Contents  on 23 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 23 March '17

Nine objects reported inside ten LD

There are nine Solar-System small bodies known to be flying within ten lunar distances (LD) of Earth today. Nearest of these, inside Earth's SOI, is risk-listed 2017 FZ2, which comes its closest to Earth on this passage, reaching 1.70 LD at 2041 UTC.

Earth passage I D ~Size Distance Today  Notes
0.16 LD March 202017 FN1 3 m  8.57 to 12.61 LD exits ten LD, intruder, risk
0.33 LD March 202017 FM1 4 m  4.72 to 6.99 LD intruder
1.70 LD today2017 FZ2 15 m  1.70 LD risk, inside SOI, Earth closest at 2041 UTC
1.74 LD March 202017 FK 11 m  5.79 to 7.92 LD NHATS target
1.98 LD March 212017 FJ 8 m  3.47 to 5.31 LD NHATS target
2.57 LD yesterday2017 FJ3 4 m  2.57 to 2.63 LD
5.75 LD March 272017 FF3 14 m  6.09 from 6.33 LD DOU
7.63 LD March 262015 TC25 4 m  7.87 from 8.07 LD radar/NHATS target, risk
9.29 LD March 202017 FR63 22 m  9.81 to 10.29 LD NEW, exits ten LD - MPEC
Approaching
4.16 LD March 262017 FL63 21 m  < 10 LD tomorrow, NEW - MPEC
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
9.03 LD April 22017 FV 47 m  < 10 LD March 31, radar target, risk - DOU
9.08 LD March 272017 FK3 21 m  < 10 LD March 25

This report was generated at 1940 UTC with two discoveries marked "NEW" in the traffic table here plus already departed 2017 FQ63 (MPEC), which passed us at 7.37 LD on March 17th. Today's DOU MPEC has follow-up for three objects in the traffic table and for departed 2017 FW2, plus astrometry from October 2012 for tiny NHATS target 2012 TC4, which was an intruder in that year and will again come very close in October this year, when it will be a 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 23 March '17

The MPC's NEO Confirmation Page has 97 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 97 objects listed. Of these, 31 were "one nighters." So far The Tracking News has counted a total of 122 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 March '17

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been eighteen MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-F98 - "18:50 UT" - 2015 PL312


