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
2022-01-28 12:28:29 C 12 12 26.76 +23 36 22.9 V T08
2022-01-28 12:37:08 C 12 12 27.38 +23 36 24.6 V T08
2022-01-29 23:44:13 C 12 15 20.26 +23 43 20.4 V C23
2022-01-29 23:48:22 C 12 15 20.61 +23 43 21.4 V C23
2022-01-29 23:54:36 C 12 15 21.08 +23 43 22.9 V C23
2022-01-30 12:25:02 C 12 16 23.31 +23 46 29.3 V T05
2022-01-30 12:31:04 C 12 16 23.74 +23 46 30.8 V T05
2022-01-30 12:35:05 C 12 16 24.05 +23 46 31.8 V T05
2022-01-30 12:42:42 C 12 16 24.60 +23 46 33.7 V T05
2022-01-30 19:10:46 C 12 16 56.61 +23 47 54.3 V D29
2022-01-30 19:48:57 C 12 16 59.44 +23 48 03.2 V D29
2022-01-30 20:27:08 C 12 17 02.28 +23 48 11.6 V D29
2022-01-31 12:54:09 C 12 18 27.18 +23 52 10.6 V T08
2022-01-31 12:58:08 C 12 18 27.48 +23 52 11.5 V T08
2022-01-31 13:02:07 C 12 18 27.77 +23 52 12.5 V T08
2022-01-31 13:10:12 C 12 18 28.37 +23 52 14.4 V T08
2022-02-01 10:22:15 C 12 20 17.99 +23 57 16.9 V 703
2022-02-01 10:29:52 C 12 20 18.58 +23 57 18.8 V 703
2022-02-01 10:37:28 C 12 20 19.17 +23 57 20.8 V 703
2022-02-01 10:45:03 C 12 20 19.73 +23 57 22.7 V 703
2022-02-02 12:17:46 C 12 22 36.36 +24 04 06.5 V T08
2022-02-02 12:20:29 C 12 22 36.57 +24 04 07.2 V T08
2022-02-02 12:24:27 C 12 22 36.90 +24 04 08.5 V T08
2022-02-02 12:38:00 C 12 22 37.95 +24 04 12.4 V T08
2022-02-02 12:42:51 C 12 22 38.33 +24 04 14.0 V T08
2022-02-02 12:45:31 C 12 22 38.53 +24 04 14.6 V T08
2022-02-02 13:14:22 C 12 22 40.80 +24 04 22.9 V T08
2022-02-02 13:29:41 C 12 22 41.98 +24 04 27.1 V T08
2022-02-03 13:00:14 C 12 24 50.89 +24 10 52.8 V T05
2022-02-03 13:02:52 C 12 24 51.10 +24 10 53.6 V T05
2022-02-03 13:06:49 C 12 24 51.41 +24 10 54.8 V T05
2022-02-03 13:15:53 C 12 24 52.14 +24 10 57.5 V T05
2022-02-04 12:16:36 C 12 27 02.56 +24 17 35.6 V T05
2022-02-04 12:19:33 C 12 27 02.81 +24 17 36.6 V T05
2022-02-04 12:24:16 C 12 27 03.21 +24 17 38.1 V T05
2022-02-04 12:33:54 C 12 27 04.00 +24 17 41.4 V T05
2022-02-04 23:16:07 C 12 28 06.50 +24 20 27.0 V C23
2022-02-05 02:06:38 C 12 28 21.90 +24 21 24.0 V C23
2022-02-05 02:10:56 C 12 28 22.28 +24 21 25.4 V C23
2022-02-05 02:16:20 C 12 28 22.76 +24 21 26.8 V C23
2022-02-05 12:05:23 C 12 29 21.51 +24 24 51.8 V T08
2022-02-05 12:11:13 C 12 29 22.02 +24 24 53.8 V T08
2022-02-05 12:26:51 C 12 29 23.38 +24 24 59.3 V T08
2022-02-05 12:30:50 C 12 29 23.71 +24 25 00.4 V T08
2022-02-05 17:19:00 C 12 29 53.29 +24 26 01.0 X N82
2022-02-05 17:43:41 C 12 29 55.64 +24 26 10.3 X N82
2022-02-05 18:07:21 C 12 29 57.90 +24 26 18.6 X N82
2022-02-05 18:29:59 C 12 30 00.01 +24 26 26.6 X N82
2022-02-05 18:52:36 C 12 30 02.09 +24 26 34.9 X N82
2022-02-05 19:15:15 C 12 30 04.18 +24 26 42.8 X N82
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)