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
2023-12-31 22:01:44 S 06 29 34.001 +49 41 51.61 V C57
2023-12-31 22:01:44 s 1 -53492.507 0 +181517.81 0.032 C57
2023-12-31 22:21:44 S 06 29 29.714 +49 41 42.54 V C57
2023-12-31 22:21:44 s 1 -54378.711 0 +180155.16 0.581 C57
2023-12-31 22:41:44 S 06 29 25.423 +49 41 36.96 V C57
2023-12-31 22:41:44 s 1 -55262.052 0 +178782.90 0.937 C57
2023-12-31 23:01:44 S 06 29 20.875 +49 41 40.49 V C57
2023-12-31 23:01:44 s 1 -56142.446 0 +177401.00 0.005 C57
2023-12-31 23:21:44 S 06 29 16.788 +49 41 30.01 V C57
2023-12-31 23:21:44 s 1 -57019.865 0 +176009.59 0.805 C57
2023-12-31 23:41:44 S 06 29 12.679 +49 41 25.44 V C57
2023-12-31 23:41:44 s 1 -57894.191 0 +174608.52 0.171 C57
2024-01-01 00:21:44 S 06 29 04.046 +49 41 17.84 V C57
2024-01-01 00:21:44 s 1 -59633.276 0 +171777.45 0.327 C57
2024-01-01 02:21:44 S 06 28 38.750 +49 40 55.45 V C57
2024-01-01 02:21:44 s 1 -64768.169 0 +163051.86 0.236 C57
2024-01-01 02:41:44 S 06 28 34.284 +49 40 50.81 V C57
2024-01-01 02:41:44 s 1 -65611.082 0 +161563.59 0.104 C57
2024-01-01 03:21:44 S 06 28 25.853 +49 40 40.66 V C57
2024-01-01 03:21:44 s 1 -67285.042 0 +158557.79 0.914 C57
2024-01-01 03:41:44 S 06 28 20.899 +49 40 40.15 V C57
2024-01-01 03:41:44 s 1 -68115.912 0 +157040.26 0.688 C57
2024-01-01 04:01:44 S 06 28 17.042 +49 40 31.40 V C57
2024-01-01 04:01:44 s 1 -68942.557 0 +155512.92 0.865 C57
2024-01-01 04:21:44 S 06 28 11.695 +49 40 34.18 V C57
2024-01-01 04:21:44 s 1 -69764.947 0 +153975.90 0.472 C57
2024-01-01 05:21:44 S 06 27 59.090 +49 40 14.45 V C57
2024-01-01 05:21:44 s 1 -72205.303 0 +149306.08 0.354 C57
2024-01-01 05:41:44 S 06 27 55.447 +49 40 09.52 V C57
2024-01-01 05:41:44 s 1 -73009.507 0 +147729.93 0.383 C57
2024-01-01 07:01:44 S 06 27 37.606 +49 39 49.39 V C57
2024-01-01 07:01:44 s 1 -76177.263 0 +141327.55 0.081 C57
2024-01-01 07:07:36 C 06 27 57.647 +49 38 06.83 V 703
2024-01-01 07:12:38 C 06 27 56.696 +49 38 06.07 V 703
2024-01-01 07:17:40 C 06 27 55.645 +49 38 06.18 V 703
2024-01-01 07:21:44 S 06 27 34.658 +49 39 52.56 V C57
2024-01-01 07:21:44 s 1 -76956.443 0 +139702.61 0.456 C57
2024-01-01 07:22:09 C 06 27 54.731 +49 38 06.07 V 703
2024-01-01 07:41:44 S 06 27 30.098 +49 39 46.37 V C57
2024-01-01 07:41:44 s 1 -77730.269 0 +138067.89 0.151 C57
2024-01-01 08:01:44 S 06 27 25.219 +49 39 39.64 V C57
2024-01-01 08:01:44 s 1 -78498.613 0 +136423.37 0.039 C57
2024-01-01 08:21:44 S 06 27 21.074 +49 39 35.35 V C57
2024-01-01 08:21:44 s 1 -79261.449 0 +134769.23 0.153 C57
2024-01-01 08:41:44 S 06 27 17.357 +49 39 26.89 V C57
2024-01-01 08:41:44 s 1 -80018.587 0 +133105.34 0.264 C57
2024-01-01 09:01:44 S 06 27 12.790 +49 39 21.60 V C57
2024-01-01 09:01:44 s 1 -80769.893 0 +131431.70 0.242 C57
2024-01-01 09:19:26 C 06 27 32.352 +49 38 08.48 X F51
2024-01-01 09:21:44 S 06 27 08.741 +49 39 25.85 V 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)