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 23:45:04 S 06 24 06.470 +49 35 41.96 V C57
2024-01-01 23:45:04 s 1 -106038.87 9 +48515.127 0.907 C57
2024-01-02 01:45:04 S 06 23 41.866 +49 35 07.55 V C57
2024-01-02 01:45:04 s 1 -107859.66 3 +36116.140 0.713 C57
2024-01-02 06:05:04 S 06 22 50.064 +49 34 02.03 V C57
2024-01-02 06:05:04 s 1 -109995.63 8 + 8737.722 0.063 C57
2024-01-02 07:45:04 S 06 22 30.250 +49 33 30.20 V C57
2024-01-02 07:45:04 s 1 -110086.70 3 - 1885.356 0.715 C57
2024-01-02 08:05:04 S 06 22 26.028 +49 33 25.67 V C57
2024-01-02 08:05:04 s 1 -110052.63 8 - 4010.352 0.121 C57
2024-01-02 09:05:04 S 06 22 14.623 +49 33 12.31 V C57
2024-01-02 09:05:04 s 1 -109842.40 0 -10379.880 0.319 C57
2024-01-02 09:25:04 S 06 22 10.476 +49 33 12.31 V C57
2024-01-02 09:25:04 s 1 -109735.75 0 -12500.025 0.935 C57
2024-01-02 10:45:04 S 06 21 54.437 +49 32 45.46 V C57
2024-01-02 10:45:04 s 1 -109122.14 4 -20955.395 6870.0 C57
2024-01-02 11:05:04 S 06 21 50.393 +49 32 43.15 V C57
2024-01-02 11:05:04 s 1 -108921.25 2 -23060.983 9240.0 C57
2024-01-02 11:25:04 S 06 21 46.915 +49 32 34.40 V C57
2024-01-02 11:25:04 s 1 -108700.97 3 -25162.440 7960.0 C57
2024-01-02 11:45:04 S 06 21 43.378 +49 32 36.17 V C57
2024-01-02 11:45:04 s 1 -108461.25 4 -27259.372 3900.0 C57
2024-01-02 12:25:04 S 06 21 35.098 +49 32 20.33 V C57
2024-01-02 12:25:04 s 1 -107923.01 9 -31437.986 8830.0 C57
2024-01-02 12:45:04 S 06 21 30.905 +49 32 16.30 V C57
2024-01-02 12:45:04 s 1 -107624.19 2 -33518.797 7880.0 C57
2024-01-02 13:05:04 S 06 21 27.989 +49 32 09.24 V C57
2024-01-02 13:05:04 s 1 -107308.28 8 -35593.545 9670.0 C57
2024-01-02 13:25:04 S 06 21 23.566 +49 32 05.89 V C57
2024-01-02 13:25:04 s 1 -106969.55 1 -37661.410 6590.0 C57
2024-01-02 14:25:04 S 06 21 11.945 +49 31 54.48 V C57
2024-01-02 14:25:04 s 1 -105832.12 6 -43820.520 8040.0 C57
2024-01-02 14:45:04 S 06 21 08.566 +49 31 48.11 V C57
2024-01-02 14:45:04 s 1 -105412.27 9 -45857.206 7880.0 C57
2024-01-02 15:05:04 S 06 21 04.704 +49 31 44.36 V C57
2024-01-02 15:05:04 s 1 -104972.04 4 -47884.995 1280.0 C57
2024-01-02 15:45:04 S 06 20 56.954 +49 31 33.02 V C57
2024-01-02 15:45:04 s 1 -104029.79 5 -51911.864 9980.0 C57
2024-01-02 17:25:04 S 06 20 38.225 +49 31 14.23 V C57
2024-01-02 17:25:04 s 1 -101313.03 1 -61790.350 4080.0 C57
2024-01-02 18:25:04 S 06 20 26.998 +49 30 58.36 V C57
2024-01-02 18:25:04 s 1 -99434.655 0 -67569.309 8730.0 C57
2024-01-02 18:45:04 S 06 20 22.613 +49 30 54.36 V C57
2024-01-02 18:45:04 s 1 -98767.197 0 -69468.126 3170.0 C57
2024-01-02 19:05:04 S 06 20 19.526 +49 30 51.77 V C57
2024-01-02 19:05:04 s 1 -98079.221 0 -71352.482 9660.0 C57
2024-01-02 19:25:04 S 06 20 15.542 +49 30 38.59 V C57
2024-01-02 19:25:04 s 1 -97370.623 0 -73221.806 9250.0 C57
2024-01-02 19:45:04 S 06 20 11.894 +49 30 45.50 V C57
2024-01-02 19:45:04 s 1 -96641.553 0 -75075.704 4780.0 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)