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
2002-01-08 09:54:28 C 11 15 06.48 +26 59 58.1 19.1 c 704
2002-01-08 10:16:04 C 11 15 07.45 +27 00 04.4 19.2 c 704
2002-01-08 10:37:42 C 11 15 08.35 +27 00 11.0 19.0 c 704
2002-01-08 11:47:40 C 11 15 11.71 +27 00 32.1 c 670
2002-01-08 13:06:48 C 11 15 15.24 +27 00 54.4 c 670
2002-01-12 10:33:40 C 11 19 39.39 +27 31 58.6 c 670
2002-01-12 13:18:25 C 11 19 45.56 +27 33 00.8 c 670
2002-01-13 10:25:43 C 11 20 41.28 +27 41 07.5 c 711
2002-01-13 10:39:33 C 11 20 41.78 +27 41 13.2 c 711
2002-01-13 10:52:48 C 11 20 42.28 +27 41 18.5 c 711
2002-01-13 11:07:03 C 11 20 42.77 +27 41 24.0 c 711
2002-01-18 23:40:50 C 11 25 46.45 +28 41 37.3 c 108
2002-01-18 23:48:07 C 11 25 46.57 +28 41 41.8 c 108
2002-01-18 23:57:12 C 11 25 47.00 +28 41 47.3 c 108
2002-01-19 00:04:54 C 11 25 47.06 +28 41 49.6 c 108
2002-01-22 03:59:36 C 11 28 02.04 +29 24 56.0 c 046
2002-01-22 04:02:24 C 11 28 02.10 +29 24 57.8 c 046
2002-01-22 04:06:16 C 11 28 02.19 +29 25 00.1 c 046
2002-02-02 21:54:19 C 11 31 12.80 +33 18 55.4 151
2002-02-02 21:57:59 C 11 31 12.77 +33 18 59.5 151
2002-02-02 22:00:47 C 11 31 12.67 +33 19 02.6 151
2002-02-02 22:03:56 C 11 31 12.64 +33 19 06.7 151
2002-02-02 22:07:26 C 11 31 12.65 +33 19 10.5 151
2002-02-02 22:08:49 C 11 31 12.54 +33 19 12.4 c 215
2002-02-02 22:09:50 C 11 31 12.57 +33 19 13.3 151
2002-02-02 22:09:52 C 11 31 12.51 +33 19 13.6 c 215
2002-02-02 22:10:35 C 11 31 12.51 +33 19 14.3 c 215
2002-02-02 23:17:17 C 11 31 11.31 +33 20 30.3 c 113
2002-02-02 23:19:28 C 11 31 11.29 +33 20 32.8 c 113
2002-02-02 23:21:40 C 11 31 11.25 +33 20 35.4 c 113
2002-02-02 23:23:53 C 11 31 11.21 +33 20 37.9 c 113
2002-02-02 23:26:05 C 11 31 11.18 +33 20 40.3 c 113
2002-02-03 22:44:34 C 11 30 55.78 +33 47 11.4 c 639
2002-02-03 22:54:36 C 11 30 55.63 +33 47 23.7 c 639
2002-02-03 23:04:35 C 11 30 55.37 +33 47 34.9 c 639
2002-02-03 23:24:33 C 11 30 54.96 +33 47 59.3 c 639
2002-02-03 23:35:06 C 11 30 54.73 +33 48 11.9 c 639
2002-02-04 21:11:45 C 11 30 35.03 +34 14 00.3 c 113
2002-02-04 21:13:45 C 11 30 35.03 +34 14 02.9 c 113
2002-02-04 21:15:46 C 11 30 34.96 +34 14 05.6 c 113
2002-02-04 21:17:46 C 11 30 34.92 +34 14 08.1 c 113
2002-02-04 21:19:46 C 11 30 34.88 +34 14 10.7 c 113
2002-02-06 14:34:48 C 11 29 38.12 +35 07 46.1 379
2002-02-06 14:38:51 C 11 29 37.98 +35 07 51.5 379
2002-02-06 14:43:59 C 11 29 37.88 +35 08 00.1 379
2002-02-06 14:48:08 C 11 29 37.68 +35 08 05.1 379
2002-02-06 14:54:30 C 11 29 37.37 +35 08 14.5 379
2002-02-06 15:03:52 C 11 29 37.09 +35 08 27.0 379
2002-02-07 14:29:28 C 11 28 53.78 +35 41 09.9 379
2002-02-07 14:31:47 C 11 28 53.69 +35 41 13.2 379
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)