Contents  on 26 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 26 April '17

Eight objects reported inside ten LD

Eight minor objects are reported to be inside ten lunar distances (LD) of Earth today. Nearest is newly announced risk-listed 2017 HY3, which comes its closest to Earth this time around, reaching 2.55 LD at 0732 UTC.

Earth passage I D ~Size Distance Today  Notes
0.33 LD April 232017 HV2 6 m  4.36 to 6.44 LD intruder
2.55 LD today2017 HY3 31 m  2.55 LD NEW, risk, Earth closest at 0732 UTC - MPEC
3.17 LD April 202017 HU2 23 m  5.62 to 6.38 LD
3.24 LD April 242017 HY 11 m  4.18 to 5.38 LD
3.59 LD April 242017 HB1 19 m  4.42 to 5.50 LD
3.76 LD April 222017 HD 15 m  9.78 to 12.37 LD exits ten LD
6.12 LD April 302017 HU3 28 m  8.72 from 10.24 LD NEW, enters ten LD - MPEC, DOU
9.18 LD tomorrow2017 HW2 17 m  9.37 from 9.98 LD
Approaching
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target

This report was generated at 1940 UTC with two new discoveries appearing in the traffic table here plus an already departed third object, 2017 HO3 (MPEC), that flew past us at 4.75 LD on April 19th. Today's DOU MPEC has follow-up for one of the new discoveries and for departed objects 2017 HL1, 2017 HZ, radar target 2014 JO25 (which also had radar observation posted late yesterday), and risk-listed NHATS/radar target 2015 TC25.



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 26 April '17

The MPC's NEO Confirmation Page has 45 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 45 objects listed. Of these, 29 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 26 April '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been fourteen MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 26 Apr. '17 >>  MPEC 2017-H71 - "11:59 UT" - Daily Orbit Update


