1998 WL4

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.7329156844 ± 1.16e-07
Semi-major axis (a)1.7665900590 AU ± 1.15e-08
Inclination (i)23.67780875° ± 2.87e-05
Long. of Asc. Node (Ω)225.83704820° ± 2.41e-05
Arg. of Perihelion (ω)41.91919791° ± 3.55e-05
Mean Anomaly (M)236.70261949° ± 8.03e-06
Mean Motion (n)0.4197672989°/day ± 4.11e-09
Perihelion dist (q)0.47182850 AU ± 2.04e-07
Aphelion dist (Q)3.06135162 AU ± 2.05e-07
Orbital Period2.34803017 yr ± 2.30e-08
Physical Parameters
H (abs. magnitude)19.49
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.486″
Uncertainty0
Orbit TypeApollo
MOID0.215706 AU
Observations Used80
Oppositions12
Arc Total1998-2019
First Observation Used1998-11-16
Last Observation Used2019-11-30
Observations (92)
Date Type RA Dec Mag Band Observatory
1998-11-16 04:01:01 c 02 26 10.91 +14 08 21.8 i 691
1998-11-16 04:31:48 c 02 26 08.62 +14 07 52.9 i 691
1998-11-16 05:33:43 c 02 26 03.94 +14 06 53.7 i 691
1998-11-17 06:56:14 c 02 24 15.68 +13 43 05.1 i 691
1998-11-17 07:04:14 c 02 24 15.18 +13 42 57.7 i 691
1998-11-17 07:12:47 c 02 24 14.53 +13 42 49.0 i 691
1998-11-19 04:48:48 c 02 21 13.12 +13 02 05.1 i 691
1998-11-19 05:19:36 c 02 21 11.17 +13 01 37.9 i 691
1998-11-19 05:50:27 c 02 21 09.16 +13 01 11.1 i 691
1998-11-22 05:47:17 c 02 16 54.16 +12 02 11.5 i 691
1998-11-22 05:53:05 c 02 16 53.86 +12 02 07.2 i 691
1998-11-22 05:58:52 c 02 16 53.52 +12 02 02.7 i 691
1998-11-26 06:24:46 c 02 12 08.56 +10 52 43.7 i 691
1998-11-26 06:30:35 c 02 12 08.27 +10 52 39.3 i 691
1998-11-26 06:36:02 c 02 12 08.00 +10 52 36.0 i 691
2005-11-25 06:31:50 C 01 40 09.55 +10 44 30.8 r G96
2005-11-25 06:41:50 C 01 40 09.26 +10 44 23.4 r G96
2005-11-25 06:51:57 C 01 40 09.08 +10 44 16.1 r G96
2005-11-25 07:02:05 C 01 40 08.79 +10 44 08.4 r G96
2010-02-12 05:26:11 S 12 33 47.983 -70 33 19.80 L C51
2010-02-12 07:01:21 S 12 34 32.138 -70 38 57.59 L C51
2010-02-12 07:01:32 S 12 34 32.119 -70 38 59.64 L C51
2010-02-12 08:36:42 S 12 35 16.253 -70 44 38.11 L C51
2010-02-12 13:22:34 S 12 37 32.414 -71 01 35.26 L C51
2010-02-12 16:33:06 S 12 39 05.338 -71 12 49.68 L C51
2012-10-25 06:17:55 C 01 07 14.30 +33 27 33.1 r 703
2012-10-25 06:26:45 C 01 07 13.65 +33 27 00.2 r 703
2012-10-25 06:35:32 C 01 07 13.04 +33 26 25.0 r 703
2012-10-25 06:44:18 C 01 07 12.43 +33 25 50.8 r 703
2012-10-25 07:23:44 C 01 07 09.15 +33 23 13.2 r H21
2012-10-25 07:33:07 C 01 07 08.51 +33 22 36.6 r H21
2012-10-25 07:41:26 C 01 07 07.94 +33 22 04.3 r H21
2012-10-25 07:42:09 C 01 07 08.31 +33 22 06.1 r 703
2012-10-25 07:43:33 C 01 07 08.15 +33 22 01.3 r 703
2012-10-25 07:44:58 C 01 07 08.34 +33 21 54.1 r 703
2012-10-25 07:46:26 C 01 07 07.97 +33 21 50.8 r 703
2012-10-25 20:15:41 C 01 06 22.35 +32 34 06.8 o 198
2012-10-25 20:23:58 C 01 06 21.86 +32 33 35.3 o 198
2012-10-25 20:29:28 C 01 06 21.53 +32 33 15.3 o 198
2012-10-25 20:30:51 C 01 06 21.39 +32 33 10.0 o 198
2012-10-26 01:41:59 C 01 06 01.39 +32 13 54.3 u 954
2012-10-26 02:33:46 C 01 05 58.02 +32 10 41.1 u 954
2012-10-26 02:54:04 C 01 05 57.11 +32 09 21.9 u 954
2012-10-27 03:27:38 C 01 04 36.64 +30 40 38.3 u H36
2012-10-27 03:57:02 C 01 04 35.04 +30 38 53.2 u H36
2012-10-27 04:11:46 C 01 04 34.27 +30 38 04.2 u H36
2012-11-05 01:41:17 C 00 57 45.83 +20 40 23.8 q H45
2012-11-05 01:43:26 C 00 57 45.77 +20 40 19.4 q H45
2012-11-05 01:45:00 C 00 57 45.74 +20 40 15.7 q H45
2012-11-05 01:46:25 C 00 57 45.71 +20 40 12.5 q H45