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
2022-08-29 20:03:05 C 03 34 15.85 +34 14 04.2 W N83
2022-08-29 23:18:29 C 03 33 33.902 +33 13 56.24 V Z80
2022-08-29 23:27:48 C 03 33 31.850 +33 11 07.94 V Z80
2022-08-29 23:38:24 C 03 33 29.472 +33 07 56.10 V Z80
2022-08-30 14:04:44 C 03 30 22.260 +28 38 39.80 V T05
2022-08-30 14:07:21 C 03 30 21.607 +28 37 50.02 V T05
2022-08-30 14:37:08 C 03 30 14.100 +28 28 19.74 V T05
2022-08-30 14:41:42 C 03 30 12.950 +28 26 52.19 V T05
2022-08-30 17:40:25 C 03 29 42.62 +27 27 41.7 W N83
2022-08-30 18:15:46 C 03 29 35.09 +27 16 25.5 W N83
2022-08-30 19:38:25 C 03 29 16.87 +26 49 55.1 W N83
2022-08-30 20:22:25 C 03 29 06.76 +26 35 43.1 W N83
2022-08-31 00:10:26 C 03 28 21.598 +25 20 32.57 V Z80
2022-08-31 01:05:30 C 03 28 09.775 +25 02 35.66 V Z80
2022-08-31 01:15:12 C 03 28 04.96 +24 59 51.2 V 089
2022-08-31 01:18:04 C 03 28 04.30 +24 58 54.7 V 089
2022-08-31 01:20:56 C 03 28 03.63 +24 57 58.2 V 089
2022-08-31 01:23:48 C 03 28 02.98 +24 57 01.7 V 089
2022-08-31 01:26:40 C 03 28 02.28 +24 56 05.8 V 089
2022-08-31 01:28:20 C 03 28 03.95 +24 55 10.5 V L65
2022-08-31 01:29:32 C 03 28 01.65 +24 55 09.3 V 089
2022-08-31 01:32:24 C 03 28 00.95 +24 54 12.9 V 089
2022-08-31 01:37:09 C 03 28 01.98 +24 52 17.2 V L65
2022-08-31 01:47:37 C 03 27 59.64 +24 48 51.6 V L65
2022-08-31 02:07:08 C 03 27 56.234 +24 42 26.57 V Z80
2022-08-31 03:00:44 C 03 27 44.191 +24 24 51.34 V Z80
2022-08-31 12:52:46 C 03 25 50.323 +21 08 55.32 V T05
2022-08-31 12:56:45 C 03 25 49.406 +21 07 35.83 V T05
2022-08-31 13:24:14 C 03 25 43.020 +20 58 25.32 V T05
2022-08-31 13:28:47 C 03 25 41.954 +20 56 54.02 V T05
2022-09-01 01:35:04 C 03 23 23.12 +16 50 10.4 V L65
2022-09-01 01:52:14 C 03 23 19.49 +16 44 22.0 V L65
2022-09-01 02:27:36 C 03 23 12.00 +16 32 24.2 V L65
2022-09-01 14:20:31 C 03 20 59.806 +12 31 42.35 V T08
2022-09-01 14:32:48 C 03 20 57.053 +12 27 32.65 V T08
2022-09-01 15:15:22 C 03 20 47.513 +12 13 06.74 V T08
2022-09-01 15:18:00 C 03 20 46.925 +12 12 13.36 V T08
2022-09-02 00:11:27 C 03 19 17.96 +09 10 37.4 V C23
2022-09-02 00:17:13 C 03 19 16.86 +09 08 41.9 V C23
2022-09-02 00:22:08 C 03 19 15.90 +09 07 02.4 V C23
2022-09-02 01:29:20 C 03 19 02.33 +08 44 28.7 V L65
2022-09-02 02:44:00 C 03 18 47.42 +08 19 27.5 V L65
2022-09-02 02:59:52 C 03 18 44.22 +08 14 08.6 V L65
2022-09-02 07:23:19 C 03 18 01.09 +06 46 35.7 q W58
2022-09-02 07:40:26 C 03 17 57.61 +06 40 54.4 q W58
2022-09-02 07:57:22 C 03 17 54.15 +06 35 16.9 q W58
2022-09-02 13:44:34 C 03 16 53.825 +04 41 09.31 V T05
2022-09-02 13:47:50 C 03 16 53.131 +04 40 05.16 V T05
2022-09-02 13:52:23 C 03 16 52.174 +04 38 35.34 V T05
2022-09-02 14:01:30 C 03 16 50.251 +04 35 35.52 V T05
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)