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
2006-10-12 17:46:51 C 21 15 14.80 +26 21 25.3 o 151
2006-10-13 01:09:52 C 21 18 46.86 +26 17 02.7 o H68
2006-10-13 01:19:12 C 21 18 51.05 +26 16 56.6 o H68
2006-10-13 01:27:36 C 21 18 54.77 +26 16 50.7 o H68
2006-10-13 01:35:16 C 21 18 58.23 +26 16 45.9 o H68
2006-10-13 01:45:18 C 21 19 02.65 +26 16 39.0 o H68
2006-10-13 01:50:44 C 21 19 05.05 +26 16 35.6 o H68
2006-10-13 18:50:07 C 21 26 45.28 +26 04 19.1 r J94
2006-10-13 18:56:26 C 21 26 47.88 +26 04 14.8 r J94
2006-10-13 19:19:15 C 21 26 57.07 +26 04 15.9 r 170
2006-10-13 19:21:38 C 21 26 58.04 +26 04 14.3 r 170
2006-10-13 19:23:02 C 21 26 58.60 +26 04 13.3 r 170
2006-10-13 19:39:45 C 21 27 05.62 +26 03 45.6 r J94
2006-10-15 13:11:32 C 21 43 03.45 +25 34 16.5 r 379
2006-10-15 13:15:02 C 21 43 04.58 +25 34 13.8 r 379
2006-10-15 13:26:37 C 21 43 08.42 +25 34 04.8 r 379
2006-10-15 13:33:38 C 21 43 10.71 +25 33 58.9 r 379
2006-10-15 13:37:09 C 21 43 11.89 +25 33 56.3 r 379
2006-10-15 13:43:45 C 21 43 14.06 +25 33 50.5 r 379
2006-10-15 13:46:24 C 21 43 14.96 +25 33 48.7 r 379
2006-10-15 17:14:29 C 21 44 32.00 +25 31 00.4 r 113
2006-10-15 17:15:19 C 21 44 32.25 +25 30 59.9 r 113
2006-10-15 17:16:09 C 21 44 32.53 +25 30 59.4 r 113
2006-10-15 17:17:00 C 21 44 32.78 +25 30 58.4 r 113
2006-10-15 17:17:55 C 21 44 33.08 +25 30 58.1 r 113
2006-10-15 17:40:40 C 21 44 40.82 +25 30 44.6 r 240
2006-10-15 17:41:34 C 21 44 41.12 +25 30 44.0 r 240
2006-10-15 17:42:29 C 21 44 41.41 +25 30 43.4 r 240
2006-10-15 17:43:23 C 21 44 41.71 +25 30 42.8 r 240
2006-10-15 17:44:18 C 21 44 42.01 +25 30 42.2 r 240
2006-10-15 17:46:07 C 21 44 42.59 +25 30 41.0 r 240
2006-10-15 17:47:55 C 21 44 43.17 +25 30 39.7 r 240
2006-10-15 17:48:50 C 21 44 43.48 +25 30 39.1 r 240
2006-10-15 17:49:44 C 21 44 43.77 +25 30 38.5 r 240
2006-10-15 19:13:35 C 21 45 10.743 +25 29 43.88 r 143
2006-10-15 19:18:18 C 21 45 12.249 +25 29 40.54 r 143
2006-10-15 20:18:22 C 21 45 31.61 +25 28 50.9 c 127
2006-10-15 20:22:56 C 21 45 33.09 +25 28 47.6 c 127
2006-10-15 20:29:49 C 21 45 35.28 +25 28 42.5 c 127
2006-10-15 20:33:51 C 21 45 36.58 +25 28 39.4 c 127
2006-10-16 10:50:01 C 21 50 15.93 +25 18 46.5 r 379
2006-10-16 10:53:31 C 21 50 16.96 +25 18 44.2 r 379
2006-10-16 10:57:01 C 21 50 17.97 +25 18 41.8 r 379
2006-10-16 11:00:31 C 21 50 19.03 +25 18 39.1 r 379
2006-10-16 11:04:26 C 21 50 20.16 +25 18 36.5 r 379
2006-10-16 11:07:56 C 21 50 21.16 +25 18 33.8 r 379
2006-10-16 11:11:26 C 21 50 22.22 +25 18 31.4 r 379
2006-10-16 11:14:57 C 21 50 23.22 +25 18 29.1 r 379
2006-10-16 11:24:12 C 21 50 25.94 +25 18 21.9 r 379
2006-10-16 11:31:12 C 21 50 27.99 +25 18 17.0 r 379
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)