Contents  on 5 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 5 April '17

Thirteen objects reported inside ten LD

Thirteen Solar-System small bodies are known to be traveling inside ten lunar distances (LD) of Earth today. Nearest of these, NHATS target 2017 FT102, is within Earth's SOI (sphere of gravitational influence), outbound from 1.24 to 1.57 LD, and risk-listed intruder 2017 GM exits the SOI, flying from 2.18 to 6.03 LD.

Earth passage I D ~Size Distance Today  Notes
0.04 LD yesterday2017 GM 4 m  2.18 to 6.03 LD intruder, exits Earth SOI, risk - DOU
0.57 LD April 22017 FU102 6 m  3.61 to 5.24 LD intruder, NHATS target
1.05 LD April 32017 FT102 4 m  1.24 to 1.57 LD NHATS target, inside Earth SOI - DOU
2.05 LD April 32017 FQ127 19 m  4.76 to 7.77 LD risk - DOU
2.37 LD April 12017 FX90 18 m  8.99 to 11.65 LD exits ten LD
2.57 LD March 222017 FJ3 4 m  6.72 to 7.14 LD NHATS target
3.5   LD April 92017 GT4 17 m  7.3 from 9.2 LD uncertainty +/- 15 mins.
3.74 LD tomorrow2017 FU64 57 m  5.09 from 8.62 LD DOU
5.20 LD tomorrow2017 FW128 12 m  5.34 from 5.81 LD NHATS target, risk - DOU
5.75 LD March 272017 FF3 15 m  8.03 to 8.48 LD NHATS target
7.03 LD yesterday2017 FM101 16 m  7.04 to 7.44 LD NHATS target - DOU
7.69 LD April 72017 FS102 13 m  8.25 from 8.98 LD risk - DOU
9.92 LD today2017 FX101 29 m  9.92 LD exits ten LD, NHATS target, Earth closest at 1038 UTC - DOU

This report was generated at 1840 UTC with the discovery of already departed 2017 GW4 (MPEC), which went past us at 2.48 LD on April 1st, and with follow-up in today's DOU MPEC for eight objects active in the traffic tables here plus five departed objects: 2017 GH4, 2017 FP128, NHATS target 2017 FQ63, and risk-listed NHATS targets 2017 FW90 and 2017 FL64.

Approaching (sorted by 10-LD bubble entry date)
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



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 5 April '17

The MPC's NEO Confirmation Page has 61 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 61 objects listed. Of these, 27 were "one nighters." So far The Tracking News has counted a total of 77 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 5 April '17

