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
2002-02-15 14:03:54 C 11 15 21.93 +41 39 04.6 379
2002-02-15 14:18:42 C 11 15 19.83 +41 39 41.5 379
2002-02-15 14:21:46 C 11 15 19.40 +41 39 49.4 379
2002-02-15 18:19:29 C 11 14 51.57 +41 48 42.7 d 557
2002-02-15 18:46:17 C 11 14 48.23 +41 49 52.1 d 557
2002-02-15 19:15:24 C 11 14 44.54 +41 51 07.4 d 557
2002-02-15 19:46:18 C 11 14 40.53 +41 52 27.4 d 557
2002-02-15 20:10:13 C 11 14 37.35 +41 53 29.4 d 557
2002-02-15 20:46:32 C 11 14 32.44 +41 55 03.3 d 557
2002-02-15 21:17:40 C 11 14 28.16 +41 56 23.6 d 557
2002-02-15 21:52:32 C 11 14 23.27 +41 57 53.3 d 557
2002-02-15 22:18:27 C 11 14 20.02 +41 58 59.4 c 198
2002-02-15 22:25:58 C 11 14 18.96 +41 59 18.5 c 198
2002-02-15 22:35:45 C 11 14 17.55 +41 59 43.5 c 198
2002-02-16 04:21:23 C 11 13 34.32 +42 13 48.8 c 642
2002-02-16 04:24:22 C 11 13 33.94 +42 13 56.5 c 642
2002-02-16 04:27:22 C 11 13 33.60 +42 14 04.1 c 642
2002-02-16 14:04:23 C 11 12 13.34 +42 39 23.2 379
2002-02-16 14:08:55 C 11 12 12.61 +42 39 35.2 379
2002-02-16 14:13:47 C 11 12 11.85 +42 39 48.9 379
2002-02-16 14:18:35 C 11 12 11.03 +42 40 01.6 379
2002-02-16 19:24:11 C 11 11 28.75 +42 52 46.2 d 557
2002-02-16 19:29:02 C 11 11 28.01 +42 52 59.7 d 557
2002-02-16 19:44:18 C 11 11 25.70 +42 53 42.3 d 557
2002-02-16 19:45:31 C 11 11 25.52 +42 53 45.6 d 557
2002-02-16 20:16:51 C 11 11 21.09 +42 55 12.1 151
2002-02-16 20:21:31 C 11 11 20.41 +42 55 25.0 151
2002-02-16 20:24:21 C 11 11 19.95 +42 55 33.2 151
2002-02-16 20:26:30 C 11 11 19.63 +42 55 39.1 151
2002-02-16 20:29:00 C 11 11 19.22 +42 55 46.2 151
2002-02-16 20:31:43 C 11 11 18.82 +42 55 53.7 151
2002-02-16 21:49:12 C 11 11 06.42 +42 59 28.6 c 198
2002-02-16 22:01:41 C 11 11 04.37 +43 00 03.4 c 198
2002-02-16 22:12:10 C 11 11 02.68 +43 00 32.4 c 198
2002-02-17 19:29:52 C 11 07 41.89 +43 59 08.0 151
2002-02-17 19:43:09 C 11 07 39.52 +43 59 48.6 151
2002-02-17 19:46:37 C 11 07 39.02 +43 59 58.9 151
2002-02-17 19:48:24 C 11 07 38.60 +44 00 04.3 151
2002-02-17 19:50:56 C 11 07 38.18 +44 00 11.8 151
2002-02-17 19:54:21 C 11 07 37.61 +44 00 21.9 151
2002-02-17 22:05:47 C 11 07 13.42 +44 06 56.7 c 198
2002-02-17 22:13:02 C 11 07 11.99 +44 07 18.1 c 198
2002-02-17 22:16:38 C 11 07 11.31 +44 07 28.9 c 198
2002-02-18 01:08:23 C 11 06 37.92 +44 15 53.9 c 198
2002-02-18 01:12:35 C 11 06 37.10 +44 16 06.4 c 198
2002-02-18 01:18:52 C 11 06 35.86 +44 16 24.9 c 198
2002-02-18 01:23:02 C 11 06 35.06 +44 16 37.0 c 198
2002-02-18 13:21:31 C 11 04 28.28 +44 52 25.6 379
2002-02-18 13:39:07 C 11 04 24.53 +44 53 21.3 379
2002-02-18 13:48:26 C 11 04 22.56 +44 53 50.6 379
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)