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
2015-02-01 21:21:02 S 14 42 26.04 -15 30 40.8 L C51
2015-02-01 22:55:38 S 14 42 46.39 -15 29 10.1 L C51
2015-02-02 00:30:04 S 14 43 06.72 -15 27 39.9 L C51
2015-02-02 06:48:33 S 14 44 28.466 -15 21 35.68 L C51
2015-02-02 08:22:59 S 14 44 48.965 -15 20 05.24 L C51
2015-02-02 08:23:10 S 14 44 48.938 -15 20 04.49 L C51
2015-02-02 11:32:13 S 14 45 30.005 -15 17 00.35 L C51
2015-02-02 17:50:29 S 14 46 52.17 -15 10 47.5 L C51
2015-02-02 22:34:20 S 14 47 53.94 -15 06 04.5 L C51
2015-02-03 03:18:00 S 14 48 55.91 -15 01 19.9 L C51
2015-02-03 04:52:38 S 14 49 16.64 -14 59 42.8 L C51
2015-02-03 06:27:15 S 14 49 37.36 -14 58 06.8 L C51
2015-02-03 11:10:55 S 14 50 39.59 -14 53 16.6 L C51
2015-02-03 11:11:06 S 14 50 39.60 -14 53 17.8 L C51
2015-02-03 12:45:31 S 14 51 00.32 -14 51 39.1 L C51
2015-02-03 14:20:09 S 14 51 21.11 -14 50 02.5 L C51
2015-02-03 15:54:46 S 14 51 41.964 -14 48 24.37 L C51
2015-02-03 20:38:26 S 14 52 44.46 -14 43 28.3 L C51
2015-02-03 23:47:40 S 14 53 26.249 -14 40 09.01 L C51
2015-02-04 01:22:17 S 14 53 47.09 -14 38 28.9 L C51
2015-02-04 04:31:20 S 14 54 29.04 -14 35 09.5 L C51
2015-02-04 10:49:48 S 14 55 52.961 -14 28 23.34 L C51
2015-02-04 13:58:52 S 14 56 34.95 -14 25 00.4 L C51
2015-02-04 17:08:06 S 14 57 17.14 -14 21 34.4 L C51
2015-02-04 20:17:19 S 14 57 59.34 -14 18 07.1 L C51
2015-02-04 23:26:23 S 14 58 41.69 -14 14 37.8 L C51
2015-02-05 02:35:37 S 14 59 23.91 -14 11 08.7 L C51
2015-02-05 05:44:40 S 15 00 06.33 -14 07 38.6 L C51
2015-02-05 10:33:01 C 15 01 11.40 -14 02 28.0 u H21
2015-02-05 10:37:12 C 15 01 12.33 -14 02 23.1 u H21
2015-02-05 10:39:54 C 15 01 12.92 -14 02 20.0 u H21
2015-02-05 10:42:34 C 15 01 13.53 -14 02 17.3 u H21
2015-02-05 10:45:13 C 15 01 14.11 -14 02 14.4 u H21
2015-02-05 10:47:52 C 15 01 14.69 -14 02 11.4 u H21
2015-02-05 10:50:31 C 15 01 15.27 -14 02 08.6 u H21
2015-02-05 10:53:01 C 15 01 15.84 -14 02 05.6 u H21
2015-02-05 10:56:17 C 15 01 16.55 -14 02 02.1 u H21
2015-02-05 12:03:08 S 15 01 31.27 -14 00 32.2 L C51
2015-02-05 13:37:34 S 15 01 52.54 -13 58 44.6 L C51
2015-02-05 15:12:11 S 15 02 13.87 -13 56 58.9 L C51
2015-02-05 18:21:14 S 15 02 56.45 -13 53 22.5 L C51
2015-02-05 23:05:05 S 15 04 00.61 -13 47 55.9 L C51
2015-02-06 00:39:42 S 15 04 21.99 -13 46 07.2 L C51
2015-02-06 03:48:46 S 15 05 04.76 -13 42 26.6 L C51
2015-02-06 05:23:22 S 15 05 26.23 -13 40 36.0 L C51
2015-02-06 06:58:00 S 15 05 47.662 -13 38 49.20 L C51
2015-02-06 10:07:03 S 15 06 30.643 -13 35 04.24 L C51
2015-02-06 11:41:40 S 15 06 52.21 -13 33 12.0 L C51
2015-02-06 13:16:17 S 15 07 13.71 -13 31 20.6 L C51
2015-02-06 14:50:53 S 15 07 35.24 -13 29 26.0 L C51
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)