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
2022-02-18 02:22:05 C 13 14 13.07 +26 40 08.5 X J57
2022-02-18 02:44:07 C 13 14 17.99 +26 40 23.0 X J57
2022-02-18 03:06:08 C 13 14 22.92 +26 40 37.2 X J57
2022-02-18 03:29:36 C 13 14 28.16 +26 40 52.0 X J57
2022-02-18 03:53:02 C 13 14 33.42 +26 41 06.7 X J57
2022-02-18 04:15:03 C 13 14 38.35 +26 41 20.1 X J57
2022-02-18 04:37:05 C 13 14 43.34 +26 41 33.3 X J57
2022-02-18 04:59:07 C 13 14 48.33 +26 41 46.2 X J57
2022-02-18 05:25:34 C 13 14 54.35 +26 42 01.4 X J57
2022-02-18 21:55:34 C 13 19 16.61 +26 52 23.7 V M24
2022-02-19 00:46:15 C 13 20 00.03 +26 54 31.3 V M24
2022-02-19 18:50:17 C 13 25 12.78 +27 05 57.4 V C40
2022-02-19 19:11:00 C 13 25 19.00 +27 06 14.3 V C40
2022-02-19 19:15:38 C 13 25 20.39 +27 06 17.9 V C40
2022-02-19 19:17:11 C 13 25 20.85 +27 06 19.1 V C40
2022-02-19 19:21:46 C 13 25 22.22 +27 06 22.9 V C40
2022-02-19 19:23:19 C 13 25 22.68 +27 06 24.2 V C40
2022-02-19 19:31:04 C 13 25 24.99 +27 06 30.6 V C40
2022-02-19 19:34:08 C 13 25 25.90 +27 06 33.0 V C40
2022-02-19 19:58:46 C 13 25 33.20 +27 06 52.7 V C40
2022-02-19 20:04:57 C 13 25 35.02 +27 06 57.8 V C40
2022-02-19 20:15:48 C 13 25 38.22 +27 07 06.4 V C40
2022-02-19 20:21:55 C 13 25 40.01 +27 07 11.2 V C40
2022-02-19 20:28:07 C 13 25 41.83 +27 07 16.2 V C40
2022-02-19 20:31:13 C 13 25 42.73 +27 07 18.8 V C40
2022-02-19 20:32:47 C 13 25 43.18 +27 07 19.9 V C40
2022-02-21 03:40:36 C 13 36 03.13 +27 29 06.3 q W64
2022-02-21 03:54:21 C 13 36 08.06 +27 29 18.2 q W64
2022-02-21 04:27:47 C 13 36 19.84 +27 29 47.0 q W64
2022-02-21 04:47:45 V 13 36 26.57 +27 30 02.6 14.8 V 270
2022-02-21 04:47:45 v 1 285.03179 +40.20037 270
2022-02-21 05:00:07 V 13 36 30.96 +27 30 13.1 14.9 V 270
2022-02-21 05:00:07 v 1 285.03179 +40.20037 270
2022-02-21 05:12:30 V 13 36 35.29 +27 30 23.5 15.0 V 270
2022-02-21 05:12:30 v 1 285.03179 +40.20037 270
2022-02-21 05:26:00 V 13 36 39.97 +27 30 35.1 14.9 V 270
2022-02-21 05:26:00 v 1 285.03179 +40.20037 270
2022-02-21 05:34:56 V 13 36 42.60 +27 30 38.4 15.1 V 270
2022-02-21 05:34:56 v 1 288.76646 +42.90374 270
2022-02-21 05:40:33 V 13 36 44.47 +27 30 44.6 14.9 V 270
2022-02-21 05:40:33 v 1 288.76646 +42.90374 270
2022-02-21 05:46:11 V 13 36 46.33 +27 30 51.9 14.7 V 270
2022-02-21 05:46:11 v 1 288.76646 +42.90374 270
2022-02-21 05:51:48 V 13 36 48.26 +27 30 51.2 15.0 V 270
2022-02-21 05:51:48 v 1 288.76646 +42.90374 270
2022-02-21 11:40:23 C 13 38 59.59 +27 35 44.7 V T08
2022-02-21 11:43:00 C 13 39 00.52 +27 35 46.9 V T08
2022-02-21 12:03:56 C 13 39 07.91 +27 36 04.2 V T08
2022-02-21 12:09:51 C 13 39 09.98 +27 36 08.9 V T08
2022-02-22 02:58:43 C 13 45 03.08 +27 46 12.6 X M03
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)