Contents  on 28 March '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 28 March '17

Nine objects reported inside ten LD

Today there are nine asteroids known to be inside ten lunar distances (LD) of Earth. Nearest are NHATS target 2017 FJ3, outbound from 3.57 to 3.91 LD, and 2017 FR91, inbound from 5.28 to 3.97 LD.

Earth passage I D ~Size Distance Today  Notes
1.70 LD March 232017 FZ2 16 m  8.02 to 9.88 LD NHATS target, risk
2.57 LD March 222017 FJ3 4 m  3.57 to 3.91 LD NHATS target
3.52 LD March 222017 FW90 9 m  6.17 to 6.99 LD NHATS target, risk - DOU
3.54 LD tomorrow2017 FR91 13 m  3.97 from 5.28 LD DOU
3.94 LD March 242017 FS91 19 m  7.22 to 8.70 LD DOU
4.19 LD March 262017 FL63 21 m  5.83 to 9.00 LD
5.75 LD yesterday2017 FF3 15 m  5.77 to 5.87 LD NHATS target
7.63 LD March 262015 TC25 4 m  7.70 to 7.83 LD radar/NHATS target, risk
9.04 LD yesterday2017 FK3 20 m  9.05 to 9.32 LD
Approaching
2.37 LD April 12017 FX90 20 m  < 10 LD tomorrow, risk - DOU
3.76 LD April 62017 FU64 60 m  < 10 LD April 4, risk - DOU
4.57 LD April 192014 JO25 812 m  < 10 LD April 18, radar target
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU
8.99 LD April 22017 FV 47 m  < 10 LD March 31, radar target, risk - DOU

This report was generated at 1821 UTC with follow-up in today's DOU MPEC for seven objects in the traffic table here plus five departed objects: 2017 DA38, risk-listed NHATS target 2017 FL64, and NHATS targets 2017 FQ63, 2017 FR, and 2017 DC36, plus astrometry from early March for 2017 EK and, from last June, for NHATS target 2013 NJ.



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 28 March '17

The MPC's NEO Confirmation Page has 82 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 82 objects listed. Of these, 29 were "one nighters." So far The Tracking News has counted a total of 95 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 28 March '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.


