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
2023-02-04 20:00:33 C 07 06 28.080 +47 28 56.71 X K74
2023-02-04 20:01:33 C 07 06 27.845 +47 28 55.99 X K74
2023-02-04 20:04:35 C 07 06 27.139 +47 28 54.66 X K74
2023-02-06 09:04:59 C 06 58 15.863 +47 09 22.40 U F51
2023-02-06 09:20:45 C 06 58 12.249 +47 09 12.80 U F51
2023-02-06 09:36:31 C 06 58 08.640 +47 09 03.08 U F51
2023-02-06 09:52:17 C 06 58 05.036 +47 08 53.24 U F51
2023-02-06 15:13:02 C 06 56 58.56 +47 05 36.5 Z C97
2023-02-06 15:17:58 C 06 56 57.46 +47 05 33.8 Z C97
2023-02-06 15:22:33 C 06 56 56.41 +47 05 31.5 Z C97
2023-02-07 19:31:01 C 06 50 55.742 +46 47 14.39 X K74
2023-02-07 19:35:03 C 06 50 54.854 +46 47 11.76 X K74
2023-02-07 19:38:35 C 06 50 54.122 +46 47 09.49 X K74
2023-02-07 20:18:43 C 06 50 45.286 +46 46 42.46 X K87
2023-02-07 20:22:56 C 06 50 44.395 +46 46 39.47 X K87
2023-02-07 20:27:10 C 06 50 43.445 +46 46 36.55 X K87
2023-02-08 04:47:46 C 06 48 58.853 +46 40 59.02 V 703
2023-02-08 04:56:02 C 06 48 57.085 +46 40 53.36 V 703
2023-02-08 05:13:35 C 06 48 53.107 +46 40 41.63 V 703
2023-02-08 20:57:33 C 06 45 38.983 +46 29 06.04 X K87
2023-02-08 20:59:39 C 06 45 38.525 +46 29 04.09 X K87
2023-02-08 21:01:46 C 06 45 38.088 +46 29 02.80 X K87
2023-02-12 17:56:26 C 06 27 50.37 +45 10 11.4 V M26
2023-02-12 18:03:14 C 06 27 49.10 +45 10 05.8 V M26
2023-02-12 18:10:03 C 06 27 47.81 +45 09 59.9 V M26
2023-02-18 03:16:33 B 06 07 05.96 +42 55 37.0 V H89
2023-02-18 04:35:47 B 06 06 54.43 +42 54 05.8 V H89
2023-02-18 05:41:40 B 06 06 44.80 +42 52 48.9 V H89
2023-02-23 18:34:39 S 05 50 36.72 +40 17 34.7 L C51
2023-02-23 21:42:03 S 05 50 17.39 +40 13 49.3 L C51
2023-02-24 00:49:27 S 05 49 58.18 +40 10 03.5 L C51
2023-02-24 02:22:58 S 05 49 48.48 +40 08 11.4 L C51
2023-02-24 02:23:09 S 05 49 48.58 +40 08 09.9 L C51
2023-02-24 06:03:06 C 05 49 25.08 +40 03 39.9 V U55
2023-02-24 06:13:48 C 05 49 23.90 +40 03 26.8 V U55
2023-02-24 06:24:30 C 05 49 22.75 +40 03 13.5 V U55
2023-02-24 11:45:10 S 05 48 51.86 +39 56 53.0 L C51
2023-03-06 00:28:21 C 05 31 35.46 +35 19 00.8 V W46
2023-03-06 00:59:14 C 05 31 33.48 +35 18 23.3 V W46
2023-03-06 01:21:50 C 05 31 32.06 +35 17 55.8 V W46
2023-03-18 06:12:03 C 05 19 50.611 +29 29 13.74 V T05
2023-03-18 06:37:32 C 05 19 49.651 +29 28 42.96 V T05
2023-03-18 06:42:06 C 05 19 49.486 +29 28 37.20 V T05
2023-03-18 06:52:12 C 05 19 49.126 +29 28 25.14 V T05
2023-10-03 10:05:14 C 07 05 17.221 +32 36 44.82 V G96
2023-10-03 10:12:38 C 07 05 17.866 +32 36 47.05 V G96
2023-10-03 10:20:03 C 07 05 18.481 +32 36 48.96 V G96
2023-10-03 10:27:28 C 07 05 19.093 +32 36 51.12 V G96
2023-10-22 10:18:41 C 07 40 44.044 +34 34 29.14 V G96
2023-10-22 10:26:12 C 07 40 44.540 +34 34 31.58 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)