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
2004-11-16 20:57:18 C 02 23 14.82 +27 29 00.7 r A16
2004-11-16 21:02:57 C 02 23 14.06 +27 29 01.1 r A16
2004-11-16 21:08:35 C 02 23 13.29 +27 29 01.7 r A16
2004-11-16 21:27:47 C 02 23 10.71 +27 29 03.5 r A30
2004-11-16 21:30:42 C 02 23 10.30 +27 29 03.5 r A30
2004-11-18 21:12:04 C 02 16 49.99 +27 33 05.0 o 084
2004-11-20 02:09:21 C 02 12 59.62 +27 34 46.1 o 084
2004-11-21 18:13:43 C 02 07 44.05 +27 36 20.5 17.8 r 130
2004-11-21 18:17:28 C 02 07 43.55 +27 36 20.5 18.0 r 130
2004-11-21 18:22:15 C 02 07 42.91 +27 36 20.5 17.8 r 130
2004-11-21 18:26:02 C 02 07 42.39 +27 36 20.3 17.7 r 130
2004-11-21 19:20:44 C 02 07 35.14 +27 36 22.8 r A30
2004-11-21 19:26:12 C 02 07 34.41 +27 36 22.9 r A30
2004-11-21 19:26:57 C 02 07 34.33 +27 36 22.9 r A30
2004-11-21 19:30:48 C 02 07 33.84 +27 36 23.1 r A30
2004-11-21 21:14:09 C 02 07 19.92 +27 36 23.7 o 084
2004-11-25 22:12:41 C 01 54 52.30 +27 35 55.4 o 084
2004-11-28 02:36:57 C 01 48 23.39 +27 33 35.2 o 084
2004-11-28 05:13:32 C 01 48 04.52 +27 33 33.7 r H41
2004-11-28 05:15:31 C 01 48 04.25 +27 33 33.9 r H41
2004-11-28 05:17:26 C 01 48 04.04 +27 33 33.3 r H41
2004-11-28 05:20:49 C 01 48 03.62 +27 33 32.9 r H41
2004-11-28 05:22:41 C 01 48 03.36 +27 33 34.0 r H41
2004-12-01 03:43:55 C 01 39 44.93 +27 28 35.1 17.4 c 644
2004-12-01 04:11:48 C 01 39 41.64 +27 28 32.8 17.5 c 644
2004-12-01 04:40:02 C 01 39 38.32 +27 28 30.5 17.6 c 644
2004-12-02 05:07:12 C 01 36 51.55 +27 26 21.2 18.4 c 704
2004-12-02 05:30:10 C 01 36 48.94 +27 26 19.2 18.6 c 704
2004-12-02 05:48:37 C 01 36 46.84 +27 26 17.9 18.1 c 704
2004-12-02 06:09:10 C 01 36 44.52 +27 26 14.6 18.3 c 704
2004-12-11 05:13:24 C 01 15 19.25 +27 02 55.3 d 703
2004-12-11 05:28:07 C 01 15 17.91 +27 02 53.8 d 703
2004-12-11 05:42:45 C 01 15 16.64 +27 02 52.0 d 703
2004-12-11 05:57:29 C 01 15 15.31 +27 02 50.0 d 703
2004-12-13 16:48:13 C 01 10 25.42 +26 56 16.9 o 084
2004-12-16 04:56:23 C 01 05 56.29 +26 50 15.2 d 703
2004-12-16 05:09:14 C 01 05 55.37 +26 50 13.7 d 703
2004-12-16 05:21:50 C 01 05 54.46 +26 50 12.9 d 703
2004-12-16 05:34:28 C 01 05 53.51 +26 50 11.3 d 703
2005-02-03 17:36:14 C 00 54 07.30 +29 36 00.8 o 084
2005-02-05 18:56:19 C 00 55 48.79 +29 55 20.8 o 084
2005-02-15 18:34:48 C 01 05 30.48 +31 39 28.0 o 084
2005-03-04 19:01:33 C 01 25 38.10 +34 52 46.4 o 084
2005-03-09 18:04:22 C 01 31 33.86 +35 41 37.1 o 084
2005-03-09 18:10:02 C 01 31 34.13 +35 41 38.8 o 084
2005-03-14 17:33:25 C 01 36 57.79 +36 18 14.3 o 084
2005-03-14 17:39:07 C 01 36 58.02 +36 18 15.8 o 084
2005-03-16 18:03:10 C 01 38 52.23 +36 27 26.5 o 084
2005-03-22 18:17:30 C 01 42 55.48 +36 23 29.0 o 084
2005-08-10 18:09:19 C 01 40 26.61 -41 49 31.4 r E12