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
2005-11-26 05:04:18 C 02 07 48.52 +41 15 58.4 18.2 c 704
2005-11-26 05:22:54 C 02 07 46.53 +41 15 38.9 17.8 c 704
2005-11-26 05:41:51 C 02 07 44.55 +41 15 19.4 17.9 c 704
2005-11-26 06:00:47 C 02 07 42.61 +41 14 59.1 18.2 c 704
2005-12-01 19:16:12 C 01 57 13.16 +38 59 53.8 r 113
2005-12-01 19:20:58 C 01 57 12.81 +38 59 49.1 r 113
2005-12-01 19:22:33 C 01 57 12.72 +38 59 47.8 r 113
2005-12-01 19:24:08 C 01 57 12.66 +38 59 46.0 r 113
2005-12-01 19:25:43 C 01 57 12.55 +38 59 45.0 r 113
2005-12-01 19:27:17 C 01 57 12.47 +38 59 43.3 r 113
2005-12-02 07:54:33 C 01 56 25.51 +38 47 34.0 r 703
2005-12-02 08:06:55 C 01 56 24.79 +38 47 21.8 r 703
2005-12-02 08:19:05 C 01 56 24.00 +38 47 09.6 r 703
2005-12-02 08:30:53 C 01 56 23.24 +38 46 57.6 r 703
2005-12-08 05:55:12 C 01 50 16.87 +36 37 19.9 r 703
2005-12-08 06:07:42 C 01 50 16.44 +36 37 08.2 r 703
2005-12-08 06:20:12 C 01 50 16.08 +36 36 57.3 r 703
2005-12-08 06:32:44 C 01 50 15.64 +36 36 46.8 r 703
2005-12-10 17:59:36 C 01 48 54.32 +35 47 25.1 r J87
2005-12-10 18:07:37 C 01 48 54.14 +35 47 19.0 r J87
2005-12-10 18:15:38 C 01 48 53.97 +35 47 13.0 r J87
2005-12-24 03:22:44 C 01 50 30.59 +32 17 47.4 18.8 c 704
2005-12-24 03:41:22 C 01 50 31.00 +32 17 36.6 19.6 c 704
2005-12-24 04:18:58 C 01 50 31.70 +32 17 19.2 19.7 c 704
2005-12-24 04:37:34 C 01 50 32.10 +32 17 08.1 19.8 c 704
2006-10-01 02:59:30 C 16 24 59.54 +14 05 08.8 r 703
2006-10-01 03:02:37 C 16 25 03.46 +14 05 33.9 r 703
2006-10-01 03:05:42 C 16 25 07.42 +14 05 58.2 r 703
2006-10-04 17:58:59 C 18 25 29.38 +23 38 58.5 o 198
2006-10-04 17:59:34 C 18 25 30.16 +23 39 01.1 o 198
2006-10-04 18:00:46 C 18 25 31.74 +23 39 06.1 o 198
2006-10-04 18:01:21 C 18 25 32.50 +23 39 08.7 o 198
2006-10-04 18:01:33 C 18 25 32.76 +23 39 09.5 o 198
2006-10-05 19:05:27 C 18 58 01.434 +25 09 49.17 r 143
2006-10-05 19:07:47 C 18 58 04.236 +25 09 55.72 r 143
2006-10-05 19:09:57 C 18 58 06.849 +25 10 01.76 r 143
2006-10-05 19:12:08 C 18 58 09.483 +25 10 08.02 r 143
2006-10-05 19:31:53 C 18 58 33.264 +25 11 03.51 r 143
2006-10-05 19:36:17 C 18 58 38.561 +25 11 15.67 r 143
2006-10-05 19:38:28 C 18 58 41.207 +25 11 21.87 r 143
2006-10-05 19:40:40 C 18 58 43.845 +25 11 27.82 r 143
2006-10-05 19:45:02 C 18 58 49.112 +25 11 39.91 r 143
2006-10-05 19:51:35 C 18 58 57.010 +25 11 58.03 r 143
2006-10-05 19:58:09 C 18 59 04.931 +25 12 15.98 r 143
2006-10-05 20:38:25 C 18 59 53.57 +25 14 06.3 r 204
2006-10-05 20:39:55 C 18 59 55.37 +25 14 10.3 r 204
2006-10-05 20:41:26 C 18 59 57.18 +25 14 14.4 r 204
2006-10-05 20:42:40 C 18 59 58.69 +25 14 17.6 r 204
2006-10-05 20:44:26 C 19 00 00.81 +25 14 22.3 r 204
2006-10-07 18:05:50 C 19 50 24.833 +26 36 30.88 r 143
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)