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
2025-01-07 08:01:14 C 03 36 34.524 +41 31 02.24 V T05
2025-01-07 08:09:46 C 03 36 34.118 +41 30 55.40 V T05
2025-01-18 06:36:38 C 03 31 35.381 +38 15 00.97 X F52
2025-01-18 06:53:20 C 03 31 35.330 +38 14 49.72 X F52
2025-01-18 07:10:01 C 03 31 35.285 +38 14 38.51 X F52
2025-01-21 03:58:16 C 03 32 04.578 +37 30 32.29 V G96
2025-01-21 04:05:42 C 03 32 04.625 +37 30 27.61 V G96
2025-01-21 04:13:07 C 03 32 04.700 +37 30 22.93 V G96
2025-01-21 04:20:33 C 03 32 04.751 +37 30 18.22 V G96
2025-02-13 06:45:42 C 03 54 18.988 +33 17 15.26 X F52
2025-02-13 07:17:07 C 03 54 20.842 +33 17 04.65 X F52
2025-02-13 07:32:50 C 03 54 21.760 +33 16 59.32 X F52
2025-02-17 02:42:17 C 04 00 17.557 +32 48 38.27 V G96
2025-02-17 02:50:23 C 04 00 18.097 +32 48 36.29 V G96
2025-02-17 02:58:30 C 04 00 18.572 +32 48 33.34 V G96
2025-02-26 02:46:16 C 04 16 06.971 +31 50 13.34 V G96
2025-02-26 02:53:43 C 04 16 07.572 +31 50 11.18 V G96
2025-02-26 03:01:11 C 04 16 08.134 +31 50 09.38 V G96
2025-02-26 03:11:13 C 04 16 08.864 +31 50 06.79 V G96
2025-09-17 13:48:17 C 06 02 28.104 +31 39 29.09 V T05
2025-09-17 13:52:57 C 06 02 28.049 +31 39 34.13 V T05
2025-09-17 14:00:30 C 06 02 28.015 +31 39 40.72 V T05
2025-09-17 14:15:05 C 06 02 27.905 +31 39 55.08 V T05
2025-09-22 14:05:26 C 06 02 10.114 +33 33 06.37 V T08
2025-09-22 14:12:52 C 06 02 09.991 +33 33 13.28 V T08
2025-09-22 14:29:50 C 06 02 09.780 +33 33 29.92 V T08
2025-09-22 14:31:54 C 06 02 09.706 +33 33 31.57 V T08
2025-09-23 13:56:25 C 06 02 00.977 +33 55 44.15 V T05
2025-09-23 14:00:59 C 06 02 00.912 +33 55 48.25 V T05
2025-09-23 14:14:15 C 06 02 00.715 +33 56 01.14 V T05
2025-09-23 14:22:39 C 06 02 00.617 +33 56 09.89 V T05
2025-09-25 13:31:31 C 06 01 35.414 +34 41 04.78 V T05
2025-09-25 13:36:09 C 06 01 35.441 +34 41 09.67 V T05
2025-09-25 13:36:49 C 06 01 35.470 +34 41 09.71 V T05
2025-09-25 13:45:20 C 06 01 35.143 +34 41 18.89 V T05
2025-09-25 13:59:23 C 06 01 34.942 +34 41 32.75 V T05
2025-09-30 13:12:25 C 05 59 36.926 +36 36 30.20 V T05
2025-09-30 13:23:26 C 05 59 36.631 +36 36 41.54 V T05
2025-09-30 13:30:37 C 05 59 36.418 +36 36 48.71 V T05
2025-09-30 13:35:13 C 05 59 36.276 +36 36 53.17 V T05
2025-09-30 13:37:49 C 05 59 36.173 +36 36 56.34 V T05
2025-09-30 13:43:05 C 05 59 36.000 +36 37 01.34 V T05
2025-09-30 14:15:55 C 05 59 35.002 +36 37 34.39 V T05
2025-10-01 02:59:18 C 05 59 17.582 +36 49 51.06 V R17
2025-10-01 03:19:41 C 05 59 17.004 +36 50 11.58 V R17
2025-10-01 03:40:03 C 05 59 16.402 +36 50 32.32 V R17
2025-10-01 04:00:25 C 05 59 15.732 +36 50 53.05 V R17
2025-10-01 10:38:27 C 05 59 05.610 +36 57 20.30 V G96
2025-10-01 10:47:06 C 05 59 05.340 +36 57 28.90 V G96
2025-10-01 10:55:41 C 05 59 05.060 +36 57 37.60 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)