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
2012-11-05 01:49:20 C 00 57 45.67 +20 40 06.6 q H45
2012-11-05 01:50:49 C 00 57 45.65 +20 40 02.8 q H45
2012-11-06 09:00:29 C 00 57 17.60 +19 34 24.4 r 703
2012-11-06 09:08:21 C 00 57 17.56 +19 34 09.1 r 703
2012-11-06 09:16:16 C 00 57 17.46 +19 33 52.3 r 703
2012-11-06 09:24:08 C 00 57 17.42 +19 33 35.0 r 703
2012-11-07 20:05:26 C 00 56 56.22 +18 25 47.1 t 204
2012-11-07 20:23:47 C 00 56 55.97 +18 25 12.3 t 204
2012-11-07 20:42:08 C 00 56 55.74 +18 24 38.0 t 204
2017-01-27 13:15:31 C 09 47 52.35 -44 18 52.9 t 474
2017-01-27 13:20:35 C 09 47 52.05 -44 19 02.1 t 474
2017-01-27 13:25:39 C 09 47 51.60 -44 19 11.7 t 474
2019-10-11 18:56:09 C 17 28 18.20 +44 14 12.1 V C95
2019-10-11 19:21:22 C 17 28 39.64 +44 14 42.4 V C95
2019-10-11 19:46:35 C 17 29 01.09 +44 15 13.1 V C95
2019-10-13 20:50:23 C 18 12 45.90 +44 47 37.2 V 204
2019-10-13 21:00:47 C 18 12 55.44 +44 47 36.7 V 204
2019-10-13 21:09:31 C 18 13 03.42 +44 47 36.1 V 204
2019-10-18 10:30:45 S 19 51 26.827 +42 06 49.39 L C51
2019-10-18 12:05:00 S 19 52 45.250 +42 02 23.96 L C51
2019-10-18 13:39:04 S 19 54 03.050 +41 57 56.70 L C51
2019-10-22 19:59:17 C 21 07 01.59 +35 55 34.8 q 160
2019-10-22 20:02:20 C 21 07 03.40 +35 55 23.1 q 160
2019-10-22 20:05:25 C 21 07 05.13 +35 55 09.8 q 160
2019-10-25 19:04:03 C 21 44 21.28 +31 17 14.9 V 130
2019-10-25 19:06:48 C 21 44 22.51 +31 17 04.3 V 130
2019-10-25 19:09:32 C 21 44 23.76 +31 16 53.8 V 130
2019-10-25 19:12:17 C 21 44 25.02 +31 16 43.4 V 130
2019-10-28 03:06:04 C 22 07 33.22 +27 50 48.7 V 703
2019-10-28 03:14:09 C 22 07 36.16 +27 50 20.6 V 703
2019-10-28 03:22:14 C 22 07 39.20 +27 49 51.4 V 703
2019-10-28 03:30:18 C 22 07 42.11 +27 49 23.7 V 703
2019-10-29 09:58:05 C 22 18 26.33 +26 05 16.9 V T08
2019-10-29 10:02:31 C 22 18 27.90 +26 05 00.7 V T08
2019-10-29 10:12:20 C 22 18 31.05 +26 04 27.2 V T08
2019-10-29 10:28:30 C 22 18 36.37 +26 03 33.4 V T08
2019-10-31 03:02:57 C 22 31 18.20 +23 54 53.1 V 703
2019-10-31 03:19:16 C 22 31 22.93 +23 54 05.2 V 703
2019-10-31 03:27:27 C 22 31 25.19 +23 53 40.2 V 703
2019-11-30 06:38:45 C 00 12 56.930 +07 18 59.52 U F52
2019-11-30 06:56:07 C 00 12 58.232 +07 18 51.49 U F52
2019-11-30 07:13:23 C 00 12 59.570 +07 18 43.38 U F52