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
2025-12-25 18:01:16 B 02 09 14.85 +34 39 59.3 X L76
2025-12-25 18:17:42 B 02 09 14.97 +34 39 48.9 X L76
2025-12-25 18:34:09 B 02 09 15.06 +34 39 38.7 X L76
2025-12-28 07:20:52 C 02 10 04.630 +34 03 41.08 V T05
2025-12-28 07:25:28 C 02 10 04.675 +34 03 38.66 V T05
2025-12-28 07:34:00 C 02 10 04.747 +34 03 32.69 V T05
2025-12-28 07:49:20 C 02 10 04.978 +34 03 25.16 V T05
2026-01-06 13:51:09 C 02 16 27.06 +32 16 59.6 V D29
2026-01-06 14:13:00 C 02 16 27.88 +32 16 51.0 V D29
2026-01-06 14:33:22 C 02 16 28.57 +32 16 42.3 V D29
2026-01-13 06:55:25 C 02 23 42.457 +31 21 36.63 X F52
2026-01-13 07:11:40 C 02 23 43.222 +31 21 31.56 X F52
2026-01-13 07:27:47 C 02 23 43.991 +31 21 26.63 X F52
2026-01-13 07:43:57 C 02 23 44.754 +31 21 21.59 X F52
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)