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
2022-03-03 18:10:23 V 18 02 28.57 +19 44 06.6 15.1 V 270
2022-03-03 18:10:23 v 1 134.17915 +34.51213 270
2022-03-03 18:18:35 V 18 02 44.55 +19 42 39.8 14.9 V 270
2022-03-03 18:18:35 v 1 134.17915 +34.51213 270
2022-03-03 18:26:00 V 18 02 58.88 +19 41 22.2 15.2 V 270
2022-03-03 18:26:00 v 1 134.17915 +34.51213 270
2022-03-04 04:26:06 C 18 22 32.01 +17 47 31.4 V C23
2022-03-04 04:28:03 C 18 22 35.75 +17 47 08.5 V C23
2022-03-04 04:30:00 C 18 22 39.51 +17 46 45.9 V C23
2022-03-04 04:31:43 C 18 22 42.79 +17 46 25.8 V C23
2022-10-20 11:03:43 C 08 15 08.838 +31 02 40.13 V G96
2022-10-20 11:11:14 C 08 15 09.508 +31 02 40.16 V G96
2022-10-20 11:18:44 C 08 15 10.145 +31 02 40.60 V G96
2022-10-20 11:26:14 C 08 15 10.825 +31 02 40.70 V G96
2022-10-28 14:13:37 C 08 32 11.273 +31 09 27.71 U F52
2022-10-28 14:30:55 C 08 32 12.688 +31 09 28.45 U F52
2022-10-28 14:48:13 C 08 32 14.090 +31 09 29.37 U F52
2022-10-28 15:05:33 C 08 32 15.501 +31 09 30.34 U F52
2022-11-23 10:11:08 C 09 16 56.845 +32 18 56.34 V 703
2022-11-23 10:18:57 C 09 16 57.263 +32 18 57.92 V 703
2022-11-23 10:26:47 C 09 16 57.605 +32 18 59.72 V 703
2022-11-23 10:34:37 C 09 16 58.112 +32 19 00.95 V 703
2022-11-26 10:12:44 C 09 20 55.064 +32 35 42.79 V G96
2022-11-26 10:20:12 C 09 20 55.450 +32 35 44.74 V G96
2022-11-26 10:27:40 C 09 20 55.820 +32 35 46.68 V G96
2022-11-26 10:35:09 C 09 20 56.191 +32 35 48.66 V G96
2022-12-02 13:11:35 C 09 27 55.977 +33 18 27.06 U F52
2022-12-02 13:28:01 C 09 27 56.601 +33 18 32.75 U F52
2022-12-02 13:44:25 C 09 27 57.231 +33 18 38.43 U F52
2022-12-02 14:00:52 C 09 27 57.855 +33 18 44.07 U F52
2022-12-20 07:42:43 C 09 37 02.471 +36 44 17.38 V 703
2022-12-20 07:50:28 C 09 37 02.384 +36 44 22.06 V 703
2022-12-20 07:58:13 C 09 37 02.384 +36 44 28.07 V 703
2022-12-20 08:10:10 C 09 37 02.269 +36 44 34.48 V 703
2022-12-23 07:35:25 C 09 36 15.494 +37 33 16.06 V 703
2022-12-23 07:43:17 C 09 36 15.354 +37 33 22.72 V 703
2022-12-23 07:51:08 C 09 36 15.257 +37 33 28.19 V 703
2022-12-23 07:58:58 C 09 36 14.998 +37 33 33.55 V 703
2022-12-23 17:28:48 C 09 36 04.65 +37 40 22.9 V D29
2022-12-23 17:49:10 C 09 36 04.15 +37 40 38.0 V D29
2022-12-23 18:09:32 C 09 36 03.66 +37 40 52.9 V D29
2022-12-25 18:19:05 B 09 34 57.156 +38 16 23.93 W N86
2022-12-25 18:30:44 B 09 34 56.696 +38 16 34.42 W N86
2022-12-25 18:42:38 B 09 34 56.335 +38 16 43.92 W N86
2022-12-26 07:34:11 C 09 34 34.097 +38 26 36.78 V 703
2022-12-26 07:42:02 C 09 34 33.906 +38 26 43.91 V 703
2022-12-26 07:49:53 C 09 34 33.661 +38 26 50.24 V 703
2022-12-26 07:57:44 C 09 34 33.280 +38 26 56.15 V 703
2023-01-06 00:33:57 C 09 19 26.12 +42 05 36.7 V 130
2023-01-06 00:36:49 C 09 19 25.80 +42 05 39.3 V 130
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)