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
2002-02-07 14:47:23 C 11 28 52.99 +35 41 36.9 379
2002-02-07 14:50:28 C 11 28 52.86 +35 41 41.5 379
2002-02-07 14:54:41 C 11 28 52.67 +35 41 47.3 379
2002-02-07 14:59:09 C 11 28 52.48 +35 41 53.9 379
2002-02-07 15:07:22 C 11 28 52.03 +35 42 05.9 379
2002-02-09 14:37:12 C 11 26 54.35 +36 54 40.4 c 379
2002-02-09 14:49:18 C 11 26 53.60 +36 55 00.4 c 379
2002-02-10 13:49:56 C 11 25 41.13 +37 33 24.2 c 379
2002-02-10 13:54:44 C 11 25 40.77 +37 33 32.9 c 379
2002-02-10 14:27:22 C 11 25 38.51 +37 34 32.0 c 379
2002-02-10 14:30:38 C 11 25 38.23 +37 34 38.2 c 379
2002-02-10 14:34:11 C 11 25 38.01 +37 34 44.4 c 379
2002-02-10 14:37:48 C 11 25 37.71 +37 34 51.2 c 379
2002-02-10 14:41:09 C 11 25 37.44 +37 34 56.8 c 379
2002-02-10 14:44:33 C 11 25 37.23 +37 35 03.1 c 379
2002-02-10 14:48:39 C 11 25 36.91 +37 35 10.3 c 379
2002-02-10 14:53:34 C 11 25 36.55 +37 35 19.3 c 379
2002-02-12 02:51:30 C 11 23 17.66 +38 40 14.7 15.3 i 866
2002-02-12 03:11:30 C 11 23 16.02 +38 40 55.0 15.2 i 866
2002-02-12 03:33:29 C 11 23 14.21 +38 41 39.3 15.4 i 866
2002-02-12 03:53:29 C 11 23 12.51 +38 42 19.3 15.3 i 866
2002-02-12 04:55:45 C 11 23 08.39 +38 43 58.5 c 642
2002-02-12 05:03:46 C 11 23 07.79 +38 44 13.9 c 642
2002-02-12 05:06:46 C 11 23 07.57 +38 44 20.2 c 642
2002-02-12 16:27:04 C 11 22 12.42 +39 06 56.3 379
2002-02-12 16:31:20 C 11 22 11.95 +39 07 04.7 379
2002-02-12 16:35:35 C 11 22 11.52 +39 07 13.5 379
2002-02-12 16:39:50 C 11 22 11.11 +39 07 21.8 379
2002-02-14 14:12:04 C 11 18 03.56 +40 43 21.1 379
2002-02-14 14:15:38 C 11 18 03.09 +40 43 29.8 379
2002-02-14 14:19:50 C 11 18 02.59 +40 43 39.3 379
2002-02-14 14:24:21 C 11 18 02.04 +40 43 49.5 379
2002-02-14 14:28:19 C 11 18 01.51 +40 43 59.4 379
2002-02-14 14:33:06 C 11 18 00.96 +40 44 10.5 379
2002-02-14 14:38:35 C 11 18 00.32 +40 44 23.1 379
2002-02-14 14:41:09 C 11 18 00.00 +40 44 29.4 379
2002-02-14 14:44:24 C 11 17 59.55 +40 44 36.7 379
2002-02-14 14:47:12 C 11 17 59.20 +40 44 43.3 379
2002-02-14 21:43:57 C 11 17 15.22 +41 00 08.0 c 127
2002-02-14 21:49:57 C 11 17 14.52 +41 00 22.1 c 127
2002-02-14 21:55:36 C 11 17 13.83 +41 00 35.6 c 127
2002-02-14 22:22:01 C 11 17 10.21 +41 01 41.9 d 557
2002-02-14 23:19:54 C 11 17 02.92 +41 03 58.9 d 557
2002-02-15 00:02:07 C 11 16 57.52 +41 05 38.0 d 557
2002-02-15 00:48:44 C 11 16 51.50 +41 07 26.7 d 557
2002-02-15 01:30:30 C 11 16 46.10 +41 09 03.2 d 557
2002-02-15 02:15:00 C 11 16 40.35 +41 10 45.2 d 557
2002-02-15 03:02:17 C 11 16 34.29 +41 12 32.5 d 557
2002-02-15 03:37:40 C 11 16 29.79 +41 13 52.5 d 557
2002-02-15 13:54:27 C 11 15 23.27 +41 38 40.8 379
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)