Contents  on 23 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 23 April '17

Eight objects reported inside ten LD

Eight minor bodies are reported to be within ten lunar distances (LD) of Earth today. Newly announced intruder 2017 HV2 is the nearest, passing Earth at 0.33 LD at 2202 UTC.

Earth passage I D ~Size Distance Today  Notes
0.33 LD today2017 HV2 6 m  0.33 LD NEW, intruder today, Earth closest at 2202 UTC - MPEC
1.05 LD April 32017 FT102 4 m  9.67 to 10.17 LD exits ten LD, NHATS target
2.81 LD April 162017 HG1 12 m  9.23 to 10.61 LD exits ten LD
3.17 LD April 202017 HU2 23 m  3.71 to 4.25 LD NEW - MPEC
3.24 LD tomorrow2017 HY 11 m  3.31 from 4.00 LD DOU
3.59 LD tomorrow2017 HB1 19 m  3.64 from 4.21 LD DOU
3.76 LD yesterday2017 HD 15 m  3.84 to 5.17 LD DOU
6.07 LD today2017 HH1 26 m  6.07 LD Earth closest at 1454 UTC - DOU
Approaching
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU
9.18 LD April 272017 HW2 17 m  < 10 LD April 25, NEW - MPEC

This report was generated at 2217 UTC with three discoveries, all objects active in the traffic table here, and follow-up tracking in today's DOU MPEC for five objects in the table and seven more that have departed: 2017 HL1, 2017 HZ, 2017 HF, 2017 HE, 2017 FO101, risk-listed intruder 2017 HJ, and radar target 2014 JO25.



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 23 April '17

The MPC's NEO Confirmation Page has 34 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 34 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 46 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 23 April '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.