MPEC 2017-H70 - "11:07 UT" - 2017 HY3


MPEC 2017-H69 - "11:04 UT" - 2017 HW3


MPEC 2017-H68 - "10:48 UT" - 2017 HX3


MPEC 2017-H67 - "10:35 UT" - 2014 OD338


MPEC 2017-H66 - "02:52 UT" - 2017 HV3


MPEC 2017-H65 - "02:49 UT" - 2017 HU3


MPEC 2017-H64 - "02:42 UT" - 2017 HT3


MPEC 2017-H63 - "02:38 UT" - 2017 HS3


MPEC 2017-H62 - "02:36 UT" - 2017 HR3


MPEC 2017-H61 - "02:32 UT" - 2017 HQ3


MPEC 2017-H60 - "02:29 UT" - 2017 HP3


MPEC 2017-H59 - "02:25 UT" - 2017 HO3


MPEC 2017-H58 - "02:22 UT" - 2017 HN3

Observers  on 26 April '17

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-H64 -- 2017 HT3
H21Astronomical Research Obs. Westfield in Illinois, 32 in MPECs 2017-H59, 2017-H60, 2017-H61, 2017-H63, 2017-H64, 2017-H65, 2017-H66, 2017-H68, 2017-H69, 2017-H70 & 2017-H71 -- 2017 HY3, 2017 HX3, 2017 HW3, 2017 HV3, 2017 HU3, 2017 HT3, 2017 HS3, 2017 HQ3, 2017 HP3, 2017 HO3, 2017 HK1, 2017 HH, 2017 HF1, 2017 HC1, 2017 GU6, 2017 GT6, 2017 GT5, 2017 GQ6, 2017 GM7, 2017 GK4, 2017 GB8, 2017 FS101, 2017 FR101, 2017 FM90, 2017 FL90, 2017 FE128, 2017 FE1, 2017 FD157, 2017 DS35, 2017 DA109, 2016 LE51, 2016 AH193
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2017-H71 -- 2014 JO25, 484795, 5604
160Castelmartini Obs. in Italy, 6 in MPEC 2017-H71 -- 475665, 456651, 427643, 188174, 163696, 1917
703Catalina Sky Survey in Arizona, 1 in MPEC 2017-H60 -- 2017 HP3
309&Marco Micheli via Cerro Paranal in Chile, 4 in MPEC 2017-H71 -- 2017 FR102, 2017 FC3, 2017 FB1, 2015 TC25
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-H67 -- 2014 OD338
K65Cesena Obs. in Italy, 1 in MPEC 2017-H59 -- 2017 HO3
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-H71 -- 2014 JO25
958Dax Obs. in France, 3 in MPECs 2017-H59, 2017-H60 & 2017-H64 -- 2017 HT3, 2017 HP3, 2017 HO3
K87Dettelbach Vineyard Obs., 1 in MPEC 2017-H71 -- 2014 JO25
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2017-H65, 2017-H66 & 2017-H70 -- 2017 HY3, 2017 HV3, 2017 HU3
734Farpoint Obs. in Kansas, 3 in MPECs 2017-H60, 2017-H62 & 2017-H68 -- 2017 HX3, 2017 HR3, 2017 HP3
157Frasso Sabino Obs. in Italy, 4 in MPEC 2017-H71 -- 2017 GT5, 2017 FJ90, 2016 YU10, 2008 YA
J95Great Shefford Obs. in England, 7 in MPECs 2017-H59, 2017-H60, 2017-H61, 2017-H63, 2017-H64, 2017-H65 & 2017-H70 -- 2017 HY3, 2017 HU3, 2017 HT3, 2017 HS3, 2017 HQ3, 2017 HP3, 2017 HO3
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-H59 -- 2017 HO3
474Mt. John Obs. in New Zealand, 14 in MPECs 2017-H58, 2017-H61, 2017-H62, 2017-H63 & 2017-H71 -- 2017 HZ, 2017 HW1, 2017 HS3, 2017 HR3, 2017 HQ3, 2017 HN3, 2017 HL1, 2017 HJ2, 2017 GK7, 2017 FR64, 2017 ES2, 2016 YZ, 2010 LQ33, 288592
G96Mt. Lemmon Survey (MLS) in Arizona, 19 in MPECs 2017-H58, 2017-H59, 2017-H61, 2017-H62, 2017-H63, 2017-H64, 2017-H65, 2017-H66, 2017-H68, 2017-H69, 2017-H70 & 2017-H71 -- 2017 HY3, 2017 HX3, 2017 HW3, 2017 HV3, 2017 HU3, 2017 HT3, 2017 HS3, 2017 HR3, 2017 HQ3, 2017 HO3, 2017 HN3, 2017 ER22, 2016 GH135, 2010 DP, 434188, 391508, 241662, 188174, 142464
C47Nonndorf Obs. in Austria, 1 in MPEC 2017-H70 -- 2017 HY3
J69North Obs. in England, 1 in MPEC 2017-H70 -- 2017 HY3
Z80Northolt Branch Obs. in England, 5 in MPECs 2017-H60 & 2017-H71 -- 2017 HP3, 2014 JO25, 2011 ED78, 2005 GB120, 474179
C23Olmen Obs. in Belgium, 1 in MPEC 2017-H71 -- 2014 JO25
J43Oukaimeden Obs. in Morocco, 3 in MPEC 2017-H71 -- 2011 ED78, 456651, 190758
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPECs 2017-H66 & 2017-H71 -- 2017 HV3, 2016 UW80, 2016 SD, 90373, 394392, 387505, 370307, 159857, 138155, 136897, 10636, 100926, 3908
L04ROASTERR-1 in Romania, 2 in MPECs 2017-H64 & 2017-H70 -- 2017 HY3, 2017 HT3
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2017-H70 -- 2017 HY3
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2017-H59, 2017-H61 & 2017-H70 -- 2017 HY3, 2017 HQ3, 2017 HO3
H36Sandlot Obs. in Kansas, 2 in MPECs 2017-H60 & 2017-H64 -- 2017 HT3, 2017 HP3
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-H59 -- 2017 HO3
Y00SONEAR in Brazil, 3 in MPEC 2017-H71 -- 2014 JO25, 388838, 1864
