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
2024-01-28 09:33:05 C 04 54 43.250 +43 07 32.52 V T05
2024-01-28 09:37:40 C 04 54 42.895 +43 07 28.06 V T05
2024-01-28 09:45:44 C 04 54 42.353 +43 07 21.61 V T05
2024-01-28 10:00:51 C 04 54 41.340 +43 07 07.07 V T05
2024-02-01 08:27:13 C 04 49 32.575 +41 45 36.83 V T05
2024-02-01 08:31:48 C 04 49 32.436 +41 45 33.26 V T05
2024-02-01 08:41:13 C 04 49 31.922 +41 45 24.77 V T05
2024-02-01 09:15:37 C 04 49 30.170 +41 44 54.17 V T05
2024-02-09 08:29:17 C 04 44 37.646 +39 08 39.70 V T05
2024-02-09 08:34:01 C 04 44 37.524 +39 08 37.36 V T05
2024-02-09 08:41:52 C 04 44 37.428 +39 08 30.08 V T05
2024-02-09 08:57:38 C 04 44 37.246 +39 08 17.48 V T05
2024-09-30 10:41:40 C 06 29 56.396 +34 00 12.42 V G96
2024-09-30 10:51:04 C 06 29 56.958 +34 00 17.10 V G96
2024-09-30 10:58:40 C 06 29 57.397 +34 00 21.17 V G96
2024-09-30 11:06:17 C 06 29 57.833 +34 00 25.02 V G96
2024-10-13 09:12:35 C 06 45 47.354 +36 43 49.76 V G96
2024-10-13 09:20:08 C 06 45 47.632 +36 43 54.19 V G96
2024-10-13 09:27:40 C 06 45 47.909 +36 43 58.66 V G96
2024-10-13 09:35:12 C 06 45 48.175 +36 44 03.05 V G96
2024-10-14 11:09:09 C 06 46 45.840 +36 58 39.40 V G96
2024-10-14 11:16:44 C 06 46 46.078 +36 58 43.82 V G96
2024-10-14 11:24:18 C 06 46 46.315 +36 58 48.22 V G96
2024-10-14 11:31:53 C 06 46 46.592 +36 58 52.82 V G96
2024-10-25 11:23:52 C 06 52 45.304 +39 42 47.05 V G96
2024-10-25 11:32:55 C 06 52 45.361 +39 42 54.83 V G96
2024-10-25 11:51:27 C 06 52 45.415 +39 43 05.99 V G96
2024-11-02 23:45:55 C 06 50 52.289 +42 08 05.53 W M01
2024-11-03 01:24:33 C 06 50 49.094 +42 09 20.17 W M01
2024-11-03 02:17:22 C 06 50 47.302 +42 09 59.58 W M01
2024-11-03 21:59:16 C 06 50 14.238 +42 24 42.87 W M01
2024-11-03 22:52:30 C 06 50 12.330 +42 25 24.74 W M01
2024-11-04 00:44:47 C 06 50 08.222 +42 26 52.31 W M01
2024-11-09 09:53:33 C 06 44 22.198 +44 05 48.88 V T05
2024-11-09 10:47:14 C 06 44 18.941 +44 06 32.18 V T05
2024-11-09 10:48:32 C 06 44 18.847 +44 06 33.34 V T05
2024-11-09 11:05:53 C 06 44 17.731 +44 06 47.48 V T05
2024-11-09 11:07:11 C 06 44 17.678 +44 06 48.28 V T05
2024-11-09 11:09:48 C 06 44 17.460 +44 06 50.54 V T05
2024-11-09 11:40:08 C 06 44 15.583 +44 07 15.13 V T05
2024-11-10 07:46:57 C 06 43 01.632 +44 22 44.65 V 703
2024-11-10 07:50:22 C 06 43 01.322 +44 22 46.96 V 703
2024-11-10 07:53:46 C 06 43 01.135 +44 22 50.74 V 703
2024-11-10 07:57:11 C 06 43 00.764 +44 22 52.46 V 703
2024-11-11 11:17:35 C 06 41 10.000 +44 44 04.67 V G96
2024-11-11 11:25:06 C 06 41 09.460 +44 44 10.50 V G96
2024-11-11 11:32:36 C 06 41 08.884 +44 44 16.12 V G96
2024-11-11 11:40:06 C 06 41 08.308 +44 44 21.91 V G96
2024-11-12 09:07:39 C 06 39 35.622 +45 00 54.40 V 703
2024-11-12 09:11:34 C 06 39 35.370 +45 00 59.00 V 703
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)