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
2022-02-11 20:55:14 C 12 47 03.70 +25 21 13.7 V C40
2022-02-11 20:58:39 C 12 47 04.08 +25 21 17.7 q B18
2022-02-11 20:59:47 C 12 47 04.24 +25 21 18.3 V B18
2022-02-11 20:59:51 C 12 47 04.30 +25 21 16.1 V C40
2022-02-11 21:01:22 C 12 47 04.50 +25 21 16.9 V C40
2022-02-11 21:04:27 C 12 47 04.90 +25 21 18.3 V C40
2022-02-11 21:06:01 C 12 47 05.11 +25 21 19.2 V C40
2022-02-11 21:07:32 C 12 47 05.31 +25 21 19.9 V C40
2022-02-11 21:15:15 C 12 47 06.31 +25 21 23.8 V C40
2022-02-11 21:18:20 C 12 47 06.71 +25 21 25.3 V C40
2022-02-11 21:19:53 C 12 47 06.92 +25 21 26.2 V C40
2022-02-11 21:21:25 C 12 47 07.12 +25 21 26.9 V C40
2022-02-11 21:22:58 C 12 47 07.31 +25 21 27.8 V C40
2022-02-11 21:26:03 C 12 47 07.71 +25 21 29.2 V C40
2022-02-11 21:27:36 C 12 47 07.93 +25 21 30.0 V C40
2022-02-11 21:29:08 C 12 47 08.13 +25 21 30.9 V C40
2022-02-11 21:35:19 C 12 47 08.92 +25 21 33.8 V C40
2022-02-11 21:38:08 C 12 47 09.28 +25 21 35.2 V C40
2022-02-11 21:39:41 C 12 47 09.49 +25 21 36.1 V C40
2022-02-11 21:44:19 C 12 47 10.10 +25 21 38.2 V C40
2022-02-11 21:48:55 C 12 47 10.70 +25 21 40.6 V C40
2022-02-11 21:50:29 C 12 47 10.88 +25 21 41.2 V C40
2022-02-11 21:52:00 C 12 47 11.09 +25 21 42.1 V C40
2022-02-11 21:53:33 C 12 47 11.28 +25 21 42.9 V C40
2022-02-11 21:56:38 C 12 47 11.68 +25 21 44.4 V C40
2022-02-11 22:48:45 C 12 47 19.31 +25 21 57.9 V K85
2022-02-11 22:56:46 C 12 47 20.37 +25 22 01.6 V K85
2022-02-11 23:55:07 C 12 47 28.11 +25 22 30.1 V C23
2022-02-11 23:58:22 C 12 47 28.53 +25 22 31.9 V C23
2022-02-12 00:03:45 C 12 47 29.25 +25 22 34.5 V C23
2022-02-12 01:12:25 C 12 47 38.04 +25 23 09.6 V A17
2022-02-12 01:23:46 C 12 47 39.51 +25 23 14.9 V A17
2022-02-12 01:35:09 C 12 47 40.97 +25 23 20.3 V A17
2022-02-12 10:46:09 C 12 49 01.53 +25 27 51.2 V T05
2022-02-12 10:50:09 C 12 49 02.04 +25 27 53.4 V T05
2022-02-12 10:59:55 C 12 49 03.33 +25 27 58.4 V T05
2022-02-12 11:14:28 C 12 49 05.22 +25 28 06.1 V T05
2022-02-12 15:46:09 V 12 49 44.16 +25 29 55.2 15.7 V 270
2022-02-12 15:46:09 v 1 140.24134 +36.07306 270
2022-02-12 16:23:52 V 12 49 49.25 +25 30 14.4 16.0 V 270
2022-02-12 16:23:52 v 1 140.24134 +36.07306 270
2022-02-12 17:21:53 V 12 49 56.84 +25 30 43.5 15.9 V 270
2022-02-12 17:21:53 v 1 140.24134 +36.07306 270
2022-02-12 18:04:59 V 12 50 02.55 +25 31 00.7 15.3 V 270
2022-02-12 18:04:59 v 1 140.24134 +36.07306 270
2022-02-13 02:33:54 C 12 51 18.78 +25 34 45.3 X K87
2022-02-13 02:36:00 C 12 51 19.08 +25 34 46.5 X K87
2022-02-13 02:38:06 C 12 51 19.36 +25 34 47.4 X K87
2022-02-13 07:20:36 C 12 52 05.84 +25 37 08.3 U I41
2022-02-13 07:29:40 C 12 52 07.14 +25 37 13.3 U I41
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)