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
2025-10-01 11:04:37 C 05 59 04.769 +36 57 46.48 V G96
2025-10-01 13:16:57 C 05 59 01.822 +36 59 58.67 V T05
2025-10-01 13:20:15 C 05 59 01.726 +37 00 02.38 V T05
2025-10-01 13:21:33 C 05 59 01.673 +37 00 03.35 V T05
2025-10-01 13:22:52 C 05 59 01.620 +37 00 05.47 V T05
2025-10-01 13:28:52 C 05 59 01.409 +37 00 11.34 V T05
2025-10-01 13:43:33 C 05 59 00.926 +37 00 26.24 V T05
2025-10-01 13:44:12 C 05 59 00.979 +37 00 26.50 V T05
2025-10-05 12:42:52 C 05 55 58.255 +38 33 48.42 V T08
2025-10-05 12:48:13 C 05 55 57.974 +38 33 54.07 V T08
2025-10-05 13:02:52 C 05 55 57.300 +38 34 09.08 V T08
2025-10-05 13:16:24 C 05 55 56.647 +38 34 22.91 V T08
2025-10-09 12:20:17 C 05 51 29.940 +40 08 46.28 V T08
2025-10-09 12:24:18 C 05 51 29.774 +40 08 50.71 V T08
2025-10-09 12:37:49 C 05 51 28.870 +40 09 04.90 V T08
2025-10-09 12:57:48 C 05 51 27.595 +40 09 25.67 V T08
2025-10-15 12:48:32 C 05 41 23.539 +42 31 55.42 V T08
2025-10-15 12:53:13 C 05 41 23.150 +42 31 59.70 V T08
2025-10-15 13:02:27 C 05 41 22.248 +42 32 09.38 V T08
2025-10-22 02:46:54 C 05 24 38.218 +45 00 11.66 V R17
2025-10-22 03:06:31 C 05 24 35.542 +45 00 29.70 V R17
2025-10-22 03:26:09 C 05 24 32.885 +45 00 47.48 V R17
2025-10-22 03:45:47 C 05 24 30.178 +45 01 05.20 V R17
2025-10-23 12:04:57 C 05 20 14.875 +45 29 06.54 V T08
2025-10-23 12:08:56 C 05 20 14.275 +45 29 09.96 V T08
2025-10-23 12:18:32 C 05 20 12.866 +45 29 18.56 V T08
2025-10-23 12:39:49 C 05 20 09.761 +45 29 36.89 V T08
2025-10-24 11:29:41 C 05 16 58.966 +45 48 38.09 V T08
2025-10-24 11:43:45 C 05 16 56.808 +45 48 50.51 V T08
2025-10-24 11:49:01 C 05 16 56.009 +45 48 54.76 V T08
2025-10-24 11:57:38 C 05 16 54.667 +45 49 01.63 V T08
2025-11-01 11:23:57 C 04 44 39.634 +47 56 09.20 V T05
2025-11-01 11:29:11 C 04 44 38.582 +47 56 11.80 V T05
2025-11-01 11:36:34 C 04 44 37.073 +47 56 15.29 V T05
2025-11-01 11:45:20 C 04 44 35.287 +47 56 20.00 V T05
2025-11-03 01:05:38 C 04 37 18.281 +48 12 11.56 V R17
2025-11-03 01:25:59 C 04 37 14.076 +48 12 19.84 V R17
2025-11-03 01:46:22 C 04 37 09.816 +48 12 28.12 V R17
2025-11-03 02:06:44 C 04 37 05.532 +48 12 36.14 V R17
2025-11-05 21:10:02 B 04 23 24.547 +48 31 52.57 W L47
2025-11-05 21:12:54 B 04 23 23.777 +48 31 54.19 W L47
2025-11-05 21:15:46 B 04 23 23.155 +48 31 55.56 W L47
2025-11-05 21:21:35 B 04 23 22.375 +48 31 56.46 W L47
2025-11-05 21:24:27 B 04 23 21.523 +48 31 56.32 W L47
2025-11-06 00:57:27 C 04 22 36.442 +48 32 48.26 V R17
2025-11-06 01:17:50 C 04 22 31.930 +48 32 52.66 V R17
2025-11-06 01:38:12 C 04 22 27.463 +48 32 56.90 V R17
2025-11-06 01:58:34 C 04 22 22.994 +48 33 00.72 V R17
2025-11-09 00:26:37 C 04 07 25.738 +48 39 03.06 V R17
2025-11-09 00:46:14 C 04 07 21.343 +48 39 03.06 V R17
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)