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
2006-10-07 18:09:40 C 19 50 28.489 +26 36 34.32 r 143
2006-10-07 18:31:14 C 19 50 48.966 +26 36 54.43 r 143
2006-10-07 18:34:05 C 19 50 51.696 +26 36 57.05 r 143
2006-10-07 18:39:03 C 19 50 56.385 +26 37 01.52 r 143
2006-10-07 18:43:12 C 19 51 00.323 +26 37 05.25 r 143
2006-10-07 18:47:07 C 19 51 04.037 +26 37 08.68 r 143
2006-10-07 18:58:26 C 19 51 14.760 +26 37 18.68 r 143
2006-10-07 19:06:55 C 19 51 22.776 +26 37 25.97 r 143
2006-10-07 19:18:09 C 19 51 33.57 +26 37 30.3 o 198
2006-10-07 19:18:58 C 19 51 34.33 +26 37 31.0 o 198
2006-10-07 19:20:09 C 19 51 35.46 +26 37 32.0 o 198
2006-10-07 19:20:33 C 19 51 35.83 +26 37 32.3 o 198
2006-10-07 19:25:39 C 19 51 40.68 +26 37 36.7 o 198
2006-10-08 12:18:08 C 20 07 20.87 +26 49 13.0 r 379
2006-10-08 12:25:09 C 20 07 26.86 +26 49 15.7 r 379
2006-10-08 12:47:18 C 20 07 45.86 +26 49 21.9 r 379
2006-10-08 12:52:10 C 20 07 50.06 +26 49 23.3 r 379
2006-10-08 12:53:47 C 20 07 51.45 +26 49 23.6 r 379
2006-10-08 12:55:24 C 20 07 52.84 +26 49 24.3 r 379
2006-10-08 13:06:10 C 20 08 02.09 +26 49 27.3 r 379
2006-10-08 13:09:25 C 20 08 04.89 +26 49 28.1 r 379
2006-10-08 13:16:57 C 20 08 11.38 +26 49 29.7 r 379
2006-10-08 13:21:50 C 20 08 15.55 +26 49 31.0 r 379
2006-10-08 17:21:19 C 20 11 52.36 +26 50 43.9 r 113
2006-10-08 17:21:48 C 20 11 52.78 +26 50 44.1 r 113
2006-10-08 17:22:19 C 20 11 53.21 +26 50 44.3 r 113
2006-10-08 17:22:50 C 20 11 53.64 +26 50 44.3 r 113
2006-10-08 17:23:21 C 20 11 54.06 +26 50 44.6 r 113
2006-10-08 18:40:19 C 20 12 58.400 +26 51 19.59 r 143
2006-10-08 18:44:50 C 20 13 02.119 +26 51 20.91 r 143
2006-10-08 19:01:41 C 20 13 15.996 +26 51 25.58 r 143
2006-10-08 19:07:01 C 20 13 20.397 +26 51 27.03 r 143
2006-10-08 19:07:39 C 20 13 20.96 +26 51 21.9 r 240
2006-10-08 19:11:23 C 20 13 24.06 +26 51 23.0 r 240
2006-10-08 19:12:12 C 20 13 24.653 +26 51 28.41 r 143
2006-10-08 19:12:18 C 20 13 24.79 +26 51 23.2 r 240
2006-10-08 19:14:07 C 20 13 26.28 +26 51 23.7 r 240
2006-10-08 19:14:49 C 20 13 26.43 +26 51 18.1 o 639
2006-10-08 19:15:55 C 20 13 27.79 +26 51 24.2 r 240
2006-10-08 19:16:30 C 20 13 28.171 +26 51 29.48 r 143
2006-10-08 19:16:50 C 20 13 28.51 +26 51 24.4 r 240
2006-10-08 19:18:39 C 20 13 30.03 +26 51 24.9 r 240
2006-10-08 19:18:48 C 20 13 29.73 +26 51 19.2 o 639
2006-10-08 19:19:33 C 20 13 30.78 +26 51 25.2 r 240
2006-10-08 19:20:12 C 20 13 31.212 +26 51 30.46 r 143
2006-10-08 19:20:28 C 20 13 31.53 +26 51 25.4 r 240
2006-10-08 19:25:14 C 20 13 35.03 +26 51 20.7 o 639
2006-10-08 19:28:50 C 20 13 38.00 +26 51 21.6 o 639
2006-10-08 19:49:50 C 20 13 55.42 +26 51 39.3 c A48
2006-10-08 19:51:16 C 20 13 56.56 +26 51 39.7 c A48
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)