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
2022-02-27 16:22:56 V 15 20 58.08 +28 22 49.5 14.3 V 270
2022-02-27 16:22:56 v 1 134.17900 +34.51188 270
2022-02-27 16:35:27 V 15 21 12.42 +28 22 38.0 14.2 V 270
2022-02-27 16:35:27 v 1 134.17900 +34.51188 270
2022-02-27 17:02:23 V 15 21 42.15 +28 22 15.2 14.2 V 270
2022-02-27 17:02:23 v 1 140.17433 +36.06245 270
2022-02-27 17:13:38 V 15 21 54.98 +28 22 04.4 14.3 V 270
2022-02-27 17:13:38 v 1 140.17433 +36.06245 270
2022-02-27 17:24:33 V 15 22 07.45 +28 21 54.3 14.2 V 270
2022-02-27 17:24:33 v 1 140.17433 +36.06245 270
2022-02-27 17:35:29 V 15 22 20.01 +28 21 44.0 14.3 V 270
2022-02-27 17:35:29 v 1 140.17433 +36.06245 270
2022-02-28 02:47:24 C 15 33 38.21 +28 07 54.7 V L65
2022-02-28 03:00:58 C 15 33 55.05 +28 07 33.4 V L65
2022-02-28 03:13:21 C 15 34 10.52 +28 07 13.5 V L65
2022-02-28 13:18:28 C 15 47 44.90 +27 48 39.0 V T05
2022-02-28 13:22:27 C 15 47 50.24 +27 48 30.5 V T05
2022-02-28 13:27:03 C 15 47 56.41 +27 48 20.7 V T05
2022-03-01 02:17:27 C 16 06 40.26 +27 09 40.7 V L65
2022-03-01 02:29:14 C 16 06 57.81 +27 09 02.5 V L65
2022-03-01 02:43:24 C 16 07 19.07 +27 08 16.3 V L65
2022-03-01 02:50:04 C 16 07 29.82 +27 08 00.1 V K85
2022-03-01 02:59:04 C 16 07 43.32 +27 07 30.2 V K85
2022-03-01 08:11:53 V 16 16 01.46 +26 48 17.9 14.1 V 270
2022-03-01 08:11:53 v 1 242.88217 +32.74569 270
2022-03-01 08:54:14 V 16 17 08.49 +26 45 45.4 14.1 V 270
2022-03-01 08:54:14 v 1 242.88217 +32.74569 270
2022-03-01 09:22:00 V 16 17 52.33 +26 44 01.8 14.1 V 270
2022-03-01 09:22:00 v 1 242.88217 +32.74569 270
2022-03-01 09:43:30 V 16 18 26.70 +26 42 55.2 13.8 V 270
2022-03-01 09:43:30 v 1 242.88217 +32.74569 270
2022-03-01 13:30:41 C 16 24 35.10 +26 27 33.9 V T08
2022-03-01 13:35:20 C 16 24 42.52 +26 27 14.3 V T08
2022-03-01 13:49:43 C 16 25 05.50 +26 26 12.9 V T08
2022-03-01 14:02:22 C 16 25 25.69 +26 25 18.6 V T08
2022-03-01 22:32:07 C 16 39 54.64 +25 40 22.3 V C40
2022-03-01 22:34:15 C 16 39 58.34 +25 40 11.0 V C40
2022-03-01 22:34:58 C 16 39 59.56 +25 40 07.4 V C40
2022-03-01 22:37:05 C 16 40 03.24 +25 39 56.4 V C40
2022-03-01 22:37:48 C 16 40 04.46 +25 39 52.7 V C40
2022-03-01 22:38:30 C 16 40 05.68 +25 39 49.0 V C40
2022-03-01 22:39:39 C 16 40 07.67 +25 39 42.9 V C40
2022-03-01 22:40:48 C 16 40 09.65 +25 39 36.8 V C40
2022-03-01 22:42:31 C 16 40 12.61 +25 39 28.0 V C40
2022-03-01 22:49:24 C 16 40 24.46 +25 38 52.1 V C40
2022-03-01 22:49:59 C 16 40 25.47 +25 38 49.0 V C40
2022-03-01 22:51:08 C 16 40 27.45 +25 38 43.0 V C40
2022-03-01 22:54:33 C 16 40 33.36 +25 38 25.0 V C40
2022-03-01 22:57:13 C 16 40 37.95 +25 38 11.1 V C40
2022-03-01 22:57:48 C 16 40 38.95 +25 38 08.2 V C40
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)