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
2023-10-22 10:33:44 C 07 40 45.041 +34 34 33.89 V G96
2023-10-22 10:41:13 C 07 40 45.498 +34 34 36.16 V G96
2023-10-30 12:11:52 C 07 52 31.829 +35 37 20.36 X F51
2023-10-30 12:23:05 C 07 52 32.425 +35 37 24.56 X F51
2023-10-30 12:34:15 C 07 52 32.996 +35 37 28.78 X F51
2023-10-30 12:45:24 C 07 52 33.580 +35 37 33.16 X F51
2023-11-13 13:35:26 C 08 06 13.619 +38 02 08.33 X F52
2023-11-13 13:51:22 C 08 06 13.932 +38 02 16.72 X F52
2023-11-13 14:07:18 C 08 06 14.254 +38 02 25.13 X F52
2023-11-13 14:23:13 C 08 06 14.550 +38 02 33.40 X F52
2023-11-15 09:00:31 C 08 07 10.607 +38 24 52.96 V 703
2023-11-15 09:07:58 C 08 07 10.621 +38 24 56.74 V 703
2023-11-15 09:15:24 C 08 07 10.632 +38 25 01.31 V 703
2023-11-15 09:22:50 C 08 07 10.823 +38 25 06.24 V 703
2023-11-22 09:05:03 C 08 08 33.212 +40 03 23.62 V 703
2023-11-22 09:20:26 C 08 08 33.194 +40 03 32.90 V 703
2023-11-22 09:28:08 C 08 08 33.086 +40 03 39.02 V 703
2023-11-24 11:28:33 C 08 08 10.706 +40 36 07.03 X F52
2023-11-24 11:39:49 C 08 08 10.529 +40 36 14.88 X F52
2023-11-24 11:51:06 C 08 08 10.346 +40 36 22.65 X F52
2023-11-24 12:02:25 C 08 08 10.162 +40 36 30.42 X F52
2023-11-25 14:21:11 C 08 07 47.637 +40 54 10.74 X F51
2023-11-25 14:36:40 C 08 07 47.296 +40 54 21.23 X F51
2023-11-25 14:49:41 C 08 07 47.010 +40 54 29.99 X F51
2023-11-25 15:03:28 C 08 07 46.710 +40 54 39.27 X F51
2023-12-05 12:45:41 C 07 58 35.002 +43 48 57.78 V T08
2023-12-05 12:47:50 C 07 58 34.829 +43 48 58.75 V T08
2023-12-05 12:52:02 C 07 58 34.582 +43 49 01.99 V T08
2023-12-05 13:02:12 C 07 58 33.790 +43 49 09.88 V T08
2023-12-06 12:11:47 C 07 57 01.498 +44 07 08.22 V T05
2023-12-06 12:14:23 C 07 57 01.226 +44 07 10.06 V T05
2023-12-06 12:18:58 C 07 57 00.862 +44 07 13.84 V T05
2023-12-06 12:26:50 C 07 57 00.346 +44 07 19.63 V T05
2023-12-06 12:56:41 C 07 56 58.023 +44 07 43.23 X F52
2023-12-06 13:13:40 C 07 56 56.724 +44 07 56.54 X F52
2023-12-06 13:30:35 C 07 56 55.429 +44 08 09.64 X F52
2023-12-06 13:47:29 C 07 56 54.135 +44 08 22.79 X F52
2023-12-07 11:20:18 C 07 55 21.413 +44 25 08.87 V T08
2023-12-07 11:24:17 C 07 55 21.139 +44 25 12.18 V T08
2023-12-07 11:31:42 C 07 55 20.465 +44 25 18.01 V T08
2023-12-07 11:46:39 C 07 55 19.291 +44 25 30.58 V T08
2023-12-08 10:45:06 C 07 53 32.083 +44 43 24.38 V T05
2023-12-08 10:49:06 C 07 53 31.704 +44 43 27.01 V T05
2023-12-08 11:28:01 C 07 53 28.380 +44 43 57.90 V T05
2023-12-08 11:36:55 C 07 53 27.559 +44 44 05.53 V T05
2023-12-09 13:31:29 C 07 51 15.610 +45 04 17.36 V T08
2023-12-09 13:32:09 C 07 51 15.545 +45 04 19.52 V T08
2023-12-09 13:57:57 C 07 51 13.030 +45 04 38.82 V T08
2023-12-09 13:58:37 C 07 51 13.049 +45 04 38.93 V T08
2023-12-11 07:48:12 C 07 47 20.422 +45 36 56.38 V G96
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)