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
2009-01-30 18:21:34 C 01 06 34.17 +36 51 33.9 r B60
2009-01-30 18:29:04 C 01 06 35.89 +36 51 44.3 r B60
2009-01-30 18:36:21 C 01 06 37.49 +36 51 54.3 r B60
2009-01-30 18:36:57 C 01 06 37.65 +36 51 55.2 r B60
2009-02-04 02:56:37 C 01 30 39.85 +39 03 12.7 r 703
2009-02-04 03:13:28 C 01 30 43.59 +39 03 31.7 r 703
2009-02-04 03:21:59 C 01 30 45.61 +39 03 40.5 r 703
2009-02-14 02:10:07 C 02 27 19.53 +42 39 48.0 19.1 c 704
2009-02-14 02:26:47 C 02 27 23.38 +42 39 57.4 18.9 c 704
2009-02-14 02:43:50 C 02 27 27.44 +42 40 08.3 18.8 c 704
2009-02-14 03:00:40 C 02 27 31.39 +42 40 18.7 18.5 c 704
2009-02-14 03:17:30 C 02 27 35.37 +42 40 29.9 18.7 c 704
2010-02-17 02:50:34 C 01 38 58.77 +27 07 25.9 r 703
2010-02-17 02:58:52 C 01 39 00.46 +27 07 36.0 r 703
2010-02-17 03:07:13 C 01 39 02.05 +27 07 47.3 r 703
2010-02-17 03:15:35 C 01 39 03.67 +27 07 57.9 r 703
2020-01-26 15:30:43 C 15 31 49.750 -14 41 52.39 U F51
2020-01-26 15:37:10 C 15 31 50.456 -14 41 56.98 U F51
2020-01-26 15:43:37 C 15 31 51.179 -14 42 01.57 U F51
2020-07-19 11:19:25 C 04 34 58.51 +15 43 29.1 U I41
2020-07-19 11:26:31 C 04 34 59.75 +15 43 38.1 U I41
2020-07-19 11:33:37 C 04 35 00.99 +15 43 46.9 U I41
2020-07-19 11:40:43 C 04 35 02.22 +15 43 55.9 U I41
2020-07-25 11:24:02 C 05 00 21.32 +18 33 51.2 U I41
2020-07-25 11:31:19 C 05 00 22.60 +18 33 59.3 U I41
2020-07-25 11:38:36 C 05 00 23.89 +18 34 07.4 U I41
2020-07-25 11:45:54 C 05 00 25.19 +18 34 15.7 U I41
2020-07-27 11:27:04 C 05 08 56.89 +19 25 41.3 U I41
2020-07-27 11:34:24 C 05 08 58.22 +19 25 49.1 U I41
2020-07-27 11:41:47 C 05 08 59.56 +19 25 56.7 U I41
2020-07-27 11:49:10 C 05 09 00.86 +19 26 04.8 U I41
2020-08-02 11:34:53 C 05 35 05.54 +21 45 10.7 U I41
2020-08-02 11:42:16 C 05 35 06.86 +21 45 16.9 U I41
2020-08-02 11:49:41 C 05 35 08.25 +21 45 23.7 U I41
2020-08-02 11:57:04 C 05 35 09.58 +21 45 30.6 U I41
2020-08-06 11:36:43 C 05 52 46.84 +23 04 14.9 U I41
2020-08-06 11:43:48 C 05 52 48.14 +23 04 20.5 U I41
2020-08-06 11:50:54 C 05 52 49.47 +23 04 26.1 U I41
2020-08-06 11:57:59 C 05 52 50.81 +23 04 31.5 U I41
2020-08-12 11:40:56 C 06 19 36.20 +24 41 21.6 U I41
2020-08-12 11:45:12 C 06 19 37.00 +24 41 24.4 U I41
2020-08-12 11:48:02 C 06 19 37.52 +24 41 25.9 U I41
2020-08-12 11:52:18 C 06 19 38.31 +24 41 28.4 U I41
2020-08-12 11:55:07 C 06 19 38.84 +24 41 30.1 U I41
2020-08-12 11:59:24 C 06 19 39.66 +24 41 32.5 U I41
2020-08-12 12:02:14 C 06 19 40.18 +24 41 34.2 U I41
2020-08-12 12:09:21 C 06 19 41.50 +24 41 38.8 U I41
2020-09-15 12:08:47 C 08 47 18.14 +26 15 40.4 U I41
2020-09-15 12:15:33 C 08 47 19.28 +26 15 38.5 U I41
2020-09-15 12:22:22 C 08 47 20.42 +26 15 36.5 U I41
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)