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2017-H58 & 2017-H71 -- 2017 HQ3, 2017 HN3, 2017 GQ4, 2017 GL4, 2017 FR64, 2017 FD65, 474231
I93St. Pardon de Conques Obs. in France, 5 in MPECs 2017-H59, 2017-H60, 2017-H61, 2017-H63 & 2017-H64 -- 2017 HT3, 2017 HS3, 2017 HQ3, 2017 HP3, 2017 HO3
I52Steward Obs. Mt. Lemmon Station in Arizona, 18 in MPECs 2017-H58, 2017-H59, 2017-H60, 2017-H61, 2017-H62, 2017-H63, 2017-H64, 2017-H65, 2017-H66, 2017-H68, 2017-H69, 2017-H70 & 2017-H71 -- 2017 HY3, 2017 HX3, 2017 HW3, 2017 HV3, 2017 HU3, 2017 HT3, 2017 HS3, 2017 HR3, 2017 HQ3, 2017 HP3, 2017 HO3, 2017 HN3, 2017 HH2, 2017 HF1, 2017 HA1, 2017 GV6, 2017 GS5, 2017 GP6
926Tenagra II Obs. in Arizona, 12 in MPECs 2017-H58, 2017-H59, 2017-H60, 2017-H61, 2017-H62, 2017-H63, 2017-H64, 2017-H68, 2017-H69 & 2017-H71 -- 2017 HX3, 2017 HW3, 2017 HT3, 2017 HS3, 2017 HR3, 2017 HQ3, 2017 HP3, 2017 HO3, 2017 HN3, 2017 HH2, 2017 GT5, 2017 GB8
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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 HY3JPL Sentry16072024-202412.749e-09-7.66-7.660JPL: Computed at 06:57 today Pacific time based on 52 observations spanning 1.7307 days (2017-Apr-24.37009 to 2017-Apr-26.100761). Diameter approximately 0.031 km. from weighted mean H=25.22.
2017 HT2NEODyS16072024-2116752.8e-06-2.15-2.650NEODyS: "Based on 73 optical observations (of which 0 are rejected as outliers) from 2017-04-20.308 to 2017-04-24.954."
2017 HJNEODyS16072070-2117227.45e-06-6.39-6.550NEODyS: "Based on 62 optical observations (of which 1 are rejected as outliers) from 2017-04-17.426 to 2017-04-24.984."
2017 GM7NEODyS1607211216.31e-10-6.22-6.220NEODyS: "Based on 50 optical observations (of which 1 are rejected as outliers) from 2017-04-07.257 to 2017-04-24.887."
2017 FO128NEODyS1607210926.74e-08-6.10-6.10NEODyS: "Based on 90 optical observations (of which 2 are rejected as outliers) from 2017-03-30.263 to 2017-04-24.917."
2017 FR102JPL Sentry17302116-211626.6005e-08-7.36-7.390JPL #2 for the day: Computed at 10:11 today Pacific time based on 23 observations spanning 27.708 days (2017-Mar-27.55657 to 2017-Apr-24.264614). Diameter approximately 0.039 km. from weighted mean H=24.67.
2017 FC3JPL Sentry1607R E M O V E DJPL: Risk listing removed at 1521 UTC today.
NEODyS1607R E M O V E D-
2017 FB1JPL Sentry17302106-210631.79182e-06-4.91-5.180JPL #2 for the day: Computed at 10:08 today Pacific time based on 40 observations spanning 36.957 days (2017-Mar-18.20739 to 2017-Apr-24.163996). Diameter approximately 0.072 km. from weighted mean H=23.35.
2016 JY5JPL Sentry17302093-210721.8662e-08-9.15-9.310JPL: Computed at 10:19 today Pacific time based on 55 observations spanning 5.9547 days (2016-May-04.25836 to 2016-May-10.21309). Diameter approximately 0.013 km. from weighted mean H=27.13.
2015 QS8JPL Sentry18062116-211614.166e-06-6.53-6.530JPL: Computed at 10:48 today Pacific time based on 31 observations spanning 4.1772 days (2015-Aug-22.19414 to 2015-Aug-26.371314). Diameter approximately 0.017 km. from weighted mean H=26.54.
2014 HN2JPL Sentry19002112-211219.755e-09-9.18-9.180JPL: Computed at 11:42 today Pacific time based on 64 observations spanning 42.644 days (2014-Apr-21.24439 to 2014-Jun-02.88797). Diameter approximately 0.018 km. from weighted mean H=26.34.
2013 NR13JPL Sentry16072114-211413.976e-08-8.06-8.060JPL: Computed at 07:38 today Pacific time based on 12 observations spanning 3.8152 days (2013-Jul-12.48834 to 2013-Jul-16.3035). Diameter approximately 0.024 km. from weighted mean H=25.75.
2006 DNJPL Sentry23582056-205613.613e-07-6.31-6.310JPL: Computed at 16:55 today Pacific time based on 153 observations spanning 34.099 days (2006-Feb-20.39634 to 2006-Mar-26.49499). Diameter approximately 0.043 km. from weighted mean H=24.49.
2002 EM7JPL Sentry22222117-211726.0634e-08-7.27-7.280JPL: Computed at 14:34 today Pacific time based on 69 observations spanning 24.961 days (2002-Mar-12.30675 to 2002-Apr-06.26806). Diameter approximately 0.045 km. from weighted mean H=24.38.

