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
2022-02-05 19:37:52 C 12 30 06.32 +24 26 50.8 X N82
2022-02-05 20:00:30 C 12 30 08.36 +24 26 58.8 X N82
2022-02-05 20:23:08 C 12 30 10.45 +24 27 05.9 X N82
2022-02-05 20:45:48 C 12 30 12.50 +24 27 13.6 X N82
2022-02-06 09:01:33 C 12 31 27.90 +24 31 23.6 V 703
2022-02-06 09:09:08 C 12 31 28.60 +24 31 26.4 V 703
2022-02-06 09:16:43 C 12 31 29.28 +24 31 29.0 V 703
2022-02-06 09:24:18 C 12 31 29.98 +24 31 31.7 V 703
2022-02-06 12:30:51 C 12 31 49.19 +24 32 43.6 V T08
2022-02-06 12:33:34 C 12 31 49.43 +24 32 44.7 V T08
2022-02-06 13:05:36 C 12 31 52.29 +24 32 55.9 V T08
2022-02-06 13:10:54 C 12 31 52.77 +24 32 57.8 V T08
2022-02-07 11:17:54 C 12 34 14.09 +24 40 22.5 V T05
2022-02-07 11:20:33 C 12 34 14.34 +24 40 23.8 V T05
2022-02-07 11:24:31 C 12 34 14.67 +24 40 24.7 V T05
2022-02-07 11:26:30 C 12 34 14.90 +24 40 26.1 V T05
2022-02-07 11:27:10 C 12 34 14.97 +24 40 26.1 V T05
2022-02-07 11:30:29 C 12 34 15.28 +24 40 27.7 V T05
2022-02-07 11:31:09 C 12 34 15.36 +24 40 27.9 V T05
2022-02-07 11:32:29 C 12 34 15.48 +24 40 28.4 V T05
2022-02-07 11:35:47 C 12 34 15.79 +24 40 29.7 V T05
2022-02-07 11:48:39 C 12 34 17.02 +24 40 34.9 V T05
2022-02-07 11:51:56 C 12 34 17.35 +24 40 36.0 V T05
2022-02-08 08:24:57 C 12 36 33.02 +24 47 43.2 V 703
2022-02-08 08:32:30 C 12 36 33.76 +24 47 46.3 V 703
2022-02-08 08:40:03 C 12 36 34.55 +24 47 49.4 V 703
2022-02-08 08:47:34 C 12 36 35.28 +24 47 52.4 V 703
2022-02-08 12:20:47 C 12 36 59.09 +24 49 21.7 V T05
2022-02-08 12:25:25 C 12 36 59.55 +24 49 23.5 V T05
2022-02-08 12:29:23 C 12 36 59.94 +24 49 25.1 V T05
2022-02-08 12:37:16 C 12 37 00.71 +24 49 28.2 V T05
2022-02-08 23:03:48 C 12 38 13.64 +24 52 59.2 V L92
2022-02-08 23:12:18 C 12 38 14.56 +24 53 03.7 V L92
2022-02-08 23:18:48 C 12 38 15.75 +24 53 01.2 X J57
2022-02-08 23:23:02 C 12 38 15.73 +24 53 07.9 V L92
2022-02-08 23:33:47 C 12 38 16.84 +24 53 12.5 V L92
2022-02-09 00:31:09 C 12 38 23.60 +24 53 32.6 X J57
2022-02-09 01:43:44 C 12 38 31.28 +24 54 03.0 X J57
2022-02-09 02:44:04 C 12 38 37.58 +24 54 27.2 X J57
2022-02-09 03:49:16 C 12 38 44.36 +24 54 52.1 X J57
2022-02-09 04:54:28 C 12 38 51.18 +24 55 15.7 X J57
2022-02-09 05:37:14 C 12 38 55.71 +24 55 30.5 X J57
2022-02-09 13:48:32 C 12 39 55.59 +24 59 00.9 V T08
2022-02-09 14:31:07 C 12 40 00.01 +24 59 17.0 V T08
2022-02-09 14:35:11 C 12 40 00.43 +24 59 18.6 V T08
2022-02-09 14:43:12 C 12 40 01.27 +24 59 21.5 V T08
2022-02-09 22:56:05 C 12 41 03.95 +25 02 06.7 V L54
2022-02-09 23:33:29 C 12 41 08.18 +25 02 23.2 V L54
2022-02-10 00:10:19 C 12 41 12.31 +25 02 39.0 V L54
2022-02-10 11:11:17 C 12 42 35.88 +25 07 26.3 V T08
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)