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
2025-11-30 03:55:23 C 02 36 36.670 +43 24 50.40 V 703
2025-11-30 08:39:22 C 02 36 03.190 +43 20 18.53 V T05
2025-11-30 08:56:57 C 02 36 00.970 +43 20 00.31 V T05
2025-11-30 09:01:31 C 02 36 00.430 +43 19 56.24 V T05
2025-11-30 09:08:42 C 02 35 59.556 +43 19 49.48 V T05
2025-11-30 09:10:01 C 02 35 59.393 +43 19 46.85 V T05
2025-11-30 09:24:28 C 02 35 57.595 +43 19 33.46 V T05
2025-12-01 09:03:20 C 02 33 20.431 +42 56 21.66 V T05
2025-12-01 09:11:58 C 02 33 19.447 +42 56 12.66 V T05
2025-12-01 09:27:08 C 02 33 17.652 +42 55 57.25 V T05
2025-12-07 06:26:13 C 02 20 48.973 +40 37 48.97 V 703
2025-12-07 06:29:38 C 02 20 48.703 +40 37 44.98 V 703
2025-12-07 06:33:00 C 02 20 48.350 +40 37 42.46 V 703
2025-12-07 06:36:25 C 02 20 48.152 +40 37 38.96 V 703
2025-12-07 08:55:51 C 02 20 38.510 +40 35 29.40 V T05
2025-12-07 09:04:40 C 02 20 37.896 +40 35 21.41 V T05
2025-12-07 09:09:54 C 02 20 37.450 +40 35 15.40 V T05
2025-12-07 09:28:01 C 02 20 36.036 +40 34 57.50 V T05
2025-12-08 07:45:31 C 02 19 05.963 +40 13 33.78 V G96
2025-12-08 07:53:01 C 02 19 05.437 +40 13 26.36 V G96
2025-12-08 08:00:31 C 02 19 04.926 +40 13 19.02 V G96
2025-12-08 08:08:01 C 02 19 04.408 +40 13 11.57 V G96
2025-12-08 22:02:06 C 02 18 13.373 +40 00 08.68 V R17
2025-12-08 22:22:29 C 02 18 11.983 +39 59 49.09 V R17
2025-12-08 22:42:52 C 02 18 10.591 +39 59 30.12 V R17
2025-12-08 23:03:14 C 02 18 09.209 +39 59 10.43 V R17
2025-12-09 06:11:08 C 02 17 43.127 +39 52 26.90 V 703
2025-12-09 06:15:00 C 02 17 42.904 +39 52 22.94 V 703
2025-12-09 06:22:29 C 02 17 42.389 +39 52 15.82 V 703
2025-12-09 09:48:48 C 02 17 30.060 +39 49 04.94 V T08
2025-12-09 09:53:24 C 02 17 29.758 +39 49 00.70 V T08
2025-12-09 10:10:55 C 02 17 28.618 +39 48 44.35 V T08
2025-12-09 10:18:51 C 02 17 28.198 +39 48 35.96 V T08
2025-12-10 08:34:16 C 02 16 14.213 +39 27 57.42 V T08
2025-12-10 08:38:53 C 02 16 13.867 +39 27 53.10 V T08
2025-12-10 08:44:08 C 02 16 13.534 +39 27 48.02 V T08
2025-12-10 08:49:24 C 02 16 13.277 +39 27 43.31 V T08
2025-12-10 09:06:35 C 02 16 12.226 +39 27 27.58 V T08
2025-12-11 04:46:46 C 02 15 12.430 +39 09 23.30 V 703
2025-12-11 04:50:08 C 02 15 12.280 +39 09 19.40 V 703
2025-12-11 04:53:37 C 02 15 12.030 +39 09 16.30 V 703
2025-12-11 04:57:05 C 02 15 11.890 +39 09 13.70 V 703
2025-12-17 03:36:20 C 02 10 15.812 +37 06 51.05 V G96
2025-12-17 03:44:34 C 02 10 15.596 +37 06 44.53 V G96
2025-12-17 03:52:51 C 02 10 15.377 +37 06 37.94 V G96
2025-12-17 04:01:04 C 02 10 15.150 +37 06 31.14 V G96
2025-12-17 09:19:30 C 02 10 07.793 +37 02 18.60 V T05
2025-12-17 09:40:02 C 02 10 07.205 +37 02 01.03 V T05
2025-12-17 09:45:15 C 02 10 07.123 +37 01 57.18 V T05
2025-12-17 10:01:13 C 02 10 06.730 +37 01 44.04 V T05
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)