MPEC 2017-H55 - "14:35 UT" - 2017 HV2


MPEC 2017-H54 - "14:31 UT" - 2017 HU2


MPEC 2017-H53 - "14:27 UT" - 2017 HW2


MPEC 2017-H52 - "14:23 UT" - 2017 HT2


MPEC 2017-H51 - "13:36 UT" - 2016 NV15


MPEC 2017-H50 - "13:34 UT" - 2015 KJ122


<< DOU on 23 Apr. '17 >>  MPEC 2017-H49 - "12:05 UT" - Daily Orbit Update

Observers  on 23 April '17

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-H52 -- 2017 HT2
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-H54 -- 2017 HU2
H21Astronomical Research Obs. Westfield in Illinois, 32 in MPECs 2017-H49 & 2017-H54 -- 2017 HU2, 2017 GT5, 2017 GR6, 2017 GR5, 2017 GM4, 2017 GK4, 2017 FR128, 2017 FP64, 2017 FP, 2017 FM128, 2017 FL90, 2017 FL1, 2017 FJ90, 2017 FH90, 2017 FH128, 2017 FH101, 2017 FE128, 2017 FE1, 2017 ES22, 2017 ER22, 2017 BG85, 2017 AC5, 2016 UW80, 2008 SQ7, 2004 SW55, 370307, 252091, 220124, 143404, 11398, 4954, 1036
T08ATLAS Mauna Loa in Hawaii, 3 in MPEC 2017-H49 -- 2014 JO25, 90075, 1036
160Castelmartini Obs. in Italy, 8 in MPEC 2017-H49 -- 2017 GT5, 2017 GB8, 2017 FG128, 2011 ED78, 1998 HK1, 474231, 220124, 138359
703Catalina Sky Survey (CSS) in Arizona, 18 in MPECs 2017-H49 & 2017-H54 -- 2017 HU2, 2017 FD65, 2017 DS35, 2017 AC5, 2016 HJ19, 2006 UM, 85275, 474425, 474231, 343158, 250614, 154144, 143637, 136582, 7088, 3352, 3103, 2329
107Cavezzo Obs. in Italy, 4 in MPECs 2017-H49 & 2017-H54 -- 2017 HU2, 2017 CS, 484795, 474179
K51Celado Obs. in Italy, 1 in MPEC 2017-H54 -- 2017 HU2
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2017-H49 -- 2017 HU, 2017 HT, 2017 GU5, 2017 GL6, 2017 FO101, 2017 FJ63, 2017 EV2, 2017 EH4, 2017 EH, 2017 DD, 2017 BW32
958Dax Obs. in France, 2 in MPECs 2017-H54 & 2017-H55 -- 2017 HV2, 2017 HU2
006Fabra Obs. in Spain, 2 in MPEC 2017-H49 -- 2014 JO25, 2329
G27Fabra Obs. in Spain, 1 in MPEC 2017-H49 -- 2014 JO25
J95Great Shefford Obs. in England, 6 in MPECs 2017-H49, 2017-H53, 2017-H54 & 2017-H55 -- 2017 HY, 2017 HW2, 2017 HV2, 2017 HU2, 2017 HH1, 2017 HB1
K78Iota Scorpii Obs., 2 in MPEC 2017-H49 -- 220124, 10636
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-H49 -- 405427
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-H49 -- 2017 HH
J38La Vara Obs. in Spain, 1 in MPEC 2017-H49 -- 2014 JO25
K38M57 Obs. in Italy, 1 in MPEC 2017-H54 -- 2017 HU2
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2017-H52, 2017-H53, 2017-H54 & 2017-H55 -- 2017 HW2, 2017 HV2, 2017 HU2, 2017 HT2
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-H49 -- 2017 HK1
474Mt. John Obs. in New Zealand, 12 in MPECs 2017-H49, 2017-H50 & 2017-H51 -- 2017 HZ, 2017 HY, 2017 HL1, 2017 GO6, 2017 FX64, 2017 FP63, 2017 ES2, 2016 NV15, 2015 KJ122, 2014 UD206, 2007 VO243, 288592
G96Mt. Lemmon Survey (MLS) in Arizona, 21 in MPECs 2017-H49, 2017-H52, 2017-H53 & 2017-H55 -- 2017 HW2, 2017 HV2, 2017 HT2, 2017 GU6, 2017 GT6, 2017 GM6, 2017 FC157, 2016 UW80, 2011 GD68, 2006 BX139, 2005 GO59, 2003 FR6, 66400, 54789, 343158, 343098, 339492, 322756, 16912, 139289, 138095
J69North Obs. in England, 1 in MPEC 2017-H49 -- 2014 JO25
Z80Northolt Branch Obs. in England, 3 in MPECs 2017-H49 & 2017-H54 -- 2017 HU2, 2017 FH101, 2014 JO25
Z73Nuevos Horizontes Obs. in Spain, 1 in MPEC 2017-H49 -- 2014 JO25
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPEC 2017-H49 -- 2017 HA1, 2014 GD45, 483408, 405427, 18109, 175189, 3552
W25RMS Obs., 2 in MPECs 2017-H54 & 2017-H55 -- 2017 HV2, 2017 HU2
V83Rolling Hills Obs. in Missouri, 1 in MPEC 2017-H49 -- 2014 JO25
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2017-H49, 2017-H54 & 2017-H55 -- 2017 HV2, 2017 HU2, 2014 JO25
204Schiaparelli Obs. in Italy, 2 in MPECs 2017-H54 & 2017-H55 -- 2017 HV2, 2017 HU2
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-H49 -- 2017 GB8
691Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2017-H49 -- 2017 HH, 2017 HE, 2017 FS101, 2017 FP64, 2017 FN128, 2017 FE128, 2017 EV2, 2016 VV3, 2016 SD, 2000 AF205, 203217
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2017-H49 & 2017-H52 -- 2017 HT2, 2017 HF, 2017 FO128, 2017 FE90, 2017 FE65, 2017 FD157, 2017 ED3, 2017 CM32, 2017 BM31, 2012 TZ79
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-H49 -- 2014 JO25
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2017-H55 -- 2017 HV2
I52Steward Obs. Mt. Lemmon Station in Arizona, 9 in MPECs 2017-H49, 2017-H52, 2017-H53, 2017-H54 & 2017-H55 -- 2017 HW2, 2017 HV2, 2017 HU2, 2017 HT2, 2017 HS, 2017 HL1, 2017 HF1, 2017 GL7, 2017 FC157
926Tenagra II Obs. in Arizona, 19 in MPECs 2017-H49, 2017-H50, 2017-H52, 2017-H53, 2017-H54 & 2017-H55 -- 2017 HY, 2017 HW2, 2017 HV2, 2017 HU2, 2017 HT2, 2017 HL1, 2017 HH1, 2017 HH, 2017 HD, 2017 HC1, 2017 HB1, 2017 GT5, 2017 GO7, 2017 GK4, 2017 GB8, 2017 FX64, 2017 FS101, 2016 XH2, 2015 KJ122
H32Texas A&M Physics Obs. in Texas, 1 in MPEC 2017-H49 -- 2014 JO25
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 6 in MPECs 2017-H49 & 2017-H55 -- 2017 HV2, 2017 HJ, 2017 FO128, 2017 FN128, 2017 FD157, 2014 JO25
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 HT2JPL Sentry16212028-2114363.700859e-07-2.95-3.120JPL: Computed at 08:58 today Pacific time based on 34 observations spanning 3.0360 days (2017-Apr-20.30727 to 2017-Apr-23.34332). Diameter approximately 0.735 km. from weighted mean H=18.32.
2017 HJJPL Sentry16212089-211777.686337e-06-6.38-6.530JPL:
NEODyS01302073-2117187.96e-06-6.36-6.510NEODyS: "Based on 48 optical observations (of which 1 are rejected as outliers) from 2017-04-17.426 to 2017-04-22.187."
2017 GG8NEODyS20302046-21171111.8e-05-5.45-6.290NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2017-04-06.497 to 2017-04-07.404."
2017 GM6JPL Sentry16212111-211325.674e-07-7.17-7.400JPL:
NEODyS0130211112.81e-08-8.50-8.50NEODyS: "Based on 37 optical observations (of which 1 are rejected as outliers) from 2017-04-05.343 to 2017-04-21.358."
2017 FA159NEODyS20302019-21164522.5e-07-7.75-8.40NEODyS: "Based on 8 optical observations (of which 0 are rejected as outliers) from 2017-03-18.260 to 2017-03-18.424."
2017 FX158NEODyS20302090-211132.01e-09-10.99-11.010NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2017-03-21.378 to 2017-03-22.493."
2017 FW158NEODyS20302049-2117352.57e-06-7.31-8.10NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2017-03-19.398 to 2017-03-21.396."
2017 FO128JPL Sentry16212104-210932.1822e-07-5.59-5.750JPL: Computed at 08:05 today Pacific time based on 76 observations spanning 24.101 days (2017-Mar-30.26183 to 2017-Apr-23.36277). Diameter approximately 0.110 km. from weighted mean H=22.44.
2017 FN128NEODyS0130206411.64e-11-7.33-7.330NEODyS: "Based on 62 optical observations (of which 0 are rejected as outliers) from 2017-03-27.304 to 2017-04-22.145."
2017 FW90NEODyS01302101-211793.95e-05-6.36-6.770NEODyS: "Based on 83 optical observations (of which 6 are rejected as outliers) from 2017-03-25.346 to 2017-04-05.397."
2017 FO63NEODyS01302097-210822.68e-06-4.58-4.580NEODyS: "Based on 60 optical observations (of which 0 are rejected as outliers) from 2017-03-21.391 to 2017-03-31.250."
2016 XP23JPL Sentry16212110-211016.415e-10-6.62-6.620JPL: Computed at 06:44 today Pacific time based on 39 observations spanning 29.085 days (2016-Dec-09.1011 to 2017-Jan-07.18635). Diameter approximately 0.370 km. from weighted mean H=19.83.
2015 VD105JPL Sentry16212094-209411.449e-09-8.91-8.910JPL: Computed at 22:27 April 22nd Pacific time based on 61 observations spanning 2.1470 days (2015-Nov-11.23146 to 2015-Nov-13.37842). Diameter approximately 0.041 km. from weighted mean H=24.60.
2011 SL189JPL Sentry04302043-210058.634e-10-8.84-9.360JPL: Computed at 20:50 April 22nd Pacific time based on 11 observations spanning .91578 days (2011-Sep-29.31662 to 2011-Sep-30.2324). Diameter approximately 0.040 km. from weighted mean H=24.63.
2010 SK13JPL Sentry16212084-208412.509e-09-9.64-9.640JPL: Computed at 06:37 today Pacific time based on 49 observations spanning 2.0600 days (2010-Sep-28.30637 to 2010-Sep-30.36632). Diameter approximately 0.012 km. from weighted mean H=27.29.

