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
2022-02-10 11:15:56 C 12 42 36.40 +25 07 28.5 V T08
2022-02-10 11:20:35 C 12 42 36.93 +25 07 30.7 V T08
2022-02-10 11:30:37 C 12 42 38.05 +25 07 35.2 V T08
2022-02-10 20:39:34 C 12 43 48.75 +25 10 53.5 V B18
2022-02-10 20:40:55 C 12 43 48.88 +25 10 54.6 q B18
2022-02-10 20:44:51 C 12 43 49.41 +25 10 56.1 V B18
2022-02-10 20:46:11 C 12 43 49.57 +25 10 57.1 q B18
2022-02-10 20:50:53 C 12 43 50.15 +25 10 58.8 V B18
2022-02-10 20:52:14 C 12 43 50.27 +25 11 00.0 q B18
2022-02-10 20:56:15 C 12 43 50.80 +25 11 01.5 V B18
2022-02-10 20:57:34 C 12 43 50.95 +25 11 02.3 q B18
2022-02-10 21:01:31 C 12 43 51.44 +25 11 04.1 V B18
2022-02-10 21:02:51 C 12 43 51.59 +25 11 04.7 q B18
2022-02-10 21:06:47 C 12 43 52.08 +25 11 06.6 V B18
2022-02-10 21:08:08 C 12 43 52.21 +25 11 07.2 q B18
2022-02-10 22:28:38 C 12 44 02.84 +25 11 28.8 V Z80
2022-02-10 22:32:07 C 12 44 03.25 +25 11 30.8 V Z80
2022-02-10 22:35:36 C 12 44 03.69 +25 11 31.8 V Z80
2022-02-11 10:46:07 C 12 45 37.85 +25 17 10.1 V 703
2022-02-11 10:53:40 C 12 45 38.75 +25 17 13.3 V 703
2022-02-11 11:01:12 C 12 45 39.64 +25 17 16.5 V 703
2022-02-11 11:08:44 C 12 45 40.54 +25 17 19.8 V 703
2022-02-11 12:32:24 C 12 45 53.52 +25 18 06.6 V T05
2022-02-11 12:41:07 C 12 45 54.54 +25 18 10.6 V T05
2022-02-11 12:45:54 C 12 45 55.12 +25 18 12.8 V T05
2022-02-11 12:59:55 C 12 45 56.77 +25 18 19.2 V T05
2022-02-11 20:13:43 C 12 46 58.22 +25 20 52.8 V C40
2022-02-11 20:16:48 C 12 46 58.62 +25 20 54.2 V C40
2022-02-11 20:19:52 C 12 46 59.03 +25 20 55.7 V C40
2022-02-11 20:21:26 C 12 46 59.24 +25 20 56.6 V C40
2022-02-11 20:22:57 C 12 46 59.44 +25 20 57.5 V C40
2022-02-11 20:24:31 C 12 46 59.64 +25 20 58.2 V C40
2022-02-11 20:26:02 C 12 46 59.85 +25 20 58.9 V C40
2022-02-11 20:29:07 C 12 47 00.26 +25 21 00.5 V C40
2022-02-11 20:33:44 C 12 47 00.86 +25 21 02.9 V C40
2022-02-11 20:35:18 C 12 47 01.07 +25 21 03.7 V C40
2022-02-11 20:35:39 C 12 47 01.09 +25 21 06.8 q B18
2022-02-11 20:36:48 C 12 47 01.26 +25 21 06.5 V B18
2022-02-11 20:38:22 C 12 47 01.48 +25 21 05.2 V C40
2022-02-11 20:39:54 C 12 47 01.67 +25 21 05.9 V C40
2022-02-11 20:40:16 C 12 47 01.69 +25 21 08.5 q B18
2022-02-11 20:41:24 C 12 47 01.86 +25 21 09.0 V B18
2022-02-11 20:44:51 C 12 47 02.36 +25 21 11.7 q B18
2022-02-11 20:46:01 C 12 47 02.45 +25 21 11.2 V B18
2022-02-11 20:49:28 C 12 47 02.85 +25 21 13.4 q B18
2022-02-11 20:50:36 C 12 47 03.07 +25 21 14.0 V B18
2022-02-11 20:50:36 C 12 47 03.08 +25 21 11.5 V C40
2022-02-11 20:52:09 C 12 47 03.28 +25 21 12.3 V C40
2022-02-11 20:54:04 C 12 47 03.50 +25 21 15.2 q B18
2022-02-11 20:55:13 C 12 47 03.64 +25 21 15.7 V B18
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)