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
2002-11-11 03:48:42 C 00 59 56.94 -01 30 10.0 19.0 c 704
2002-11-11 04:14:10 C 00 59 55.25 -01 30 08.5 19.4 c 704
2002-11-11 04:39:49 C 00 59 53.59 -01 30 05.7 19.7 c 704
2002-11-11 05:05:22 C 00 59 51.95 -01 30 04.2 19.6 c 704
2004-09-02 12:36:02 C 03 55 36.99 +17 49 54.3 o 568
2004-09-02 12:40:58 C 03 55 37.09 +17 49 55.8 o 568
2004-09-17 09:19:41 C 04 00 12.87 +19 38 27.2 20.0 c 704
2004-09-17 09:36:44 C 04 00 12.80 +19 38 30.5 20.3 c 704
2004-09-17 10:10:52 C 04 00 13.00 +19 38 42.5 20.4 c 704
2004-09-17 10:27:55 C 04 00 12.97 +19 38 48.1 20.1 c 704
2004-09-22 09:21:46 C 04 00 04.90 +20 17 27.5 o 699
2004-09-22 09:47:36 C 04 00 04.75 +20 17 36.4 o 699
2004-09-22 10:13:27 C 04 00 04.52 +20 17 46.3 o 699
2004-09-22 10:39:18 C 04 00 04.34 +20 17 53.8 o 699
2004-10-09 07:19:23 C 03 51 00.16 +22 41 57.2 18.9 c 704
2004-10-09 07:35:02 C 03 50 59.54 +22 42 03.7 19.5 c 704
2004-10-09 07:50:39 C 03 50 58.79 +22 42 09.0 19.1 c 704
2004-10-09 08:06:32 C 03 50 58.10 +22 42 14.2 19.1 c 704
2004-10-09 08:22:10 C 03 50 57.42 +22 42 21.3 19.5 c 704
2004-10-09 10:55:43 C 03 50 50.63 +22 43 18.6 o 699
2004-10-09 11:09:47 C 03 50 50.09 +22 43 23.7 o 699
2004-10-09 11:23:51 C 03 50 49.42 +22 43 29.2 o 699
2004-10-09 11:37:58 C 03 50 48.80 +22 43 34.9 o 699
2004-10-10 10:22:35 C 03 49 49.27 +22 52 12.1 c 691
2004-10-10 11:02:15 C 03 49 47.41 +22 52 27.0 c 691
2004-10-10 11:42:01 C 03 49 45.54 +22 52 42.1 c 691
2004-10-21 06:33:51 C 03 34 08.02 +24 32 12.5 18.8 c 704
2004-10-21 06:50:53 C 03 34 06.69 +24 32 19.3 19.1 c 704
2004-10-21 07:07:48 C 03 34 05.36 +24 32 25.7 19.1 c 704
2004-10-21 07:24:42 C 03 34 04.01 +24 32 32.0 19.0 c 704
2004-10-21 07:41:41 C 03 34 02.70 +24 32 38.7 18.9 c 704
2004-10-23 02:44:06 C 03 30 38.14 +24 48 56.6 r 170
2004-10-23 02:46:19 C 03 30 37.94 +24 48 57.7 r 170
2004-10-23 02:48:32 C 03 30 37.72 +24 48 58.5 r 170
2004-10-23 02:50:45 C 03 30 37.57 +24 48 59.3 r 170
2004-10-23 02:52:58 C 03 30 37.39 +24 49 00.0 r 170
2004-10-23 08:50:32 C 03 30 08.24 +24 51 15.8 c 670
2004-10-23 11:27:10 C 03 29 54.94 +24 52 14.2 c 670
2004-11-01 23:01:38 C 03 07 52.49 +26 11 49.3 o 084
2004-11-02 09:23:40 C 03 06 43.52 +26 15 06.5 o 699
2004-11-02 09:48:33 C 03 06 40.62 +26 15 14.7 o 699
2004-11-02 10:13:27 C 03 06 37.82 +26 15 22.3 o 699
2004-11-02 10:38:22 C 03 06 34.99 +26 15 29.7 o 699
2004-11-02 18:40:00 C 03 05 41.75 +26 17 53.8 o 084
2004-11-04 11:13:06 C 03 01 02.69 +26 29 56.0 d 703
2004-11-04 11:27:51 C 03 01 00.89 +26 30 00.8 d 703
2004-11-04 11:42:38 C 03 00 59.17 +26 30 05.0 d 703
2004-11-04 11:57:22 C 03 00 57.40 +26 30 08.8 d 703
2004-11-09 21:12:47 C 02 45 11.16 +27 02 31.6 r A16
2004-11-09 21:25:17 C 02 45 09.28 +27 02 35.8 r A16