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
2002-03-07 19:56:21 C 03 00 31.29 +46 44 39.0 c 938
2002-03-07 19:58:46 C 03 00 28.59 +46 44 04.2 c 938
2002-03-07 20:00:42 C 03 00 26.19 +46 43 34.5 c 938
2002-03-07 22:06:37 C 02 58 03.86 +46 12 01.8 c 938
2002-03-07 22:08:44 C 02 58 01.57 +46 11 29.1 c 938
2002-03-07 22:10:14 C 02 57 59.91 +46 11 07.3 c 938
2002-03-07 22:13:03 C 02 57 56.73 +46 10 24.3 c 938
2002-03-07 22:14:00 C 02 57 55.68 +46 10 09.9 c 938
2002-03-08 19:39:35 C 02 36 57.42 +40 57 12.8 c 938
2002-03-08 19:40:35 C 02 36 56.47 +40 56 57.4 c 938
2002-03-08 19:41:43 C 02 36 55.44 +40 56 39.6 c 938
2002-03-08 19:42:47 C 02 36 54.48 +40 56 24.5 c 938
2002-03-08 19:43:38 C 02 36 53.69 +40 56 12.4 c 938
2002-03-10 18:45:53 C 02 03 44.24 +30 03 20.4 c 118
2002-03-10 19:01:49 C 02 03 35.24 +29 59 52.6 c 118
2002-03-10 19:03:36 C 02 03 34.17 +29 59 30.0 c 118
2002-10-31 10:25:32 C 08 30 01.42 +32 04 08.9 c 696
2002-10-31 10:31:15 C 08 30 01.84 +32 04 09.3 c 696
2002-11-07 10:29:20 C 08 42 27.917 +32 26 10.19 645
2002-11-07 10:30:32 C 08 42 27.994 +32 26 10.30 645
2002-12-15 08:59:20 C 09 17 21.36 +38 04 05.9 18.8 c 704
2002-12-15 09:21:16 C 09 17 21.01 +38 04 20.7 19.2 c 704
2002-12-15 10:27:33 C 09 17 20.00 +38 05 06.1 19.1 c 704
2002-12-15 10:53:04 C 09 17 19.50 +38 05 24.3 c 711
2002-12-15 11:04:00 C 09 17 19.34 +38 05 31.9 c 711
2002-12-28 08:34:42 C 09 04 52.76 +42 06 55.8 18.8 c 704
2002-12-28 08:55:03 C 09 04 51.15 +42 07 12.8 18.9 c 704
2002-12-28 09:15:27 C 09 04 49.48 +42 07 30.6 19.1 c 704
2002-12-28 09:35:56 C 09 04 47.79 +42 07 48.5 19.2 c 704
2002-12-28 09:56:20 C 09 04 46.15 +42 08 06.3 19.2 c 704
2003-01-11 05:53:55 C 08 24 15.79 +46 44 20.6 17.5 c 704
2003-01-11 06:16:54 C 08 24 11.67 +46 44 37.3 17.8 c 704
2003-01-11 06:39:23 C 08 24 07.62 +46 44 53.6 17.9 c 704
2003-01-11 07:01:32 C 08 24 03.69 +46 45 09.3 17.8 c 704
2003-01-11 07:23:45 C 08 23 59.70 +46 45 25.0 17.8 c 704
2003-01-12 03:50:01 C 08 20 28.22 +46 59 03.7 c 699
2003-01-12 04:10:50 C 08 20 24.45 +46 59 18.6 c 699
2003-01-12 04:31:39 C 08 20 20.67 +46 59 33.3 c 699
2003-01-12 04:52:22 C 08 20 16.95 +46 59 47.6 c 699
2003-01-12 18:04:20 C 08 17 55.64 +47 08 06.7 c 151
2003-01-12 18:06:42 C 08 17 55.30 +47 08 08.1 c 151
2003-01-12 18:10:15 C 08 17 54.63 +47 08 09.9 c 151
2003-01-12 18:18:31 C 08 17 53.24 +47 08 16.4 c 151
2003-01-12 23:59:36 C 08 16 49.89 +47 12 01.5 c 240
2003-01-13 00:09:50 C 08 16 47.98 +47 12 08.0 c 240
2003-01-13 00:14:56 C 08 16 47.00 +47 12 11.1 c 240
2003-01-14 07:23:08 C 08 11 00.43 +47 30 43.3 c 704
2003-01-14 07:45:14 C 08 10 56.01 +47 30 55.8 c 704
2003-01-14 08:07:22 C 08 10 51.50 +47 31 07.8 c 704
2003-01-14 08:29:29 C 08 10 47.19 +47 31 20.6 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)