MPEC 2017-F97 - "18:24 UT" - 2014 SQ350


MPEC 2017-F96 - "18:20 UT" - 2014 QE442


MPEC 2017-F95 - "17:52 UT" - 2015 RS245


MPEC 2017-F94 - "17:13 UT" - 2017 FQ63


MPEC 2017-F93 - "17:10 UT" - 2017 FE63


MPEC 2017-F92 - "17:05 UT" - 2017 FR63


MPEC 2017-F91 - "17:01 UT" - 2017 FP63


MPEC 2017-F90 - "16:58 UT" - 2017 FO63


MPEC 2017-F89 - "16:54 UT" - 2017 FN63


MPEC 2017-F88 - "16:51 UT" - 2017 FM63


MPEC 2017-F87 - "16:47 UT" - 2017 FL63


MPEC 2017-F86 - "16:43 UT" - 2017 FK63


MPEC 2017-F85 - "16:39 UT" - 2017 FJ63


MPEC 2017-F84 - "16:27 UT" - 2017 FH63


MPEC 2017-F83 - "16:22 UT" - 2017 FG63


MPEC 2017-F82 - "16:19 UT" - 2017 FF63


<< DOU on 23 Mar. '17 >>  MPEC 2017-F81 - "12:05 UT" - Daily Orbit Update

Observers  on 23 March '17

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPECs 2017-F81, 2017-F83, 2017-F86, 2017-F87, 2017-F88 & 2017-F90 -- 2017 FO63, 2017 FM63, 2017 FL63, 2017 FK63, 2017 FG63, 2017 FG3, 2017 FE3, 2017 FB1, 2016 PQ39, 2015 FF37, 2006 UM, 143404
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2017-F81 -- 11398, 3103
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2017-F92 -- 2017 FR63
160Castelmartini Obs. in Italy, 17 in MPEC 2017-F81 -- 2017 CR32, 2017 AC5, 2006 EC1, 484795, 388838, 370307, 274138, 248083, 175189, 154244, 143404, 141018, 138359, 5626, 4055, 3552, 2329
703Catalina Sky Survey (CSS) in Arizona, 12 in MPEC 2017-F81 -- 2006 UM, 89830, 486607, 484517, 483662, 448003, 252793, 205378, 13651, 11398, 8176, 3103
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2017-F82, 2017-F89 & 2017-F90 -- 2017 FO63, 2017 FN63, 2017 FF63
W847David Gerdes in Michigan via DECam in Chile, 4 in MPECs 2017-F95, 2017-F96, 2017-F97 & 2017-F98 -- 2015 RS245, 2015 PL312, 2014 SQ350, 2014 QE442
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-F81 -- 2017 CS
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-F85 -- 2017 FJ63
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2017-F91 -- 2017 FP63
K91LCOGT Sutherland A in South Africa, 2 in MPECs 2017-F84 & 2017-F85 -- 2017 FJ63, 2017 FH63
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-F82 -- 2017 FF63
Z21LCOGT Tenerife Aqawan A#1 in the Canary Islands, 1 in MPEC 2017-F81 -- 2017 AC5
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2017-F81, 2017-F83, 2017-F86, 2017-F87, 2017-F92 & 2017-F93 -- 2017 FR63, 2017 FL63, 2017 FK63, 2017 FG63, 2017 FE63, 2012 TC4
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-F86 -- 2017 FK63
G96Mt. Lemmon Survey (MLS) in Arizona, 25 in MPECs 2017-F81, 2017-F82, 2017-F83, 2017-F86, 2017-F87, 2017-F92 & 2017-F93 -- 2017 FR63, 2017 FL63, 2017 FK63, 2017 FG63, 2017 FF63, 2017 FE63, 2017 EW2, 2017 EB3, 2017 DS35, 2016 FA4, 2013 RM43, 2006 UM, 2006 EC1, 485051, 483509, 483408, 477490, 391275, 363069, 328059, 205378, 173561, 137158, 13651, 2329
F51Pan-STARRS 1 (PS1) in Hawaii, 35 in MPECs 2017-F81, 2017-F84, 2017-F85, 2017-F88, 2017-F89, 2017-F90, 2017-F91, 2017-F93 & 2017-F94 -- 2017 FQ63, 2017 FP63, 2017 FP2, 2017 FO63, 2017 FO2, 2017 FN63, 2017 FM63, 2017 FJ63, 2017 FH63, 2017 FE63, 2017 FC1, 2017 FB1, 2017 EX2, 2017 EO22, 2016 MK1, 2011 QP96, 2008 EN6, 484506, 477490, 465402, 390929, 363069, 361532, 354876, 343158, 308899, 288914, 205378, 190758, 175114, 162063, 144898, 142561, 138155, 5879
W25RMS Obs., 6 in MPECs 2017-F81 & 2017-F90 -- 2017 FQ, 2017 FO63, 2017 FL1, 2017 DC38, 154652, 138155
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-F81 -- 143404
691Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2017-F81, 2017-F82 & 2017-F87 -- 2017 FW2, 2017 FL63, 2017 FF63, 2017 DC38, 2017 CS, 5189
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2017-F81, 2017-F82, 2017-F85, 2017-F88, 2017-F89, 2017-F91 & 2017-F93 -- 2017 FP63, 2017 FN63, 2017 FM63, 2017 FJ63, 2017 FF63, 2017 FE63, 2009 SP
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-F81 -- 4055
I52Steward Obs. Mt. Lemmon Station in Arizona, 14 in MPECs 2017-F81, 2017-F83, 2017-F86, 2017-F87, 2017-F89, 2017-F90, 2017-F91 & 2017-F92 -- 2017 FY, 2017 FV, 2017 FR63, 2017 FQ, 2017 FP63, 2017 FO63, 2017 FN63, 2017 FL63, 2017 FK63, 2017 FJ1, 2017 FH1, 2017 FG63, 2017 FE1, 2017 FC1
926Tenagra II Obs. in Arizona, 11 in MPECs 2017-F81, 2017-F83, 2017-F84, 2017-F86, 2017-F87, 2017-F89, 2017-F91, 2017-F92 & 2017-F94 -- 2017 FY, 2017 FR63, 2017 FQ63, 2017 FQ, 2017 FP63, 2017 FN63, 2017 FL63, 2017 FK63, 2017 FH63, 2017 FG63, 2017 FF3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-F81 -- 2012 PS17
C51WISE in Earth polar orbit, 1 in MPEC 2017-F81 -- 4179
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 March '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 FO63JPL Sentry19302073-2108106.1e-07-5.29-5.490JPL: "Analysis based on 17 observations spanning 1.8449 days (2017-Mar-21.38988 to 2017-Mar-23.234808)." Diameter approximately 0.066 km. from mean, weighted H=23.5.
2017 FG3NEODyS1711R E M O V E DNEODyS #2 for the day
JPL Sentry1538R E M O V E DJPL: Risk listing removed at 1517 UTC.
2017 FD3NEODyS1538206613.45e-09-9.75-9.750NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2017-03-19.440 to 2017-03-22.465."
2017 FC3NEODyS15382027-21142311.81e-05-3.86-4.760NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2017-03-19.326 to 2017-03-21.277."
2017 FA3NEODyS15382114-211623.04e-08-9.28-9.480NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2017-03-19.343 to 2017-03-22.244."
2017 FN1NEODyS15382033-2105112.61e-04-5.62-5.650NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2017-03-20.357 to 2017-03-20.830."
2017 FE1JPL Sentry1538208611.1e-09-6.88-6.880JPL: "Analysis based on 38 observations spanning 3.9872 days (2017-Mar-18.24314 to 2017-Mar-22.23032)." Diameter approximately 0.300 km. from mean, weighted H=20.2.
2017 FC1NEODyS1830206416.32e-06-5.65-5.650NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2017-03-14.416 to 2017-03-22.283."
JPL Sentry1601206417.1e-07-6.60-6.600JPL: "Analysis based on 41 observations spanning 7.8675 days (2017-Mar-14.415078 to 2017-Mar-22.28261)." Diameter approximately 0.024 km. from mean, weighted H=25.8.
2017 FB1NEODyS18302101-2111101.47e-06-5.00-5.280NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2017-03-18.208 to 2017-03-22.351."
JPL Sentry15382101-2114111.5e-06-4.99-5.330JPL: "Analysis based on 31 observations spanning 4.1429 days (2017-Mar-18.20739 to 2017-Mar-22.350291)." Diameter approximately 0.073 km. from mean, weighted H=23.3.
2017 FVJPL Sentry15382100-211596.3e-06-5.15-5.450JPL: "Analysis based on 26 observations spanning 5.0153 days (2017-Mar-17.26524 to 2017-Mar-22.28056)." Diameter approximately 0.042 km. from mean, weighted H=24.5.
2012 TC4JPL Sentry17112020-2116919.1e-05-4.68-5.710JPL: "Analysis based on 311 observations spanning 7.2808 days (2012-Oct-04.467661 to 2012-Oct-11.74842)." Diameter approximately 0.015 km. from mean, weighted H=26.7.

