Contents  on 3 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 3 April '17

Fourteen objects reported inside ten LD

There are fourteen minor objects reported passing within ten lunar distances (LD) of Earth today. The nearest of these, intruder and NHATS target 2017 FU102, starts the day at 0.62 LD from our planet and heads out to 2.00 LD. Two others are at similar ranges inside Earth's SOI (sphere of gravitational influence). NHATS target 2017 FT102 comes its closest to Earth this time around, reaching 1.05 LD at 1716 UTC, and its closest to the Moon -- 1.04 LD at 1822 UTC, and risk-listed 2017 FQ127 gets its closest -- 2.05 LD from Earth at 1550 UTC and 2.21 LD from the Moon at 1730 UTC.

Earth passage I D ~Size Distance Today  Notes
0.57 LD yesterday2017 FU102 6 m  0.62 to 2.00 LD intruder today, inside Earth SOI, NHATS target
0.85 LD March 302017 FJ101 7 m  9.30 to 11.82 LD intruder, exits ten LD
1.05 LD today2017 FT102 4 m  1.05 LD inside Earth SOI, NHATS target, Earth closest at 1716 UTC, Moon closest 1.04 LD at 1822 UTC - DOU
2.05 LD today2017 FQ127 20 m  2.05 LD enters Earth SOI, risk, Earth closest at 1550 UTC, Moon closest 2.21 at 1730 UTC - DOU
2.37 LD April 12017 FX90 18 m  3.99 to 6.40 LD DOU
2.57 LD March 222017 FJ3 4 m  5.88 to 6.30 LD NHATS target
3.54 LD March 292017 FR91 14 m  9.51 to 11.51 LD exits ten LD, NHATS target
5.21 LD April 62017 FW128 12 m  6.55 from 7.48 LD risk - DOU
5.75 LD March 272017 FF3 15 m  7.20 to 7.60 LD NHATS target
7.03 LD tomorrow2017 FM101 16 m  7.21 from 7.90 LD NHATS target
7.63 LD March 262015 TC25 4 m  9.46 to 9.94 LD radar/NHATS target, risk
7.69 LD April 72017 FS102 13 m  9.93 from 11.04 LD enters ten LD, risk - DOU
8.18 LD March 312017 FP128 58 m  9.57 to 10.68 LD exits ten LD
8.99 LD yesterday2017 FV 47 m  9.38 to 10.73 LD exits ten LD, radar target, risk - DOU

This report was generated at 1749 UTC with follow-up in today's DOU MPEC for nine objects active in the traffic tables here, and for five departed objects: 2017 FO101, 2017 FU90, NHATS target 2017 FS91, and risk listed objects 2017 FB102 and NHATS target 2017 FW90.

Approaching (sorted by 10-LD bubble entry date)
3.74 LD April 62017 FU64 59 m  < 10 LD tomorrow - DOU
9.92 LD April 52017 FX101 30 m  < 10 LD tomorrow, NHATS target - DOU
6.66 LD April 132017 FF128 26 m  < 10 LD April 10
4.57 LD April 192014 JO25 812 m  < 10 LD April 18, radar target
7.92 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU



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.

Radar Astrometry  on 3 April '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2130 UTC when the database was dated 3 April

NEOCP Activity  on 3 April '17

The MPC's NEO Confirmation Page has 79 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 79 objects listed. Of these, 38 were "one nighters." So far The Tracking News has counted a total of 97 listings on the NEOCP today.

New MPECs  on 3 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 3 Apr. '17 >>  MPEC 2017-G26 - "12:04 UT" - Daily Orbit Update

