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
2023-12-11 07:55:41 C 07 47 19.640 +45 37 02.21 V G96
2023-12-11 08:03:11 C 07 47 18.856 +45 37 08.11 V G96
2023-12-11 08:10:40 C 07 47 18.078 +45 37 14.09 V G96
2023-12-13 09:55:10 C 07 42 04.334 +46 15 01.40 V T05
2023-12-13 09:57:46 C 07 42 04.118 +46 15 04.32 V T05
2023-12-13 10:01:47 C 07 42 03.636 +46 15 06.73 V T05
2023-12-13 10:51:12 C 07 41 57.811 +46 15 45.00 V T05
2023-12-13 13:33:41 C 07 41 38.244 +46 17 47.94 V T08
2023-12-13 13:37:51 C 07 41 37.795 +46 17 51.29 V T08
2023-12-13 14:34:24 C 07 41 30.974 +46 18 32.08 V T08
2023-12-13 14:53:39 C 07 41 28.637 +46 18 45.90 V T08
2023-12-14 06:59:57 C 07 39 39.262 +46 30 37.08 V 703
2023-12-14 07:03:02 C 07 39 38.826 +46 30 39.35 V 703
2023-12-14 07:06:06 C 07 39 38.383 +46 30 40.90 V 703
2023-12-14 07:09:11 C 07 39 38.034 +46 30 43.63 V 703
2023-12-15 10:19:47 C 07 36 20.563 +46 50 31.99 V T08
2023-12-15 10:22:27 C 07 36 20.177 +46 50 34.62 V T08
2023-12-15 10:26:31 C 07 36 19.649 +46 50 37.72 V T08
2023-12-15 10:49:27 C 07 36 16.620 +46 50 54.28 V T08
2023-12-16 06:34:08 C 07 33 45.947 +47 04 46.96 V 703
2023-12-16 06:37:14 C 07 33 45.414 +47 04 48.47 V 703
2023-12-16 06:40:21 C 07 33 45.022 +47 04 50.92 V 703
2023-12-16 06:43:28 C 07 33 44.676 +47 04 53.54 V 703
2023-12-17 12:39:13 C 07 29 42.713 +47 25 28.74 V T05
2023-12-17 12:45:08 C 07 29 41.815 +47 25 32.95 V T05
2023-12-17 13:34:55 C 07 29 34.579 +47 26 05.86 V T05
2023-12-17 14:16:39 C 07 29 28.462 +47 26 32.53 V T05
2023-12-18 06:43:41 C 07 27 11.776 +47 37 18.26 V 703
2023-12-18 06:46:48 C 07 27 11.164 +47 37 21.00 V 703
2023-12-18 06:49:54 C 07 27 10.890 +47 37 23.02 V 703
2023-12-18 06:53:02 C 07 27 10.357 +47 37 25.32 V 703
2023-12-25 09:50:13 C 06 59 22.970 +49 07 06.06 V T05
2023-12-25 09:54:08 C 06 59 22.265 +49 07 07.32 V T05
2023-12-25 10:00:00 C 06 59 21.144 +49 07 09.84 V T05
2023-12-25 10:07:49 C 06 59 19.608 +49 07 12.65 V T05
2023-12-28 08:01:45 S 06 47 37.846 +49 40 25.79 V C57
2023-12-28 08:01:45 s 1 +165723.99 4 +283216.27 9250.0 C57
2023-12-28 08:21:45 S 06 47 33.350 +49 40 28.49 V C57
2023-12-28 08:21:45 s 1 +165104.56 1 +283555.44 1660.0 C57
2023-12-28 08:41:45 S 06 47 29.474 +49 40 35.04 V C57
2023-12-28 08:41:45 s 1 +164482.53 6 +283890.20 4300.0 C57
2023-12-28 09:01:44 S 06 47 25.157 +49 40 34.93 V C57
2023-12-28 09:01:44 s 1 +163857.92 1 +284220.53 7260.0 C57
2023-12-28 11:21:45 S 06 46 57.257 +49 40 56.96 V C57
2023-12-28 11:21:45 s 1 +159414.11 0 +286408.88 7270.0 C57
2023-12-28 11:41:45 S 06 46 53.654 +49 41 10.82 V C57
2023-12-28 11:41:45 s 1 +158769.12 5 +286703.62 6890.0 C57
2023-12-28 12:01:44 S 06 46 48.878 +49 41 11.72 V C57
2023-12-28 12:01:44 s 1 +158121.60 4 +286993.83 7730.0 C57
2023-12-28 12:21:44 S 06 46 44.784 +49 41 16.80 V C57
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)