4544 Xanthus (1989 FB)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.2501386666 ± 9.43e-09
Semi-major axis (a)1.0420242968 AU ± 2.10e-10
Inclination (i)14.14293362° ± 1.06e-06
Long. of Asc. Node (Ω)23.93544276° ± 2.72e-06
Arg. of Perihelion (ω)333.83833488° ± 3.84e-06
Mean Anomaly (M)5.13929800° ± 3.64e-06
Mean Motion (n)0.9266068532°/day ± 2.81e-10
Perihelion dist (q)0.78137373 AU ± 9.82e-09
Aphelion dist (Q)1.30267486 AU ± 9.83e-09
Orbital Period1.06369414 yr ± 3.22e-10
Physical Parameters
H (abs. magnitude)17.39
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.282″
Uncertainty0
Orbit TypeApollo
MOID0.174208 AU
Observations Used2767
Radar Obs Used1
Oppositions1
Arc Total1989-2026
First Observation Used1989-03-30
Last Observation Used2026-02-18
Observations (3156)
Date Type RA Dec Mag Band Observatory
2026-01-18 02:40:33 C 23 50 58.117 +21 11 12.55 V 703
2026-01-18 02:43:49 C 23 50 58.704 +21 11 19.07 V 703
2026-01-18 02:47:05 C 23 50 59.240 +21 11 24.86 V 703
2026-01-19 02:27:26 C 23 55 35.022 +21 58 37.09 V 703
2026-01-19 02:33:59 C 23 55 36.278 +21 58 50.38 V 703
2026-01-19 02:37:16 C 23 55 36.836 +21 58 56.93 V 703
2026-01-21 02:30:07 C 00 04 59.358 +23 32 10.00 V 703
2026-01-21 02:33:24 C 00 04 59.970 +23 32 16.98 V 703
2026-01-21 02:36:40 C 00 05 00.654 +23 32 23.32 V 703
2026-01-21 02:39:57 C 00 05 01.288 +23 32 29.58 V 703
2026-01-21 05:47:11 C 00 05 38.062 +23 38 30.34 V T05
2026-01-21 05:51:45 C 00 05 38.942 +23 38 38.51 V T05
2026-01-21 05:59:39 C 00 05 40.541 +23 38 53.88 V T05
2026-01-21 06:15:25 C 00 05 43.565 +23 39 23.90 V T05
2026-01-28 05:45:55 C 00 39 27.674 +28 38 45.89 V T05
2026-01-28 06:03:38 C 00 39 31.265 +28 39 15.44 V T05
2026-01-28 06:08:14 C 00 39 32.237 +28 39 22.68 V T05
2026-01-28 06:16:05 C 00 39 33.852 +28 39 36.47 V T05
2026-01-28 06:37:04 C 00 39 38.054 +28 40 09.95 V T05
2026-02-04 02:46:55 C 01 14 05.284 +32 49 28.31 V 703
2026-02-04 02:50:10 C 01 14 06.018 +32 49 33.82 V 703
2026-02-04 02:53:26 C 01 14 06.673 +32 49 38.14 V 703
2026-02-04 02:56:42 C 01 14 07.408 +32 49 42.82 V 703
2026-02-04 06:15:18 C 01 14 49.764 +32 54 17.64 V T05
2026-02-04 06:20:33 C 01 14 50.755 +32 54 24.30 V T05
2026-02-04 06:29:06 C 01 14 52.598 +32 54 36.22 V T05
2026-02-04 06:57:25 C 01 14 58.632 +32 55 14.38 V T05
2026-02-05 03:02:01 C 01 19 17.220 +33 22 23.09 V 703
2026-02-05 03:04:57 C 01 19 17.951 +33 22 26.26 V 703
2026-02-05 03:07:53 C 01 19 18.484 +33 22 29.75 V 703
2026-02-05 03:10:49 C 01 19 19.128 +33 22 33.46 V 703
2026-02-05 13:50:43 C 01 21 36.847 +33 36 40.53 W O18
2026-02-05 14:26:50 C 01 21 44.564 +33 37 27.24 W O18
2026-02-07 03:07:53 C 01 29 40.646 +34 24 31.82 V 703
2026-02-07 03:11:12 C 01 29 41.323 +34 24 36.47 V 703
2026-02-07 03:14:32 C 01 29 42.047 +34 24 39.82 V 703
2026-02-07 03:17:51 C 01 29 42.803 +34 24 43.88 V 703
2026-02-09 02:46:52 C 01 40 04.033 +35 22 03.61 V 703
2026-02-09 02:50:12 C 01 40 04.699 +35 22 07.43 V 703
2026-02-09 02:56:49 C 01 40 06.150 +35 22 12.43 V 703
2026-02-10 13:51:06 C 01 47 46.107 +36 01 44.74 W O18
2026-02-10 14:42:57 C 01 47 57.411 +36 02 40.35 W O18
2026-02-14 06:10:14 C 02 07 20.633 +37 32 05.21 V T05
2026-02-14 06:17:33 C 02 07 22.166 +37 32 11.47 V T05
2026-02-14 06:21:32 C 02 07 23.093 +37 32 15.36 V T05
2026-02-14 06:36:47 C 02 07 26.484 +37 32 30.01 V T05
2026-02-15 03:31:24 C 02 12 06.527 +37 51 46.40 V 703
2026-02-15 03:34:54 C 02 12 07.355 +37 51 48.96 V 703
2026-02-15 03:38:24 C 02 12 08.028 +37 51 52.45 V 703
2026-02-15 03:41:53 C 02 12 08.885 +37 51 55.19 V 703
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1990-11-19 17:00:00 -11375 1 Hz 2380 -1 -1
1990-11-19.708333 -1137500 100 Hz 2380 251 251
Station codes
-1 Arecibo (305-m, 1963–2020)