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
2025-11-09 01:05:51 C 04 07 16.939 +48 39 03.13 V R17
2025-11-09 01:25:36 C 04 07 12.480 +48 39 03.02 V R17
2025-11-09 19:34:45 C 04 03 19.963 +48 37 55.02 Z C23
2025-11-09 20:31:19 C 04 03 07.586 +48 37 53.62 Z C23
2025-11-09 22:14:38 C 04 02 44.945 +48 37 49.80 Z C23
2025-11-10 10:21:21 C 04 00 08.390 +48 36 55.12 V T08
2025-11-10 10:25:18 C 04 00 07.459 +48 36 54.50 V T08
2025-11-10 11:13:28 C 03 59 56.616 +48 36 49.14 V T08
2025-11-11 09:39:35 C 03 55 08.686 +48 33 26.06 V T08
2025-11-11 09:48:50 C 03 55 06.619 +48 33 24.48 V T08
2025-11-11 10:05:26 C 03 55 02.870 +48 33 21.89 V T08
2025-11-17 20:08:31 C 03 23 11.818 +47 31 57.97 Z C23
2025-11-17 20:35:17 C 03 23 06.499 +47 31 43.54 Z C23
2025-11-21 19:59:12 C 03 05 31.231 +46 25 23.74 Z C23
2025-11-21 21:17:18 C 03 05 17.275 +46 24 24.59 Z C23
2025-11-25 09:24:34 C 02 51 44.954 +45 13 16.14 V T05
2025-11-25 09:38:24 C 02 51 42.749 +45 13 03.76 V T05
2025-11-25 09:54:16 C 02 51 40.236 +45 12 49.14 V T05
2025-11-26 09:03:15 C 02 48 18.617 +44 51 42.01 V T08
2025-11-26 09:11:08 C 02 48 17.426 +44 51 34.74 V T08
2025-11-26 09:15:45 C 02 48 16.718 +44 51 30.24 V T08
2025-11-26 09:30:52 C 02 48 14.417 +44 51 16.45 V T08
2025-11-26 17:29:04 C 02 47 08.770 +44 43 33.74 Z C23
2025-11-26 18:28:49 C 02 47 00.233 +44 42 40.07 Z C23
2025-11-27 04:44:33 C 02 45 34.733 +44 33 15.62 V G96
2025-11-27 04:51:57 C 02 45 33.656 +44 33 08.71 V G96
2025-11-27 04:59:22 C 02 45 32.591 +44 33 01.84 V G96
2025-11-27 05:06:56 C 02 45 31.496 +44 32 54.74 V G96
2025-11-28 09:04:49 C 02 41 49.128 +44 06 26.50 V T08
2025-11-28 09:09:26 C 02 41 48.482 +44 06 21.89 V T08
2025-11-28 09:17:59 C 02 41 47.328 +44 06 13.46 V T08
2025-11-28 09:35:05 C 02 41 44.983 +44 05 57.12 V T08
2025-11-28 13:04:38 C 02 41 19.37 +44 02 30.5 V D29
2025-11-28 13:25:00 C 02 41 16.64 +44 02 11.4 V D29
2025-11-28 13:45:22 C 02 41 13.91 +44 01 52.1 V D29
2025-11-29 07:13:56 C 02 39 04.037 +43 45 03.67 X F51
2025-11-29 07:31:20 C 02 39 01.777 +43 44 47.16 X F51
2025-11-29 07:48:46 C 02 38 59.501 +43 44 30.46 X F51
2025-11-29 08:06:19 C 02 38 57.222 +43 44 13.62 X F51
2025-11-29 09:41:21 C 02 38 44.854 +43 42 41.36 V T08
2025-11-29 09:45:57 C 02 38 44.249 +43 42 36.76 V T08
2025-11-29 09:55:49 C 02 38 43.003 +43 42 26.75 V T08
2025-11-29 10:15:34 C 02 38 40.447 +43 42 06.91 V T08
2025-11-29 22:11:05 C 02 37 16.548 +43 30 29.02 V R17
2025-11-29 22:31:27 C 02 37 14.009 +43 30 08.93 V R17
2025-11-29 22:51:50 C 02 37 11.460 +43 29 49.27 V R17
2025-11-29 23:12:12 C 02 37 08.911 +43 29 29.47 V R17
2025-11-30 03:44:48 C 02 36 38.020 +43 25 01.50 V 703
2025-11-30 03:48:20 C 02 36 37.470 +43 24 56.70 V 703
2025-11-30 03:51:51 C 02 36 37.030 +43 24 54.40 V 703
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)