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
2006-10-16 11:34:45 C 21 50 29.03 +25 18 14.4 r 379
2006-10-16 17:34:37 C 21 52 22.71 +25 13 35.2 r 113
2006-10-16 17:35:27 C 21 52 22.95 +25 13 34.6 r 113
2006-10-16 17:36:09 C 21 52 23.14 +25 13 34.1 r 113
2006-10-16 17:36:49 C 21 52 23.34 +25 13 33.7 r 113
2006-10-16 17:37:32 C 21 52 23.54 +25 13 33.2 r 113
2006-10-16 17:44:51 C 21 52 26.03 +25 13 31.7 o 151
2006-10-16 17:45:47 C 21 52 26.30 +25 13 31.1 o 151
2006-10-16 17:46:43 C 21 52 26.57 +25 13 30.4 o 151
2006-10-16 17:47:36 C 21 52 26.83 +25 13 29.9 o 151
2006-10-16 17:48:33 C 21 52 27.09 +25 13 29.3 o 151
2006-10-16 17:49:27 C 21 52 27.35 +25 13 28.8 o 151
2006-10-16 17:50:21 C 21 52 27.62 +25 13 28.0 o 151
2006-10-16 18:36:04 C 21 52 40.85 +25 12 53.1 c 127
2006-10-16 18:39:53 C 21 52 41.96 +25 12 50.6 c 127
2006-10-16 18:43:03 C 21 52 42.88 +25 12 48.4 c 127
2006-10-16 18:46:04 C 21 52 43.76 +25 12 46.2 c 127
2006-10-16 19:42:09 C 21 52 59.14 +25 12 10.0 r A97
2006-10-16 19:49:24 C 21 53 01.31 +25 12 03.9 r A97
2006-10-16 20:04:58 C 21 53 05.71 +25 11 51.8 r A97
2006-10-16 20:08:43 C 21 53 07.60 +25 11 47.4 r 145
2006-10-16 20:08:53 C 21 53 07.08 +25 11 47.3 o 639
2006-10-16 20:11:17 C 21 53 07.77 +25 11 45.5 o 639
2006-10-16 20:11:49 C 21 53 08.49 +25 11 45.2 r 145
2006-10-16 20:13:56 C 21 53 09.09 +25 11 43.7 r 145
2006-10-16 20:14:11 C 21 53 08.39 +25 11 45.8 r A97
2006-10-16 20:16:03 C 21 53 09.69 +25 11 42.2 r 145
2006-10-16 20:17:31 C 21 53 09.55 +25 11 41.0 o 639
2006-10-16 20:18:14 C 21 53 09.54 +25 11 43.0 r A97
2006-10-16 20:19:57 C 21 53 10.81 +25 11 39.4 r 145
2006-10-16 20:22:16 C 21 53 10.71 +25 11 40.5 r A97
2006-10-16 20:28:21 C 21 53 12.63 +25 11 33.1 o 639
2006-10-17 11:11:36 C 21 57 31.40 +25 01 34.5 r 379
2006-10-17 11:14:15 C 21 57 32.10 +25 01 32.7 r 379
2006-10-17 11:16:56 C 21 57 32.77 +25 01 30.4 r 379
2006-10-17 11:20:15 C 21 57 33.66 +25 01 28.1 r 379
2006-10-17 11:22:56 C 21 57 34.35 +25 01 26.0 r 379
2006-10-17 11:25:35 C 21 57 35.06 +25 01 24.6 r 379
2006-10-17 11:28:15 C 21 57 35.76 +25 01 22.8 r 379
2006-10-17 11:31:31 C 21 57 36.61 +25 01 20.3 r 379
2006-10-17 11:34:12 C 21 57 37.32 +25 01 18.0 r 379
2006-10-17 17:27:15 C 21 59 18.07 +24 56 51.4 r 113
2006-10-17 17:27:55 C 21 59 18.25 +24 56 50.9 r 113
2006-10-17 17:28:44 C 21 59 18.46 +24 56 50.3 r 113
2006-10-17 17:29:24 C 21 59 18.64 +24 56 49.9 r 113
2006-10-17 17:38:46 C 21 59 21.41 +24 56 47.0 o 151
2006-10-17 17:39:40 C 21 59 21.64 +24 56 46.5 o 151
2006-10-17 17:40:32 C 21 59 21.87 +24 56 45.9 o 151
2006-10-17 17:42:19 C 21 59 22.33 +24 56 44.8 o 151
2006-10-17 17:43:13 C 21 59 22.57 +24 56 44.2 o 151
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)