MPEC 2017-F163 - "16:26 UT" - 2014 SR350


MPEC 2017-F162 - "12:52 UT" - 1997 GC32


<< DOU on 28 Mar. '17 >>  MPEC 2017-F161 - "12:06 UT" - Daily Orbit Update

Observers  on 28 March '17

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPEC 2017-F161 -- 2017 CS, 2017 CM32, 2017 BX6, 2017 AQ20, 2016 RF40, 2016 FA4, 2015 DV215, 137170
T05ATLAS Haleakala in Hawaii, 12 in MPEC 2017-F161 -- 2017 CR32, 2016 SD, 2003 OV, 443103, 413002, 193178, 190166, 138404, 7341, 3199, 1864, 1036
160Castelmartini Obs. in Italy, 19 in MPEC 2017-F161 -- 2017 FR91, 2017 EK, 2017 CR32, 2017 AC5, 53319, 484795, 475665, 40267, 370307, 143404, 141018, 137170, 137158, 11398, 10636, 5626, 4055, 3103, 2329
703Catalina Sky Survey (CSS) in Arizona, 18 in MPEC 2017-F161 -- 2017 FV, 2017 FQ63, 2017 FL1, 2017 FE1, 2006 EC1, 85275, 484795, 40267, 226198, 154652, 142561, 138359, 137158, 10636, 7480, 4179, 4055, 2329
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 14 in MPECs 2017-F161 & 2017-F162 -- 2017 FY2, 2017 FX2, 2017 FJ1, 2017 FC3, 2017 EX2, 2017 ER2, 2017 DY108, 2017 DT35, 2017 DO34, 2017 DC36, 2017 DA38, 2016 WW9, 2016 UW41, 1997 GC32
W847David Gerdes in Michigan via DECam in Chile, 1 in MPEC 2017-F163 -- 2014 SR350
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 6 in MPEC 2017-F161 -- 2017 FY64, 2017 FX90, 2017 FW90, 2017 FO63, 2017 FK90, 2015 KN120
006Fabra Obs. in Spain, 2 in MPEC 2017-F161 -- 90075, 5604
Q60ISON Siding Spring Obs. in New South Wales, 1 in MPEC 2017-F161 -- 142781
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2017-F161 -- 2013 NJ
246KLENOT in the Czech Republic, 2 in MPEC 2017-F161 -- 2017 FV, 2017 FD1
W85LCOGT Cerro Tololo A in Chile, 2 in MPEC 2017-F161 -- 2017 FR, 2017 CS
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2017-F162 -- 1997 GC32
W92MASTER OAFA Obs., 1 in MPEC 2017-F161 -- 1998 HK1
474Mt. John Obs. in New Zealand, 5 in MPEC 2017-F161 -- 2017 FO90, 2017 FO63, 2017 FH1, 2017 FD1, 2017 DS36
G96Mt. Lemmon Survey (MLS) in Arizona, 34 in MPEC 2017-F161 -- 2017 FY, 2017 FV2, 2017 FU64, 2017 FT, 2017 FR64, 2017 FR, 2017 FQ63, 2017 FQ2, 2017 FO2, 2017 FM63, 2017 FH3, 2017 EW2, 2017 EA3, 2017 DS35, 2016 LE9, 2004 SW55, 2003 FR6, 2000 UW13, 85275, 484506, 465402, 388838, 317255, 274138, 235086, 190161, 186823, 162063, 141531, 138155, 137158, 7480, 7474, 4055
A13Naef Obs. in Switzerland, 3 in MPEC 2017-F161 -- 2017 FE1, 10636, 5646
J69North Obs. in England, 2 in MPEC 2017-F161 -- 484795, 11398
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2017-F161 -- 90075
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-F161 -- 2017 AP20
F51Pan-STARRS 1 (PS1) in Hawaii, 38 in MPECs 2017-F161 & 2017-F162 -- 2017 FU, 2017 FQ63, 2017 FO90, 2017 FH63, 2017 FD65, 2017 EV2, 2017 EH4, 2017 EA3, 2017 DC38, 2014 SO143, 2012 EC, 1999 HD1, 1997 GC32, 85490, 85275, 485110, 480934, 432226, 422787, 408792, 391033, 390929, 357621, 308899, 281365, 249595, 242187, 235086, 206378, 164222, 10636, 7358, 5646, 4954, 4503, 4055, 2329, 1864
A53Peschiera del Garda Obs. in Italy, 2 in MPEC 2017-F161 -- 2017 EN, 2017 AC5
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 23 in MPEC 2017-F161 -- 2017 FU64, 2017 EN, 2017 DT37, 2017 DC38, 2017 CS, 2017 CR32, 2017 AP20, 2017 AC5, 2016 DP, 2013 RM43, 2006 UM, 2006 EC1, 1998 HK1, 90075, 89830, 484795, 405427, 370702, 252091, 250620, 143404, 11398, 5604
D29Purple Mtn. Obs. Xuyi Station in China, 5 in MPEC 2017-F161 -- 2017 BG85, 2017 AC5, 274138, 154144, 144411
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-F161 -- 2017 ES2
691Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2017-F161 -- 2017 FY64, 2017 FN90, 2017 FH1, 2017 EH, 2017 BL6, 2016 SD, 2015 YE18, 2015 FN118, 2014 SO143, 2010 GA7, 252091
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2017-F161 -- 2017 FL64, 2017 FK90, 2013 TS132, 2004 CO49
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-F161 -- 2017 EW2
