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
1999-03-26 20:27:16 C 17 46 46.53 -05 18 27.7 18.9 327
1999-03-26 20:30:55 C 17 46 47.91 -05 18 14.1 327
1999-03-27 01:14:59 C 17 48 44.35 -05 02 44.6 d 046
1999-03-27 01:16:20 C 17 48 44.89 -05 02 40.5 d 046
1999-03-27 01:17:28 C 17 48 45.35 -05 02 36.9 d 046
1999-03-27 01:18:36 C 17 48 45.83 -05 02 33.2 d 046
1999-03-27 01:19:47 C 17 48 46.30 -05 02 28.7 d 046
1999-03-27 02:49:13 C 17 49 22.47 -04 57 32.3 557
1999-03-27 02:50:15 C 17 49 22.88 -04 57 28.9 557
1999-03-27 02:56:45 C 17 49 25.53 -04 57 07.2 557
1999-03-27 02:57:36 C 17 49 25.88 -04 57 04.5 557
1999-03-27 02:58:29 C 17 49 26.22 -04 57 01.5 557
1999-03-27 02:59:21 C 17 49 26.57 -04 56 58.7 557
1999-03-27 18:52:07 C 17 56 10.88 -04 01 09.1 z 428
1999-03-27 19:02:59 C 17 56 15.54 -04 00 30.6 z 428
1999-03-27 19:27:40 C 17 56 26.80 -03 59 49.1 z 402
1999-03-27 20:00:42 C 17 56 40.89 -03 57 50.5 z 402
2002-02-19 16:17:55 C 11 25 15.43 -32 19 51.0 e 413
2002-02-19 16:19:43 C 11 25 14.60 -32 19 44.3 e 413
2002-02-19 16:21:31 C 11 25 13.77 -32 19 37.6 e 413
2002-02-25 05:01:27 C 10 29 37.00 -22 55 48.3 c 807
2002-03-04 20:38:26 C 09 32 48.04 -09 31 49.5 c 215
2002-03-04 20:39:39 C 09 32 47.72 -09 31 44.9 c 215
2002-03-04 20:40:11 C 09 32 47.60 -09 31 42.6 c 215
2002-03-05 21:48:23 C 09 26 51.44 -07 54 05.4 c 118
2002-03-05 21:54:25 C 09 26 50.02 -07 53 42.3 c 118
2002-03-08 20:32:43 C 09 12 17.75 -03 42 20.6 c 560
2002-03-08 20:35:44 C 09 12 17.18 -03 42 09.6 c 560
2002-03-08 20:40:43 C 09 12 16.29 -03 41 54.2 c 560
2002-03-08 20:50:34 C 09 12 14.28 -03 41 21.2 c 560
2002-03-10 04:31:43 C 09 06 38.33 -01 59 44.2 16.6 c 704
2002-03-10 04:51:29 C 09 06 34.84 -01 58 43.5 17.0 c 704
2002-03-10 05:12:58 C 09 06 31.05 -01 57 36.9 16.9 c 704
2002-03-10 05:37:45 C 09 06 26.70 -01 56 20.1 17.0 c 704
2002-03-10 05:57:10 C 09 06 23.28 -01 55 20.1 17.0 c 704
2002-03-10 19:07:28 C 09 04 14.65 -01 15 21.8 151
2002-03-10 19:09:04 C 09 04 14.37 -01 15 16.8 151
2002-03-10 19:10:31 C 09 04 14.14 -01 15 12.8 151
2002-03-10 19:13:35 C 09 04 13.62 -01 15 03.0 151
2002-03-10 19:15:05 C 09 04 13.38 -01 14 58.6 151
2002-03-10 19:16:26 C 09 04 13.16 -01 14 54.6 151
2002-03-10 21:05:11 C 09 03 54.95 -01 09 28.5 c 436
2002-03-10 21:18:25 C 09 03 52.78 -01 08 49.1 c 436
2002-03-10 21:24:33 C 09 03 51.71 -01 08 30.7 c 436
2002-03-10 21:30:42 C 09 03 50.70 -01 08 11.9 c 436
2002-03-10 21:36:50 C 09 03 49.61 -01 07 52.9 c 436
2002-03-10 21:49:06 C 09 03 47.56 -01 07 17.4 c 436
2002-03-12 03:48:55 C 08 59 14.43 +00 19 15.5 c 670
2002-03-12 04:28:02 C 08 59 07.99 +00 21 04.8 16.8 c 704
2002-03-12 04:49:20 C 08 59 04.76 +00 22 04.1 16.9 c 704
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)