138971 (2001 CB21)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.3333956066 ± 2.78e-09
Semi-major axis (a)1.0335726681 AU ± 1.43e-10
Inclination (i)7.91834368° ± 6.35e-07
Long. of Asc. Node (Ω)353.64713274° ± 2.04e-06
Arg. of Perihelion (ω)271.93550869° ± 1.82e-06
Mean Anomaly (M)131.04916712° ± 8.25e-07
Mean Motion (n)0.9379954932°/day ± 1.95e-10
Perihelion dist (q)0.68898408 AU ± 2.87e-09
Aphelion dist (Q)1.37816125 AU ± 2.87e-09
Orbital Period1.05077934 yr ± 2.19e-10
Physical Parameters
H (abs. magnitude)18.54
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.368″
Uncertainty0
Orbit TypeApollo
MOID0.023880 AU
Observations Used2563
Radar Obs Used2
Oppositions1
Arc Total2001-2026
First Observation Used2001-02-02
Last Observation Used2026-01-13
Observations (3014)
Date Type RA Dec Mag Band Observatory
2022-02-26 03:06:52 C 14 43 14.47 +28 38 20.4 V Y82
2022-02-26 03:12:29 C 14 43 19.10 +28 38 21.4 V Y82
2022-02-26 03:15:01 C 14 43 21.21 +28 38 21.8 V Y82
2022-02-26 12:35:20 C 14 51 47.29 +28 39 31.2 V T08
2022-02-26 12:39:21 C 14 51 50.85 +28 39 31.5 V T08
2022-02-26 12:43:18 C 14 51 54.37 +28 39 31.6 V T08
2022-02-26 12:53:32 C 14 52 03.44 +28 39 32.0 V T08
2022-02-27 00:05:25 V 15 03 03.16 +28 34 24.7 14.2 V 270
2022-02-27 00:05:25 v 1 359.62622 +49.20373 270
2022-02-27 00:14:57 V 15 03 12.78 +28 34 22.7 14.2 V 270
2022-02-27 00:14:57 v 1 359.62622 +49.20373 270
2022-02-27 00:24:29 V 15 03 22.44 +28 34 18.8 14.3 V 270
2022-02-27 00:24:29 v 1 359.62622 +49.20373 270
2022-02-27 00:34:48 V 15 03 32.86 +28 34 16.7 14.1 V 270
2022-02-27 00:34:48 v 1 359.62622 +49.20373 270
2022-02-27 00:39:50 C 15 03 37.77 +28 34 09.8 V Y82
2022-02-27 00:45:35 C 15 03 43.65 +28 34 08.7 V Y82
2022-02-27 00:47:19 C 15 03 45.38 +28 34 08.4 V Y82
2022-02-27 00:50:55 C 15 03 49.05 +28 34 06.9 V Y82
2022-02-27 00:51:19 C 15 03 49.44 +28 34 07.3 V Y82
2022-02-27 00:55:30 C 15 03 53.66 +28 34 05.8 V Y82
2022-02-27 00:58:14 C 15 03 56.42 +28 34 05.5 V Y82
2022-02-27 00:59:18 C 15 03 57.52 +28 34 04.4 V Y82
2022-02-27 01:03:19 C 15 04 01.63 +28 34 03.7 V Y82
2022-02-27 01:06:55 C 15 04 05.25 +28 34 02.6 V Y82
2022-02-27 01:10:07 C 15 04 08.49 +28 34 01.5 V Y82
2022-02-27 06:24:26 V 15 09 43.53 +28 31 09.0 14.0 V 270
2022-02-27 06:24:26 v 1 271.85144 +42.96889 270
2022-02-27 06:53:50 V 15 10 14.11 +28 30 56.1 14.0 V 270
2022-02-27 06:53:50 v 1 271.85144 +42.96889 270
2022-02-27 07:35:32 V 15 10 58.61 +28 30 34.0 14.3 V 270
2022-02-27 07:35:32 v 1 271.85144 +42.96889 270
2022-02-27 07:54:11 V 15 11 18.40 +28 30 22.8 14.1 V 270
2022-02-27 07:54:11 v 1 271.85144 +42.96889 270
2022-02-27 10:41:22 C 15 14 21.15 +28 28 54.1 V 703
2022-02-27 10:48:58 C 15 14 29.31 +28 28 48.5 V 703
2022-02-27 10:56:33 C 15 14 37.45 +28 28 42.8 V 703
2022-02-27 11:04:08 C 15 14 45.57 +28 28 36.9 V 703
2022-02-27 11:08:41 C 15 14 50.58 +28 28 32.7 V 703
2022-02-27 11:16:13 C 15 14 58.68 +28 28 27.4 V 703
2022-02-27 11:23:45 C 15 15 06.83 +28 28 21.6 V 703
2022-02-27 11:31:17 C 15 15 14.82 +28 28 15.1 V 703
2022-02-27 14:19:05 C 15 18 27.55 +28 26 13.3 V T05
2022-02-27 14:21:43 C 15 18 30.44 +28 26 10.9 V T05
2022-02-27 14:25:39 C 15 18 34.79 +28 26 07.2 V T05
2022-02-27 14:35:00 C 15 18 45.06 +28 25 58.4 V T05
2022-02-27 15:56:04 V 15 20 27.39 +28 23 11.5 14.0 V 270
2022-02-27 15:56:04 v 1 134.17900 +34.51188 270
2022-02-27 16:09:58 V 15 20 43.28 +28 23 00.2 14.2 V 270
2022-02-27 16:09:58 v 1 134.17900 +34.51188 270
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2006-10-02 20:11:00 -9701.3065 0.5 Hz 2380 -1 -1
2006-10-02 21:29:00 47834014.65 1.5 us 2380 -1 -1
Station codes
-1 Arecibo (305-m, 1963–2020)