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
2022-03-01 22:58:56 C 16 40 40.91 +25 38 02.1 V C40
2022-03-01 23:01:14 C 16 40 44.88 +25 37 50.0 V C40
2022-03-01 23:04:06 C 16 40 49.81 +25 37 34.9 V C40
2022-03-01 23:06:25 C 16 40 53.78 +25 37 22.6 V C40
2022-03-01 23:07:34 C 16 40 55.77 +25 37 16.5 V C40
2022-03-01 23:09:52 C 16 40 59.74 +25 37 04.6 V C40
2022-03-01 23:10:26 C 16 41 00.70 +25 37 01.4 V C40
2022-03-01 23:12:44 C 16 41 04.67 +25 36 49.3 V C40
2022-03-01 23:14:21 C 16 41 07.46 +25 36 40.8 V C40
2022-03-01 23:15:30 C 16 41 09.45 +25 36 34.6 V C40
2022-03-01 23:18:23 C 16 41 14.41 +25 36 19.3 V C40
2022-03-01 23:23:33 C 16 41 23.31 +25 35 52.0 V C40
2022-03-01 23:24:42 C 16 41 25.30 +25 35 45.6 V C40
2022-03-01 23:28:34 C 16 41 31.97 +25 35 24.9 V C40
2022-03-01 23:29:09 C 16 41 32.95 +25 35 21.9 V C40
2022-03-01 23:29:43 C 16 41 33.94 +25 35 18.9 V C40
2022-03-01 23:31:26 C 16 41 36.90 +25 35 09.7 V C40
2022-03-01 23:32:01 C 16 41 37.90 +25 35 06.6 V C40
2022-03-01 23:33:10 C 16 41 39.88 +25 35 00.6 V C40
2022-03-01 23:37:45 C 16 41 47.77 +25 34 36.0 V C40
2022-03-01 23:38:19 C 16 41 48.75 +25 34 32.8 V C40
2022-03-02 16:58:11 V 17 13 29.36 +23 39 07.3 14.4 V 270
2022-03-02 16:58:11 v 1 134.17944 +34.51167 270
2022-03-02 17:06:24 V 17 13 44.66 +23 38 06.3 14.4 V 270
2022-03-02 17:06:24 v 1 134.17944 +34.51167 270
2022-03-02 17:14:36 V 17 13 59.94 +23 37 04.4 14.3 V 270
2022-03-02 17:14:36 v 1 134.17944 +34.51167 270
2022-03-02 17:22:49 V 17 14 15.27 +23 36 03.0 14.7 V 270
2022-03-02 17:22:49 v 1 134.17944 +34.51167 270
2022-03-02 20:12:35 C 17 19 30.63 +23 14 06.4 q P87
2022-03-02 20:13:52 C 17 19 32.98 +23 13 55.9 q P87
2022-03-02 20:16:03 C 17 19 37.02 +23 13 39.0 q P87
2022-03-02 20:17:33 C 17 19 39.81 +23 13 26.2 q P87
2022-03-03 02:38:15 C 17 31 56.83 +22 17 21.0 V K85
2022-03-03 02:47:56 C 17 32 14.48 +22 15 50.4 V L65
2022-03-03 03:01:57 C 17 32 41.27 +22 13 46.5 V L65
2022-03-03 03:14:08 C 17 33 04.52 +22 11 58.2 V L65
2022-03-03 03:33:14 C 17 33 41.87 +22 09 14.1 V K85
2022-03-03 10:32:15 V 17 47 21.01 +21 03 55.9 14.6 V 270
2022-03-03 10:32:15 v 1 276.64257 +33.90554 270
2022-03-03 10:40:36 V 17 47 36.93 +21 02 33.4 14.7 V 270
2022-03-03 10:40:36 v 1 276.64257 +33.90554 270
2022-03-03 10:48:32 V 17 47 52.04 +21 01 16.2 14.5 V 270
2022-03-03 10:48:32 v 1 276.64257 +33.90554 270
2022-03-03 10:56:41 V 17 48 07.50 +20 59 56.0 14.7 V 270
2022-03-03 10:56:41 v 1 276.64257 +33.90554 270
2022-03-03 16:10:03 C 17 58 32.81 +20 04 56.5 q Q21
2022-03-03 16:13:02 C 17 58 38.55 +20 04 26.8 q Q21
2022-03-03 18:02:10 V 18 02 13.15 +19 45 19.5 15.0 V 270
2022-03-03 18:02:10 v 1 134.17915 +34.51213 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)