85953 (1999 FK21)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.7030446163 ± 2.00e+00
Semi-major axis (a)0.7388810751 AU ± 3.00e+00
Inclination (i)12.59565879° ± 4.00e+00
Long. of Asc. Node (Ω)180.43171176° ± 5.00e+00
Arg. of Perihelion (ω)172.42809574° ± 6.00e+00
Mean Anomaly (M)258.98007896° ± 1.28e-05
Mean Motion (n)1.5518525758°/day ± 9.45e+00
Perihelion dist (q)0.21941471 AU ± 1.73e+00
Aphelion dist (Q)1.25834744 AU ± 5.32e+00
Orbital Period0.63512881 yr ± 3.87e+00
NGA Modelr2
A2-1.48932034e-06 AU/d²
Physical Parameters
H (abs. magnitude)18.09
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-26
RMS Residual0.174″
Uncertainty0
Orbit TypeAten
MOID0.070855 AU
Observations Used1870
Gaia Obs Used16
Oppositions26
Arc Total1971-2017
First Observation Used1971-03-26
Last Observation Used2025-04-18
Observations (2162)
Date Type RA Dec Mag Band Observatory
2018-04-10 02:21:48 C 10 23 23.35 +38 33 13.2 u 850
2018-04-10 19:39:54 C 10 09 39.66 +39 51 24.0 15.9 r 238
2018-04-10 19:42:30 C 10 09 37.57 +39 51 35.0 16.1 r 238
2018-04-10 19:44:36 C 10 09 35.88 +39 51 43.8 16.1 r 238
2018-04-11 06:13:20 C 10 01 12.60 +40 35 13.7 q 850
2018-04-11 06:33:45 C 10 00 56.20 +40 36 32.2 q 850
2018-04-11 06:54:42 C 10 00 39.41 +40 37 52.2 q 850
2018-04-11 07:15:12 C 10 00 23.07 +40 39 09.0 q 850
2018-04-11 19:11:53 C 09 51 01.35 +41 24 16.5 U K74
2018-04-11 19:19:00 C 09 50 55.62 +41 24 42.0 U K74
2018-04-11 19:24:33 C 09 50 51.15 +41 25 01.7 U K74
2018-04-11 19:26:06 C 09 50 49.90 +41 25 07.3 U K74
2018-04-12 00:00:30 S 09 47 14.94 +41 41 13.8 L C51
2018-04-12 01:34:45 S 09 46 00.87 +41 46 36.9 L C51
2018-04-12 04:11:09 C 09 43 54.29 +41 55 33.7 u 850
2018-04-12 04:31:21 C 09 43 38.12 +41 56 39.0 u 850
2018-04-12 04:42:31 S 09 43 33.54 +41 57 11.4 L C51
2018-04-12 04:52:33 C 09 43 21.17 +41 57 47.3 u 850
2018-04-12 05:35:00 C 09 42 48.85 +42 00 15.0 U 703
2018-04-12 05:42:42 C 09 42 42.63 +42 00 40.8 U 703
2018-04-12 05:50:23 C 09 42 36.49 +42 01 04.4 U 703
2018-04-12 05:58:05 C 09 42 30.32 +42 01 28.9 U 703
2018-04-14 23:49:45 C 08 53 05.42 +44 39 08.6 U Z80
2018-04-14 23:52:53 C 08 53 03.20 +44 39 14.2 U Z80
2018-04-14 23:56:01 C 08 53 00.81 +44 39 20.0 U Z80
2018-04-15 04:46:02 C 08 49 37.27 +44 47 18.9 U 703
2018-04-15 04:53:46 C 08 49 31.70 +44 47 29.7 U 703
2018-04-15 05:01:30 C 08 49 26.17 +44 47 41.0 U 703
2018-04-15 05:09:14 C 08 49 20.64 +44 47 51.2 U 703
2018-04-19 04:09:18 C 07 50 16.19 +45 53 53.5 U 703
2018-04-19 04:17:04 C 07 50 11.87 +45 53 53.6 U 703
2018-04-19 04:32:38 C 07 50 03.28 +45 53 53.3 U 703
2018-04-24 06:12:20 C 06 55 03.64 +45 11 54.3 U T05
2018-04-24 06:17:46 C 06 55 01.58 +45 11 51.6 U T05
2018-04-24 06:30:40 C 06 54 56.63 +45 11 42.0 U T05
2018-04-24 06:43:37 C 06 54 51.66 +45 11 32.1 U T05
2018-04-26 03:15:46 C 06 39 12.83 +44 41 09.3 U 703
2018-04-26 03:24:02 C 06 39 10.18 +44 41 03.0 U 703
2018-04-26 03:32:20 C 06 39 07.29 +44 40 56.0 U 703
2020-01-28 14:39:13 C 15 07 40.011 -18 06 38.54 U F51
2020-01-28 14:51:19 C 15 07 41.284 -18 06 40.62 U F51
2020-01-28 15:03:23 C 15 07 42.544 -18 06 42.70 U F51
2020-01-28 15:15:24 C 15 07 43.800 -18 06 44.77 U F51
2021-02-18 06:22:53 C 04 26 48.50 -42 01 58.4 V T08
2021-02-18 06:27:31 C 04 26 51.93 -42 01 15.7 V T08
2021-02-18 06:37:29 C 04 26 59.27 -41 59 44.1 V T08
2021-02-20 06:37:58 C 04 58 38.58 -34 40 21.6 V T05
2021-02-20 06:44:34 C 04 58 42.24 -34 39 21.4 V T05
2021-02-20 06:52:31 C 04 58 46.60 -34 38 09.3 V T05
2021-02-22 07:17:46 C 05 22 50.32 -27 38 30.9 V T08
Radar Observations (3)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2025-04-04 05:20:00 91879923.36 2 us 8560 -14 -14
2025-04-07 07:40:00 136680.959 0.4 Hz 8560 -14 -14
2025-04-07 08:10:00 81139927.01 2 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m)