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
2024-12-07 06:54:42 C 05 12 37.190 +49 43 10.34 V T05
2024-12-07 07:44:23 C 05 12 27.314 +49 43 08.36 V T05
2024-12-07 08:25:14 C 05 12 19.166 +49 43 06.71 V T05
2024-12-09 05:25:06 C 05 03 40.921 +49 36 40.57 V G96
2024-12-09 05:33:04 C 05 03 39.352 +49 36 38.81 V G96
2024-12-09 05:48:58 C 05 03 36.176 +49 36 36.54 V G96
2024-12-09 10:43:44 C 05 02 38.976 +49 35 41.93 V T08
2024-12-09 10:49:01 C 05 02 37.908 +49 35 40.88 V T08
2024-12-09 10:56:59 C 05 02 36.269 +49 35 39.30 V T08
2024-12-09 11:41:19 C 05 02 27.502 +49 35 29.04 V T08
2024-12-17 11:05:21 C 04 28 03.799 +48 14 56.44 V T05
2024-12-17 11:09:57 C 04 28 03.029 +48 14 52.66 V T05
2024-12-17 11:19:15 C 04 28 01.416 +48 14 46.79 V T05
2024-12-17 12:10:31 C 04 27 52.709 +48 14 13.38 V T05
2024-12-18 06:37:11 C 04 24 55.008 +48 02 43.51 V G96
2024-12-18 06:45:01 C 04 24 53.694 +48 02 38.54 V G96
2024-12-18 06:52:50 C 04 24 52.391 +48 02 33.40 V G96
2024-12-18 07:00:37 C 04 24 51.095 +48 02 28.28 V G96
2024-12-19 09:16:50 C 04 20 44.484 +47 45 13.68 V T05
2024-12-19 09:21:31 C 04 20 43.735 +47 45 10.58 V T05
2024-12-19 09:30:08 C 04 20 42.350 +47 45 04.90 V T05
2024-12-19 09:44:38 C 04 20 39.991 +47 44 54.64 V T05
2024-12-27 08:53:08 C 03 55 49.493 +45 15 47.81 V T05
2024-12-27 08:57:45 C 03 55 48.984 +45 15 44.21 V T05
2024-12-27 09:07:01 C 03 55 47.938 +45 15 35.96 V T05
2024-12-27 09:22:47 C 03 55 46.186 +45 15 22.50 V T05
2024-12-29 08:36:12 C 03 51 04.922 +44 34 56.24 V T08
2024-12-29 08:39:00 C 03 51 04.680 +44 34 53.69 V T08
2024-12-29 08:40:19 C 03 51 04.531 +44 34 52.10 V T08
2024-12-29 08:49:38 C 03 51 03.600 +44 34 44.08 V T08
2024-12-29 09:06:15 C 03 51 01.944 +44 34 29.75 V T08
2024-12-29 09:12:12 C 03 51 01.370 +44 34 24.64 V T08
2025-01-02 08:19:17 C 03 43 17.570 +43 12 08.71 V T08
2025-01-02 08:26:40 C 03 43 16.932 +43 12 02.38 V T08
2025-01-02 08:32:38 C 03 43 16.567 +43 11 56.62 V T08
2025-01-02 08:40:36 C 03 43 15.950 +43 11 49.38 V T05
2025-01-02 08:45:11 C 03 43 15.622 +43 11 45.85 V T05
2025-01-02 08:49:13 C 03 43 15.290 +43 11 42.68 V T08
2025-01-02 08:53:16 C 03 43 14.993 +43 11 38.00 V T05
2025-01-02 09:26:53 C 03 43 12.509 +43 11 08.34 V T05
2025-01-05 07:06:29 C 03 38 55.662 +42 11 38.69 V G96
2025-01-05 07:14:09 C 03 38 55.212 +42 11 31.92 V G96
2025-01-05 07:21:49 C 03 38 54.769 +42 11 25.19 V G96
2025-01-05 07:29:27 C 03 38 54.344 +42 11 18.64 V G96
2025-01-06 09:13:19 C 03 37 36.408 +41 49 51.38 V T08
2025-01-06 09:18:03 C 03 37 36.053 +41 49 47.50 V T08
2025-01-06 09:55:51 C 03 37 34.058 +41 49 14.81 V T08
2025-01-06 10:11:19 C 03 37 33.274 +41 49 02.24 V T08
2025-01-07 07:39:29 C 03 36 35.537 +41 31 19.74 V T05
2025-01-07 07:44:03 C 03 36 35.386 +41 31 16.93 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)