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
2001-02-02 11:22:28 C 14 39 54.75 -05 18 27.0 18.4 c 704
2001-02-02 12:04:47 C 14 40 05.18 -05 19 42.8 19.1 c 704
2001-02-02 12:25:47 C 14 40 10.20 -05 20 21.5 18.8 c 704
2001-02-02 12:46:48 C 14 40 15.47 -05 21 01.1 18.8 c 704
2001-02-03 11:21:09 C 14 46 01.53 -06 02 46.6 17.9 c 704
2001-02-03 11:42:37 C 14 46 06.93 -06 03 27.0 18.4 c 704
2001-02-03 12:04:28 C 14 46 12.50 -06 04 07.5 17.7 c 704
2001-02-03 12:26:02 C 14 46 17.87 -06 04 48.1 18.3 c 704
2001-02-03 14:37:30 C 14 46 52.99 -06 08 20.9 474
2001-02-03 14:40:19 C 14 46 53.62 -06 08 25.6 474
2001-02-04 10:29:02 C 14 52 05.61 -06 46 33.9 918
2001-02-04 10:34:13 C 14 52 06.97 -06 46 44.4 918
2001-02-04 10:38:28 C 14 52 08.15 -06 46 53.3 918
2001-02-04 10:47:38 C 14 52 09.98 -06 47 14.5 912
2001-02-05 11:20:07 C 14 58 48.32 -07 34 33.2 18.8 c 704
2001-02-05 11:41:50 C 14 58 53.99 -07 35 14.7 19.2 c 704
2001-02-05 12:03:14 C 14 58 59.86 -07 35 57.3 18.4 c 704
2001-02-05 12:24:41 C 14 59 05.58 -07 36 38.9 19.0 c 704
2001-02-06 15:10:09 C 15 06 34.29 -08 28 52.5 474
2001-02-06 15:12:29 C 15 06 35.14 -08 28 56.4 474
2001-02-06 15:16:49 C 15 06 36.21 -08 29 06.4 474
2001-02-15 06:27:31 C 16 12 57.35 -15 41 13.8 950
2001-02-15 06:30:13 C 16 12 58.29 -15 41 19.5 950
2001-02-15 06:32:50 C 16 12 59.21 -15 41 25.1 950
2002-01-05 01:31:16 C 11 10 56.07 +26 38 36.5 d 611
2002-01-05 01:53:55 C 11 10 57.30 +26 38 41.3 d 611
2002-01-05 02:52:18 C 11 11 00.18 +26 38 56.1 d 611
2002-01-05 03:04:33 C 11 11 00.79 +26 38 59.6 d 611
2002-01-05 03:11:13 C 11 11 01.08 +26 39 01.0 d 611
2002-01-05 03:14:25 C 11 11 01.22 +26 39 01.4 d 611
2002-01-05 03:18:08 C 11 11 01.45 +26 39 02.6 d 611
2002-01-05 21:39:04 C 11 12 01.19 +26 43 25.5 c 046
2002-01-05 21:40:14 C 11 12 01.25 +26 43 23.2 d 611
2002-01-05 21:43:25 C 11 12 01.42 +26 43 26.9 c 046
2002-01-05 21:45:27 C 11 12 01.56 +26 43 28.0 c 046
2002-01-05 21:47:31 C 11 12 01.61 +26 43 28.0 c 046
2002-01-05 21:49:00 C 11 12 01.57 +26 43 27.4 d 611
2002-01-05 21:51:44 C 11 12 01.72 +26 43 27.5 d 611
2002-01-05 21:54:20 C 11 12 01.88 +26 43 28.6 d 611
2002-01-05 21:56:53 C 11 12 02.01 +26 43 30.5 d 611
2002-01-05 23:22:19 C 11 12 06.27 +26 43 51.8 c 113
2002-01-05 23:29:45 C 11 12 06.72 +26 43 54.4 c 113
2002-01-05 23:33:30 C 11 12 06.95 +26 43 55.7 c 113
2002-01-05 23:37:13 C 11 12 07.13 +26 43 56.8 c 113
2002-01-06 02:37:09 C 11 12 16.15 +26 44 47.9 104
2002-01-06 02:40:31 C 11 12 16.35 +26 44 48.3 104
2002-01-06 02:43:01 C 11 12 16.43 +26 44 49.2 104
2002-01-06 02:46:11 C 11 12 16.57 +26 44 49.9 104
2002-01-08 09:11:17 C 11 15 04.58 +26 59 45.0 18.9 c 704
2002-01-08 09:32:52 C 11 15 05.49 +26 59 50.8 19.3 c 704
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)