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
2004-03-14 09:45:12 C 12 54 27.64 -08 05 35.6 d 703
2004-03-14 10:00:00 C 12 54 24.12 -08 05 00.2 d 703
2004-03-14 10:14:45 C 12 54 20.60 -08 04 25.0 d 703
2004-03-14 10:29:38 C 12 54 17.04 -08 03 48.9 d 703
2004-03-14 13:08:48 C 12 53 42.33 -07 56 48.3 r D85
2004-03-14 13:10:27 C 12 53 41.90 -07 56 44.6 r D85
2004-03-14 13:12:56 C 12 53 41.37 -07 56 38.9 r D85
2004-03-15 06:09:06 C 12 49 40.87 -07 15 32.2 r H41
2004-03-15 06:17:59 C 12 49 38.69 -07 15 10.7 r H41
2004-03-15 06:20:37 C 12 49 38.05 -07 15 03.7 r H41
2004-03-15 06:22:59 C 12 49 37.43 -07 14 57.4 r H41
2004-03-15 06:25:16 C 12 49 36.85 -07 14 51.8 r H41
2004-03-16 06:50:43 C 12 43 36.74 -06 11 41.7 d 703
2004-03-16 06:53:56 C 12 43 35.79 -06 11 33.3 16.4 c 704
2004-03-16 07:10:18 C 12 43 31.55 -06 10 50.1 16.4 c 704
2004-03-16 07:10:37 C 12 43 31.54 -06 10 48.8 d 703
2004-03-16 07:26:30 C 12 43 27.31 -06 10 07.2 16.5 c 704
2004-03-16 07:30:26 C 12 43 26.22 -06 09 55.2 d 703
2004-03-16 07:50:13 C 12 43 21.28 -06 09 04.2 d 703
2004-03-16 23:47:12 C 12 39 16.19 -05 25 58.8 r A16
2004-03-16 23:51:57 C 12 39 14.88 -05 25 47.5 r A16
2004-03-16 23:58:16 C 12 39 13.20 -05 25 29.3 r A16
2004-03-17 00:04:37 C 12 39 11.52 -05 25 12.1 r A16
2004-03-17 08:54:21 C 12 36 51.90 -05 00 37.6 c H41
2004-03-17 08:56:54 C 12 36 51.25 -05 00 29.9 c H41
2004-03-17 08:59:10 C 12 36 50.64 -05 00 24.2 c H41
2004-03-17 09:01:02 C 12 36 50.07 -05 00 18.4 c H41
2004-03-18 08:15:02 C 12 30 35.48 -03 53 42.9 15.7 c 704
2004-03-18 08:31:07 C 12 30 30.93 -03 52 55.7 15.8 c 704
2004-03-18 08:47:07 C 12 30 26.39 -03 52 08.7 16.0 c 704
2004-03-18 09:11:54 C 12 30 19.37 -03 50 56.2 15.9 c 704
2004-03-18 09:28:06 C 12 30 14.79 -03 50 08.7 16.0 c 704
2004-03-18 13:34:59 C 12 29 08.35 -03 37 21.1 r D85
2004-03-18 13:37:28 C 12 29 07.68 -03 37 14.0 r D85
2004-03-18 13:38:41 C 12 29 07.33 -03 37 10.3 r D85
2004-03-19 06:55:32 C 12 24 15.74 -02 45 58.3 15.8 c 704
2004-03-19 07:04:28 C 12 24 12.56 -02 45 36.3 r 750
2004-03-19 07:10:47 C 12 24 10.76 -02 45 17.5 r 750
2004-03-19 07:11:45 C 12 24 10.98 -02 45 08.8 16.1 c 704
2004-03-19 07:21:44 C 12 24 07.52 -02 44 43.8 r 750
2004-03-19 07:28:07 C 12 24 06.15 -02 44 19.1 16.0 c 704
2004-03-19 07:44:25 C 12 24 01.39 -02 43 29.4 15.9 c 704
2004-03-19 08:00:25 C 12 23 56.69 -02 42 40.6 16.1 c 704
2004-03-20 04:59:11 C 12 17 53.01 -01 37 30.4 15.6 d H72
2004-03-20 05:00:33 C 12 17 52.63 -01 37 25.8 16.0 d H72
2004-03-20 05:01:53 C 12 17 52.23 -01 37 21.8 15.9 d H72
2004-03-20 05:03:14 C 12 17 51.77 -01 37 17.8 15.9 d H72
2004-03-20 07:34:34 C 12 17 06.26 -01 29 25.1 r H41
2004-03-20 07:37:16 C 12 17 05.48 -01 29 16.7 r H41
2004-03-20 07:40:09 C 12 17 04.56 -01 29 07.2 r H41
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)