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
2003-04-03 04:43:44 C 07 23 51.82 +61 48 45.2 17.2 H72
2003-04-03 04:46:24 C 07 23 51.61 +61 48 51.4 17.0 H72
2003-04-03 04:49:03 C 07 23 51.55 +61 48 58.4 17.2 H72
2003-04-03 04:51:42 C 07 23 51.22 +61 49 03.8 17.4 H72
2003-04-03 04:54:22 C 07 23 51.07 +61 49 09.8 17.2 H72
2003-04-03 04:57:02 C 07 23 50.90 +61 49 16.1 17.4 H72
2003-04-03 04:59:43 C 07 23 50.78 +61 49 23.7 17.2 H72
2003-04-03 20:09:48 C 07 23 00.92 +62 26 30.5 c 938
2003-04-03 20:16:47 C 07 23 00.62 +62 26 47.6 c 938
2003-04-03 20:23:55 C 07 22 59.87 +62 27 04.4 c 938
2003-04-03 20:31:01 C 07 22 59.19 +62 27 23.5 c 938
2003-04-04 20:03:52 C 07 21 37.07 +63 22 53.2 d 557
2003-04-04 20:19:44 C 07 21 36.02 +63 23 29.4 d 557
2003-04-04 20:33:21 C 07 21 35.10 +63 24 00.1 d 557
2003-04-04 20:49:13 C 07 21 34.04 +63 24 36.0 d 557
2003-04-04 21:09:30 C 07 21 32.63 +63 25 21.4 d 557
2003-04-05 01:40:47 C 07 21 17.55 +63 36 05.4 17.2 d H72
2003-04-05 01:43:26 C 07 21 17.34 +63 36 10.9 17.1 d H72
2003-04-05 01:46:06 C 07 21 17.17 +63 36 17.1 17.1 d H72
2003-04-05 01:54:07 C 07 21 16.50 +63 36 33.8 16.8 d H72
2003-04-05 01:59:28 C 07 21 16.15 +63 36 47.5 17.1 d H72
2003-04-05 02:02:09 C 07 21 15.94 +63 36 52.6 17.1 d H72
2003-04-05 02:04:49 C 07 21 15.84 +63 36 58.7 17.2 d H72
2003-04-05 20:56:55 C 07 20 10.73 +64 19 38.9 d 232
2003-04-05 21:04:20 C 07 20 10.16 +64 19 53.0 d 232
2003-04-05 21:13:41 C 07 20 09.47 +64 20 15.5 d 232
2003-04-06 20:35:50 C 07 18 48.99 +65 11 32.8 c 621
2003-04-06 20:37:26 C 07 18 48.86 +65 11 36.1 c 621
2003-04-06 20:39:02 C 07 18 48.76 +65 11 39.4 c 621
2003-04-06 20:40:39 C 07 18 48.65 +65 11 42.8 c 621
2003-04-06 20:42:15 C 07 18 48.54 +65 11 46.3 c 621
2003-04-07 23:00:04 C 07 17 15.77 +66 07 21.9 c 621
2003-04-07 23:01:40 C 07 17 15.66 +66 07 25.2 c 621
2003-04-07 23:03:16 C 07 17 15.59 +66 07 28.4 c 621
2003-04-07 23:04:54 C 07 17 15.48 +66 07 31.6 c 621
2003-04-07 23:06:30 C 07 17 15.38 +66 07 34.8 c 621
2003-04-08 02:12:49 C 07 17 05.92 +66 13 45.0 d 049
2003-04-08 02:16:20 C 07 17 05.70 +66 13 52.8 d 049
2003-04-08 02:19:40 C 07 17 05.56 +66 13 59.3 d 049
2003-04-08 02:25:39 C 07 17 05.26 +66 14 11.7 d 049
2003-04-08 02:28:21 C 07 17 05.15 +66 14 16.7 d 049
2003-04-08 02:31:05 C 07 17 05.00 +66 14 22.9 d 049
2003-04-14 02:03:21 C 07 07 58.61 +70 44 45.6 d 049
2003-04-14 02:05:33 C 07 07 58.52 +70 44 49.4 d 049
2003-04-14 02:07:37 C 07 07 58.33 +70 44 52.7 d 049
2003-04-14 02:56:26 C 07 07 54.27 +70 46 49.8 17.5 c 704
2003-04-14 03:14:11 C 07 07 52.58 +70 47 19.2 17.6 c 704
2003-04-14 03:31:59 C 07 07 50.88 +70 47 48.7 17.5 c 704
2003-04-14 03:49:38 C 07 07 49.39 +70 48 17.1 17.7 c 704
2003-04-14 04:08:02 C 07 07 47.78 +70 48 47.5 18.4 c 704
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)