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
2004-12-15 20:35:34 C 03 58 46.59 +46 56 23.3 r A16
2004-12-15 20:42:00 C 03 58 45.52 +46 56 17.7 r A16
2004-12-16 08:25:26 C 03 57 03.52 +46 47 28.6 19.0 c 704
2004-12-16 08:44:13 C 03 57 00.82 +46 47 13.4 18.6 c 704
2004-12-16 09:02:57 C 03 56 58.04 +46 46 58.5 18.9 c 704
2004-12-16 09:21:43 C 03 56 55.31 +46 46 43.2 18.9 c 704
2004-12-19 05:57:22 C 03 47 51.38 +45 52 15.2 r H41
2004-12-19 05:59:58 C 03 47 51.14 +45 52 12.2 r H41
2004-12-19 06:02:24 C 03 47 50.67 +45 52 10.6 r H41
2004-12-21 21:15:33 C 03 40 34.48 +44 58 55.8 c A53
2004-12-21 21:20:49 C 03 40 33.90 +44 58 51.0 c A53
2004-12-21 21:26:37 C 03 40 33.26 +44 58 46.6 c A53
2005-01-07 19:40:15 C 03 16 27.55 +39 19 28.9 r A30
2005-01-07 19:44:27 C 03 16 27.47 +39 19 25.4 r A30
2005-01-07 19:45:02 C 03 16 27.46 +39 19 24.8 r A30
2005-01-17 03:31:28 C 03 16 19.35 +36 50 11.9 19.9 c 704
2005-01-17 03:50:55 C 03 16 19.43 +36 50 00.0 20.0 c 704
2005-01-17 04:09:08 C 03 16 19.61 +36 49 49.2 19.6 c 704
2005-01-17 04:27:20 C 03 16 19.80 +36 49 37.9 19.4 c 704
2005-01-17 04:45:32 C 03 16 19.98 +36 49 27.9 19.6 c 704
2005-09-14 10:11:58 C 06 11 41.30 +30 09 00.0 19.0 c 704
2005-09-14 10:29:56 C 06 11 40.45 +30 09 21.6 18.8 c 704
2005-09-14 10:47:55 C 06 11 39.58 +30 09 44.1 18.9 c 704
2005-09-14 11:05:51 C 06 11 38.64 +30 10 05.8 20.1 c 704
2005-09-14 11:23:48 C 06 11 37.90 +30 10 27.8 19.3 c 704
2005-10-11 07:29:03 C 05 28 26.50 +42 35 47.3 o H06
2005-10-11 07:38:12 C 05 28 25.40 +42 35 56.3 o H06
2005-10-11 07:47:28 C 05 28 24.10 +42 36 07.5 o H06
2005-10-11 07:58:21 C 05 28 22.77 +42 36 19.6 o H06
2005-10-13 22:07:07 C 05 20 18.31 +43 41 38.1 o 198
2005-10-13 22:07:54 C 05 20 18.20 +43 41 39.0 o 198
2005-10-13 22:08:41 C 05 20 18.09 +43 41 39.9 o 198
2005-10-13 22:11:00 C 05 20 17.76 +43 41 42.6 o 198
2005-10-24 16:10:43 C 04 35 36.48 +47 17 03.8 m 379
2005-10-24 16:13:35 C 04 35 35.91 +47 17 05.9 m 379
2005-10-24 16:16:27 C 04 35 35.42 +47 17 09.0 m 379
2005-10-24 16:22:12 C 04 35 34.09 +47 17 11.3 m 379
2005-10-27 20:04:08 C 04 19 21.36 +47 52 24.8 r 084
2005-10-29 18:13:40 C 04 08 59.80 +48 05 47.2 r 084
2005-10-29 18:18:20 C 04 08 58.76 +48 05 48.8 r 084
2005-10-30 16:05:32 C 04 04 00.40 +48 09 45.8 c A50
2005-10-30 16:06:36 C 04 04 00.13 +48 09 45.9 c A50
2005-10-30 16:07:39 C 04 03 59.91 +48 09 46.1 c A50
2005-10-30 16:08:43 C 04 03 59.63 +48 09 46.4 c A50
2005-10-30 16:09:46 C 04 03 59.39 +48 09 46.6 c A50
2005-10-31 17:52:32 C 03 58 03.68 +48 12 39.4 r 084
2005-10-31 17:57:12 C 03 58 02.59 +48 12 39.9 r 084
2005-11-01 15:26:02 C 03 53 03.04 +48 13 44.7 m 379
2005-11-01 15:31:46 C 03 53 01.60 +48 13 45.3 m 379
2005-11-01 17:07:52 C 03 52 40.58 +48 13 19.5 r 084
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)