42 -- 2017 HL1, 2017 HK1, 2017 HH1, 2017 HG1, 2017 HF1, C/2017 G3, P/2017 G2
I52Steward Obs. Mt. Lemmon Station in Arizona, 22 in MPECs 2017-H33, 2017-H34, 2017-H35, 2017-H38, 2017-H40 & 2017-H41 -- 2017 HJ1, 2017 HG1, 2017 HF1, 2017 HE, 2017 HD, 2017 GS6, 2017 GS5, 2017 GS4, 2017 GP6, 2017 GO4, 2017 GM7, 2017 GM4, 2017 GD8, P/2017 G2, 2017 FW64, 2017 FO90, 2017 FM63, 2017 FH90, 2017 FC157, 2017 EW2, 2016 JP, 2013 JM7
A71Stixendorf Obs. in Austria, 1 in MPEC 2017-H41 -- P/2017 G2
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-H42 -- C/2017 G3
926Tenagra II Obs. in Arizona, 3 in MPECs 2017-H33, 2017-H41 & 2017-H42 -- 2017 GD8, C/2017 G3, P/2017 G2
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 10 in MPEC 2017-H40 -- 2017 GP6, 2017 GM7, 2017 GM6, 2017 FN128, 2017 FH3, 2017 FD157, 2016 TB57, 2016 FY2, 2014 JO25, 192559
K17Valentines Obs., 1 in MPEC 2017-H40 -- 2014 JO25
C51WISE in Earth polar orbit, 1 in MPEC 2017-H43 -- 2017 HW1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 April '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2357 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 HJNEODyS23082058-2117477.04e-06-6.42-7.290NEODyS: "Based on 40 optical observations (of which 1 are rejected as outliers) from 2017-04-17.426 to 2017-04-18.598."
2017 GM7JPL Sentry23082076-207612.663e-09-5.37-5.370JPL:
NEODyS2308207617.98e-10-5.90-5.90NEODyS: "Based on 38 optical observations (of which 1 are rejected as outliers) from 2017-04-07.257 to 2017-04-21.382."
2017 GP6JPL Sentry2308R E M O V E DJPL: Risk listing removed at 1546 UTC today.
2017 GM6JPL Sentry23082111-211322.756e-07-7.53-7.760JPL: Computed at 08:35 today Pacific time based on 32 observations spanning 15.122 days (2017-Apr-05.34221 to 2017-Apr-20.46391). Diameter approximately 0.022 km. from weighted mean H=25.98.
2017 FD157NEODyS2308204211.63e-10-8.16-8.160NEODyS #2 for the day
2017 FO128JPL Sentry23082104-210942.93861e-06-4.46-4.500JPL:
NEODyS23082104-211568.45e-07-5.01-5.270NEODyS: "Based on 68 optical observations (of which 2 are rejected as outliers) from 2017-03-30.263 to 2017-04-21.456."
2017 FN128JPL Sentry23082064-206412.736e-10-6.10-6.100JPL:
NEODyS2308206411.73e-11-7.30-7.30NEODyS: "Based on 59 optical observations (of which 0 are rejected as outliers) from 2017-03-27.304 to 2017-04-21.183."
2017 FL64JPL Sentry2308R E M O V E DJPL:
NEODyS1531R E M O V E D-
2016 WJ1NEODyS23082104-211686.22e-07-4.63-5.160NEODyS: "Based on 383 optical observations (of which 3 are rejected as outliers) from 2003-07-04.606 to 2017-04-05.394."
2016 TB57NEODyS23082099-211565.25e-08-8.37-8.460NEODyS: "Based on 139 optical observations (of which 2 are rejected as outliers) from 2016-09-12.527 to 2017-04-01.366."
2016 MH3JPL Sentry23082104-210425.436e-10-10.71-10.80JPL: Computed at 20:45 April 20th Pacific time based on 14 observations spanning .13171 days (2016-Jun-16.31796 to 2016-Jun-16.44967). Diameter approximately 0.013 km. from weighted mean H=27.08.
2014 XM7JPL Sentry23082115-211513.776e-08-6.72-6.720JPL: Computed at 10:25 today Pacific time based on 49 observations spanning 43.798 days (2014-Nov-16.412948 to 2014-Dec-30.210874). Diameter approximately 0.089 km. from weighted mean H=22.90.
2014 CH13JPL Sentry23082019-21161351.512793e-07-6.07-6.250JPL: Computed at 23:36 April 20th Pacific time based on 16 observations spanning .96308 days (2014-Feb-10.36764 to 2014-Feb-11.33072). Diameter approximately 0.047 km. from weighted mean H=24.28.
2012 UE34JPL Sentry23082116-211612.730e-07-6.15-6.150JPL: Computed at 02:56 today Pacific time based on 48 observations spanning 259.88 days (2012-Oct-18.39351 to 2013-Jul-05.269179). Diameter approximately 0.080 km. from weighted mean H=23.13.
2010 YDJPL Sentry23082091-209117.949e-08-8.13-8.130JPL: Computed at 19:12 April 20th Pacific time based on 44 observations spanning 10.136 days (2010-Dec-25.37287 to 2011-Jan-04.50918). Diameter approximately 0.016 km. from weighted mean H=26.61.
2006 UC64JPL Sentry23082069-208548.66517e-08-6.89-7.210JPL: Computed at 23:49 April 20th Pacific time based on 28 observations spanning 3.7362 days (2006-Oct-23.21635 to 2006-Oct-26.95252). Diameter approximately 0.034 km. from weighted mean H=24.98.
2005 EL70JPL Sentry23082034-203411.265e-07-5.40-5.400JPL: Computed at 16:11 April 20th Pacific time based on 18 observations spanning 2.0105 days (2005-Mar-08.3058 to 2005-Mar-10.31634). Diameter approximately 0.052 km. from weighted mean H=24.07.

