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
2019-08-27 10:42:48 C 01 40 11.74 -24 02 44.8 V 703
2019-10-15 08:36:55 C 00 03 31.514 -27 08 29.73 U F51
2019-10-15 08:51:38 C 00 03 30.437 -27 08 25.57 U F51
2019-10-15 09:21:04 C 00 03 28.274 -27 08 17.24 U F51
2019-10-18 09:03:16 C 23 58 32.696 -26 46 14.21 U F52
2019-10-18 09:17:13 C 23 58 31.727 -26 46 09.55 U F52
2019-10-18 09:31:11 C 23 58 30.801 -26 46 05.11 U F52
2019-10-18 09:45:09 C 23 58 29.843 -26 46 00.34 U F52
2019-10-28 06:19:10 C 23 45 10.791 -25 14 10.77 U F51
2019-10-28 06:34:14 C 23 45 10.062 -25 14 04.19 U F51
2019-10-28 06:35:09 C 23 45 10.018 -25 14 03.78 U F51
2019-10-28 06:49:16 C 23 45 09.341 -25 13 57.72 U F51
2019-10-28 06:50:11 C 23 45 09.296 -25 13 57.21 U F51
2019-10-28 07:04:18 C 23 45 08.607 -25 13 51.12 U F51
2019-10-28 07:05:13 C 23 45 08.565 -25 13 50.65 U F51
2019-11-02 04:17:08 C 23 40 15.18 -24 20 05.5 V G96
2019-11-02 04:25:07 C 23 40 14.88 -24 20 01.4 V G96
2019-11-02 04:33:04 C 23 40 14.57 -24 19 57.9 V G96
2019-11-02 04:41:03 C 23 40 14.25 -24 19 54.0 V G96
2020-01-23 05:25:55 C 00 08 38.567 -06 27 00.20 U F51
2020-01-23 05:32:48 C 00 08 38.880 -06 26 56.13 U F51
2020-01-23 05:39:40 C 00 08 39.170 -06 26 52.70 U F51
2020-01-23 05:46:30 C 00 08 39.472 -06 26 48.79 U F51
2020-08-08 11:35:38 C 06 20 23.01 +32 37 13.7 U I41
2020-08-08 11:43:37 C 06 20 24.21 +32 37 16.2 U I41
2020-08-08 11:51:01 C 06 20 25.31 +32 37 18.2 U I41
2020-08-08 11:58:26 C 06 20 26.40 +32 37 20.0 U I41
2020-08-12 11:40:16 C 06 35 04.99 +33 00 30.2 U I41
2020-08-12 11:47:22 C 06 35 06.11 +33 00 31.7 U I41
2020-08-12 11:54:28 C 06 35 07.22 +33 00 33.2 U I41
2020-08-14 11:41:58 C 06 42 41.76 +33 10 24.7 U I41
2020-08-14 11:48:59 C 06 42 42.88 +33 10 26.1 U I41
2020-08-14 11:56:00 C 06 42 44.00 +33 10 27.8 U I41
2020-08-14 12:03:02 C 06 42 45.13 +33 10 29.2 U I41
2020-08-20 11:49:06 C 07 06 38.83 +33 31 58.1 U I41
2020-08-20 11:56:13 C 07 06 40.07 +33 31 58.7 U I41
2020-08-20 12:03:21 C 07 06 41.29 +33 31 59.5 U I41
2020-08-20 12:10:28 C 07 06 42.50 +33 32 00.4 U I41
2020-08-22 11:51:40 C 07 15 00.75 +33 36 01.1 U I41
2020-08-22 11:58:43 C 07 15 01.99 +33 36 01.5 U I41
2020-08-22 12:05:45 C 07 15 03.21 +33 36 02.0 U I41
2020-08-22 12:12:48 C 07 15 04.44 +33 36 02.6 U I41
2020-09-25 12:16:43 C 10 04 53.32 +27 52 34.7 U I41
2020-09-25 12:23:29 C 10 04 54.89 +27 52 27.4 U I41
2020-09-25 12:30:16 C 10 04 56.45 +27 52 20.2 U I41
2020-09-25 12:37:03 C 10 04 58.02 +27 52 12.9 U I41
2020-09-25 12:43:50 C 10 04 59.59 +27 52 05.7 U I41
2020-10-03 12:19:16 C 10 49 36.80 +23 49 03.0 U I41
2020-10-03 12:32:53 C 10 49 39.97 +23 48 43.3 U I41
2020-10-03 12:39:41 C 10 49 41.55 +23 48 33.4 U I41