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 23 April '17

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

2217Generated Traffic Report
2030Noted that NEODyS has posted 2017 FA159 as an impact risk - see above
Noted that NEODyS has posted 2017 FW158 as an impact risk - see above
Noted that NEODyS has posted 2017 FX158 as an impact risk - see above
Noted that NEODyS has posted 2017 GG8 as an impact risk - see above
1621Noted that JPL Sentry has reposted 2010 SK13 as an impact risk - see above
Noted that JPL Sentry has posted 2015 VD105 as an impact risk - see above
Noted that JPL Sentry has reposted 2016 XP23 as an impact risk - see above
Noted that JPL Sentry 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 HJ risk assessment - see above
Noted that JPL Sentry has posted 2017 HT2 as an impact risk - see above
Grabbed MPEC 2017-H49 - Daily Orbit Update - see above
Grabbed MPEC 2017-H50 - 2015 KJ122 - see above
Grabbed MPEC 2017-H51 - 2016 NV15 - see above
Grabbed MPEC 2017-H52 - 2017 HT2 - see above
Grabbed MPEC 2017-H53 - 2017 HW2 - see above
Grabbed MPEC 2017-H54 - 2017 HU2 - see above
Grabbed MPEC 2017-H55 - 2017 HV2 - see above
0430Noted that JPL Sentry has posted 2011 SL189 as an impact risk - see above
0130Noted that NEODyS has updated its 2017 FN128 risk assessment - see above
Noted that NEODyS has updated its 2017 FO63 risk assessment - see above
Noted that NEODyS has updated its 2017 FW90 risk assessment - see above
Noted that NEODyS has posted 2017 GM6 as an impact risk - see above
Noted that NEODyS has updated its 2017 HJ risk assessment - see above