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
2023-03-29 17:38:30 C 11 52 13.52 +22 33 16.1 q 168
2023-03-29 18:50:30 C 11 52 01.54 +22 32 29.8 q 168
2023-03-29 19:59:31 C 11 51 50.04 +22 31 45.2 q 168
2023-03-30 03:27:22 C 11 50 38.059 +22 27 26.53 V W68
2023-03-30 03:33:18 C 11 50 37.046 +22 27 22.50 V W68
2023-03-30 03:40:34 C 11 50 35.830 +22 27 17.68 V W68
2023-03-30 08:25:28 C 11 49 50.395 +22 23 46.46 V T05
2023-03-30 08:30:01 C 11 49 49.634 +22 23 43.66 V T05
2023-03-30 08:52:44 C 11 49 45.818 +22 23 28.46 V T05
2023-03-30 09:03:42 C 11 49 43.966 +22 23 21.19 V T05
2023-03-30 14:00:45 C 11 48 56.56 +22 19 53.8 V D29
2023-03-30 14:21:07 C 11 48 53.16 +22 19 40.1 V D29
2023-03-30 14:41:28 C 11 48 49.76 +22 19 26.3 V D29
2023-04-01 08:34:28 C 11 42 14.042 +21 49 29.96 V T05
2023-04-01 08:39:42 C 11 42 13.198 +21 49 26.15 V T05
2023-04-01 08:47:31 C 11 42 11.935 +21 49 19.45 V T05
2023-04-02 21:43:17 B 11 36 34.44 +21 20 23.5 V L65
2023-04-02 21:49:52 B 11 36 33.43 +21 20 18.2 V L65
2023-04-02 21:56:27 B 11 36 32.43 +21 20 12.9 V L65
2023-04-03 23:17:19 B 11 32 47.55 +20 59 23.3 V L65
2023-04-03 23:23:59 B 11 32 46.56 +20 59 17.9 V L65
2023-04-03 23:30:40 B 11 32 45.56 +20 59 12.5 V L65
2023-04-05 20:36:01 B 11 26 22.801 +20 20 11.91 X B72
2023-04-05 20:40:07 B 11 26 22.224 +20 20 08.56 X B72
2023-04-05 20:44:12 B 11 26 21.634 +20 20 04.59 X B72
2023-04-05 21:00:16 C 11 26 19.363 +20 19 54.70 V 160
2023-04-05 21:04:45 C 11 26 18.653 +20 19 47.46 V 160
2023-04-05 21:09:14 C 11 26 18.230 +20 19 45.73 V 160
2023-04-06 19:57:10 C 11 23 12.734 +19 59 08.30 V 160
2023-04-06 20:03:54 C 11 23 11.815 +19 59 00.35 V 160
2023-04-07 09:06:23 C 11 21 27.206 +19 47 10.72 V T05
2023-04-07 09:10:56 C 11 21 26.570 +19 47 06.61 V T05
2023-04-07 09:18:45 C 11 21 25.486 +19 46 59.20 V T05
2023-04-07 09:32:51 C 11 21 23.527 +19 46 46.02 V T05
2023-04-07 21:06:00 B 11 19 53.758 +19 35 46.28 X K74
2023-04-07 21:08:03 B 11 19 53.498 +19 35 44.41 X K74
2023-04-07 21:09:50 B 11 19 53.237 +19 35 42.83 X K74
2023-04-08 03:51:07 C 11 19 01.176 +19 29 56.29 V W68
2023-04-08 04:08:58 C 11 18 58.771 +19 29 39.12 V W68
2023-04-08 04:13:35 C 11 18 58.142 +19 29 34.76 V W68
2023-04-08 04:20:56 C 11 18 57.161 +19 29 27.64 V W68
2023-04-09 09:09:16 C 11 15 21.185 +19 01 32.34 V T05
2023-04-09 09:13:51 C 11 15 20.590 +19 01 27.88 V T05
2023-04-09 09:22:07 C 11 15 19.538 +19 01 19.81 V T05
2023-04-09 20:01:50 C 11 14 02.69 +18 50 46.8 V M26
2023-04-09 20:02:24 C 11 14 02.64 +18 50 46.7 V M26
2023-04-09 20:02:59 C 11 14 02.55 +18 50 45.9 V M26
2023-04-09 20:18:40 C 11 14 00.38 +18 50 29.4 V K88
2023-04-09 20:22:09 C 11 13 59.95 +18 50 25.9 V K88
2023-04-09 20:25:37 C 11 13 59.54 +18 50 22.5 V K88
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)