161989 Cacus (1978 CA)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.2138350261 ± 2.00e+00
Semi-major axis (a)1.1226790934 AU ± 3.00e+00
Inclination (i)26.06541983° ± 4.00e+00
Long. of Asc. Node (Ω)161.20351445° ± 5.00e+00
Arg. of Perihelion (ω)102.10980322° ± 6.00e+00
Mean Anomaly (M)310.21565023° ± 4.33e-05
Mean Motion (n)0.8285692722°/day ± 3.32e+00
Perihelion dist (q)0.88261098 AU ± 3.26e+00
Aphelion dist (Q)1.36274721 AU ± 4.28e+00
Orbital Period1.18955206 yr ± 4.77e+00
NGA Modelr2
A2-2.41214999e-06 AU/d²
Physical Parameters
H (abs. magnitude)17.31
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-26
RMS Residual0.462″
Uncertainty0
Orbit TypeApollo
MOID0.013416 AU
Observations Used1566
Gaia Obs Used117
Oppositions6
Arc Total1978-2017
First Observation Used1978-02-08
Last Observation Used2023-01-28
Observations (1813)
Date Type RA Dec Mag Band Observatory
2003-02-23 07:56:10 C 08 45 06.01 -10 47 21.8 c H43
2003-02-23 07:58:09 C 08 45 05.81 -10 47 12.2 c H43
2003-02-23 08:00:08 C 08 45 05.72 -10 47 03.6 c H43
2003-02-23 19:08:04 C 08 43 57.76 -09 56 33.6 c 151
2003-02-23 19:09:48 C 08 43 57.57 -09 56 26.6 c 151
2003-02-23 19:12:19 C 08 43 57.33 -09 56 16.5 c 151
2003-02-23 19:13:41 C 08 43 57.19 -09 56 10.2 c 151
2003-02-23 19:14:37 C 08 43 57.04 -09 56 04.4 c 151
2003-02-23 19:17:15 C 08 43 56.77 -09 55 53.6 c 151
2003-02-23 19:18:32 C 08 43 56.64 -09 55 48.0 c 151
2003-02-23 19:20:40 C 08 43 56.38 -09 55 38.2 c 151
2003-02-23 19:21:36 C 08 43 56.25 -09 55 32.4 c 151
2003-02-23 19:23:20 C 08 43 56.08 -09 55 25.8 c 151
2003-02-24 12:50:04 C 08 42 03.60 -08 33 52.1 m 379
2003-02-24 12:53:07 C 08 42 03.29 -08 33 37.9 m 379
2003-02-24 12:54:29 C 08 42 03.11 -08 33 31.5 m 379
2003-02-24 12:56:12 C 08 42 02.89 -08 33 22.8 m 379
2003-02-24 18:44:46 C 08 41 26.88 -08 05 43.7 c 151
2003-02-24 18:46:12 C 08 41 26.71 -08 05 37.0 c 151
2003-02-24 18:47:24 C 08 41 26.61 -08 05 31.5 c 151
2003-02-24 18:48:37 C 08 41 26.46 -08 05 24.9 c 151
2003-02-24 18:49:29 C 08 41 26.31 -08 05 19.5 c 151
2003-02-24 18:51:08 C 08 41 26.19 -08 05 13.9 c 151
2003-02-24 18:52:33 C 08 41 26.00 -08 05 06.3 c 151
2003-02-24 18:53:46 C 08 41 25.87 -08 04 59.7 c 151
2003-02-24 18:55:34 C 08 41 25.66 -08 04 52.4 c 151
2003-02-24 18:56:27 C 08 41 25.56 -08 04 47.3 c 151
2003-02-24 22:30:38 C 08 41 00.90 -07 47 37.1 c 204
2003-02-24 22:31:53 C 08 41 00.75 -07 47 31.0 c 204
2003-02-24 22:34:23 C 08 41 00.47 -07 47 18.9 c 204
2003-02-24 22:38:54 C 08 40 59.95 -07 46 57.1 c 204
2003-02-24 22:41:25 C 08 40 59.66 -07 46 45.0 c 204
2003-02-25 12:00:58 C 08 39 35.14 -06 41 29.4 m 379
2003-02-25 12:02:21 C 08 39 35.02 -06 41 23.0 m 379
2003-02-25 12:04:34 C 08 39 34.78 -06 41 12.2 m 379
2003-02-25 12:05:53 C 08 39 34.60 -06 41 05.8 m 379
2003-02-25 12:07:58 C 08 39 34.37 -06 40 55.5 m 379
2003-02-25 12:09:12 C 08 39 34.19 -06 40 49.1 m 379
2003-02-25 20:09:00 C 08 38 42.71 -06 01 07.1 c 113
2003-02-25 20:10:51 C 08 38 42.50 -06 00 58.2 c 113
2003-02-25 20:12:40 C 08 38 42.30 -06 00 49.2 c 113
2003-02-25 20:14:28 C 08 38 42.09 -06 00 39.9 c 113
2003-02-25 20:16:18 C 08 38 41.87 -06 00 30.6 c 113
2003-02-25 20:32:09 C 08 38 39.77 -05 59 08.0 15.7 i 057
2003-02-25 20:36:04 C 08 38 39.74 -05 58 49.3 c 151
2003-02-25 20:37:33 C 08 38 39.58 -05 58 42.7 c 151
2003-02-25 20:37:58 C 08 38 39.24 -05 58 39.9 i 057
2003-02-25 20:38:35 C 08 38 39.44 -05 58 36.5 c 151
2003-02-25 20:40:06 C 08 38 39.29 -05 58 29.7 c 151
2003-02-25 20:40:17 C 08 38 38.84 -05 58 27.1 14.5 i 057
Radar Observations (5)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2022-08-24 07:20:00 86764067 10 us 8560 -14 -14
2022-08-24 07:50:00 86635720.898 1 us 8560 -14 -14
2022-08-26 12:30:00 74230837 1 us 8560 -14 -14
2022-08-29 09:30:00 62078989.8 1 us 8560 -14 -14
2022-09-02 11:40:00 58224907.73 1.5 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m)