926Tenagra II Obs. in Arizona, 4 in MPEC 2017-F161 -- 2017 FS91, 2017 FL1, 2016 WO1, 2016 VH3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPEC 2017-F161 -- 2017 FG3, 2017 BK123, 2016 XQ23, 2016 XM
C51WISE in Earth polar orbit, 5 in MPEC 2017-F161 -- 2017 FX64, 2016 WF9, 108519, 7888, 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 March '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 FX90JPL Sentry1639R E M O V E DJPL: Risk listing removed at 1602 UTC.
2017 FW90JPL Sentry16392101-210341.2e-05-6.77-7.080JPL: "Analysis based on 37 observations spanning 2.5651 days (2017-Mar-25.34512 to 2017-Mar-27.910254)." Diameter approximately 0.009 km. from mean, weighted H=27.9.
NEODyS15212101-211791.31e-05-6.73-7.10NEODyS: "Based on 37 optical observations (of which 3 are rejected as outliers) from 2017-03-25.346 to 2017-03-27.248."
2017 FK90NEODyS1521R E M O V E D-
2017 FY64NEODyS1521R E M O V E D-
2017 FU64JPL Sentry1639204313.9e-09-7.34-7.340JPL: "Analysis based on 33 observations spanning 6.9956 days (2017-Mar-21.35113 to 2017-Mar-28.34674)." Diameter approximately 0.059 km. from mean, weighted H=23.8.
2017 FL64NEODyS18002111-211531.94e-07-8.96-9.050NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2017-03-18.348 to 2017-03-28.263."
JPL Sentry1702211122.0e-06-7.94-8.220JPL: "Analysis based on 12 observations spanning 9.9152 days (2017-Mar-18.34675 to 2017-Mar-28.26198)." Diameter approximately 0.006 km. from mean, weighted H=28.6.
2017 FO63NEODyS18002097-210822.43e-06-4.59-4.590NEODyS #2 for the day: "Based on 47 optical observations (of which 0 are rejected as outliers) from 2017-03-21.391 to 2017-03-27.870."
JPL Sentry16392097-210422.2e-06-4.63-4.630JPL: "Analysis based on 47 observations spanning 6.4793 days (2017-Mar-21.38988 to 2017-Mar-27.869222)." Diameter approximately 0.071 km. from mean, weighted H=23.4.
2017 FD3NEODyS1521206312.72e-09-9.84-9.840NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2017-03-19.440 to 2017-03-27.455."
2017 FC3NEODyS18002047-2060111.73e-06-4.77-4.810NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2017-03-19.326 to 2017-03-27.222."
JPL Sentry16392044-2060111.1e-06-4.99-5.220JPL: "Analysis based on 20 observations spanning 7.8961 days (2017-Mar-19.32518 to 2017-Mar-27.22132)." Diameter approximately 0.067 km. from mean, weighted H=23.5.
2017 FVJPL Sentry1639211311.2e-07-6.92-6.920JPL: "Analysis based on 63 observations spanning 10.981 days (2017-Mar-17.26524 to 2017-Mar-28.24658)." Diameter approximately 0.041 km. from mean, weighted H=24.6.
NEODyS15212101-2117122.41e-07-6.63-6.940NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2017-03-17.266 to 2017-03-26.831."

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 28 March '17

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

1821Generated Traffic Report
1800Noted that NEODyS has updated its 2017 FC3 risk assessment - see above
Noted that NEODyS has updated its 2017 FL64 risk assessment - see above
Noted that NEODyS has updated its 2017 FO63 risk assessment - see above
1702Noted that JPL Sentry has updated its 2017 FL64 risk assessment - see above
1639Noted that JPL Sentry has updated its 2017 FC3 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FO63 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FU64 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FV risk assessment - see above
Noted that JPL Sentry has updated its 2017 FW90 risk assessment - see above
Noted that JPL Sentry has removed 2017 FX90 as an impact risk - see above
Grabbed MPEC 2017-F163 - 2014 SR350 - see above
1521Noted that NEODyS has updated its 2017 FD3 risk assessment - see above
Noted that NEODyS has removed 2017 FK90 as an impact risk - see above
Noted that NEODyS has updated its 2017 FO63 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
Noted that NEODyS has removed 2017 FY64 as an impact risk - see above
Grabbed MPEC 2017-F161 - Daily Orbit Update - see above
Grabbed MPEC 2017-F162 - 1997 GC32 - see above