Minor Planet Electronic Circulars

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


<< DOU on 5 Apr. '17 >>  MPEC 2017-G53 - "12:06 UT" - Daily Orbit Update


MPEC 2017-G52 - "10:47 UT" - 2012 FA14


MPEC 2017-G51 - "02:06 UT" - 2017 GW4

Observers  on 5 April '17

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2017-G53 -- 1998 HK1, 480934
107Cavezzo Obs. in Italy, 1 in MPEC 2017-G53 -- 143404
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-G51 -- 2017 GW4
K65Cesena Obs. in Italy, 1 in MPEC 2017-G53 -- 2017 AC5
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-G53 -- 2017 FU64
W845Lori Allen via DECam in Chile, 13 in MPEC 2017-G53 -- 455554, 394155, 338176, 338172, 283457, 171819, 164201, 159495, 7358, 4179, 3908, 2101, 2061
006Fabra Obs. in Spain, 4 in MPEC 2017-G53 -- 388838, 370307, 143404, 2329
J95Great Shefford Obs. in England, 1 in MPEC 2017-G51 -- 2017 GW4
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-G53 -- 2017 GK4
246KLENOT in the Czech Republic, 2 in MPEC 2017-G53 -- 2017 FP, 4055
W92MASTER OAFA Obs., 2 in MPEC 2017-G53 -- 190166, 3122
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-G53 -- 143404
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPEC 2017-G53 -- 2017 GM4, 2017 FT128, 2017 FO91, 2017 EW2, 2001 HW7, 405427, 391033, 252091
583Odessa-Mayaki Obs. in the Ukraine, 1 in MPEC 2017-G53 -- 370307
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2017-G53 -- 2006 EC1, 154652
F51Pan-STARRS 1 (PS1) in Hawaii, 19 in MPECs 2017-G51 & 2017-G53 -- 2017 GW4, 2017 FR90, 2017 FO90, 2017 FK91, 2017 CR32, 2017 CO5, 2016 VV3, 2016 GH135, 2013 AP60, 2012 EC, 2010 VE1, 2000 GW127, 469513, 386259, 37336, 367684, 276468, 189973, 136793
Y00SONEAR in Brazil, 1 in MPEC 2017-G53 -- 2017 ES2
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2017-G53 -- 2017 GH4, 2017 FL90, 2017 FE101, 2017 EV2, 2017 AP20, 2016 VV3, 162452
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2017-G53 -- 2017 GM4, 2017 FW90, 2017 FO128
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-G53 -- 143404
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-G53 -- 143404
I52Steward Obs. Mt. Lemmon Station in Arizona, 17 in MPEC 2017-G53 -- 2017 FW128, 2017 FV128, 2017 FU128, 2017 FS64, 2017 FS102, 2017 FQ63, 2017 FP128, 2017 FP, 2017 FK128, 2017 FJ128, 2017 FH128, 2017 FF101, 2017 FE90, 2017 FD1, 2017 ES22, 2015 EB7, 138359
926Tenagra II Obs. in Arizona, 10 in MPECs 2017-G51 & 2017-G53 -- 2017 GW4, 2017 GM, 2017 FX101, 2017 FU64, 2017 FT128, 2017 FT102, 2017 FS102, 2017 FQ128, 2017 FQ127, 2017 FM101
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPECs 2017-G52 & 2017-G53 -- 2017 FL64, 2017 FC3, 2012 FA14
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 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 Sentry1602R E M O V E DJPL: Risk listing removed at 1539 UTC.
2017 FO128JPL Sentry16022076-210447.2e-06-4.07-4.230JPL: "Analysis based on 44 observations spanning 6.0449 days (2017-Mar-30.26183 to 2017-Apr-05.30671)." Diameter approximately 0.110 km. from mean, weighted H=22.5.
NEODyS15142104-211591.66e-05-3.72-3.910NEODyS: "Based on 41 optical observations (of which 1 are rejected as outliers) from 2017-03-30.263 to 2017-04-04.436."
2017 FN128NEODyS15142059-2116273.56e-06-2.15-2.480NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2017-03-27.304 to 2017-04-04.130."
2017 FR102NEODyS15142089-2117164.34e-06-5.46-5.610NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2017-03-27.557 to 2017-04-02.483."
2017 FW90JPL Sentry15142101-211552.9e-05-6.50-6.800JPL: "Analysis based on 79 observations spanning 11.052 days (2017-Mar-25.34512 to 2017-Apr-05.39665)." Diameter approximately 0.008 km. from mean, weighted H=28.1.
NEODyS15142101-2117105.76e-05-6.20-6.760NEODyS: "Based on 78 optical observations (of which 6 are rejected as outliers) from 2017-03-25.346 to 2017-04-03.255."
2017 FL64JPL Sentry1602211122.5e-06-7.85-7.940JPL: "Analysis based on 16 observations spanning 14.044 days (2017-Mar-18.34675 to 2017-Apr-01.390345)." Diameter approximately 0.006 km. from mean, weighted H=28.6.
2017 FC3JPL Sentry15142053-205941.9e-07-5.82-6.060JPL: "Analysis based on 30 observations spanning 13.017 days (2017-Mar-19.32518 to 2017-Apr-01.34258)." Diameter approximately 0.067 km. from mean, weighted H=23.5.

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 5 April '17

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

1840Generated Traffic Report
1602Noted that JPL Sentry has updated its 2017 FL64 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FO128 risk assessment - see above
Noted that JPL Sentry has removed 2017 FW128 as an impact risk - see above
1514Noted that JPL Sentry has updated its 2017 FC3 risk assessment - see above
Noted that NEODyS has updated its 2017 FN128 risk assessment - see above
Noted that NEODyS has updated its 2017 FO128 risk assessment - see above
Noted that NEODyS has updated its 2017 FR102 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FW90 risk assessment - see above
Noted that NEODyS has updated its 2017 FW90 risk assessment - see above
Grabbed MPEC 2017-G52 - 2012 FA14 - see above
Grabbed MPEC 2017-G53 - Daily Orbit Update - see above
0228Grabbed MPEC 2017-G51 - 2017 GW4 - see above