Observers  on 3 April '17

A total of 22 observers appear in today's MPEC.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2015 TC25
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPEC 2017-G26 -- 2017 FU90, 2017 DB36
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-G26 -- 5653
T08ATLAS Mauna Loa in Hawaii, 15 in MPEC 2017-G26 -- 2017 DT37, 2017 CR32, 87024, 484795, 413002, 252091, 22771, 220124, 7341, 5604, 4055, 3552, 3199, 2329, 1036
160Castelmartini Obs. in Italy, 21 in MPEC 2017-G26 -- 2017 DT37, 2017 DC38, 2017 AC5, 90075, 54789, 484795, 427643, 40267, 388838, 370702, 252091, 138359, 137158, 10636, 5653, 5604, 4179, 3352, 3103, 2329, 1627
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPEC 2017-G26 -- 2017 FX2, 2017 FT, 2017 FP102, 2017 EL, 2017 EH4, 2017 EC, 2017 BE29
W845Lori Allen via DECam in Chile, 1 in MPEC 2017-G26 -- 2014 LN14
J95Great Shefford Obs. in England, 2 in MPEC 2017-G26 -- 2017 FT102, 2017 FQ127
K92LCOGT Sutherland B in South Africa, 1 in MPEC 2017-G26 -- 2017 EH4
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-G26 -- 2017 FW128
J69North Obs. in England, 2 in MPEC 2017-G26 -- 2017 DC38, 474231
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2017-G26 -- 2014 GD45, 1917
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2017-G26 -- 2013 GU68, 483459, 381906
W98Polonia Obs. in Chile, 1 in MPEC 2017-G26 -- 370307
W25RMS Obs., 4 in MPEC 2017-G26 -- 2017 FU64, 2017 DC38, 2017 AC5, 138155
Y00SONEAR in Brazil, 2 in MPEC 2017-G26 -- 138404, 1864
691Spacewatch 0.9m telescope in Arizona, 8 in MPEC 2017-G26 -- 2017 FY90, 2017 FS102, 2017 FP64, 2017 FO2, 2017 FM63, 2017 EW2, 2017 CS, 2014 NB39
291Spacewatch 1.8m telescope in Arizona, 12 in MPEC 2017-G26 -- 2017 FZ101, 2017 FX, 2017 FU, 2017 FR102, 2017 FP2, 2017 FL91, 2017 FK90, 2017 FB102, 2017 EO22, 2017 BL6, 2017 BB94, 2011 CX7
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-G26 -- 143404
I52Steward Obs. Mt. Lemmon Station in Arizona, 24 in MPEC 2017-G26 -- 2017 FZ101, 2017 FX101, 2017 FS91, 2017 FS102, 2017 FS101, 2017 FQ64, 2017 FQ127, 2017 FP91, 2017 FP102, 2017 FP101, 2017 FO90, 2017 FO101, 2017 FN102, 2017 FN101, 2017 FM90, 2017 FM102, 2017 FK90, 2017 FF65, 2017 FE3, 2017 FD65, 2017 FC101, 2017 ER22, 2017 EE23, 2017 EC3
926Tenagra II Obs. in Arizona, 2 in MPEC 2017-G26 -- 2017 FX101, 2017 FM102
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 6 in MPEC 2017-G26 -- 2017 FX90, 2017 FW90, 2017 FV, 2017 FS102, 2017 FE101, 2017 FC1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 April '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL 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 JPL NEO Program 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 FW128JPL Sentry1630207211.0e-07-8.28-8.280JPL: "Analysis based on 44 observations spanning 4.0537 days (2017-Mar-30.38058 to 2017-Apr-03.43427)." Diameter approximately 0.012 km. from mean, weighted H=27.2.
2017 FN128NEODyS14352049-2116432.29e-06-2.44-2.850NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2017-03-27.304 to 2017-04-01.264."
2017 FS102JPL Sentry1630R E M O V E DJPL: Risk listing removed at 1611 UTC.
2017 FR102JPL Sentry17312089-2117136.4e-06-5.25-5.370JPL #2 for the day: "Analysis based on 18 observations spanning 5.9256 days (2017-Mar-27.55657 to 2017-Apr-02.4822)." Diameter approximately 0.040 km. from mean, weighted H=24.6.
NEODyS14352089-2117281.37e-05-4.87-4.960NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2017-03-27.557 to 2017-04-01.499."
2017 FB102JPL Sentry17312054-211357.4e-07-7.11-7.460JPL #2 for the day: "Analysis based on 29 observations spanning 5.9500 days (2017-Mar-27.55104 to 2017-Apr-02.50099)." Diameter approximately 0.015 km. from mean, weighted H=26.8.
NEODyS14352063-211355.49e-07-7.20-7.370NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2017-03-27.552 to 2017-04-01.515."
2017 FW90JPL Sentry17312101-210452.5e-05-6.56-6.900JPL #2 for the day: "Analysis based on 73 observations spanning 7.0074 days (2017-Mar-25.34512 to 2017-Apr-01.352566)." Diameter approximately 0.008 km. from mean, weighted H=28.1.
NEODyS14352101-211782.69e-05-6.52-6.940NEODyS: "Based on 73 optical observations (of which 6 are rejected as outliers) from 2017-03-25.346 to 2017-03-31.360."
2017 FO63JPL Sentry1832209712.9e-06-4.54-4.540JPL: "Analysis based on 58 observations spanning 9.8597 days (2017-Mar-21.38988 to 2017-Mar-31.249601)." Diameter approximately 0.070 km. from mean, weighted H=23.4.
2017 FC1JPL Sentry1731206412.9e-08-8.17-8.170JPL #2 for the day: "Analysis based on 88 observations spanning 18.194 days (2017-Mar-14.415078 to 2017-Apr-01.608654)." Diameter approximately 0.020 km. from mean, weighted H=26.1.
NEODyS1435206414.15e-06-6.00-6.00NEODyS: "Based on 86 optical observations (of which 2 are rejected as outliers) from 2017-03-14.416 to 2017-03-31.502."
2017 FVJPL Sentry1530R E M O V E DJPL: Risk listing removed at 1518 UTC.
NEODyS14352101-211789.53e-08-6.92-7.440NEODyS: "Based on 88 optical observations (of which 0 are rejected as outliers) from 2017-03-17.266 to 2017-04-01.875."
2015 TC25NEODyS1435211111.26e-08-10.57-10.570NEODyS: "Based on 32 optical observations (of which 1 are rejected as outliers) from 2015-10-11.291 to 2017-03-31.513."

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 3 April '17

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

2130Noted Radar Astrometry database update - see above
1832Noted that JPL Sentry has updated its 2017 FO63 risk assessment - see above
1749Generated Traffic Report
1731Noted that JPL Sentry has updated its 2017 FB102 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FC1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FR102 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FW90 risk assessment - see above
1630Noted that JPL Sentry has updated its 2017 FB102 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FR102 risk assessment - see above
Noted that JPL Sentry has removed 2017 FS102 as an impact risk - see above
Noted that JPL Sentry has posted 2017 FW128 as an impact risk - see above
1530Noted that JPL Sentry has updated its 2017 FC1 risk assessment - see above
Noted that JPL Sentry has removed 2017 FV as an impact risk - see above
Noted that JPL Sentry has updated its 2017 FW90 risk assessment - see above
1435Noted that NEODyS has updated its 2015 TC25 risk assessment - see above
Noted that NEODyS has updated its 2017 FB102 risk assessment - see above
Noted that NEODyS has updated its 2017 FC1 risk assessment - see above
Noted that NEODyS has posted 2017 FN128 as an impact risk - see above
Noted that NEODyS has updated its 2017 FR102 risk assessment - see above
Noted that NEODyS has updated its 2017 FV risk assessment - see above
Noted that NEODyS has updated its 2017 FW90 risk assessment - see above
Grabbed MPEC 2017-G26 - Daily Orbit Update - see above