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
2020-11-25 14:32:59 C 10 53 23.948 +17 46 12.15 U F51
2020-11-25 14:48:28 C 10 53 25.608 +17 46 03.67 U F51
2020-11-25 15:19:32 C 10 53 28.935 +17 45 46.57 U F51
2020-12-12 11:55:03 C 11 38 55.33 +13 38 13.4 V G96
2020-12-12 12:01:54 C 11 38 56.10 +13 38 08.8 V G96
2020-12-12 12:08:44 C 11 38 56.89 +13 38 04.0 V G96
2020-12-12 12:15:33 C 11 38 57.68 +13 37 59.2 V G96
2020-12-14 12:04:52 C 11 44 33.61 +13 05 06.3 V V00
2020-12-14 12:11:44 C 11 44 34.41 +13 05 01.5 V V00
2020-12-14 12:18:35 C 11 44 35.19 +13 04 56.6 V V00
2020-12-14 12:25:25 C 11 44 36.00 +13 04 52.1 V V00
2020-12-24 11:29:27 C 12 13 45.76 +10 05 07.6 V G96
2020-12-24 11:36:53 C 12 13 46.68 +10 05 01.5 V G96
2020-12-24 11:44:19 C 12 13 47.63 +10 04 56.0 V G96
2020-12-24 11:51:43 C 12 13 48.53 +10 04 50.3 V G96
2021-01-12 13:20:40 C 13 19 09.75 +02 35 53.7 V T05
2021-01-12 13:30:36 C 13 19 11.34 +02 35 41.3 V T05
2021-01-12 13:48:26 C 13 19 14.20 +02 35 20.7 V T05
2021-01-12 14:00:09 C 13 19 16.07 +02 35 06.8 V T05
2021-01-17 20:24:41 C 13 41 01.85 -00 04 33.4 q D29
2021-01-17 20:45:04 C 13 41 05.46 -00 05 01.2 q D29
2021-01-17 21:05:25 C 13 41 09.06 -00 05 28.4 q D29
2021-01-30 03:27:45 S 14 42 19.447 -07 36 25.13 L C51
2021-01-30 06:35:53 S 14 43 04.469 -07 41 49.85 L C51
2021-01-30 06:36:04 S 14 43 04.507 -07 41 49.85 L C51
2021-01-30 09:44:12 S 14 43 49.661 -07 47 15.14 L C51
2021-01-30 12:52:31 S 14 44 34.999 -07 52 41.59 L C51
2021-01-30 19:09:09 S 14 46 06.199 -08 03 35.03 L C51
2021-01-30 23:51:32 S 14 47 14.957 -08 11 47.00 L C51
2021-01-30 23:51:43 S 14 47 14.995 -08 11 47.51 L C51
2021-01-31 04:34:06 S 14 48 24.070 -08 19 59.81 L C51
2021-01-31 07:42:25 S 14 49 10.301 -08 25 31.94 L C51
2021-01-31 09:16:29 S 14 49 33.454 -08 28 16.82 L C51
2021-01-31 10:50:44 S 14 49 56.676 -08 31 02.46 L C51
2021-01-31 13:59:03 S 14 50 43.24 -08 36 33.1 L C51
2021-01-31 15:33:08 S 14 51 06.59 -08 39 18.2 L C51
2021-01-31 18:41:27 S 14 51 53.38 -08 44 51.4 L C51
2021-01-31 21:49:45 S 14 52 40.12 -08 50 24.1 L C51
2021-02-01 00:58:05 S 14 53 27.29 -08 55 57.3 L C51
2021-02-01 07:14:32 S 14 55 01.750 -09 07 04.87 L C51
2021-02-01 10:22:51 S 14 55 49.291 -09 12 41.54 L C51
2021-02-10 14:49:05 C 15 58 02.63 -15 58 49.1 V T08
2021-02-10 14:53:43 C 15 58 04.10 -15 58 57.8 V T08
2021-02-10 15:04:20 C 15 58 07.29 -15 59 17.4 V T08
2021-02-10 15:30:54 C 15 58 15.40 -16 00 07.4 V T08
2021-02-11 12:56:56 C 16 05 00.39 -16 39 28.4 V G96
2021-02-11 13:01:39 C 16 05 01.86 -16 39 37.4 V G96
2021-02-11 13:06:22 C 16 05 03.33 -16 39 45.8 V G96
2021-02-11 13:11:05 C 16 05 04.81 -16 39 54.8 V G96
2021-02-11 15:15:07 C 16 05 44.70 -16 43 35.6 V T08
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)