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
2005-11-03 21:51:33 C 03 40 26.78 +48 08 40.7 i 071
2005-11-03 21:55:01 C 03 40 25.97 +48 08 40.3 i 071
2005-11-03 21:58:14 C 03 40 25.22 +48 08 39.7 i 071
2005-11-03 22:08:41 C 03 40 23.32 +48 08 34.7 r A30
2005-11-03 22:09:30 C 03 40 23.12 +48 08 34.7 r A30
2005-11-03 22:10:19 C 03 40 22.92 +48 08 34.7 r A30
2005-11-03 22:11:09 C 03 40 22.72 +48 08 34.6 r A30
2005-11-08 12:14:40 C 03 15 37.18 +47 30 00.2 m 379
2005-11-08 12:35:10 C 03 15 32.51 +47 29 49.9 m 379
2005-11-08 12:45:50 C 03 15 30.16 +47 29 44.9 m 379
2005-11-08 12:48:30 C 03 15 29.52 +47 29 43.7 m 379
2005-11-08 22:20:38 C 03 13 25.32 +47 24 39.0 r A30
2005-11-08 22:21:21 C 03 13 25.16 +47 24 38.7 r A30
2005-11-08 22:22:25 C 03 13 24.92 +47 24 38.1 r A30
2005-11-08 22:23:28 C 03 13 24.69 +47 24 37.5 r A30
2005-11-08 22:24:29 C 03 13 24.46 +47 24 37.0 r A30
2005-11-08 22:25:30 C 03 13 24.24 +47 24 36.4 r A30
2005-11-09 17:34:49 C 03 09 21.15 +47 13 33.6 c 104
2005-11-09 17:53:37 C 03 09 17.28 +47 13 22.5 c 104
2005-11-09 18:00:50 C 03 09 15.59 +47 13 19.9 c 104
2005-11-10 21:15:12 C 03 03 35.08 +46 56 27.2 o A48
2005-11-10 21:17:53 C 03 03 34.50 +46 56 25.4 o A48
2005-11-10 21:20:33 C 03 03 33.93 +46 56 23.6 o A48
2005-11-10 21:23:14 C 03 03 33.37 +46 56 22.1 o A48
2005-11-11 20:06:14 C 02 58 59.04 +46 40 44.7 c 434
2005-11-11 20:10:11 C 02 58 58.30 +46 40 42.7 c 434
2005-11-11 20:12:04 C 02 58 57.75 +46 40 41.5 c 434
2005-11-11 21:43:17 C 02 58 39.03 +46 39 38.9 c A53
2005-11-11 21:48:33 C 02 58 37.97 +46 39 35.9 c A53
2005-11-11 21:50:43 C 02 58 37.51 +46 39 33.9 c A53
2005-11-11 21:59:36 C 02 58 35.64 +46 39 27.7 c A53
2005-11-12 06:36:26 C 02 56 53.32 +46 33 19.1 18.0 c 704
2005-11-12 06:54:39 C 02 56 49.55 +46 33 06.4 18.1 c 704
2005-11-12 07:12:53 C 02 56 45.81 +46 32 52.8 18.1 c 704
2005-11-12 07:31:26 C 02 56 41.97 +46 32 39.7 18.4 c 704
2005-11-19 21:22:22 C 02 25 52.89 +43 51 30.3 18.1 c 565
2005-11-19 21:31:09 C 02 25 51.62 +43 51 21.4 18.2 c 565
2005-11-19 21:35:47 C 02 25 50.94 +43 51 16.6 18.1 c 565
2005-11-22 15:27:45 C 02 17 10.85 +42 44 19.0 r 084
2005-11-22 15:32:25 C 02 17 10.28 +42 44 14.6 r 084
2005-11-22 19:37:45 C 02 16 39.62 +42 40 07.7 r 084
2005-11-23 05:13:16 C 02 15 30.87 +42 30 27.1 18.1 c 704
2005-11-23 05:32:19 C 02 15 28.47 +42 30 07.4 18.3 c 704
2005-11-23 05:50:59 C 02 15 26.12 +42 29 47.5 18.0 c 704
2005-11-23 06:09:31 C 02 15 23.84 +42 29 28.4 18.4 c 704
2005-11-23 06:27:58 C 02 15 21.48 +42 29 09.3 18.4 c 704
2005-11-24 20:28:19 C 02 11 07.57 +41 49 42.0 c A53
2005-11-24 20:46:46 C 02 11 05.42 +41 49 23.4 c A53
2005-11-24 20:59:57 C 02 11 03.91 +41 49 09.1 c A53
2005-11-26 04:45:59 C 02 07 50.40 +41 16 17.2 17.6 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)