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 21 April '17

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

2341Generated Traffic Report
2308Noted that JPL Sentry has reposted 2005 EL70 as an impact risk - see above
Noted that JPL Sentry has reposted 2006 UC64 as an impact risk - see above
Noted that JPL Sentry has reposted 2010 YD as an impact risk - see above
Noted that JPL Sentry has reposted 2012 UE34 as an impact risk - see above
Noted that JPL Sentry has posted 2014 CH13 as an impact risk - see above
Noted that JPL Sentry has reposted 2014 XM7 as an impact risk - see above
Noted that JPL Sentry has posted 2016 MH3 as an impact risk - see above
Noted that NEODyS has updated its 2016 TB57 risk assessment - see above
Noted that NEODyS has updated its 2016 WJ1 risk assessment - see above
Noted that NEODyS has reposted 2017 FD157 as an impact risk - see above
Noted that JPL Sentry has removed 2017 FL64 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 FN128 risk assessment - see above
Noted that NEODyS has updated its 2017 FN128 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FO128 risk assessment - see above
Noted that NEODyS has updated its 2017 FO128 risk assessment - see above
Noted that JPL Sentry has updated its 2017 GM6 risk assessment - see above
Noted that JPL Sentry has updated its 2017 GM7 risk assessment - see above
Noted that NEODyS has updated its 2017 GM7 risk assessment - see above
Noted that JPL Sentry has removed 2017 GP6 as an impact risk - see above
Noted that NEODyS has posted 2017 HJ as an impact risk - see above
1634Grabbed MPEC 2017-H43 - 2017 HW1 - see above
1531Noted that NEODyS has removed 2017 FD157 as an impact risk - see above
Noted that NEODyS has removed 2017 FL64 as an impact risk - see above
Grabbed MPEC 2017-H32 - 2017 GC8 - see above
Grabbed MPEC 2017-H33 - 2017 GD8 - see above
Grabbed MPEC 2017-H34 - 2017 HG1 - see above
Grabbed MPEC 2017-H35 - 2017 HJ1 - see above
Grabbed MPEC 2017-H36 - 2017 HK1 - see above
Grabbed MPEC 2017-H37 - 2017 HL1 - see above
Grabbed MPEC 2017-H38 - 2017 HF1 - see above
Grabbed MPEC 2017-H39 - 2017 HH1 - see above
Grabbed MPEC 2017-H40 - Daily Orbit Update - see above
Grabbed MPEC 2017-H41 - Comet P/2017 G2 (Panstarrs) - see above
Grabbed MPEC 2017-H42 - Comet C/2017 G3 (Panstarrs) - see above