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
1997-11-21 22:00:10 C 01 37 54.76 +16 56 20.7 046
1997-11-21 22:03:56 C 01 37 54.42 +16 56 20.4 046
1997-11-21 22:10:50 C 01 37 53.75 +16 56 19.9 046
1997-11-24 13:42:15 C 01 32 07.30 +16 53 57.7 360
1997-11-24 13:48:30 C 01 32 06.75 +16 53 56.9 360
1997-11-24 13:55:30 C 01 32 06.11 +16 53 57.6 360
1997-12-02 04:45:59 C 01 17 24.46 +16 48 46.5 658
1997-12-02 04:51:34 C 01 17 24.02 +16 48 46.9 658
1997-12-02 04:56:03 C 01 17 23.64 +16 48 47.6 658
1997-12-06 21:16:41 C 01 09 57.31 +16 48 23.0 z 587
1997-12-06 21:22:40 C 01 09 57.02 +16 48 23.8 z 587
1997-12-06 21:29:20 C 01 09 56.55 +16 48 23.5 z 587
1997-12-19 17:00:35 C 00 56 04.65 +17 04 47.7 046
1997-12-19 17:05:34 C 00 56 04.44 +17 04 47.9 046
1997-12-19 17:12:14 C 00 56 04.29 +17 04 48.3 046
1997-12-24 10:42:15 C 00 53 14.83 +17 18 33.5 360
1997-12-24 10:50:14 C 00 53 14.67 +17 18 34.7 360
1997-12-24 10:57:14 C 00 53 14.48 +17 18 35.7 360
1997-12-27 19:09:33 C 00 51 56.51 +17 30 57.7 z 104
1997-12-27 19:16:50 C 00 51 56.40 +17 30 58.6 z 104
1997-12-27 19:23:59 C 00 51 56.34 +17 31 00.1 z 104
1997-12-30 03:21:23 C 00 51 21.30 +17 40 59.6 z 711
1997-12-30 03:40:38 C 00 51 21.12 +17 41 03.2 z 711
1997-12-31 02:44:03 C 00 51 11.35 +17 45 29.5 z 711
1997-12-31 03:03:04 C 00 51 11.19 +17 45 32.9 z 711
1998-01-08 03:13:26 C 00 51 25.03 +18 29 42.0 658
1998-01-08 03:22:01 C 00 51 25.07 +18 29 43.9 658
1998-01-10 04:04:08 C 00 51 53.91 +18 42 55.8 658
1998-01-10 04:10:36 C 00 51 53.97 +18 42 57.4 658
1998-01-10 04:18:02 C 00 51 54.05 +18 42 59.7 658
1998-01-17 17:14:40 C 00 55 02.88 +19 38 50.5 046
1998-01-17 17:20:17 C 00 55 03.02 +19 38 52.9 046
1998-01-17 17:32:45 C 00 55 03.35 +19 38 56.1 046
1998-01-30 10:27:29 C 01 04 42.95 +21 35 50.9 360
1998-01-30 10:34:00 C 01 04 43.20 +21 35 53.5 360
1998-01-30 10:40:29 C 01 04 43.47 +21 35 56.8 360
1998-02-08 17:34:24 C 01 14 53.26 +23 18 07.9 046
1998-02-08 17:40:12 C 01 14 53.56 +23 18 09.8 046
1998-02-08 17:44:05 C 01 14 53.70 +23 18 11.0 046
1998-02-08 17:49:28 C 01 14 53.96 +23 18 14.8 046
1998-02-18 17:47:54 C 01 28 32.56 +25 22 13.6 046
1998-02-18 17:50:35 C 01 28 32.68 +25 22 14.1 046
1998-02-18 17:55:56 C 01 28 32.99 +25 22 17.4 046
1998-02-20 18:45:25 C 01 31 39.94 +25 49 06.2 557
1998-02-20 18:49:28 C 01 31 40.18 +25 49 08.2 557
1998-02-20 18:55:10 C 01 31 40.68 +25 49 12.0 557
1998-02-20 18:58:01 C 01 31 40.79 +25 49 13.4 557
1998-03-19 03:38:23 C 02 23 28.16 +32 11 49.0 658
1998-03-19 03:42:51 C 02 23 28.61 +32 11 51.5 658
1998-03-19 03:49:43 C 02 23 29.33 +32 11 55.8 658