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
2006-10-10 10:24:57 C 20 43 14.50 +26 50 13.5 r 379
2006-10-10 17:55:00 C 20 48 13.58 +26 47 11.7 o 151
2006-10-10 17:55:31 C 20 48 13.89 +26 47 11.5 o 151
2006-10-10 17:56:01 C 20 48 14.21 +26 47 11.4 o 151
2006-10-10 17:57:02 C 20 48 14.84 +26 47 10.9 o 151
2006-10-10 17:57:33 C 20 48 15.16 +26 47 10.7 o 151
2006-10-10 17:58:04 C 20 48 15.48 +26 47 10.7 o 151
2006-10-10 18:56:21 C 20 48 51.02 +26 46 46.8 c 046
2006-10-10 19:05:14 C 20 48 56.50 +26 46 43.2 c 046
2006-10-10 19:06:14 C 20 48 57.10 +26 46 42.8 c 046
2006-10-10 19:08:29 C 20 48 58.49 +26 46 41.8 c 046
2006-10-10 19:13:51 C 20 49 02.12 +26 46 46.3 c A53
2006-10-10 19:16:38 C 20 49 03.83 +26 46 45.4 c A53
2006-10-10 19:19:43 C 20 49 05.72 +26 46 44.0 c A53
2006-10-10 19:22:46 C 20 49 07.57 +26 46 42.6 c A53
2006-10-10 19:31:59 C 20 49 13.31 +26 46 39.0 c A48
2006-10-10 19:34:33 C 20 49 14.89 +26 46 37.7 c A48
2006-10-10 19:37:09 C 20 49 16.47 +26 46 36.7 c A48
2006-10-10 19:39:44 C 20 49 18.05 +26 46 35.6 c A48
2006-10-11 17:40:57 C 21 02 33.74 +26 35 53.3 r 113
2006-10-11 17:44:25 C 21 02 35.62 +26 35 51.5 r 113
2006-10-11 17:47:06 C 21 02 37.07 +26 35 50.1 r 113
2006-10-11 19:22:13 C 21 03 27.78 +26 35 02.5 r A97
2006-10-11 19:26:03 C 21 03 29.82 +26 35 00.2 r A97
2006-10-11 19:29:04 C 21 03 31.46 +26 34 57.8 14.9 r A97
2006-10-11 19:34:26 C 21 03 34.29 +26 34 55.1 r A97
2006-10-11 19:37:27 C 21 03 35.91 +26 34 53.9 r A97
2006-10-11 19:57:32 C 21 03 46.61 +26 34 41.3 r A97
2006-10-11 20:00:39 C 21 03 48.42 +26 34 39.3 r A97
2006-10-12 10:47:28 C 21 11 42.42 +26 26 16.9 r 379
2006-10-12 10:52:51 C 21 11 45.01 +26 26 13.7 r 379
2006-10-12 10:59:00 C 21 11 48.02 +26 26 09.7 r 379
2006-10-12 11:04:20 C 21 11 50.61 +26 26 06.6 r 379
2006-10-12 11:11:55 C 21 11 54.25 +26 26 01.4 r 379
2006-10-12 11:14:34 C 21 11 55.55 +26 25 59.6 r 379
2006-10-12 11:17:14 C 21 11 56.81 +26 25 57.7 r 379
2006-10-12 11:19:54 C 21 11 58.12 +26 25 55.8 r 379
2006-10-12 11:25:48 C 21 12 00.96 +26 25 52.0 r 379
2006-10-12 11:28:28 C 21 12 02.23 +26 25 50.2 r 379
2006-10-12 17:36:16 C 21 15 09.77 +26 21 29.8 o 198
2006-10-12 17:37:06 C 21 15 10.17 +26 21 29.3 o 198
2006-10-12 17:39:04 C 21 15 11.10 +26 21 28.2 o 198
2006-10-12 17:39:54 C 21 15 11.50 +26 21 27.5 o 198
2006-10-12 17:40:12 C 21 15 11.63 +26 21 27.4 o 198
2006-10-12 17:42:35 C 21 15 12.81 +26 21 27.8 o 151
2006-10-12 17:43:20 C 21 15 13.15 +26 21 27.3 o 151
2006-10-12 17:44:04 C 21 15 13.50 +26 21 26.9 o 151
2006-10-12 17:44:45 C 21 15 13.82 +26 21 26.5 o 151
2006-10-12 17:45:28 C 21 15 14.16 +26 21 26.1 o 151
2006-10-12 17:46:09 C 21 15 14.48 +26 21 25.7 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)