16657 (1993 UB)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4606673306 ± 1.22e-08
Semi-major axis (a)2.2767138296 AU ± 6.53e-10
Inclination (i)24.94466450° ± 2.41e-06
Long. of Asc. Node (Ω)31.18959077° ± 3.19e-06
Arg. of Perihelion (ω)21.29852548° ± 5.39e-06
Mean Anomaly (M)111.10642678° ± 1.84e-06
Mean Motion (n)0.2869125912°/day ± 1.23e-10
Perihelion dist (q)1.22790615 AU ± 2.77e-08
Aphelion dist (Q)3.32552151 AU ± 2.77e-08
Orbital Period3.43528417 yr ± 1.48e-09
Physical Parameters
H (abs. magnitude)16.55
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.251″
Uncertainty0
Orbit TypeAmor
MOID0.252107 AU
Observations Used912
Oppositions23
Arc Total1993-2025
First Observation Used1993-10-23
Last Observation Used2025-05-26
Observations (1002)
Date Type RA Dec Mag Band Observatory
2010-10-05 10:37:05 C 20 16 30.68 -52 11 15.4 r E12
2010-10-05 10:48:05 C 20 16 30.90 -52 11 06.1 r E12
2010-10-05 10:59:05 C 20 16 31.26 -52 10 54.5 r E12
2010-10-16 12:28:59 S 20 27 52.056 -47 50 48.55 L C51
2010-10-17 05:56:34 S 20 28 47.738 -47 33 01.40 L C51
2010-10-17 05:56:45 S 20 28 47.491 -47 33 02.16 L C51
2010-10-28 09:44:06 C 20 45 06.33 -42 48 47.6 r E12
2010-10-28 10:02:52 C 20 45 07.52 -42 48 26.2 r E12
2010-10-28 10:21:41 C 20 45 08.78 -42 48 04.3 r E12
2010-10-28 10:40:32 C 20 45 10.00 -42 47 44.0 r E12
2012-03-28 08:00:51 C 14 17 31.53 -10 39 52.4 o 691
2012-03-28 08:26:26 C 14 17 30.41 -10 39 51.1 o 691
2012-03-28 08:52:02 C 14 17 29.31 -10 39 50.9 o 691
2012-04-29 07:07:06 C 13 40 47.24 -10 09 11.8 r G96
2012-04-29 07:14:45 C 13 40 46.84 -10 09 11.6 r G96
2012-04-29 07:22:34 C 13 40 46.52 -10 09 11.3 r G96
2012-04-29 07:30:14 C 13 40 46.16 -10 09 11.8 r G96
2015-02-20 10:12:06 C 13 16 50.96 +19 00 33.8 q G96
2015-02-20 10:18:41 C 13 16 50.69 +19 00 34.9 q G96
2015-02-20 10:25:18 C 13 16 50.46 +19 00 36.3 q G96
2015-02-20 10:31:54 C 13 16 50.17 +19 00 37.7 q G96
2015-03-15 12:37:50 C 12 47 23.013 +20 22 09.13 L F51
2015-03-15 12:54:35 C 12 47 21.928 +20 22 10.04 L F51
2015-03-15 13:11:15 C 12 47 20.849 +20 22 11.04 L F51
2015-03-15 13:28:01 C 12 47 19.767 +20 22 12.01 L F51
2015-03-22 07:29:40 C 12 36 58.92 +20 26 01.1 q 703
2015-03-22 07:36:08 C 12 36 58.47 +20 26 02.2 q 703
2015-03-22 07:49:07 C 12 36 57.64 +20 26 00.7 q 703
2015-03-28 09:12:51 C 12 27 44.69 +20 18 49.7 q 703
2015-03-28 09:22:16 C 12 27 44.12 +20 18 47.8 q 703
2015-03-28 09:31:40 C 12 27 43.58 +20 18 47.7 q 703
2015-04-07 20:22:43 C 12 13 03.35 +19 42 46.0 q A13
2015-04-07 21:16:12 C 12 13 00.43 +19 42 35.2 q A13
2015-04-09 06:51:47 C 12 11 13.11 +19 35 42.4 q 703
2015-04-09 07:06:17 C 12 11 12.43 +19 35 38.7 q 703
2015-04-13 06:57:15 C 12 06 24.250 +19 13 21.01 L F51
2015-04-13 07:14:14 C 12 06 23.412 +19 13 16.89 L F51
2015-04-13 07:31:09 C 12 06 22.578 +19 13 12.62 L F51
2015-04-13 07:47:57 C 12 06 21.752 +19 13 08.42 L F51
2017-07-26 14:23:51 C 00 37 01.762 -44 00 36.56 L F51
2017-07-26 14:30:21 C 00 37 01.985 -44 00 39.32 L F51
2017-07-26 14:36:52 C 00 37 02.200 -44 00 41.92 L F51
2017-07-26 14:43:22 C 00 37 02.434 -44 00 44.78 L F51
2017-08-05 13:41:26 C 00 43 50.678 -45 45 56.98 L F51
2017-08-05 13:52:38 C 00 43 50.870 -45 46 02.33 L F51
2017-08-05 14:03:49 C 00 43 51.041 -45 46 07.19 L F51
2017-08-05 14:14:58 C 00 43 51.207 -45 46 12.36 L F51
2017-08-21 04:23:51 C 00 43 54.70 -48 36 01.9 o W92
2017-08-21 04:32:33 C 00 43 54.58 -48 36 05.3 o W92
2017-09-20 01:30:12 C 23 55 15.13 -49 52 12.5 q Y00