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
2006-10-08 19:52:42 C 20 13 57.74 +26 51 39.9 c A48
2006-10-08 19:54:08 C 20 13 58.93 +26 51 40.3 c A48
2006-10-08 20:22:03 C 20 14 21.74 +26 51 45.7 c A53
2006-10-08 20:24:50 C 20 14 24.05 +26 51 45.7 c A53
2006-10-08 20:28:13 C 20 14 26.79 +26 51 46.9 c A53
2006-10-08 20:30:59 C 20 14 29.06 +26 51 47.2 c A53
2006-10-08 20:34:04 C 20 14 31.60 +26 51 47.7 c A53
2006-10-09 10:48:44 C 20 26 06.70 +26 54 05.7 r 379
2006-10-09 10:52:15 C 20 26 09.30 +26 54 05.6 r 379
2006-10-09 11:03:57 C 20 26 18.00 +26 54 05.0 r 379
2006-10-09 11:07:28 C 20 26 20.58 +26 54 04.8 r 379
2006-10-09 11:15:26 C 20 26 26.52 +26 54 04.4 r 379
2006-10-09 11:18:57 C 20 26 29.13 +26 54 04.1 r 379
2006-10-09 11:20:45 C 20 26 31.05 +26 54 05.8 300
2006-10-09 11:22:28 C 20 26 31.73 +26 54 03.7 r 379
2006-10-09 11:30:09 C 20 26 37.45 +26 54 03.5 r 379
2006-10-09 11:31:53 C 20 26 39.30 +26 54 04.9 300
2006-10-09 11:40:42 C 20 26 45.25 +26 54 02.3 r 379
2006-10-09 11:42:46 C 20 26 47.32 +26 54 04.3 300
2006-10-09 11:53:44 C 20 26 55.38 +26 54 03.4 300
2006-10-09 17:59:52 C 20 31 36.79 +26 53 09.6 r 113
2006-10-09 18:00:44 C 20 31 37.42 +26 53 09.5 r 113
2006-10-09 18:01:24 C 20 31 37.91 +26 53 09.5 r 113
2006-10-09 18:03:56 C 20 31 39.71 +26 53 09.3 r 113
2006-10-09 18:30:10 C 20 31 58.81 +26 53 17.6 c A53
2006-10-09 18:34:28 C 20 32 01.88 +26 53 16.8 c A53
2006-10-09 18:39:05 C 20 32 05.18 +26 53 16.3 c A53
2006-10-09 18:43:43 C 20 32 08.46 +26 53 16.1 c A53
2006-10-09 19:20:42 C 20 32 35.031 +26 53 09.52 r 143
2006-10-09 19:23:36 C 20 32 37.086 +26 53 09.14 r 143
2006-10-09 19:26:34 C 20 32 39.200 +26 53 08.67 r 143
2006-10-09 19:29:31 C 20 32 41.297 +26 53 08.27 r 143
2006-10-09 19:47:47 C 20 32 54.263 +26 53 05.12 r 143
2006-10-09 19:50:42 C 20 32 56.334 +26 53 04.59 r 143
2006-10-09 19:53:37 C 20 32 58.405 +26 53 04.07 r 143
2006-10-09 19:56:31 C 20 33 00.454 +26 53 03.50 r 143
2006-10-09 19:59:26 C 20 33 02.508 +26 53 02.95 r 143
2006-10-09 20:02:20 C 20 33 04.577 +26 53 02.34 r 143
2006-10-09 20:12:30 C 20 33 11.773 +26 53 00.45 r 143
2006-10-09 20:49:30 C 20 33 37.952 +26 52 52.37 r 143
2006-10-09 20:52:21 C 20 33 39.974 +26 52 51.70 r 143
2006-10-09 20:58:02 C 20 33 44.001 +26 52 50.28 r 143
2006-10-09 21:00:52 C 20 33 46.007 +26 52 49.58 r 143
2006-10-10 09:23:07 C 20 42 34.58 +26 50 31.0 r 379
2006-10-10 09:27:59 C 20 42 37.74 +26 50 29.7 r 379
2006-10-10 09:31:30 C 20 42 40.00 +26 50 28.9 r 379
2006-10-10 09:35:00 C 20 42 42.29 +26 50 27.9 r 379
2006-10-10 09:44:35 C 20 42 48.49 +26 50 25.5 r 379
2006-10-10 09:46:21 C 20 42 49.63 +26 50 25.3 r 379
2006-10-10 10:17:56 C 20 43 09.99 +26 50 15.6 r 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)