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
2021-02-11 15:40:28 C 16 05 52.52 -16 44 23.3 V T08
2021-02-11 15:50:27 C 16 05 55.73 -16 44 41.0 V T08
2021-02-11 15:57:06 C 16 05 57.72 -16 44 52.8 V T08
2021-02-17 15:15:56 C 16 54 04.175 -20 50 55.94 U F51
2021-02-17 15:16:53 C 16 54 04.500 -20 50 57.43 U F51
2021-02-17 15:23:27 C 16 54 06.756 -20 51 07.83 U F51
2021-02-17 15:24:23 C 16 54 07.082 -20 51 09.41 U F51
2021-02-17 15:30:55 C 16 54 09.338 -20 51 19.80 U F51
2021-02-17 15:31:51 C 16 54 09.654 -20 51 21.24 U F51
2021-02-17 15:39:19 C 16 54 12.219 -20 51 33.12 U F51
2021-10-25 11:26:38 C 09 00 13.76 +27 25 22.1 V G96
2021-10-25 11:53:08 C 09 00 16.32 +27 25 17.2 V G96
2021-10-25 11:59:54 C 09 00 17.00 +27 25 16.0 V G96
2021-10-25 12:06:39 C 09 00 17.67 +27 25 14.8 V G96
2021-11-18 10:03:13 C 09 55 09.54 +25 27 42.8 V G96
2021-11-18 10:10:02 C 09 55 10.15 +25 27 41.9 V G96
2021-11-18 10:16:53 C 09 55 10.78 +25 27 40.6 V G96
2021-11-18 10:23:43 C 09 55 11.36 +25 27 39.3 V G96
2021-12-01 11:40:28 C 10 23 03.74 +24 26 06.5 V 703
2021-12-01 11:48:00 C 10 23 04.38 +24 26 05.7 V 703
2021-12-01 11:55:31 C 10 23 04.98 +24 26 04.7 V 703
2021-12-01 12:03:03 C 10 23 05.69 +24 26 02.3 V 703
2021-12-04 11:38:55 C 10 29 15.52 +24 13 11.5 V G96
2021-12-04 11:47:13 C 10 29 16.21 +24 13 10.2 V G96
2021-12-04 11:55:30 C 10 29 16.89 +24 13 09.0 V G96
2021-12-04 12:03:47 C 10 29 17.58 +24 13 07.3 V G96
2021-12-13 09:12:01 C 10 47 10.63 +23 38 53.9 V 703
2021-12-13 09:19:36 C 10 47 11.16 +23 38 52.4 V 703
2021-12-13 09:27:11 C 10 47 11.82 +23 38 52.7 V 703
2021-12-13 09:34:46 C 10 47 12.45 +23 38 50.9 V 703
2021-12-29 23:56:30 C 11 18 55.41 +22 56 43.4 X C95
2021-12-30 00:03:30 C 11 18 55.88 +22 56 43.8 X C95
2022-01-04 11:48:47 C 11 28 56.77 +22 51 28.1 V 703
2022-01-04 11:56:21 C 11 28 57.31 +22 51 27.4 V 703
2022-01-04 12:03:54 C 11 28 57.84 +22 51 27.8 V 703
2022-01-04 12:11:28 C 11 28 58.40 +22 51 28.2 V 703
2022-01-05 10:40:07 C 11 30 40.22 +22 51 02.8 V G96
2022-01-05 10:47:38 C 11 30 40.75 +22 51 02.8 V G96
2022-01-05 10:55:08 C 11 30 41.27 +22 51 02.7 V G96
2022-01-05 11:02:38 C 11 30 41.80 +22 51 02.7 V G96
2022-01-08 09:37:57 C 11 35 58.74 +22 50 46.6 V 703
2022-01-08 09:45:29 C 11 35 59.27 +22 50 46.9 V 703
2022-01-08 09:53:02 C 11 35 59.83 +22 50 46.6 V 703
2022-01-08 10:00:35 C 11 36 00.36 +22 50 46.9 V 703
2022-01-08 12:57:32 C 11 36 13.62 +22 50 52.2 V T05
2022-01-08 13:02:09 C 11 36 13.92 +22 50 52.4 V T05
2022-01-08 13:44:18 C 11 36 16.80 +22 50 53.1 V T05
2022-01-08 13:50:19 C 11 36 17.22 +22 50 53.3 V T05
2022-01-10 12:18:54 C 11 39 44.87 +22 51 37.0 V T08
2022-01-10 12:33:15 C 11 39 45.86 +22 51 38.1 V T08
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)