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
1997-10-29 05:56:23 C 02 35 59.59 +16 57 58.6 18.6 a 704
1997-10-29 06:55:05 C 02 35 53.66 +16 58 03.9 a 704
1997-10-29 07:24:21 C 02 35 50.68 +16 58 04.2 19.1 a 704
1997-10-29 07:53:55 C 02 35 47.62 +16 58 08.6 a 704
1997-10-29 22:17:15 C 02 34 22.10 +16 58 52.7 046
1997-10-29 22:20:39 C 02 34 21.76 +16 58 53.0 046
1997-10-29 22:23:37 C 02 34 21.46 +16 58 53.3 046
1997-10-30 07:03:58 C 02 33 29.38 +16 59 20.0 19.7 a 704
1997-10-30 07:09:24 C 02 33 28.91 +16 59 20.9 19.5 a 704
1997-10-30 07:33:47 C 02 33 26.26 +16 59 22.5 19.6 a 704
1997-10-30 07:39:14 C 02 33 26.07 +16 59 21.5 a 704
1997-10-30 08:03:55 C 02 33 23.14 +16 59 23.0 a 704
1997-10-30 08:09:22 C 02 33 22.94 +16 59 22.3 a 704
1997-10-30 08:33:36 C 02 33 20.22 +16 59 23.5 19.7 a 704
1997-10-30 08:39:02 C 02 33 19.85 +16 59 24.2 19.3 a 704
1997-10-30 09:03:22 C 02 33 17.05 +16 59 27.0 19.6 a 704
1997-10-30 09:08:49 C 02 33 16.54 +16 59 24.7 19.4 a 704
1997-10-30 11:47:43 C 02 33 01.06 +16 59 44.1 z 422
1997-10-30 11:51:44 C 02 33 00.71 +16 59 44.3 z 422
1997-10-30 11:55:45 C 02 33 00.29 +16 59 44.1 z 422
1997-10-30 21:10:03 C 02 32 04.44 +17 00 00.4 557
1997-10-30 21:13:57 C 02 32 04.03 +17 00 00.6 557
1997-10-30 21:17:40 C 02 32 03.60 +17 00 00.7 557
1997-10-31 03:22:45 C 02 31 26.73 +17 00 19.5 17.5 a 784
1997-10-31 04:19:30 C 02 31 20.89 +17 00 22.0 18.2 a 784
1997-10-31 04:25:14 C 02 31 20.31 +17 00 21.6 17.9 a 784
1997-10-31 05:26:59 C 02 31 13.96 +17 00 24.1 17.9 a 784
1997-10-31 05:34:15 C 02 31 13.19 +17 00 24.4 a 784
1997-10-31 20:40:14 C 02 29 41.36 +17 01 02.5 046
1997-10-31 20:45:18 C 02 29 40.91 +17 01 02.6 046
1997-10-31 20:50:23 C 02 29 40.29 +17 01 02.6 046
1997-11-01 11:41:15 C 02 28 09.29 +17 01 48.4 z 422
1997-11-01 11:43:25 C 02 28 09.07 +17 01 48.1 z 422
1997-11-01 11:49:47 C 02 28 08.49 +17 01 39.7 z 897
1997-11-01 11:59:47 C 02 28 07.32 +17 01 40.6 z 897
1997-11-01 12:45:46 C 02 28 02.57 +17 01 42.7 z 897
1997-11-01 14:02:00 C 02 27 54.68 +17 01 53.0 426
1997-11-01 14:08:30 C 02 27 54.03 +17 01 54.0 426
1997-11-01 14:14:23 C 02 27 53.40 +17 01 53.8 426
1997-11-01 15:50:30 C 02 27 43.35 +17 01 49.1 360
1997-11-01 15:55:15 C 02 27 42.86 +17 01 49.3 360
1997-11-01 16:08:30 C 02 27 41.47 +17 01 49.9 360
1997-11-01 20:33:10 C 02 27 14.63 +17 01 56.9 z 106
1997-11-01 20:51:59 C 02 27 12.67 +17 01 57.8 z 106
1997-11-02 23:07:05 C 02 24 29.62 +17 02 47.9 046
1997-11-02 23:09:57 C 02 24 29.31 +17 02 47.9 046
1997-11-02 23:13:01 C 02 24 28.99 +17 02 48.0 046
1997-11-02 23:58:14 C 02 24 24.26 +17 02 49.2 z 587
1997-11-03 00:47:30 C 02 24 19.05 +17 02 50.6 z 587
1997-11-03 06:49:50 C 02 23 41.51 +17 03 02.5 z 700