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
2022-08-21 19:36:41 C 04 36 29.58 +70 26 06.4 q 168
2022-08-21 20:25:38 C 04 36 06.58 +70 21 22.8 q 168
2022-08-21 21:38:42 C 04 35 31.55 +70 14 16.9 q 168
2022-08-23 02:52:12 C 04 22 34.766 +67 01 06.89 X K74
2022-08-23 02:54:22 C 04 22 33.780 +67 00 51.66 X K74
2022-08-23 03:01:19 C 04 22 30.677 +67 00 02.38 X K74
2022-08-23 03:03:26 C 04 22 29.758 +66 59 47.33 X K74
2022-08-23 05:20:16 C 04 21 39.44 +66 42 28.3 q W58
2022-08-23 05:44:03 C 04 21 29.99 +66 39 38.6 q W58
2022-08-23 06:08:11 C 04 21 19.57 +66 36 48.1 q W58
2022-08-24 22:56:56 C 04 06 07.90 +60 52 50.6 V C23
2022-08-24 23:01:27 C 04 06 06.39 +60 52 08.8 V C23
2022-08-24 23:07:13 C 04 06 04.47 +60 51 15.7 V C23
2022-08-25 23:25:27 C 03 58 14.374 +56 41 08.38 V Z80
2022-08-25 23:30:57 C 03 58 12.689 +56 40 08.54 V Z80
2022-08-25 23:35:10 C 03 58 11.446 +56 39 23.15 V Z80
2022-08-26 14:00:56 C 03 53 51.631 +53 53 59.75 V T08
2022-08-26 14:06:11 C 03 53 49.862 +53 52 57.18 V T08
2022-08-26 14:33:08 C 03 53 40.714 +53 47 34.98 V T08
2022-08-26 14:55:44 C 03 53 33.010 +53 43 03.32 V T08
2022-08-26 21:05:31 C 03 51 51.022 +52 24 05.11 V Z80
2022-08-26 21:10:21 C 03 51 49.733 +52 23 04.74 V Z80
2022-08-26 21:16:18 C 03 51 48.254 +52 21 50.33 V Z80
2022-08-26 21:45:57 C 03 51 40.87 +52 15 47.8 V C23
2022-08-26 21:50:53 C 03 51 39.57 +52 14 46.5 V C23
2022-08-26 21:56:13 C 03 51 38.12 +52 13 40.0 V C23
2022-08-27 22:40:59 C 03 45 00.792 +46 36 22.50 V Z80
2022-08-27 23:02:25 C 03 44 55.351 +46 31 14.74 V Z80
2022-08-27 23:26:15 C 03 44 49.349 +46 25 31.80 V Z80
2022-08-28 00:30:53 C 03 44 31.84 +46 10 03.5 V L65
2022-08-28 01:07:43 C 03 44 21.86 +46 01 07.8 V L65
2022-08-28 01:37:12 C 03 44 13.80 +45 53 56.6 V L65
2022-08-28 04:07:34 S 03 43 24.070 +45 16 37.78 L C51
2022-08-28 05:42:11 S 03 43 00.194 +44 52 55.09 L C51
2022-08-28 13:19:17 C 03 41 21.010 +42 56 06.83 V T05
2022-08-28 13:23:52 C 03 41 19.706 +42 54 55.58 V T05
2022-08-28 13:31:41 C 03 41 17.479 +42 52 53.80 V T05
2022-08-28 13:58:56 C 03 41 09.665 +42 45 48.13 V T05
2022-08-28 23:19:45 C 03 38 58.60 +40 12 39.1 V G33
2022-08-28 23:21:26 C 03 38 58.20 +40 12 11.6 V G33
2022-08-28 23:23:07 C 03 38 57.79 +40 11 44.2 V G33
2022-08-28 23:24:54 C 03 38 57.36 +40 11 15.1 V G33
2022-08-28 23:29:30 C 03 38 56.26 +40 09 59.9 V G33
2022-08-28 23:31:11 C 03 38 55.84 +40 09 32.3 V G33
2022-08-28 23:32:52 C 03 38 55.44 +40 09 04.8 V G33
2022-08-28 23:34:28 C 03 38 55.05 +40 08 38.6 V G33
2022-08-28 23:36:15 C 03 38 54.63 +40 08 09.7 V G33
2022-08-29 16:36:25 C 03 35 03.47 +35 15 06.2 W N83
2022-08-29 18:11:45 C 03 34 42.28 +34 47 04.8 W N83
2022-08-29 19:04:25 C 03 34 29.99 +34 31 30.7 W N83
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)