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
2004-10-15 09:52:23 C 06 36 36.67 +37 59 47.8 19.3 c 704
2004-11-10 08:45:03 C 06 17 58.17 +45 45 31.8 19.1 c 704
2004-11-10 09:03:37 C 06 17 56.18 +45 45 46.6 18.6 c 704
2004-11-10 09:40:37 C 06 17 52.44 +45 46 14.8 19.1 c 704
2004-11-20 10:04:51 C 05 47 19.69 +48 24 18.5 18.8 c 704
2004-11-20 10:22:54 C 05 47 16.76 +48 24 27.2 18.7 c 704
2004-11-20 10:40:46 C 05 47 13.72 +48 24 36.4 18.8 c 704
2004-11-21 23:58:55 C 05 41 13.62 +48 42 17.5 o 084
2004-11-25 07:16:21 C 05 27 31.44 +49 11 40.4 r H41
2004-11-25 07:18:47 C 05 27 30.88 +49 11 41.7 r H41
2004-11-25 07:21:40 C 05 27 30.47 +49 11 42.0 r H41
2004-11-25 07:24:02 C 05 27 30.01 +49 11 43.4 r H41
2004-11-25 07:27:08 C 05 27 29.40 +49 11 43.9 r H41
2004-12-01 06:00:53 C 05 00 43.46 +49 29 27.1 18.6 c 704
2004-12-01 06:18:32 C 05 00 39.91 +49 29 26.9 18.7 c 704
2004-12-01 06:36:19 C 05 00 36.37 +49 29 26.4 18.9 c 704
2004-12-01 06:54:14 C 05 00 32.74 +49 29 25.4 18.5 c 704
2004-12-01 07:12:56 C 05 00 28.94 +49 29 25.1 18.7 c 704
2004-12-02 07:48:39 C 04 55 43.63 +49 27 27.3 r H41
2004-12-02 07:52:02 C 04 55 42.82 +49 27 27.0 r H41
2004-12-02 07:54:08 C 04 55 42.48 +49 27 25.9 r H41
2004-12-02 07:56:13 C 04 55 42.06 +49 27 25.9 r H41
2004-12-04 07:05:42 C 04 46 37.90 +49 19 34.5 r H41
2004-12-04 07:09:47 C 04 46 36.95 +49 19 34.1 r H41
2004-12-04 07:14:33 C 04 46 36.16 +49 19 32.3 r H41
2004-12-04 07:16:58 C 04 46 35.65 +49 19 30.8 r H41
2004-12-10 06:42:59 C 04 20 10.19 +48 23 49.4 18.5 c 704
2004-12-10 07:00:33 C 04 20 06.94 +48 23 37.9 18.9 c 704
2004-12-10 07:18:56 C 04 20 03.68 +48 23 29.5 18.9 c 704
2004-12-10 07:37:05 C 04 20 00.40 +48 23 19.1 18.7 c 704
2004-12-10 07:54:38 C 04 19 57.19 +48 23 09.6 18.7 c 704
2004-12-10 22:43:54 C 04 17 24.53 +48 14 51.5 17.7 c A57
2004-12-10 23:06:11 C 04 17 20.54 +48 14 39.3 18.3 c A57
2004-12-10 23:20:44 C 04 17 18.01 +48 14 30.9 18.3 c A57
2004-12-11 21:27:19 C 04 13 34.88 +48 01 24.6 c 046
2004-12-11 21:28:42 C 04 13 34.69 +48 01 24.2 c 046
2004-12-11 21:29:40 C 04 13 34.48 +48 01 23.7 c 046
2004-12-11 21:30:40 C 04 13 34.38 +48 01 23.0 c 046
2004-12-11 21:31:50 C 04 13 34.06 +48 01 22.3 c 046
2004-12-11 21:33:39 C 04 13 33.78 +48 01 21.7 c 046
2004-12-12 21:50:56 C 04 09 35.17 +47 46 02.0 c 565
2004-12-13 17:33:31 C 04 06 27.83 +47 32 47.3 o 084
2004-12-13 19:51:44 C 04 06 06.29 +47 31 19.4 c A30
2004-12-13 19:53:52 C 04 06 05.94 +47 31 17.9 c A30
2004-12-13 20:36:30 C 04 05 59.00 +47 30 47.6 r 240
2004-12-13 20:39:38 C 04 05 58.50 +47 30 45.7 r 240
2004-12-13 20:46:57 C 04 05 57.29 +47 30 41.0 r 240
2004-12-15 19:59:48 C 03 58 51.85 +46 56 48.8 r A16
2004-12-15 20:09:48 C 03 58 50.28 +46 56 42.0 r A16
2004-12-15 20:30:07 C 03 58 47.40 +46 56 26.8 r A16
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)