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
2022-02-24 14:36:53 v 1 130.69568 +31.75611 270
2022-02-24 14:39:04 C 14 16 02.48 +28 26 48.0 V T05
2022-02-24 15:01:07 C 14 16 15.70 +28 26 59.5 V T05
2022-02-24 15:11:02 C 14 16 21.67 +28 27 04.4 V T05
2022-02-24 15:18:00 C 14 16 25.86 +28 27 07.8 V T05
2022-02-24 15:55:50 C 14 16 48.76 +28 27 25.2 V T05
2022-02-25 09:16:18 V 14 29 01.46 +28 34 44.7 14.3 V 270
2022-02-25 09:16:18 v 1 242.88220 +32.74567 270
2022-02-25 09:29:24 V 14 29 10.78 +28 34 52.1 14.2 V 270
2022-02-25 09:29:24 v 1 242.88220 +32.74567 270
2022-02-25 09:42:31 V 14 29 20.14 +28 34 58.7 14.0 V 270
2022-02-25 09:42:31 v 1 242.88220 +32.74567 270
2022-02-25 09:54:53 V 14 29 28.88 +28 35 04.8 14.2 V 270
2022-02-25 09:54:53 v 1 242.88220 +32.74567 270
2022-02-25 14:04:43 V 14 32 43.29 +28 35 43.4 14.1 V 270
2022-02-25 14:04:43 v 1 134.17952 +34.51215 270
2022-02-25 14:17:17 V 14 32 52.85 +28 35 50.7 14.2 V 270
2022-02-25 14:17:17 v 1 134.17952 +34.51215 270
2022-02-25 14:29:12 V 14 33 01.96 +28 35 56.6 14.4 V 270
2022-02-25 14:29:12 v 1 134.17952 +34.51215 270
2022-02-25 14:32:02 C 14 32 55.11 +28 37 20.0 V T08
2022-02-25 14:41:47 V 14 33 11.58 +28 36 03.6 14.3 V 270
2022-02-25 14:41:47 v 1 134.17952 +34.51215 270
2022-02-25 15:12:29 C 14 33 24.65 +28 37 31.1 V T08
2022-02-25 15:47:05 C 14 33 50.09 +28 37 38.6 V T08
2022-02-25 15:51:49 C 14 33 53.57 +28 37 39.4 V T08
2022-02-25 16:12:29 V 14 34 19.58 +28 36 51.1 14.1 V 270
2022-02-25 16:12:29 v 1 140.17300 +36.21433 270
2022-02-25 16:25:43 V 14 34 29.58 +28 36 56.8 14.3 V 270
2022-02-25 16:25:43 v 1 140.17300 +36.21433 270
2022-02-25 16:38:26 V 14 34 39.21 +28 37 02.4 14.4 V 270
2022-02-25 16:38:26 v 1 140.17300 +36.21433 270
2022-02-25 16:51:40 V 14 34 49.16 +28 37 07.3 14.4 V 270
2022-02-25 16:51:40 v 1 140.17300 +36.21433 270
2022-02-25 19:09:41 C 14 36 40.86 +28 36 22.7 q 168
2022-02-25 19:41:45 C 14 37 06.48 +28 36 34.9 q 168
2022-02-25 20:05:47 C 14 37 25.67 +28 36 44.1 q 168
2022-02-25 23:11:53 C 14 40 00.15 +28 37 22.3 V C23
2022-02-25 23:17:38 C 14 40 04.90 +28 37 24.5 V C23
2022-02-25 23:22:35 C 14 40 08.94 +28 37 26.2 V C23
2022-02-26 01:38:01 C 14 42 01.03 +28 38 02.7 V Y82
2022-02-26 02:08:50 C 14 42 26.52 +28 38 09.6 V Y82
2022-02-26 02:30:20 C 14 42 44.23 +28 38 14.2 V Y82
2022-02-26 02:38:36 C 14 42 51.12 +28 38 15.7 V Y82
2022-02-26 02:44:29 C 14 42 55.92 +28 38 17.1 V Y82
2022-02-26 02:45:24 C 14 42 56.68 +28 38 17.1 V Y82
2022-02-26 02:50:04 C 14 43 00.57 +28 38 18.2 V Y82
2022-02-26 02:55:40 C 14 43 05.20 +28 38 18.9 V Y82
2022-02-26 03:00:12 C 14 43 08.95 +28 38 20.0 V Y82
2022-02-26 03:01:16 C 14 43 09.81 +28 38 20.0 V Y82
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)