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
2024-11-12 09:15:29 C 06 39 35.053 +45 01 01.24 V 703
2024-11-12 09:19:24 C 06 39 34.751 +45 01 04.33 V 703
2024-11-14 06:26:01 C 06 35 56.713 +45 35 30.66 V 703
2024-11-14 06:29:25 C 06 35 56.404 +45 35 32.53 V 703
2024-11-14 06:32:48 C 06 35 56.191 +45 35 35.16 V 703
2024-11-14 06:36:12 C 06 35 55.936 +45 35 38.83 V 703
2024-11-15 05:36:26 C 06 33 52.931 +45 53 00.67 V 703
2024-11-15 05:39:44 C 06 33 52.456 +45 53 01.25 V 703
2024-11-15 05:43:02 C 06 33 52.117 +45 53 03.41 V 703
2024-11-15 05:46:20 C 06 33 51.703 +45 53 06.72 V 703
2024-11-16 11:17:12 C 06 31 01.369 +46 15 14.69 X F51
2024-11-16 11:34:03 C 06 30 59.573 +46 15 27.47 X F51
2024-11-16 11:52:09 C 06 30 57.664 +46 15 41.27 X F51
2024-11-21 11:34:25 C 06 17 08.479 +47 39 06.98 V T05
2024-11-21 11:38:21 C 06 17 08.016 +47 39 09.68 V T05
2024-11-21 12:26:40 C 06 17 01.231 +47 39 41.94 V T05
2024-11-21 13:06:10 C 06 16 55.718 +47 40 06.71 V T05
2024-11-23 09:53:27 C 06 10 47.068 +48 07 44.08 V 703
2024-11-23 09:57:40 C 06 10 46.434 +48 07 46.42 V 703
2024-11-23 10:01:56 C 06 10 45.779 +48 07 48.18 V 703
2024-11-23 10:06:05 C 06 10 45.224 +48 07 51.06 V 703
2024-11-25 12:22:21 C 06 03 15.878 +48 35 50.39 V T05
2024-11-25 13:13:29 C 06 03 07.514 +48 36 16.31 V T05
2024-11-25 13:54:28 C 06 03 00.838 +48 36 36.65 V T05
2024-11-25 14:30:36 C 06 02 54.936 +48 36 54.04 V T05
2024-11-27 12:11:57 C 05 55 35.366 +48 58 45.04 X F52
2024-11-27 12:27:48 C 05 55 32.605 +48 58 51.86 X F52
2024-11-27 12:43:38 C 05 55 29.848 +48 58 58.59 X F52
2024-11-27 12:59:29 C 05 55 27.088 +48 59 05.24 X F52
2024-11-28 23:39:37 B 05 49 35.92 +49 12 58.3 X K19
2024-11-28 23:44:45 B 05 49 34.97 +49 13 00.0 X K19
2024-11-28 23:49:55 B 05 49 34.05 +49 13 02.0 X K19
2024-11-29 07:15:18 C 05 48 17.021 +49 15 47.16 V 703
2024-11-29 07:18:43 C 05 48 16.416 +49 15 48.49 V 703
2024-11-29 07:22:08 C 05 48 15.700 +49 15 49.61 V 703
2024-11-29 07:25:33 C 05 48 15.167 +49 15 50.90 V 703
2024-11-29 12:04:09 C 05 47 25.747 +49 17 33.25 V T05
2024-11-29 12:12:07 C 05 47 24.269 +49 17 35.63 V T05
2024-11-29 12:16:44 C 05 47 23.419 +49 17 37.86 V T05
2024-11-29 13:04:13 C 05 47 14.736 +49 17 52.98 V T05
2024-12-02 07:19:06 C 05 35 18.99 +49 35 52.6 V U55
2024-12-02 07:32:00 C 05 35 16.40 +49 35 55.6 V U55
2024-12-02 07:44:55 C 05 35 13.96 +49 35 58.3 V U55
2024-12-05 09:46:12 C 05 21 16.106 +49 44 34.98 V T08
2024-12-05 09:50:25 C 05 21 15.271 +49 44 35.23 V T08
2024-12-05 09:59:09 C 05 21 13.522 +49 44 35.20 V T08
2024-12-07 06:44:53 C 05 12 39.084 +49 43 10.60 V T05
2024-12-07 06:48:10 C 05 12 38.460 +49 43 10.81 V T05
2024-12-07 06:50:08 C 05 12 38.057 +49 43 10.78 V T05
2024-12-07 06:53:24 C 05 12 37.430 +49 43 10.42 V T05
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)