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
2003-03-24 18:55:41 C 07 38 13.79 +50 33 03.7 d 151
2003-03-24 18:56:56 C 07 38 13.68 +50 33 08.5 d 151
2003-03-24 18:58:05 C 07 38 13.59 +50 33 12.6 d 151
2003-03-24 18:59:16 C 07 38 13.48 +50 33 16.6 d 151
2003-03-24 19:00:28 C 07 38 13.40 +50 33 21.2 d 151
2003-03-24 19:01:39 C 07 38 13.29 +50 33 25.3 d 151
2003-03-24 19:03:12 C 07 38 13.20 +50 33 29.6 d 151
2003-03-24 19:22:26 C 07 38 11.38 +50 34 35.7 c 639
2003-03-24 19:27:40 C 07 38 10.96 +50 34 53.8 c 639
2003-03-24 19:35:02 C 07 38 10.30 +50 35 21.1 c 639
2003-03-24 19:40:49 C 07 38 09.86 +50 35 42.4 c 639
2003-03-24 19:54:08 C 07 38 08.81 +50 36 30.2 c 639
2003-03-25 19:09:48 C 07 36 32.39 +51 58 45.4 d 557
2003-03-25 19:34:26 C 07 36 30.44 +52 00 10.0 d 557
2003-03-25 20:04:39 C 07 36 28.03 +52 01 53.5 d 557
2003-03-25 20:48:16 C 07 36 24.58 +52 04 22.5 d 557
2003-03-25 21:08:24 C 07 36 23.02 +52 05 31.0 d 557
2003-03-25 22:14:55 C 07 36 17.96 +52 09 16.0 d 557
2003-03-25 23:23:15 C 07 36 12.98 +52 13 06.0 d 557
2003-03-26 11:09:53 C 07 35 27.01 +52 53 34.6 m 300
2003-03-26 11:11:29 C 07 35 26.87 +52 53 39.5 m 300
2003-03-26 11:13:03 C 07 35 26.74 +52 53 44.7 m 300
2003-03-26 11:14:36 C 07 35 26.56 +52 53 50.4 m 300
2003-03-26 11:16:11 C 07 35 26.42 +52 53 56.2 m 300
2003-03-26 11:17:45 C 07 35 26.33 +52 54 01.5 m 300
2003-03-26 18:31:26 C 07 34 58.12 +53 18 03.9 d 151
2003-03-26 18:33:04 C 07 34 58.04 +53 18 08.5 d 151
2003-03-26 18:34:18 C 07 34 57.97 +53 18 13.4 d 151
2003-03-26 18:35:46 C 07 34 57.81 +53 18 18.0 d 151
2003-03-26 18:36:55 C 07 34 57.69 +53 18 21.5 d 151
2003-03-26 18:39:15 C 07 34 57.49 +53 18 29.5 d 151
2003-03-26 18:39:55 C 07 34 57.46 +53 18 31.7 d 151
2003-03-26 18:41:00 C 07 34 57.36 +53 18 35.5 d 151
2003-03-26 18:43:07 C 07 34 57.26 +53 18 42.8 d 151
2003-03-26 18:45:10 C 07 34 57.04 +53 18 49.5 d 151
2003-03-27 12:29:07 C 07 33 44.71 +54 16 55.3 m 300
2003-03-27 12:34:05 C 07 33 44.38 +54 17 09.9 m 300
2003-03-27 12:58:03 C 07 33 42.52 +54 18 25.8 m 300
2003-03-27 13:02:35 C 07 33 42.17 +54 18 40.3 m 300
2003-03-28 03:34:38 C 07 32 44.63 +55 04 56.2 16.8 c H72
2003-03-28 03:37:59 C 07 32 44.42 +55 05 05.4 16.8 c H72
2003-03-28 03:40:53 C 07 32 44.10 +55 05 14.7 16.5 c H72
2003-03-28 03:43:29 C 07 32 44.02 +55 05 23.1 16.6 c H72
2003-03-28 03:48:06 C 07 32 43.59 +55 05 37.3 16.4 c H72
2003-03-29 00:23:28 C 07 31 27.40 +56 09 12.3 16.8 H72
2003-03-29 00:29:52 C 07 31 26.84 +56 09 31.6 16.5 H72
2003-03-29 00:31:39 C 07 31 26.75 +56 09 37.1 16.4 H72
2003-03-29 00:36:29 C 07 31 26.35 +56 09 51.6 16.4 H72
2003-03-29 03:42:46 C 07 31 11.68 +56 19 06.7 17.2 H72
2003-03-29 03:47:34 C 07 31 11.42 +56 19 20.3 17.0 H72
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)