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
2006-10-25 17:23:46 C 22 37 36.02 +23 04 26.0 r 113
2006-10-25 17:24:24 C 22 37 35.68 +23 04 27.1 r 113
2006-10-25 17:24:36 C 22 37 36.15 +23 04 25.6 r 113
2006-10-25 17:25:26 C 22 37 36.26 +23 04 25.1 r 113
2006-10-25 19:10:35 C 22 37 50.75 +23 03 36.3 o 639
2006-10-25 19:15:35 C 22 37 51.44 +23 03 33.9 o 639
2006-10-25 19:21:12 C 22 37 52.22 +23 03 31.3 o 639
2006-10-25 19:32:15 C 22 37 53.73 +23 03 25.8 o 639
2006-10-25 19:40:15 C 22 37 54.83 +23 03 22.0 o 639
2006-10-25 19:52:09 C 22 37 56.46 +23 03 16.2 o 639
2006-10-25 19:57:10 C 22 37 57.15 +23 03 14.1 o 639
2006-10-27 03:21:36 C 22 42 25.38 +22 48 55.1 r 703
2006-10-27 03:31:52 C 22 42 26.67 +22 48 50.6 r 703
2006-10-27 03:42:08 C 22 42 27.86 +22 48 45.9 r 703
2006-10-27 12:11:53 C 22 43 36.35 +22 44 57.4 r 379
2006-10-27 12:17:03 C 22 43 37.00 +22 44 54.6 r 379
2006-10-27 12:51:02 C 22 43 41.15 +22 44 39.3 r 379
2006-10-27 12:56:13 C 22 43 41.78 +22 44 36.7 r 379
2006-10-29 02:15:13 C 22 48 32.72 +22 28 44.9 r H51
2006-10-29 02:17:30 C 22 48 32.98 +22 28 43.9 r H51
2006-10-29 02:19:46 C 22 48 33.24 +22 28 43.2 r H51
2006-10-29 02:22:03 C 22 48 33.51 +22 28 42.3 r H51
2006-10-29 02:24:20 C 22 48 33.75 +22 28 41.3 r H51
2006-10-29 02:26:38 C 22 48 34.00 +22 28 40.3 r H51
2006-10-29 02:28:54 C 22 48 34.27 +22 28 39.4 r H51
2006-10-29 02:31:12 C 22 48 34.52 +22 28 38.4 r H51
2006-10-29 11:54:29 C 22 49 43.80 +22 24 57.9 r 379
2006-10-29 12:10:11 C 22 49 45.50 +22 24 51.5 r 379
2006-10-29 13:50:11 C 22 49 56.84 +22 24 10.0 300
2006-10-29 14:24:23 C 22 50 00.73 +22 23 55.1 300
2006-10-29 14:35:00 C 22 50 01.94 +22 23 50.0 300
2006-10-29 14:38:43 C 22 50 02.35 +22 23 48.7 300
2006-10-29 14:42:17 C 22 50 02.77 +22 23 47.1 300
2006-10-30 18:02:19 C 22 53 20.87 +22 13 11.5 o 151
2006-10-30 18:03:25 C 22 53 20.99 +22 13 11.2 o 151
2006-10-30 18:04:31 C 22 53 21.12 +22 13 10.9 o 151
2006-10-30 18:05:37 C 22 53 21.23 +22 13 10.4 o 151
2006-10-30 18:06:43 C 22 53 21.36 +22 13 10.0 o 151
2006-10-30 18:07:49 C 22 53 21.47 +22 13 09.7 o 151
2006-10-30 18:08:54 C 22 53 21.59 +22 13 09.4 o 151
2006-11-04 19:15:37 C 23 06 15.83 +21 33 23.5 d 143
2006-11-04 19:25:26 C 23 06 16.73 +21 33 20.7 d 143
2006-11-04 19:34:40 C 23 06 17.57 +21 33 18.1 d 143
2006-11-08 17:05:13 C 23 15 06.86 +21 08 56.3 r 113
2006-11-08 17:06:53 C 23 15 07.01 +21 08 56.0 r 113
2006-11-08 17:08:34 C 23 15 07.15 +21 08 55.5 r 113
2006-11-08 17:10:16 C 23 15 07.31 +21 08 55.3 r 113
2006-11-08 17:11:57 C 23 15 07.45 +21 08 54.9 r 113
2006-11-09 18:44:26 C 23 17 24.20 +21 03 09.1 r 240
2006-11-09 18:56:32 C 23 17 25.19 +21 03 06.2 r 240
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)