16816 (1997 UF9)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.6037214479 ± 1.59e-08
Semi-major axis (a)1.4425362245 AU ± 1.02e-09
Inclination (i)25.91743206° ± 1.77e-06
Long. of Asc. Node (Ω)37.14160767° ± 1.14e-06
Arg. of Perihelion (ω)157.99634538° ± 1.37e-06
Mean Anomaly (M)323.06228385° ± 2.42e-06
Mean Motion (n)0.5688819894°/day ± 6.04e-10
Perihelion dist (q)0.57164617 AU ± 2.29e-08
Aphelion dist (Q)2.31342628 AU ± 2.30e-08
Orbital Period1.73256721 yr ± 1.84e-09
Physical Parameters
H (abs. magnitude)16.24
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.078″
Uncertainty0
Orbit TypeApollo
MOID0.379852 AU
Observations Used1692
Gaia Obs Used91
Oppositions8
Arc Total1997-2025
First Observation Used1997-10-29
Last Observation Used2025-12-20
Observations (1777)
Date Type RA Dec Mag Band Observatory
2023-10-31 14:33:42 C 02 39 23.59 +18 52 53.9 V O18
2023-10-31 14:43:37 C 02 39 22.55 +18 52 54.9 V O18
2023-10-31 14:53:38 C 02 39 21.51 +18 52 55.9 V O18
2023-11-01 11:17:45 C 02 37 15.094 +18 54 43.78 V T05
2023-11-01 11:22:20 C 02 37 14.616 +18 54 44.10 V T05
2023-11-01 11:30:56 C 02 37 13.747 +18 54 44.24 V T05
2023-11-01 11:46:58 C 02 37 12.010 +18 54 45.76 V T05
2023-11-03 08:29:07 C 02 32 31.463 +18 58 06.17 V 703
2023-11-03 08:36:30 C 02 32 30.671 +18 58 06.64 V 703
2023-11-03 08:43:53 C 02 32 29.886 +18 58 07.21 V 703
2023-11-03 08:51:16 C 02 32 29.108 +18 58 07.79 V 703
2023-11-03 10:50:57 C 02 32 16.574 +18 58 17.65 V T05
2023-11-03 11:04:50 C 02 32 15.029 +18 58 18.59 V T05
2023-11-03 11:12:08 C 02 32 14.262 +18 58 19.23 X F52
2023-11-03 11:18:56 C 02 32 13.526 +18 58 19.63 V T05
2023-11-03 11:30:55 C 02 32 12.231 +18 58 20.37 X F52
2023-11-03 11:49:40 C 02 32 10.204 +18 58 21.58 X F52
2023-11-03 12:08:38 C 02 32 08.158 +18 58 22.76 X F52
2023-11-04 08:12:20 C 02 30 00.378 +18 59 38.51 V G96
2023-11-04 08:19:45 C 02 29 59.568 +18 59 38.87 V G96
2023-11-04 08:27:11 C 02 29 58.762 +18 59 39.34 V G96
2023-11-04 08:34:36 C 02 29 57.955 +18 59 39.80 V G96
2023-11-04 14:59:41 C 02 29 17.258 +19 00 10.22 V P07
2023-11-04 15:53:19 C 02 29 11.318 +19 00 13.64 V P07
2023-11-04 16:46:09 C 02 29 05.568 +19 00 17.39 V P07
2023-11-04 17:28:03 C 02 29 00.936 +19 00 20.70 V P07
2023-11-05 07:11:56 C 02 27 32.746 +19 00 57.92 V 703
2023-11-05 07:19:41 C 02 27 31.925 +19 00 58.43 V 703
2023-11-05 07:27:26 C 02 27 31.050 +19 00 58.68 V 703
2023-11-05 07:35:11 C 02 27 30.197 +19 00 58.90 V 703
2023-11-05 10:27:51 C 02 27 11.645 +19 01 10.09 V T05
2023-11-05 10:32:24 C 02 27 11.138 +19 01 10.74 V T05
2023-11-05 10:40:31 C 02 27 10.270 +19 01 10.45 V T05
2023-11-05 10:55:08 C 02 27 08.630 +19 01 11.42 V T05
2023-11-05 23:45:19 C 02 25 45.64 +19 01 46.8 V 130
2023-11-05 23:47:20 C 02 25 45.42 +19 01 46.9 V 130
2023-11-05 23:49:21 C 02 25 45.20 +19 01 46.8 V 130
2023-11-05 23:51:21 C 02 25 44.99 +19 01 47.2 V 130
2023-11-06 21:06:45 B 02 23 27.17 +19 02 45.0 X K19
2023-11-06 21:12:04 B 02 23 26.59 +19 02 45.4 X K19
2023-11-06 21:17:28 B 02 23 25.99 +19 02 45.5 X K19
2023-11-07 06:53:20 C 02 22 23.185 +19 03 10.48 V 703
2023-11-07 07:00:55 C 02 22 22.328 +19 03 10.55 V 703
2023-11-07 07:08:30 C 02 22 21.497 +19 03 11.16 V 703
2023-11-07 07:16:05 C 02 22 20.647 +19 03 11.20 V 703
2023-11-08 11:51:44 C 02 19 13.254 +19 04 11.67 X F51
2023-11-08 11:52:46 C 02 19 13.138 +19 04 11.67 X F51
2023-11-08 12:09:27 C 02 19 11.279 +19 04 12.10 X F51
2023-11-08 12:10:29 C 02 19 11.167 +19 04 12.11 X F51
2023-11-08 12:27:15 C 02 19 09.303 +19 04 12.49 X F51