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
1998-03-29 18:50:36 C 02 51 20.44 +34 47 46.9 557
1998-03-29 18:59:02 C 02 51 21.39 +34 47 52.0 557
1998-04-20 19:34:14 C 04 02 42.17 +37 49 25.2 118
1998-04-20 19:51:55 C 04 02 44.67 +37 49 23.8 118
1998-07-01 19:48:05 C 03 41 18.79 -41 55 17.6 426
1998-07-01 19:52:50 C 03 41 18.49 -41 55 25.3 426
1998-07-01 19:57:38 C 03 41 18.24 -41 55 33.3 426
1998-07-01 20:02:23 C 03 41 17.98 -41 55 40.5 426
1998-07-01 20:07:08 C 03 41 17.70 -41 55 48.5 426
1998-08-10 14:53:44 C 01 52 57.36 -62 15 50.9 422
1998-08-10 14:55:11 C 01 52 57.07 -62 15 52.6 422
1998-08-10 14:58:03 C 01 52 56.43 -62 15 54.5 422
1998-08-15 19:38:20 C 01 23 01.50 -63 36 22.8 426
1998-08-15 19:42:57 C 01 23 00.23 -63 36 24.5 426
1998-08-15 19:47:34 C 01 22 59.00 -63 36 27.2 426
1998-08-15 19:52:09 C 01 22 57.86 -63 36 29.1 426
1998-09-19 14:22:12 C 22 29 02.47 -56 33 28.3 422
1998-09-19 14:23:03 C 22 29 02.24 -56 33 28.1 422
1999-09-06 01:48:43 C 05 26 24.85 +29 21 20.2 d 046
1999-09-06 01:51:16 C 05 26 24.96 +29 21 21.2 d 046
1999-09-06 01:55:11 C 05 26 25.28 +29 21 24.8 d 046
1999-09-15 02:54:15 C 05 45 08.64 +31 16 14.6 d 046
1999-09-15 02:56:55 C 05 45 08.91 +31 16 16.1 d 046
1999-10-20 18:38:59 C 07 21 39.01 +41 47 56.8 360
1999-10-20 18:44:45 C 07 21 39.86 +41 48 02.0 360
1999-10-20 18:50:15 C 07 21 40.72 +41 48 07.8 360
1999-10-31 09:51:09 C 08 07 57.11 +46 15 44.8 18.4 a 704
1999-10-31 10:14:42 C 08 08 02.23 +46 16 11.5 18.5 a 704
1999-10-31 10:38:40 C 08 08 07.32 +46 16 38.3 18.6 a 704
1999-10-31 11:02:37 C 08 08 12.29 +46 17 05.5 18.8 a 704
1999-10-31 11:26:21 C 08 08 17.30 +46 17 31.9 18.2 a 704
1999-11-01 09:46:10 C 08 13 10.36 +46 42 17.6 18.0 a 704
1999-11-01 10:09:52 C 08 13 15.49 +46 42 44.3 18.0 a 704
1999-11-01 10:33:40 C 08 13 20.63 +46 43 11.6 17.9 a 704
1999-11-01 10:57:29 C 08 13 25.90 +46 43 38.2 18.0 a 704
1999-11-01 11:21:07 C 08 13 30.98 +46 44 05.2 17.8 a 704
1999-11-02 02:47:50 C 08 16 59.62 +47 01 13.7 c 118
1999-11-02 02:54:57 C 08 17 01.24 +47 01 21.8 c 118
1999-11-10 18:53:45 C 09 13 02.56 +50 46 44.2 360
1999-11-10 18:57:15 C 09 13 03.75 +50 46 47.8 360
1999-11-10 19:00:14 C 09 13 04.64 +50 46 50.7 360
2000-07-24 17:27:13 C 02 03 14.357 -14 06 33.36 413
2000-07-24 17:32:47 C 02 03 14.402 -14 06 34.66 413
2000-07-24 17:37:56 C 02 03 14.452 -14 06 35.57 413
2000-09-03 15:40:05 C 01 42 12.302 -19 36 37.53 413
2000-09-03 15:42:44 C 01 42 12.138 -19 36 38.48 413
2000-09-29 06:31:33 C 00 54 45.67 -22 38 17.0 c 699
2000-09-29 06:37:30 C 00 54 45.03 -22 38 18.7 z 711
2000-09-29 06:44:59 C 00 54 44.40 -22 38 18.4 c 699
2000-09-29 06:48:39 C 00 54 44.00 -22 38 20.2 z 711