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
2002-02-18 13:55:47 C 11 04 20.95 +44 54 13.8 379
2002-02-18 14:27:56 C 11 04 14.01 +44 55 54.7 379
2002-02-18 14:32:49 C 11 04 12.96 +44 56 09.7 379
2002-02-19 07:36:19 C 11 00 43.44 +45 49 45.6 15.5 c 704
2002-02-19 07:57:41 C 11 00 38.30 +45 50 54.7 16.0 c 704
2002-02-19 08:39:09 C 11 00 27.96 +45 53 09.5 15.5 c 704
2002-02-19 08:59:51 C 11 00 22.83 +45 54 15.2 16.4 c 704
2002-02-19 13:47:20 C 10 59 24.41 +46 09 48.1 379
2002-02-19 13:48:38 C 10 59 24.07 +46 09 51.8 379
2002-02-19 14:19:32 C 10 59 16.33 +46 11 37.3 379
2002-02-19 14:21:27 C 10 59 15.83 +46 11 43.7 379
2002-02-19 21:48:21 C 10 57 33.43 +46 36 17.4 c 560
2002-02-19 21:54:29 C 10 57 31.84 +46 36 38.6 c 560
2002-02-19 21:58:53 C 10 57 30.71 +46 36 54.2 c 560
2002-02-19 22:00:02 C 10 57 30.392 +46 36 58.04 a 112
2002-02-19 22:02:34 C 10 57 29.663 +46 37 07.24 a 112
2002-02-19 22:06:11 C 10 57 28.869 +46 37 19.17 a 112
2002-02-19 22:10:19 C 10 57 27.725 +46 37 34.32 a 112
2002-02-19 22:17:19 C 10 57 25.876 +46 37 58.60 a 112
2002-02-19 22:22:23 C 10 57 24.600 +46 38 15.76 a 112
2002-02-19 22:27:12 C 10 57 23.372 +46 38 33.34 a 112
2002-02-20 12:15:01 C 10 53 59.29 +47 26 31.4 379
2002-02-20 12:16:42 C 10 53 58.74 +47 26 37.4 379
2002-02-20 12:21:31 C 10 53 57.34 +47 26 55.3 379
2002-02-20 12:23:55 C 10 53 56.68 +47 27 04.4 379
2002-02-20 13:05:23 C 10 53 44.84 +47 29 39.7 379
2002-02-20 13:07:20 C 10 53 44.26 +47 29 46.7 379
2002-02-20 19:05:56 C 10 52 06.65 +47 50 36.7 c 084
2002-02-21 21:41:02 C 10 43 59.93 +49 32 25.6 c 198
2002-02-21 21:47:24 C 10 43 57.65 +49 32 51.6 c 198
2002-02-21 21:51:51 C 10 43 53.44 +49 32 58.1 c 084
2002-02-21 21:55:20 C 10 43 54.78 +49 33 24.1 c 198
2002-02-21 22:00:38 C 10 43 52.87 +49 33 46.0 c 198
2002-02-21 22:07:01 C 10 43 50.57 +49 34 12.4 c 198
2002-02-21 22:31:08 C 10 43 41.61 +49 35 57.6 c 560
2002-02-21 22:32:38 C 10 43 41.10 +49 36 03.3 c 560
2002-02-21 22:33:49 C 10 43 40.63 +49 36 08.2 c 560
2002-02-21 22:35:02 C 10 43 40.20 +49 36 13.2 c 560
2002-02-22 01:33:03 C 10 42 33.05 +49 47 35.8 c 084
2002-02-22 06:13:26 C 10 40 58.33 +50 07 17.6 c 750
2002-02-22 06:15:36 C 10 40 57.47 +50 07 25.5 c 750
2002-02-22 06:19:01 C 10 40 56.10 +50 07 39.0 c 750
2002-02-22 06:28:32 C 10 40 52.41 +50 08 19.4 c 750
2002-02-22 06:36:28 C 10 40 49.30 +50 08 52.4 c 750
2002-02-22 15:32:17 C 10 37 27.78 +50 46 25.9 c 355
2002-02-22 15:34:25 C 10 37 26.84 +50 46 35.0 c 355
2002-02-22 15:36:17 C 10 37 26.07 +50 46 42.7 c 355
2002-02-22 15:38:19 C 10 37 25.18 +50 46 51.3 c 355
2002-02-23 07:31:57 C 10 30 50.30 +51 56 08.2 16.2 c 704
2002-02-23 07:53:19 C 10 30 39.93 +51 57 43.6 16.3 c 704
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)