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
2023-12-28 23:41:44 s 1 +133921.92 3 +294223.50 1220.0 C57
2023-12-29 00:01:44 S 06 44 23.458 +49 43 12.04 V C57
2023-12-29 00:01:44 s 1 +133187.95 7 +294343.42 8900.0 C57
2023-12-29 00:21:44 S 06 44 19.250 +49 43 16.36 V C57
2023-12-29 00:21:44 s 1 +132451.73 7 +294458.42 1940.0 C57
2023-12-29 00:41:44 S 06 44 14.983 +49 43 18.19 V C57
2023-12-29 00:41:44 s 1 +131713.23 7 +294568.41 390.0 C57
2023-12-29 01:01:45 S 06 44 10.174 +49 43 23.02 V C57
2023-12-29 01:01:45 s 1 +130972.46 1 +294673.38 4350.0 C57
2023-12-29 01:21:45 S 06 44 07.087 +49 43 25.86 V C57
2023-12-29 01:21:45 s 1 +130229.45 1 +294773.38 4020.0 C57
2023-12-29 01:41:45 S 06 44 02.803 +49 43 23.84 V C57
2023-12-29 01:41:45 s 1 +129484.18 4 +294868.34 9460.0 C57
2023-12-29 02:01:44 S 06 43 58.951 +49 43 33.74 V C57
2023-12-29 02:01:44 s 1 +128736.66 3 +294958.22 780.0 C57
2023-12-29 02:21:44 S 06 43 54.588 +49 43 31.48 V C57
2023-12-29 02:21:44 s 1 +127986.92 8 +295043.10 8170.0 C57
2023-12-29 02:41:44 S 06 43 49.620 +49 43 37.38 V C57
2023-12-29 02:41:44 s 1 +127234.95 9 +295122.89 1680.0 C57
2023-12-29 03:01:44 S 06 43 45.979 +49 43 35.87 V C57
2023-12-29 03:01:44 s 1 +126480.75 6 +295197.57 1440.0 C57
2023-12-29 03:21:44 S 06 43 41.911 +49 43 36.23 V C57
2023-12-29 03:21:44 s 1 +125724.36 3 +295267.21 7630.0 C57
2023-12-29 03:41:44 S 06 43 37.961 +49 43 45.73 V C57
2023-12-29 03:41:44 s 1 +124965.75 7 +295331.71 320.0 C57
2023-12-29 04:01:45 S 06 43 34.219 +49 43 45.84 V C57
2023-12-29 04:01:45 s 1 +124204.94 0 +295391.05 9620.0 C57
2023-12-29 04:21:45 S 06 43 30.499 +49 43 51.53 V C57
2023-12-29 04:21:45 s 1 +123441.95 5 +295445.31 5730.0 C57
2023-12-29 04:41:45 S 06 43 26.023 +49 43 52.18 V C57
2023-12-29 04:41:45 s 1 +122676.78 0 +295494.39 8710.0 C57
2023-12-29 05:01:44 S 06 43 22.440 +49 43 56.17 V C57
2023-12-29 05:01:44 s 1 +121909.41 7 +295538.27 8690.0 C57
2023-12-29 07:01:45 S 06 42 56.136 +49 44 06.04 V C57
2023-12-29 07:01:45 s 1 +117260.06 9 +295692.32 3130.0 C57
2023-12-29 07:21:45 S 06 42 52.747 +49 44 10.90 V C57
2023-12-29 07:21:45 s 1 +116477.72 1 +295699.64 5830.0 C57
2023-12-29 07:41:44 S 06 42 47.734 +49 44 10.46 V C57
2023-12-29 07:41:44 s 1 +115693.25 2 +295701.66 6570.0 C57
2023-12-29 08:01:44 S 06 42 43.838 +49 44 14.03 V C57
2023-12-29 08:01:44 s 1 +114906.66 7 +295698.34 5490.0 C57
2023-12-29 08:21:44 S 06 42 39.854 +49 44 14.17 V C57
2023-12-29 08:21:44 s 1 +114118.00 6 +295689.76 2740.0 C57
2023-12-29 08:41:44 S 06 42 36.696 +49 44 10.79 V C57
2023-12-29 08:41:44 s 1 +113327.24 9 +295675.81 8440.0 C57
2023-12-29 10:21:45 S 06 42 15.518 +49 44 29.87 V C57
2023-12-29 10:21:45 s 1 +109342.42 3 +295525.50 8430.0 C57
2023-12-29 10:41:44 S 06 42 11.345 +49 44 30.08 V C57
2023-12-29 10:41:44 s 1 +108539.31 1 +295479.22 7690.0 C57
2023-12-29 11:21:44 S 06 42 01.939 +49 44 25.58 V 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)