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
2003-11-26 09:57:15 C 07 47 38.40 +42 52 41.3 19.4 c 704
2003-11-26 10:15:56 C 07 47 37.42 +42 52 55.1 19.3 c 704
2003-12-04 08:07:00 C 07 35 31.36 +45 17 52.5 18.8 c 704
2003-12-04 08:22:54 C 07 35 29.87 +45 18 07.1 19.1 c 704
2003-12-04 08:39:01 C 07 35 28.49 +45 18 18.0 18.9 c 704
2003-12-04 08:55:21 C 07 35 26.86 +45 18 31.9 18.9 c 704
2003-12-05 07:48:06 C 07 33 24.68 +45 36 00.6 19.1 c 704
2003-12-05 08:06:14 C 07 33 23.00 +45 36 15.0 18.9 c 704
2003-12-05 08:24:17 C 07 33 21.16 +45 36 28.1 18.9 c 704
2003-12-05 08:42:18 C 07 33 19.39 +45 36 42.7 19.3 c 704
2003-12-05 09:00:25 C 07 33 17.52 +45 36 56.2 19.2 c 704
2003-12-15 07:28:29 C 07 03 53.16 +48 21 17.6 18.8 c 704
2003-12-15 07:45:02 C 07 03 50.53 +48 21 27.2 19.0 c 704
2003-12-15 08:02:15 C 07 03 47.78 +48 21 36.9 18.8 c 704
2003-12-15 08:18:56 C 07 03 45.11 +48 21 46.8 19.1 c 704
2003-12-15 23:52:22 C 07 01 20.20 +48 30 19.5 c J92
2003-12-15 23:55:53 C 07 01 19.46 +48 30 22.1 c J92
2003-12-15 23:59:26 C 07 01 18.95 +48 30 24.0 c J92
2003-12-16 01:52:09 C 07 01 00.62 +48 31 25.5 c J92
2003-12-16 01:55:11 C 07 01 00.01 +48 31 27.3 c J92
2003-12-16 01:58:14 C 07 00 59.56 +48 31 29.0 c J92
2003-12-16 02:01:15 C 07 00 59.03 +48 31 30.8 c J92
2003-12-16 02:04:18 C 07 00 58.58 +48 31 32.3 c J92
2003-12-16 02:07:20 C 07 00 58.16 +48 31 33.7 c J92
2003-12-29 18:37:00 C 06 00 44.31 +49 40 49.0 c 151
2003-12-29 18:41:32 C 06 00 43.45 +49 40 47.4 c 151
2003-12-29 18:42:11 C 06 00 43.35 +49 40 47.0 c 151
2004-01-02 05:13:06 C 05 45 08.48 +49 18 55.5 18.7 c 704
2004-01-02 05:31:06 C 05 45 05.03 +49 18 48.9 18.8 c 704
2004-01-02 05:49:04 C 05 45 01.53 +49 18 42.2 18.8 c 704
2004-01-02 06:07:09 C 05 44 58.21 +49 18 36.9 19.0 c 704
2004-01-18 19:42:04 C 04 48 47.96 +44 51 13.7 o 950
2004-01-18 19:47:04 C 04 48 47.45 +44 51 09.1 o 950
2004-01-18 19:50:05 C 04 48 47.18 +44 51 06.7 o 950
2004-01-18 20:00:29 C 04 48 46.08 +44 50 57.7 o 950
2004-01-18 20:09:29 C 04 48 45.33 +44 50 51.3 o 950
2004-01-18 20:17:30 C 04 48 44.44 +44 50 43.8 o 950
2004-01-18 20:30:29 C 04 48 43.27 +44 50 33.8 o 950
2004-01-18 20:43:29 C 04 48 41.88 +44 50 21.9 o 950
2004-01-18 20:50:29 C 04 48 41.29 +44 50 17.1 o 950
2004-01-18 20:57:29 C 04 48 40.56 +44 50 10.8 o 950
2004-01-24 02:52:37 C 04 39 09.72 +43 02 17.8 c 830
2004-01-24 04:13:47 C 04 39 04.57 +43 01 06.6 c 830
2004-01-24 04:46:02 C 04 39 02.40 +43 00 38.5 c 830
2004-02-11 04:20:40 C 04 31 14.54 +37 28 48.6 20.3 c 704
2004-02-11 04:55:28 C 04 31 14.89 +37 28 24.5 20.2 c 704
2004-02-11 05:12:54 C 04 31 15.10 +37 28 12.0 20.4 c 704
2004-10-15 08:48:33 C 06 36 35.62 +37 59 03.9 19.1 c 704
2004-10-15 09:20:27 C 06 36 36.12 +37 59 25.7 19.4 c 704
2004-10-15 09:36:25 C 06 36 36.39 +37 59 37.3 19.6 c 704
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)