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
2003-01-14 08:51:38 C 08 10 42.79 +47 31 32.3 c 704
2003-01-15 19:01:58 C 08 04 07.80 +47 49 06.1 c 151
2003-01-15 19:04:47 C 08 04 07.11 +47 49 07.4 c 151
2003-01-15 19:15:31 C 08 04 05.13 +47 49 15.4 c 151
2003-01-21 05:42:49 C 07 36 48.91 +48 31 01.1 18.3 c 704
2003-01-21 06:03:50 C 07 36 44.15 +48 31 04.6 18.5 c 704
2003-01-21 06:24:48 C 07 36 39.33 +48 31 07.0 18.6 c 704
2003-01-21 07:06:50 C 07 36 29.88 +48 31 12.4 18.5 c 704
2003-01-27 21:23:22 C 07 01 57.37 +48 15 54.0 d 170
2003-01-27 21:24:17 C 07 01 57.14 +48 15 53.8 d 170
2003-01-27 21:25:14 C 07 01 56.87 +48 15 53.7 d 170
2003-01-27 21:27:08 C 07 01 56.49 +48 15 53.0 d 170
2003-01-27 21:28:05 C 07 01 56.23 +48 15 52.7 d 170
2003-01-29 02:05:53 C 06 55 52.44 +48 05 13.7 i 726
2003-01-29 02:10:52 C 06 55 51.51 +48 05 12.0 i 726
2003-01-29 06:10:24 C 06 55 00.12 +48 03 40.2 c 670
2003-01-29 06:22:44 C 06 54 57.39 +48 03 35.3 c 670
2003-01-31 05:26:00 C 06 45 18.03 +47 40 51.9 17.7 c 644
2003-01-31 05:27:43 C 06 45 17.59 +47 40 50.9 17.5 c 644
2003-01-31 05:55:29 C 06 45 11.80 +47 40 36.0 17.4 c 644
2003-01-31 05:57:13 C 06 45 11.38 +47 40 34.8 17.3 c 644
2003-01-31 06:25:40 C 06 45 05.42 +47 40 19.3 17.5 c 644
2003-01-31 06:27:25 C 06 45 05.03 +47 40 18.0 17.4 c 644
2003-02-01 21:20:11 C 06 37 26.82 +47 17 04.8 c 113
2003-02-01 21:21:46 C 06 37 26.46 +47 17 03.4 c 113
2003-02-01 21:23:21 C 06 37 26.16 +47 17 02.2 c 113
2003-02-01 21:24:55 C 06 37 25.90 +47 17 01.5 c 113
2003-02-01 21:26:32 C 06 37 25.59 +47 17 00.4 c 113
2003-02-01 22:20:00 C 06 37 14.86 +47 16 27.3 c 130
2003-02-01 22:32:00 C 06 37 12.48 +47 16 20.1 c 130
2003-02-01 22:39:30 C 06 37 10.97 +47 16 15.0 c 130
2003-02-01 22:45:59 C 06 37 09.68 +47 16 10.6 c 130
2003-02-07 18:49:25 C 06 12 53.32 +45 26 54.6 d 170
2003-02-07 18:50:44 C 06 12 53.05 +45 26 53.9 d 170
2003-02-07 18:52:06 C 06 12 52.68 +45 26 52.5 d 170
2003-02-07 18:54:45 C 06 12 52.33 +45 26 50.7 d 170
2003-02-09 20:12:20 C 06 05 37.11 +44 41 05.1 c 198
2003-02-09 20:23:58 C 06 05 35.39 +44 40 54.0 c 198
2003-02-09 20:35:36 C 06 05 33.67 +44 40 42.9 c 198
2003-02-09 20:44:24 C 06 05 32.28 +44 40 34.2 c 198
2003-02-12 18:08:16 C 05 56 34.10 +43 31 58.3 c 113
2003-02-12 18:10:13 C 05 56 33.85 +43 31 56.1 c 113
2003-02-12 18:12:10 C 05 56 33.60 +43 31 54.4 c 113
2003-02-12 18:13:45 C 05 56 33.38 +43 31 52.6 c 113
2003-02-12 18:15:22 C 05 56 33.19 +43 31 50.8 c 113
2003-02-19 18:25:45 C 05 40 12.73 +40 35 00.4 c 240
2003-02-19 18:29:23 C 05 40 12.43 +40 34 56.8 c 240
2003-02-19 18:33:01 C 05 40 12.12 +40 34 53.0 c 240
2003-02-19 18:39:04 C 05 40 11.64 +40 34 46.2 c 240
2003-02-19 18:44:41 C 05 40 11.17 +40 34 40.0 c 240
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)