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
2024-01-01 09:21:44 s 1 -81515.342 0 +129748.47 0.122 C57
2024-01-01 09:37:33 C 06 27 28.642 +49 38 08.45 X F51
2024-01-01 09:41:44 S 06 27 04.063 +49 39 23.98 V C57
2024-01-01 09:41:44 s 1 -82254.733 0 +128055.55 0.669 C57
2024-01-01 09:55:36 C 06 27 24.948 +49 38 08.30 X F51
2024-01-01 10:01:44 S 06 26 59.594 +49 39 09.04 V C57
2024-01-01 10:01:44 s 1 -82987.926 0 +126352.93 0.747 C57
2024-01-01 10:13:41 C 06 27 21.238 +49 38 08.03 X F51
2024-01-01 10:21:44 S 06 26 56.347 +49 39 04.39 V C57
2024-01-01 10:21:44 s 1 -83714.898 0 +124640.79 0.395 C57
2024-01-01 11:01:44 S 06 26 47.134 +49 38 58.56 V C57
2024-01-01 11:01:44 s 1 -85149.395 0 +121187.64 0.528 C57
2024-01-01 11:21:44 S 06 26 42.754 +49 38 55.28 V C57
2024-01-01 11:21:44 s 1 -85856.752 0 +119446.81 0.916 C57
2024-01-01 11:41:44 S 06 26 38.388 +49 38 53.59 V C57
2024-01-01 11:41:44 s 1 -86557.283 0 +117696.44 0.28 C57
2024-01-01 12:01:44 S 06 26 34.308 +49 38 44.09 V C57
2024-01-01 12:01:44 s 1 -87250.838 0 +115936.55 0.479 C57
2024-01-01 12:21:44 S 06 26 30.600 +49 38 37.61 V C57
2024-01-01 12:21:44 s 1 -87937.393 0 +114167.32 0.554 C57
2024-01-01 12:41:44 S 06 26 25.661 +49 38 33.43 V C57
2024-01-01 12:41:44 s 1 -88616.715 0 +112388.65 0.248 C57
2024-01-01 13:01:44 S 06 26 21.823 +49 38 26.30 V C57
2024-01-01 13:01:44 s 1 -89288.646 0 +110600.57 0.414 C57
2024-01-01 13:21:44 S 06 26 17.599 +49 38 20.98 V C57
2024-01-01 13:21:44 s 1 -89953.164 0 +108803.28 0.099 C57
2024-01-01 14:05:04 S 06 26 08.885 +49 38 15.68 V C57
2024-01-01 14:05:04 s 1 -91366.372 0 +104877.17 0.224 C57
2024-01-01 14:25:04 S 06 26 03.485 +49 38 08.92 V C57
2024-01-01 14:25:04 s 1 -92006.181 0 +103050.66 0.51 C57
2024-01-01 15:05:04 S 06 25 55.716 +49 37 54.70 V C57
2024-01-01 15:05:04 s 1 -93261.395 0 +99370.445 0.701 C57
2024-01-01 15:25:04 S 06 25 51.480 +49 37 52.25 V C57
2024-01-01 15:25:04 s 1 -93876.463 0 +97516.819 0.305 C57
2024-01-01 15:45:04 S 06 25 47.441 +49 37 46.78 V C57
2024-01-01 15:45:04 s 1 -94482.979 0 +95654.282 0.432 C57
2024-01-01 16:05:04 S 06 25 43.195 +49 37 39.36 V C57
2024-01-01 16:05:04 s 1 -95080.817 0 +93782.934 0.993 C57
2024-01-01 16:45:04 S 06 25 34.752 +49 37 32.12 V C57
2024-01-01 16:45:04 s 1 -96249.659 0 +90013.928 0.684 C57
2024-01-01 17:05:04 S 06 25 30.972 +49 37 24.71 V C57
2024-01-01 17:05:04 s 1 -96820.409 0 +88116.490 0.647 C57
2024-01-01 17:45:04 S 06 25 22.445 +49 37 18.80 V C57
2024-01-01 17:45:04 s 1 -97933.605 0 +84296.029 0.97 C57
2024-01-01 18:05:04 S 06 25 18.242 +49 37 13.80 V C57
2024-01-01 18:05:04 s 1 -98475.790 0 +82373.246 0.163 C57
2024-01-01 21:05:04 S 06 24 40.836 +49 36 22.90 V C57
2024-01-01 21:05:04 s 1 -102890.62 2 +64708.802 0.431 C57
2024-01-01 21:25:04 S 06 24 36.134 +49 36 14.54 V C57
2024-01-01 21:25:04 s 1 -103326.24 8 +62708.293 0.444 C57
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)