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 March '17

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

1940Generated Traffic Report
1930Noted that JPL Sentry has posted 2017 FO63 as an impact risk - see above
1903Grabbed MPEC 2017-F98 - 2015 PL312 - see above
1830Noted that NEODyS has updated its 2017 FB1 risk assessment - see above
Noted that NEODyS has updated its 2017 FC1 risk assessment - see above
Grabbed MPEC 2017-F96 - 2014 QE442 - see above
Grabbed MPEC 2017-F97 - 2014 SQ350 - see above
1802Grabbed MPEC 2017-F95 - 2015 RS245 - see above
1735Grabbed MPEC 2017-F94 - 2017 FQ63 - see above
1711Noted that JPL Sentry has updated its 2012 TC4 risk assessment - see above
Noted that NEODyS has removed 2017 FG3 as an impact risk - see above
Grabbed MPEC 2017-F82 - 2017 FF63 - see above
Grabbed MPEC 2017-F83 - 2017 FG63 - see above
Grabbed MPEC 2017-F84 - 2017 FH63 - see above
Grabbed MPEC 2017-F85 - 2017 FJ63 - see above
Grabbed MPEC 2017-F86 - 2017 FK63 - see above
Grabbed MPEC 2017-F87 - 2017 FL63 - see above
Grabbed MPEC 2017-F88 - 2017 FM63 - see above
Grabbed MPEC 2017-F89 - 2017 FN63 - see above
Grabbed MPEC 2017-F90 - 2017 FO63 - see above
Grabbed MPEC 2017-F91 - 2017 FP63 - see above
Grabbed MPEC 2017-F92 - 2017 FR63 - see above
Grabbed MPEC 2017-F93 - 2017 FE63 - see above
1601Noted that JPL Sentry has updated its 2017 FC1 risk assessment - see above
1538Noted that NEODyS has posted 2017 FA3 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 FB1 risk assessment - see above
Noted that NEODyS has posted 2017 FC3 as an impact risk - see above
Noted that NEODyS has posted 2017 FD3 as an impact risk - see above
Noted that JPL Sentry has posted 2017 FE1 as an impact risk - see above
Noted that JPL Sentry has removed 2017 FG3 as an impact risk - see above
Noted that NEODyS has posted 2017 FG3 as an impact risk - see above
Noted that NEODyS has updated its 2017 FN1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FV risk assessment - see above
Grabbed MPEC 2017-F81 - Daily Orbit Update - see above