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
2023-12-30 19:21:44 s 1 +21668.572 0 +261662.73 8060.0 C57
2023-12-30 20:01:44 S 06 35 09.689 +49 45 02.38 V C57
2023-12-30 20:01:44 s 1 +19773.661 0 +260299.35 5440.0 C57
2023-12-30 20:21:44 S 06 35 05.004 +49 45 02.23 V C57
2023-12-30 20:21:44 s 1 +18825.291 0 +259606.44 8330.0 C57
2023-12-30 20:41:44 S 06 35 00.900 +49 45 00.54 V C57
2023-12-30 20:41:44 s 1 +17876.338 0 +258905.94 80.0 C57
2023-12-30 21:21:44 S 06 34 51.540 +49 44 56.83 V C57
2023-12-30 21:21:44 s 1 +15976.789 0 +257482.18 9040.0 C57
2023-12-30 21:41:44 S 06 34 47.659 +49 44 57.91 V C57
2023-12-30 21:41:44 s 1 +15026.243 0 +256758.87 5610.0 C57
2023-12-30 22:01:44 S 06 34 44.251 +49 44 57.91 V C57
2023-12-30 22:01:44 s 1 +14075.214 0 +256027.86 9650.0 C57
2023-12-30 22:21:44 S 06 34 39.055 +49 44 55.50 V C57
2023-12-30 22:21:44 s 1 +13123.734 0 +255289.25 1170.0 C57
2023-12-30 22:41:44 S 06 34 35.021 +49 44 43.51 V C57
2023-12-30 22:41:44 s 1 +12171.823 0 +254542.89 9500.0 C57
2023-12-30 23:01:44 S 06 34 31.133 +49 44 52.12 V C57
2023-12-30 23:01:44 s 1 +11219.507 0 +253788.76 4240.0 C57
2023-12-31 01:01:44 S 06 34 05.472 +49 44 44.38 V C57
2023-12-31 01:21:44 S 06 34 01.051 +49 44 35.30 V C57
2023-12-31 01:41:44 S 06 33 55.973 +49 44 43.01 V C57
2023-12-31 02:01:44 S 06 33 52.342 +49 44 28.03 V C57
2023-12-31 02:21:44 S 06 33 47.585 +49 44 30.88 V C57
2023-12-31 02:41:44 S 06 33 42.946 +49 44 34.04 V C57
2023-12-31 03:01:44 S 06 33 39.290 +49 44 28.90 V C57
2023-12-31 03:21:44 S 06 33 34.872 +49 44 28.79 V C57
2023-12-31 03:41:44 S 06 33 30.838 +49 44 22.20 V C57
2023-12-31 04:41:44 S 06 33 17.678 +49 44 22.34 V C57
2023-12-31 05:01:44 S 06 33 13.152 +49 44 16.30 V C57
2023-12-31 05:21:44 S 06 33 09.487 +49 44 18.92 V C57
2023-12-31 05:41:44 S 06 33 04.579 +49 44 17.38 V C57
2023-12-31 07:21:44 S 06 32 42.593 +49 44 02.58 V C57
2023-12-31 07:21:44 s 1 -12634.323 0 +232343.16 5500.0 C57
2023-12-31 07:41:44 S 06 32 38.832 +49 43 55.06 V C57
2023-12-31 07:41:44 s 1 -13586.572 0 +231378.40 4010.0 C57
2023-12-31 08:01:44 S 06 32 34.356 +49 44 00.78 V C57
2023-12-31 08:01:44 s 1 -14538.355 0 +230405.11 7780.0 C57
2023-12-31 08:21:44 S 06 32 30.430 +49 44 00.49 V C57
2023-12-31 08:21:44 s 1 -15489.640 0 +229423.40 6880.0 C57
2023-12-31 08:41:44 S 06 32 26.530 +49 43 51.85 V C57
2023-12-31 08:41:44 s 1 -16440.381 0 +228433.13 360.0 C57
2023-12-31 09:01:44 S 06 32 21.830 +49 43 51.31 V C57
2023-12-31 09:01:44 s 1 -17390.537 0 +227434.25 7640.0 C57
2023-12-31 09:21:44 S 06 32 16.963 +49 43 52.21 V C57
2023-12-31 09:21:44 s 1 -18340.076 0 +226426.87 8800.0 C57
2023-12-31 09:41:44 S 06 32 12.994 +49 43 49.26 V C57
2023-12-31 09:41:44 s 1 -19288.949 0 +225410.84 2860.0 C57
2023-12-31 10:01:44 S 06 32 08.659 +49 43 41.56 V C57
2023-12-31 10:01:44 s 1 -20237.113 0 +224386.12 9200.0 C57
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)