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
2024-01-02 20:05:04 S 06 20 08.117 +49 30 40.10 V C57
2024-01-02 20:05:04 s 1 -95892.153 0 -76913.779 9040.0 C57
2024-01-02 20:25:04 S 06 20 04.922 +49 30 34.74 V C57
2024-01-02 20:25:04 s 1 -95122.351 0 -78735.460 3350.0 C57
2024-01-02 20:45:04 S 06 20 00.588 +49 30 31.79 V C57
2024-01-02 20:45:04 s 1 -94332.329 0 -80540.372 810.0 C57
2024-01-02 21:05:04 S 06 19 57.209 +49 30 25.56 V C57
2024-01-02 21:05:04 s 1 -93522.256 0 -82328.137 4430.0 C57
2024-01-02 21:25:04 S 06 19 53.527 +49 30 23.04 V C57
2024-01-02 21:25:04 s 1 -92692.096 0 -84098.189 5830.0 C57
2024-01-02 21:45:04 S 06 19 49.668 +49 30 19.19 V C57
2024-01-02 21:45:04 s 1 -91842.059 0 -85850.176 8320.0 C57
2024-01-02 22:05:04 S 06 19 45.605 +49 30 17.89 V C57
2024-01-02 22:05:04 s 1 -90972.346 0 -87583.743 5120.0 C57
2024-01-02 22:25:04 S 06 19 41.897 +49 30 13.00 V C57
2024-01-02 22:25:04 s 1 -90082.953 0 -89298.335 8150.0 C57
2024-01-02 22:45:04 S 06 19 38.669 +49 30 04.28 V C57
2024-01-02 22:45:04 s 1 -89174.121 0 -90993.626 910.0 C57
2024-01-02 23:25:04 S 06 19 31.968 +49 30 03.64 V C57
2024-01-02 23:25:04 s 1 -87298.857 0 -94324.780 7970.0 C57
2024-01-03 00:25:04 S 06 19 20.837 +49 29 46.32 V C57
2024-01-03 00:25:04 s 1 -84344.555 0 -99167.062 8500.0 C57
2024-01-03 00:45:04 S 06 19 16.822 +49 29 47.90 V C57
2024-01-03 00:45:04 s 1 -83322.877 0 -100738.50 4930.0 C57
2024-01-03 01:05:04 S 06 19 13.798 +49 29 45.20 V C57
2024-01-03 01:05:04 s 1 -82283.183 0 -102288.14 3810.0 C57
2024-01-03 01:25:04 S 06 19 10.104 +49 29 47.04 V C57
2024-01-03 01:25:04 s 1 -81225.570 0 -103815.48 7810.0 C57
2024-01-04 10:14:41 C 06 13 17.986 +49 30 30.78 V T08
2024-01-04 10:18:45 C 06 13 17.191 +49 30 29.74 V T08
2024-01-04 10:26:27 C 06 13 15.629 +49 30 28.30 V T08
2024-01-06 09:34:04 C 06 04 14.472 +49 18 37.26 V T05
2024-01-06 09:39:40 C 06 04 13.330 +49 18 35.39 V T05
2024-01-06 09:48:48 C 06 04 11.554 +49 18 32.62 V T05
2024-01-06 10:07:31 C 06 04 07.831 +49 18 26.78 V T05
2024-01-08 11:14:39 C 05 54 59.527 +49 00 32.29 V T08
2024-01-08 11:19:40 C 05 54 58.570 +49 00 29.92 V T08
2024-01-08 11:28:01 C 05 54 56.976 +49 00 26.32 V T08
2024-01-08 11:50:54 C 05 54 52.658 +49 00 15.77 V T08
2024-01-11 06:32:27 C 05 43 08.951 +48 27 43.63 V 703
2024-01-11 06:35:43 C 05 43 08.353 +48 27 40.64 V 703
2024-01-11 06:38:59 C 05 43 07.838 +48 27 39.35 V 703
2024-01-11 06:42:14 C 05 43 07.280 +48 27 37.01 V 703
2024-01-16 08:53:03 C 05 24 09.187 +47 08 06.29 V T08
2024-01-16 09:02:33 C 05 24 07.778 +47 07 59.48 V T08
2024-01-16 09:20:48 C 05 24 05.042 +47 07 45.30 V T08
2024-01-19 07:52:25 C 05 14 53.314 +46 13 16.14 V T08
2024-01-19 07:57:05 C 05 14 52.750 +46 13 12.36 V T08
2024-01-19 08:05:03 C 05 14 51.742 +46 13 05.84 V T08
2024-01-19 08:24:24 C 05 14 49.210 +46 12 50.29 V T08
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)