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
2023-12-29 11:21:44 s 1 +106927.00 4 +295370.28 4610.0 C57
2023-12-29 11:41:44 S 06 41 58.591 +49 44 40.34 V C57
2023-12-29 11:41:44 s 1 +106117.83 0 +295307.61 7460.0 C57
2023-12-29 12:41:44 S 06 41 46.793 +49 44 42.32 V C57
2023-12-29 12:41:44 s 1 +103678.31 8 +295086.56 4040.0 C57
2023-12-29 13:01:45 S 06 41 42.365 +49 44 45.49 V C57
2023-12-29 13:01:45 s 1 +102861.17 0 +295001.78 5880.0 C57
2023-12-29 13:21:44 S 06 41 38.441 +49 44 47.29 V C57
2023-12-29 13:21:44 s 1 +102042.07 5 +294911.50 7300.0 C57
2023-12-29 13:41:44 S 06 41 34.236 +49 44 48.44 V C57
2023-12-29 13:41:44 s 1 +101221.01 2 +294815.61 8150.0 C57
2023-12-29 14:01:44 S 06 41 29.395 +49 44 43.04 V C57
2023-12-29 14:01:44 s 1 +100397.98 8 +294714.10 8270.0 C57
2023-12-29 14:21:44 S 06 41 25.613 +49 44 47.58 V C57
2023-12-29 14:21:44 s 1 +99573.043 0 +294607.04 7540.0 C57
2023-12-29 14:41:44 S 06 41 21.343 +49 44 51.29 V C57
2023-12-29 14:41:44 s 1 +98746.158 0 +294494.32 5790.0 C57
2023-12-29 15:01:44 S 06 41 17.107 +49 44 50.46 V C57
2023-12-29 15:01:44 s 1 +97917.340 0 +294375.93 2860.0 C57
2023-12-29 15:21:44 S 06 41 12.614 +49 44 52.94 V C57
2023-12-29 15:21:44 s 1 +97086.628 0 +294251.93 8620.0 C57
2023-12-29 17:41:44 S 06 40 43.193 +49 45 10.87 V C57
2023-12-29 17:41:44 s 1 +91218.839 0 +293223.80 8820.0 C57
2023-12-29 18:01:44 S 06 40 40.224 +49 45 00.22 V C57
2023-12-29 18:01:44 s 1 +90373.155 0 +293053.83 8360.0 C57
2023-12-29 19:01:44 S 06 40 27.391 +49 45 04.32 V C57
2023-12-29 19:01:44 s 1 +87825.229 0 +292509.02 9870.0 C57
2023-12-29 19:21:44 S 06 40 23.263 +49 45 05.15 V C57
2023-12-29 19:21:44 s 1 +86972.328 0 +292315.72 7460.0 C57
2023-12-29 19:41:44 S 06 40 18.799 +49 45 08.64 V C57
2023-12-29 19:41:44 s 1 +86117.637 0 +292116.50 1630.0 C57
2023-12-29 20:01:44 S 06 40 14.196 +49 45 08.82 V C57
2023-12-29 20:01:44 s 1 +85261.163 0 +291911.34 2200.0 C57
2023-12-29 20:21:44 S 06 40 10.351 +49 45 10.98 V C57
2023-12-29 20:21:44 s 1 +84402.945 0 +291700.32 9060.0 C57
2023-12-29 21:21:44 S 06 39 57.744 +49 45 16.34 V C57
2023-12-29 21:21:44 s 1 +81817.805 0 +291031.39 5380.0 C57
2023-12-29 21:41:44 S 06 39 53.585 +49 45 15.66 V C57
2023-12-29 21:41:44 s 1 +80952.643 0 +290796.44 5510.0 C57
2023-12-29 22:01:44 S 06 39 49.517 +49 45 18.90 V C57
2023-12-29 22:01:44 s 1 +80085.763 0 +290555.43 990.0 C57
2023-12-29 22:21:44 S 06 39 45.530 +49 45 16.31 V C57
2023-12-29 22:21:44 s 1 +79217.205 0 +290308.43 1730.0 C57
2023-12-29 22:41:44 S 06 39 40.190 +49 45 15.12 V C57
2023-12-29 22:41:44 s 1 +78346.957 0 +290055.36 7470.0 C57
2023-12-29 23:01:44 S 06 39 36.835 +49 45 17.42 V C57
2023-12-29 23:01:44 s 1 +77475.026 0 +289796.17 8020.0 C57
2023-12-29 23:21:44 S 06 39 32.652 +49 45 17.57 V C57
2023-12-29 23:21:44 s 1 +76601.450 0 +289530.93 3280.0 C57
2023-12-29 23:41:44 S 06 39 27.893 +49 45 22.21 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)