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
2023-01-06 00:39:41 C 09 19 25.53 +42 05 41.8 V 130
2023-01-06 00:42:33 C 09 19 25.29 +42 05 44.3 V 130
2023-01-13 05:58:55 C 08 59 09.640 +44 42 05.76 V 703
2023-01-13 06:06:48 C 08 59 08.448 +44 42 12.89 V 703
2023-01-13 06:14:41 C 08 59 07.271 +44 42 20.12 V 703
2023-01-13 06:22:34 C 08 59 06.061 +44 42 27.07 V 703
2023-01-15 10:19:26 C 08 51 10.037 +45 26 21.34 V T05
2023-01-15 10:22:02 C 08 51 09.619 +45 26 23.46 V T05
2023-01-15 10:56:22 C 08 51 03.718 +45 26 51.97 V T05
2023-01-15 11:05:33 C 08 51 02.150 +45 26 59.71 V T05
2023-01-15 11:17:23 C 08 51 00.110 +45 27 09.54 V T05
2023-01-15 11:20:00 C 08 50 59.671 +45 27 11.66 V T05
2023-01-15 11:49:11 C 08 50 54.653 +45 27 35.50 V T05
2023-01-19 11:36:14 C 08 34 00.127 +46 39 01.19 V T05
2023-01-19 11:41:26 C 08 33 59.076 +46 39 04.50 V T05
2023-01-19 11:49:57 C 08 33 57.350 +46 39 09.94 V T05
2023-01-19 12:12:11 C 08 33 52.858 +46 39 24.44 V T05
2023-01-19 13:57:07 C 08 33 35.00 +46 40 24.7 V D29
2023-01-19 14:17:29 C 08 33 30.94 +46 40 39.0 V D29
2023-01-19 14:37:51 C 08 33 26.86 +46 40 53.4 V D29
2023-01-23 07:37:59 C 08 15 16.805 +47 30 49.14 V 703
2023-01-23 07:45:22 C 08 15 15.134 +47 30 52.85 V 703
2023-01-23 07:53:01 C 08 15 13.403 +47 30 56.27 V 703
2023-01-23 09:36:23 C 08 14 52.078 +47 31 47.78 V T05
2023-01-23 09:40:19 C 08 14 51.185 +47 31 49.48 V T05
2023-01-23 09:44:18 C 08 14 50.258 +47 31 51.46 V T05
2023-01-23 10:24:45 C 08 14 41.095 +47 32 09.78 V T05
2023-01-24 09:00:45 C 08 09 46.725 +47 41 30.18 U F52
2023-01-24 09:18:05 C 08 09 42.723 +47 41 37.28 U F52
2023-01-24 09:35:28 C 08 09 38.693 +47 41 44.26 U F52
2023-01-24 09:52:51 C 08 09 34.669 +47 41 51.09 U F52
2023-01-26 23:07:49 C 07 55 46.70 +47 59 30.1 X K19
2023-01-26 23:13:07 C 07 55 45.43 +47 59 31.2 X K19
2023-01-26 23:18:24 C 07 55 44.16 +47 59 32.2 X K19
2023-01-27 05:14:00 C 07 54 23.555 +48 00 43.74 V 703
2023-01-27 05:21:39 C 07 54 21.712 +48 00 45.43 V 703
2023-01-27 05:29:18 C 07 54 19.868 +48 00 46.94 V 703
2023-01-27 05:36:59 C 07 54 18.036 +48 00 48.56 V 703
2023-01-29 19:01:36 C 07 40 01.43 +48 05 35.8 V M26
2023-01-29 19:09:04 C 07 39 59.61 +48 05 36.2 V M26
2023-01-29 19:16:33 C 07 39 57.79 +48 05 38.0 V M26
2023-01-30 04:04:56 C 07 37 53.731 +48 05 27.10 V 703
2023-01-30 04:12:43 C 07 37 51.870 +48 05 27.56 V 703
2023-01-30 04:20:30 C 07 37 49.976 +48 05 27.13 V 703
2023-01-30 04:28:17 C 07 37 48.076 +48 05 27.35 V 703
2023-02-03 23:25:10 C 07 11 05.35 +47 38 18.0 V J27
2023-02-03 23:37:13 C 07 11 02.48 +47 38 12.6 V J27
2023-02-03 23:53:11 C 07 10 58.72 +47 38 05.6 V J27
2023-02-04 19:56:30 C 07 06 29.004 +47 28 58.30 X K74
2023-02-04 19:59:32 C 07 06 28.318 +47 28 57.18 X K74
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)