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
2015-03-13 02:18:15 C 18 32 54.00 +10 21 39.8 q 160
2015-03-19 03:00:07 C 19 06 48.51 +14 06 37.7 q 160
2015-03-19 03:03:32 C 19 06 49.23 +14 06 42.8 q 160
2015-03-19 03:06:56 C 19 06 49.99 +14 06 47.8 q 160
2015-04-08 02:40:02 C 20 46 12.28 +22 07 02.2 q 160
2015-04-08 02:43:39 C 20 46 12.92 +22 07 04.7 q 160
2015-04-08 02:47:17 C 20 46 13.52 +22 07 07.7 q 160
2015-04-09 02:34:31 C 20 50 42.03 +22 21 26.1 q 160
2015-04-09 02:38:04 C 20 50 42.66 +22 21 28.3 q 160
2015-04-09 02:41:36 C 20 50 43.35 +22 21 30.6 q 160
2015-10-02 15:43:42 S 06 32 12.982 -14 47 53.34 L C51
2015-10-07 18:31:23 S 06 40 43.270 -17 08 01.72 L C51
2015-11-23 08:23:13 C 07 10 06.73 -37 04 02.3 u 807
2015-11-23 08:24:57 C 07 10 06.68 -37 04 03.8 u 807
2015-11-23 08:26:39 C 07 10 06.63 -37 04 05.3 u 807
2015-11-23 08:28:22 C 07 10 06.59 -37 04 06.7 u 807
2015-11-23 08:30:05 C 07 10 06.54 -37 04 08.2 u 807
2016-01-05 00:24:05 C 05 56 14.21 -39 47 46.5 q Y00
2016-01-05 00:37:51 C 05 56 13.11 -39 47 35.8 q Y00
2016-01-05 00:52:18 C 05 56 11.77 -39 47 24.6 q Y00
2016-01-17 08:48:59 C 05 33 07.60 -34 28 03.4 L T05
2016-01-17 08:53:24 C 05 33 07.40 -34 27 57.7 L T05
2016-01-17 09:13:26 C 05 33 05.97 -34 27 30.5 L T05
2016-01-17 09:34:22 C 05 33 04.52 -34 27 01.2 L T05
2016-01-18 08:49:07 C 05 31 37.90 -33 55 08.5 L T05
2016-01-18 09:13:33 C 05 31 36.42 -33 54 35.9 L T05
2016-01-18 09:37:58 C 05 31 34.79 -33 54 00.0 L T05
2016-01-18 10:02:29 C 05 31 33.19 -33 53 25.4 L T05
2016-01-21 07:11:52 C 05 27 38.286 -32 13 30.90 L F51
2016-01-21 07:28:05 C 05 27 37.350 -32 13 06.77 L F51
2016-01-21 07:44:11 C 05 27 36.430 -32 12 42.69 L F51
2016-01-29 07:20:47 C 05 19 39.68 -27 02 00.2 L T05
2016-01-29 07:41:59 C 05 19 38.92 -27 01 21.4 L T05
2016-01-29 08:03:34 C 05 19 38.18 -27 00 43.5 L T05
2016-01-29 08:24:39 C 05 19 37.44 -27 00 06.5 L T05
2016-02-05 06:51:06 C 05 16 14.50 -21 59 41.6 L T05
2016-02-05 07:13:18 C 05 16 14.06 -21 59 00.7 L T05
2016-02-05 07:35:41 C 05 16 13.78 -21 58 17.5 L T05
2016-02-05 07:57:25 C 05 16 13.58 -21 57 36.5 L T05
2016-02-13 02:30:26 C 05 16 08.65 -16 01 26.7 R G45
2016-02-13 02:37:16 C 05 16 08.69 -16 01 13.6 R G45
2016-02-13 02:56:14 C 05 16 08.80 -16 00 36.7 R G45
2016-02-13 03:00:56 C 05 16 08.84 -16 00 27.7 R G45
2016-02-13 05:33:37 C 05 16 10.484 -15 55 28.93 L F51
2016-02-13 05:51:23 C 05 16 10.579 -15 54 54.52 L F51
2016-02-13 06:26:57 C 05 16 10.747 -15 53 45.41 L F51
2016-02-24 18:48:25 S 05 22 31.790 -06 57 29.56 L C51
2016-02-24 21:57:06 S 05 22 38.381 -06 51 28.08 L C51
2016-02-25 04:14:51 S 05 22 51.96 -06 39 23.0 L C51
2016-02-25 10:32:24 S 05 23 05.575 -06 27 19.44 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)