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
2004-04-09 19:51:01 C 09 39 45.39 +23 27 45.5 r 240
2004-04-09 19:53:42 C 09 39 44.65 +23 27 50.7 r 240
2004-04-09 19:55:02 C 09 39 44.26 +23 27 53.5 r 240
2004-04-09 19:58:23 C 09 39 43.36 +23 28 00.2 r 240
2004-04-09 20:04:24 C 09 39 41.68 +23 28 11.8 r 240
2004-04-10 22:26:41 C 09 32 43.29 +24 17 46.4 o 084
2004-04-11 19:47:26 C 09 27 18.71 +24 55 33.6 c A48
2004-04-11 19:51:34 C 09 27 17.72 +24 55 40.3 c A48
2004-04-11 19:55:41 C 09 27 16.65 +24 55 47.1 c A48
2004-04-11 19:59:47 C 09 27 15.55 +24 55 54.4 c A48
2004-04-11 20:02:36 C 09 27 14.82 +24 55 56.2 c A35
2004-04-11 20:03:55 C 09 27 14.55 +24 56 00.7 c A48
2004-04-11 20:04:26 C 09 27 14.36 +24 55 59.4 c A35
2004-04-11 20:08:07 C 09 27 13.42 +24 56 05.5 c A35
2004-04-11 21:27:47 C 09 26 53.04 +24 58 22.3 r 204
2004-04-11 21:30:24 C 09 26 52.36 +24 58 26.8 r 204
2004-04-11 21:33:16 C 09 26 51.64 +24 58 31.5 r 204
2004-04-11 21:35:39 C 09 26 51.02 +24 58 35.5 r 204
2004-04-12 23:30:50 C 09 20 31.35 +25 40 48.6 o 084
2004-04-13 21:28:16 C 09 15 22.67 +26 14 19.7 o 084
2004-04-14 04:27:27 C 09 13 46.99 +26 24 48.2 17.4 c 704
2004-04-14 04:42:52 C 09 13 43.34 +26 25 10.0 17.5 c 704
2004-04-14 04:57:20 C 09 13 39.99 +26 25 30.3 17.9 c 704
2004-04-14 04:58:16 C 09 13 39.74 +26 25 31.9 17.5 c 704
2004-04-14 05:12:44 C 09 13 36.42 +26 25 52.7 19.1 c 704
2004-04-14 05:20:41 C 09 13 34.07 +26 26 00.6 r H41
2004-04-14 05:24:16 C 09 13 33.33 +26 26 05.2 r H41
2004-04-14 05:27:24 C 09 13 32.64 +26 26 09.6 r H41
2004-04-14 05:28:16 C 09 13 32.80 +26 26 14.3 18.1 c 704
2004-04-14 05:30:03 C 09 13 31.98 +26 26 12.4 r H41
2004-04-15 22:44:45 C 09 04 30.04 +27 21 59.3 o 084
2004-04-16 20:35:13 C 08 59 58.47 +27 49 01.9 o 084
2004-04-17 20:46:15 C 08 55 09.16 +28 16 58.5 o 084
2004-04-18 21:00:46 C 08 50 31.07 +28 43 04.8 o 084
2004-04-19 20:59:07 C 08 46 07.32 +29 07 11.3 o 084
2004-04-21 19:30:50 C 08 38 05.18 +29 49 47.0 c 434
2004-04-21 19:35:21 C 08 38 04.42 +29 49 49.8 c 434
2004-04-21 19:37:41 C 08 38 04.03 +29 49 53.6 c 434
2004-04-21 20:00:21 C 08 38 00.18 +29 50 11.2 c A48
2004-04-21 20:02:26 C 08 37 59.82 +29 50 12.7 c A48
2004-04-21 20:04:31 C 08 37 59.45 +29 50 14.6 c A48
2004-04-21 20:06:38 C 08 37 59.08 +29 50 15.9 c A48
2004-04-22 20:44:41 C 08 33 58.07 +30 10 29.2 o 084
2004-04-23 03:26:22 C 08 32 54.44 +30 16 02.7 18.9 c 704
2004-04-23 03:42:07 C 08 32 51.86 +30 16 14.2 18.8 c 704
2004-04-23 03:57:38 C 08 32 49.35 +30 16 26.4 18.6 c 704
2004-04-24 20:56:56 C 08 26 32.70 +30 46 43.6 o 084
2004-04-25 20:38:09 C 08 23 05.07 +31 03 00.2 o 084
2007-03-06 19:35:20 C 04 56 48.75 +00 42 26.2 c J92
2007-03-06 20:12:19 C 04 57 00.20 +00 43 59.1 c J92
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)