2021 WD4

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.2270533471 ± 3.44e-05
Semi-major axis (a)1.4180182541 AU ± 8.33e-05
Inclination (i)19.58310757° ± 1.99e-03
Long. of Asc. Node (Ω)70.22865869° ± 7.16e-04
Arg. of Perihelion (ω)34.50457078° ± 2.14e-03
Mean Anomaly (M)99.83255028° ± 7.11e-02
Mean Motion (n)0.5836997991°/day ± 5.14e-05
Perihelion dist (q)1.09605246 AU ± 8.08e-05
Aphelion dist (Q)1.73998404 AU ± 1.13e-04
Orbital Period1.68858424 yr ± 1.49e-04
Physical Parameters
H (abs. magnitude)23.06
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-02
RMS Residual0.237″
Uncertainty2
Orbit TypeAmor
MOID0.140234 AU
Observations Used33
Oppositions1
Arc Total2021-2021
First Observation Used2021-11-28
Last Observation Used2021-12-23
Observations (35)
Date Type RA Dec Mag Band Observatory
2021-11-28 08:50:17 C 02 23 40.008 -06 14 39.52 U F51
2021-11-28 09:06:25 C 02 23 37.706 -06 13 45.48 U F51
2021-11-28 09:22:32 C 02 23 35.431 -06 12 51.38 U F51
2021-11-29 01:25:10 C 02 21 31.49 -05 18 14.8 V 807
2021-11-29 01:31:40 C 02 21 30.60 -05 17 53.4 V 807
2021-11-29 01:37:51 C 02 21 29.70 -05 17 31.9 V 807
2021-11-30 01:02:15 C 02 18 28.55 -03 57 08.6 V 807
2021-11-30 01:07:36 C 02 18 27.82 -03 56 50.1 V 807
2021-11-30 01:12:55 C 02 18 27.09 -03 56 31.6 V 807
2021-11-30 02:31:30 C 02 18 16.84 -03 52 46.0 u H21
2021-11-30 02:36:37 C 02 18 16.12 -03 52 27.7 u H21
2021-11-30 02:47:09 C 02 18 14.67 -03 51 51.4 u H21
2021-11-30 05:56:56 C 02 17 49.63 -03 40 47.7 V 654
2021-11-30 06:21:42 C 02 17 46.075 -03 39 19.31 V 679
2021-11-30 06:26:57 C 02 17 45.386 -03 39 00.83 V 679
2021-11-30 06:30:28 C 02 17 45.00 -03 38 50.6 V 654
2021-11-30 07:08:42 C 02 17 39.73 -03 36 37.3 V 654
2021-11-30 07:36:17 C 02 17 35.64 -03 34 58.5 o 691
2021-11-30 07:48:17 C 02 17 34.03 -03 34 16.7 o 691
2021-11-30 08:00:16 C 02 17 32.41 -03 33 35.0 o 691
2021-12-02 02:54:24 C 02 12 09.35 -01 01 07.5 V I52
2021-12-02 02:59:14 C 02 12 08.66 -01 00 49.5 V I52
2021-12-03 05:51:48 C 02 08 47.19 +00 37 01.5 V G96
2021-12-03 05:59:42 C 02 08 46.17 +00 37 30.1 V G96
2021-12-03 06:07:38 C 02 08 45.08 +00 37 59.5 V G96
2021-12-03 06:15:34 C 02 08 44.01 +00 38 28.2 V G96
2021-12-08 01:58:39 C 01 55 17.72 +07 52 07.0 V I52
2021-12-08 02:04:10 C 01 55 17.07 +07 52 27.7 V I52
2021-12-08 02:09:41 C 01 55 16.40 +07 52 49.2 V I52
2021-12-08 04:40:53 C 01 54 58.29 +08 02 22.7 V V06
2021-12-08 04:43:01 C 01 54 58.04 +08 02 30.3 V V06
2021-12-08 04:45:09 C 01 54 57.76 +08 02 38.4 V V06
2021-12-22 23:59:06 C 01 25 19.84 +29 00 09.8 u H21
2021-12-23 00:07:06 C 01 25 19.32 +29 00 35.1 u H21
2021-12-23 00:11:20 C 01 25 19.05 +29 00 48.3 u H21