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
2007-11-08 02:38:27 C 21 01 22.53 -06 57 46.0 19.3 c 704
2007-11-08 02:56:17 C 21 01 26.48 -06 57 20.0 19.1 c 704
2007-11-09 01:32:07 C 21 06 30.37 -06 25 04.3 19.0 c 704
2007-11-09 01:49:54 C 21 06 34.27 -06 24 38.3 19.3 c 704
2007-11-09 02:07:42 C 21 06 38.08 -06 24 13.7 18.9 c 704
2007-11-09 02:25:39 C 21 06 42.00 -06 23 47.8 19.3 c 704
2007-11-09 02:43:27 C 21 06 45.81 -06 23 23.1 19.0 c 704
2007-11-12 01:31:22 C 21 21 55.30 -04 45 39.4 19.1 c 704
2007-11-12 02:07:39 C 21 22 02.67 -04 44 49.5 19.8 c 704
2007-11-12 02:25:45 C 21 22 06.38 -04 44 26.1 19.8 c 704
2007-11-12 02:43:51 C 21 22 09.97 -04 44 01.2 19.9 c 704
2007-11-15 02:24:27 C 21 36 31.10 -03 10 26.7 r 703
2007-11-15 02:33:44 C 21 36 32.86 -03 10 13.9 r 703
2007-11-15 02:43:02 C 21 36 34.52 -03 10 01.8 r 703
2007-11-15 02:52:16 C 21 36 36.36 -03 09 50.8 r 703
2007-11-17 01:40:23 C 21 45 29.85 -02 11 39.0 18.6 c 704
2007-11-17 02:16:17 C 21 45 36.38 -02 10 53.7 19.2 c 704
2007-11-17 02:34:25 C 21 45 39.74 -02 10 32.6 18.8 c 704
2007-11-17 02:52:23 C 21 45 43.03 -02 10 10.7 18.7 c 704
2007-12-02 03:24:38 C 22 44 17.39 +04 09 00.4 19.5 c 704
2007-12-02 03:43:05 C 22 44 19.98 +04 09 17.6 19.8 c 704
2007-12-02 04:01:33 C 22 44 22.54 +04 09 31.9 19.8 c 704
2007-12-02 04:21:00 C 22 44 25.29 +04 09 51.1 19.2 c 704
2007-12-03 01:20:16 C 22 47 25.51 +04 28 41.4 19.7 c 704
2007-12-03 01:38:53 C 22 47 28.03 +04 28 56.8 20.2 c 704
2007-12-03 02:16:05 C 22 47 33.19 +04 29 30.2 20.0 c 704
2007-12-03 02:34:42 C 22 47 35.80 +04 29 47.8 19.9 c 704
2007-12-31 02:26:02 C 00 10 45.87 +12 38 31.8 r 703
2007-12-31 02:35:29 C 00 10 46.95 +12 38 36.3 r 703
2007-12-31 02:44:55 C 00 10 48.03 +12 38 43.4 r 703
2007-12-31 02:54:21 C 00 10 49.08 +12 38 50.2 r 703
2009-12-19 01:47:10 C 22 05 59.49 -07 18 55.6 r G96
2009-12-19 01:53:51 C 22 06 00.57 -07 18 48.3 r G96
2009-12-19 02:00:34 C 22 06 01.72 -07 18 39.6 r G96
2009-12-19 02:07:17 C 22 06 02.84 -07 18 32.8 r G96
2011-01-14 01:51:15 C 23 01 59.59 -02 11 49.2 r G96
2011-01-14 01:57:58 C 23 02 00.60 -02 11 41.8 r G96
2011-01-14 02:04:36 C 23 02 01.60 -02 11 34.2 r G96
2011-01-14 02:11:12 C 23 02 02.58 -02 11 26.9 r G96
2017-11-17 14:57:59 C 12 15 31.520 +02 13 33.04 L F51
2017-11-17 15:05:24 C 12 15 32.564 +02 13 24.89 L F51
2017-11-17 15:12:48 C 12 15 33.629 +02 13 16.88 L F51
2019-11-05 14:32:28 C 10 31 31.278 +17 12 52.07 U F51
2019-11-05 14:38:55 C 10 31 32.041 +17 12 48.01 U F51
2019-11-05 14:45:22 C 10 31 32.766 +17 12 43.93 U F51
2019-11-05 14:51:49 C 10 31 33.515 +17 12 39.74 U F51
2020-01-24 12:59:33 C 15 25 36.76 -16 33 38.1 V G96
2020-01-24 13:05:03 C 15 25 38.03 -16 33 45.2 V G96
2020-01-24 13:10:31 C 15 25 39.31 -16 33 52.7 V G96
2020-01-24 13:15:59 C 15 25 40.59 -16 34 00.1 V G96
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)