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 26 April '17

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

2358Noted that JPL Sentry has reposted 2006 DN as an impact risk - see above
2222Noted that JPL Sentry has reposted 2002 EM7 as an impact risk - see above
1940Generated Traffic Report
1900Noted that JPL Sentry has reposted 2014 HN2 as an impact risk - see above
1806Noted that JPL Sentry has posted 2015 QS8 as an impact risk - see above
1730Noted that JPL Sentry has reposted 2016 JY5 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 FB1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FR102 risk assessment - see above
1607Noted that JPL Sentry has posted 2013 NR13 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 FB1 risk assessment - see above
Noted that JPL Sentry has removed 2017 FC3 as an impact risk - see above
Noted that NEODyS has removed 2017 FC3 as an impact risk - see above
Noted that NEODyS has updated its 2017 FO128 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FR102 risk assessment - see above
Noted that NEODyS has updated its 2017 GM7 risk assessment - see above
Noted that NEODyS has updated its 2017 HJ risk assessment - see above
Noted that NEODyS has updated its 2017 HT2 risk assessment - see above
Noted that JPL Sentry has posted 2017 HY3 as an impact risk - see above
Grabbed MPEC 2017-H67 - 2014 OD338 - see above
Grabbed MPEC 2017-H68 - 2017 HX3 - see above
Grabbed MPEC 2017-H69 - 2017 HW3 - see above
Grabbed MPEC 2017-H70 - 2017 HY3 - see above
Grabbed MPEC 2017-H71 - Daily Orbit Update - see above
0300Grabbed MPEC 2017-H58 - 2017 HN3 - see above
Grabbed MPEC 2017-H59 - 2017 HO3 - see above
Grabbed MPEC 2017-H60 - 2017 HP3 - see above
Grabbed MPEC 2017-H61 - 2017 HQ3 - see above
Grabbed MPEC 2017-H62 - 2017 HR3 - see above
Grabbed MPEC 2017-H63 - 2017 HS3 - see above
Grabbed MPEC 2017-H64 - 2017 HT3 - see above
Grabbed MPEC 2017-H65 - 2017 HU3 - see above
Grabbed MPEC 2017-H66 - 2017 HV3 - see above