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
2006-10-17 17:44:07 C 21 59 22.81 +24 56 43.6 o 151
2006-10-17 19:11:04 C 21 59 45.26 +24 55 48.9 c 434
2006-10-17 19:13:09 C 21 59 45.74 +24 55 47.6 c 434
2006-10-17 19:14:57 C 21 59 46.24 +24 55 46.4 c 434
2006-10-17 19:16:26 C 21 59 46.62 +24 55 45.4 c 434
2006-10-18 11:46:57 C 22 04 07.40 +24 44 43.1 r 379
2006-10-18 11:49:37 C 22 04 08.02 +24 44 40.9 r 379
2006-10-18 11:52:17 C 22 04 08.66 +24 44 39.5 r 379
2006-10-18 11:54:57 C 22 04 09.28 +24 44 37.5 r 379
2006-10-18 11:58:56 C 22 04 10.25 +24 44 34.9 r 379
2006-10-18 12:01:35 C 22 04 10.86 +24 44 32.5 r 379
2006-10-18 12:04:16 C 22 04 11.47 +24 44 30.6 r 379
2006-10-18 12:19:02 C 22 04 14.99 +24 44 20.7 r 379
2006-10-20 19:56:55 C 22 17 04.04 +24 08 24.9 r A89
2006-10-20 20:28:22 C 22 17 10.15 +24 08 05.4 r A89
2006-10-20 20:47:11 C 22 17 13.80 +24 07 53.5 r A89
2006-10-20 20:59:51 C 22 17 16.26 +24 07 45.7 r A89
2006-10-20 22:09:09 C 22 17 29.79 +24 07 00.9 r A89
2006-10-21 04:32:07 C 22 18 48.77 +24 03 27.3 16.2 c 704
2006-10-21 04:49:35 C 22 18 52.03 +24 03 16.2 16.3 c 704
2006-10-21 04:56:05 C 22 18 52.49 +24 03 08.1 r H45
2006-10-21 04:56:51 C 22 18 52.63 +24 03 07.6 r H45
2006-10-21 04:57:47 C 22 18 52.81 +24 03 07.0 r H45
2006-10-21 04:59:13 C 22 18 53.09 +24 03 06.1 r H45
2006-10-21 05:00:45 C 22 18 53.37 +24 03 05.0 r H45
2006-10-21 05:02:09 C 22 18 53.64 +24 03 04.1 r H45
2006-10-21 05:04:50 C 22 18 54.15 +24 03 02.4 r H45
2006-10-21 05:06:19 C 22 18 55.14 +24 03 05.7 16.1 c 704
2006-10-21 05:23:07 C 22 18 58.29 +24 02 54.7 16.2 c 704
2006-10-21 05:40:05 C 22 19 01.45 +24 02 43.9 16.0 c 704
2006-10-21 06:48:14 C 22 19 14.13 +24 02 02.0 c 711
2006-10-21 06:53:38 C 22 19 15.14 +24 01 58.4 c 711
2006-10-21 06:59:01 C 22 19 16.15 +24 01 54.7 c 711
2006-10-24 04:05:13 C 22 31 45.91 +23 23 20.8 r H45
2006-10-24 04:09:07 C 22 31 46.52 +23 23 18.8 r H45
2006-10-24 04:10:43 C 22 31 46.74 +23 23 17.7 r H45
2006-10-24 04:11:53 C 22 31 46.92 +23 23 17.0 r H45
2006-10-24 04:12:45 C 22 31 47.05 +23 23 16.5 r H45
2006-10-24 17:54:44 C 22 34 00.41 +23 16 11.1 i 071
2006-10-24 17:59:30 C 22 34 01.10 +23 16 08.7 i 071
2006-10-24 18:04:20 C 22 34 01.82 +23 16 06.3 i 071
2006-10-24 18:57:27 C 22 34 10.27 +23 15 33.7 o 151
2006-10-24 18:57:54 C 22 34 10.35 +23 15 33.5 o 151
2006-10-24 18:58:20 C 22 34 10.43 +23 15 33.1 o 151
2006-10-25 12:26:10 C 22 36 49.48 +23 07 04.1 r 379
2006-10-25 12:31:27 C 22 36 50.19 +23 07 01.5 r 379
2006-10-25 13:01:43 C 22 36 54.36 +23 06 45.8 r 379
2006-10-25 13:03:27 C 22 36 54.60 +23 06 44.9 r 379
2006-10-25 17:22:04 C 22 37 35.79 +23 04 26.7 r 113
2006-10-25 17:22:54 C 22 37 35.91 +23 04 26.3 r 113
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)