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
2002-02-23 08:13:50 C 10 30 29.92 +51 59 14.5 16.2 c 704
2002-02-23 21:54:26 C 10 24 07.224 +53 01 23.96 a 112
2002-02-23 21:58:52 C 10 24 04.856 +53 01 45.23 a 112
2002-02-23 22:01:50 C 10 24 03.265 +53 01 59.16 a 112
2002-02-23 22:08:50 C 10 23 59.537 +53 02 32.50 a 112
2002-02-23 22:14:56 C 10 23 56.262 +53 03 01.37 a 112
2002-02-24 10:48:06 C 10 17 21.70 +54 02 37.1 349
2002-02-24 10:50:22 C 10 17 20.37 +54 02 48.8 349
2002-02-24 10:52:30 C 10 17 19.14 +54 02 59.3 349
2002-02-24 10:54:30 C 10 17 17.95 +54 03 09.8 349
2002-02-24 10:59:50 C 10 17 14.79 +54 03 37.0 349
2002-02-25 22:16:56 C 09 53 25.85 +57 02 10.9 c 084
2002-02-27 02:34:28 C 09 27 33.66 +59 32 32.4 i 726
2002-02-27 02:39:27 C 09 27 28.13 +59 33 00.1 i 726
2002-02-27 02:44:27 C 09 27 22.59 +59 33 27.7 i 726
2002-02-27 02:49:28 C 09 27 17.05 +59 33 55.4 i 726
2002-02-27 02:54:28 C 09 27 11.49 +59 34 22.7 i 726
2002-02-27 02:59:28 C 09 27 05.93 +59 34 50.4 i 726
2002-03-01 00:08:53 C 08 24 53.74 +63 14 41.5 c 198
2002-03-01 00:13:14 C 08 24 46.10 +63 14 57.8 c 198
2002-03-01 00:15:25 C 08 24 42.25 +63 15 06.0 c 198
2002-03-01 00:18:40 C 08 24 36.53 +63 15 17.8 c 198
2002-03-01 00:25:10 C 08 24 25.06 +63 15 42.6 c 198
2002-03-01 00:27:23 C 08 24 21.32 +63 15 50.8 c 198
2002-03-04 01:08:37 C 05 43 16.66 +63 32 26.5 i 726
2002-03-04 01:11:08 C 05 43 10.40 +63 32 13.8 i 726
2002-03-04 01:13:37 C 05 43 04.12 +63 32 01.2 i 726
2002-03-04 01:16:08 C 05 42 57.86 +63 31 48.0 i 726
2002-03-04 01:18:38 C 05 42 51.64 +63 31 35.5 i 726
2002-03-04 01:21:08 C 05 42 45.32 +63 31 22.6 i 726
2002-03-04 13:53:51 C 05 12 45.96 +62 12 52.1 379
2002-03-04 13:57:16 C 05 12 38.02 +62 12 25.6 379
2002-03-04 13:59:52 C 05 12 31.94 +62 12 05.2 379
2002-03-04 14:00:48 C 05 12 29.79 +62 11 57.6 379
2002-03-04 14:14:13 C 05 11 58.63 +62 10 12.2 379
2002-03-04 14:17:12 C 05 11 51.64 +62 09 48.4 379
2002-03-04 14:18:00 C 05 11 49.80 +62 09 42.3 379
2002-03-04 23:29:35 C 04 51 26.94 +60 54 22.7 c 084
2002-03-05 19:48:51 C 04 10 39.82 +57 29 30.1 c 639
2002-03-05 19:53:30 C 04 10 31.10 +57 28 35.2 c 639
2002-03-05 20:00:56 C 04 10 17.11 +57 27 07.5 c 639
2002-03-05 20:06:54 C 04 10 06.01 +57 25 52.0 c 639
2002-03-05 20:12:59 C 04 09 54.67 +57 24 42.0 c 639
2002-03-05 20:19:28 C 04 09 42.49 +57 23 26.6 c 639
2002-03-05 20:25:17 C 04 09 31.75 +57 22 18.0 c 639
2002-03-07 11:03:45 C 03 10 54.90 +48 53 03.3 379
2002-03-07 11:29:30 C 03 10 22.35 +48 46 40.1 379
2002-03-07 11:30:14 C 03 10 21.35 +48 46 29.6 379
2002-03-07 19:51:09 C 03 00 37.32 +46 45 56.6 c 938
2002-03-07 19:52:39 C 03 00 35.62 +46 45 36.3 c 938
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)