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
2023-12-29 23:41:44 s 1 +75726.219 0 +289259.56 3010.0 C57
2023-12-30 00:01:44 S 06 39 23.765 +49 45 18.47 V C57
2023-12-30 00:01:44 s 1 +74849.341 0 +288982.01 6990.0 C57
2023-12-30 00:21:44 S 06 39 20.251 +49 45 20.41 V C57
2023-12-30 00:21:44 s 1 +73970.854 0 +288698.37 5130.0 C57
2023-12-30 00:41:44 S 06 39 15.874 +49 45 22.93 V C57
2023-12-30 00:41:44 s 1 +73090.747 0 +288408.53 7170.0 C57
2023-12-30 01:41:44 S 06 39 02.390 +49 45 37.30 V C57
2023-12-30 01:41:44 s 1 +70440.868 0 +287501.72 4880.0 C57
2023-12-30 02:21:44 S 06 38 53.786 +49 45 30.49 V C57
2023-12-30 02:21:44 s 1 +68666.441 0 +286865.92 9410.0 C57
2023-12-30 05:01:44 S 06 38 20.501 +49 45 27.54 V C57
2023-12-30 05:01:44 s 1 +61508.264 0 +284069.18 1600.0 C57
2023-12-30 05:21:44 S 06 38 16.565 +49 45 26.28 V C57
2023-12-30 05:21:44 s 1 +60606.917 0 +283690.75 7870.0 C57
2023-12-30 05:41:44 S 06 38 12.703 +49 45 28.08 V C57
2023-12-30 05:41:44 s 1 +59704.149 0 +283305.81 5010.0 C57
2023-12-30 06:21:44 S 06 38 04.010 +49 45 27.32 V C57
2023-12-30 06:21:44 s 1 +57894.417 0 +282516.39 1100.0 C57
2023-12-30 06:41:44 S 06 37 59.426 +49 45 26.75 V C57
2023-12-30 06:41:44 s 1 +56987.486 0 +282111.87 9640.0 C57
2023-12-30 07:01:44 S 06 37 55.718 +49 45 26.64 V C57
2023-12-30 07:01:44 s 1 +56079.188 0 +281700.74 8140.0 C57
2023-12-30 07:21:44 S 06 37 50.993 +49 45 30.28 V C57
2023-12-30 07:21:44 s 1 +55169.559 0 +281283.08 6550.0 C57
2023-12-30 07:41:44 S 06 37 47.191 +49 45 25.99 V C57
2023-12-30 07:41:44 s 1 +54258.597 0 +280858.78 4510.0 C57
2023-12-30 08:01:44 S 06 37 42.173 +49 45 30.02 V C57
2023-12-30 08:01:44 s 1 +53346.313 0 +280427.80 1750.0 C57
2023-12-30 08:21:44 S 06 37 38.767 +49 45 26.71 V C57
2023-12-30 08:21:44 s 1 +52432.745 0 +279990.23 8220.0 C57
2023-12-30 08:41:44 S 06 37 33.792 +49 45 29.38 V C57
2023-12-30 08:41:44 s 1 +51517.888 0 +279545.96 3540.0 C57
2023-12-30 09:01:44 S 06 37 29.438 +49 45 30.60 V C57
2023-12-30 09:01:44 s 1 +50601.758 0 +279094.93 7460.0 C57
2023-12-30 14:01:44 S 06 36 25.330 +49 45 22.75 V C57
2023-12-30 14:01:44 s 1 +36719.160 0 +271510.23 1130.0 C57
2023-12-30 14:21:44 S 06 36 22.145 +49 45 16.96 V C57
2023-12-30 14:21:44 s 1 +35785.066 0 +270948.90 230.0 C57
2023-12-30 14:41:44 S 06 36 16.920 +49 45 20.66 V C57
2023-12-30 14:41:44 s 1 +34850.000 0 +270380.44 3620.0 C57
2023-12-30 15:01:44 S 06 36 12.883 +49 45 26.53 V C57
2023-12-30 15:01:44 s 1 +33913.977 0 +269804.82 990.0 C57
2023-12-30 17:41:44 S 06 35 39.154 +49 45 09.68 V C57
2023-12-30 17:41:44 s 1 +26394.045 0 +264940.76 3340.0 C57
2023-12-30 18:41:44 S 06 35 26.453 +49 45 02.23 V C57
2023-12-30 18:41:44 s 1 +23560.876 0 +262996.19 250.0 C57
2023-12-30 19:01:44 S 06 35 22.097 +49 44 59.46 V C57
2023-12-30 19:01:44 s 1 +22615.058 0 +262333.15 3950.0 C57
2023-12-30 19:21:44 S 06 35 17.851 +49 45 05.51 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)