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
2003-03-29 03:49:11 C 07 31 11.32 +56 19 24.0 17.2 H72
2003-03-29 03:51:26 C 07 31 11.12 +56 19 30.6 17.0 H72
2003-03-29 11:56:32 C 07 30 41.81 +56 43 44.4 m 300
2003-03-29 11:59:28 C 07 30 41.70 +56 43 51.8 m 300
2003-03-29 12:02:26 C 07 30 41.44 +56 44 00.2 m 300
2003-03-29 12:05:19 C 07 30 41.22 +56 44 09.0 m 300
2003-03-29 12:08:15 C 07 30 40.86 +56 44 16.5 m 300
2003-03-29 12:11:09 C 07 30 40.83 +56 44 26.3 m 300
2003-03-30 01:57:16 C 07 29 50.27 +57 24 44.7 c 750
2003-03-30 02:06:05 C 07 29 49.60 +57 25 10.0 c 750
2003-03-30 02:13:29 C 07 29 49.06 +57 25 31.4 c 750
2003-03-30 11:31:05 C 07 29 14.23 +57 52 20.3 300
2003-03-30 11:52:05 C 07 29 12.64 +57 53 20.9 300
2003-03-30 12:58:07 C 07 29 07.59 +57 56 22.1 300
2003-03-30 13:01:01 C 07 29 07.43 +57 56 32.5 300
2003-03-30 13:03:56 C 07 29 07.20 +57 56 38.2 300
2003-03-30 13:06:50 C 07 29 06.91 +57 56 47.5 300
2003-03-30 13:09:45 C 07 29 06.75 +57 56 56.4 300
2003-04-01 02:49:13 C 07 26 50.82 +59 40 43.2 c 750
2003-04-01 02:55:20 C 07 26 49.21 +59 41 06.6 17.1 H72
2003-04-01 02:59:45 C 07 26 50.06 +59 41 10.5 c 750
2003-04-01 03:01:34 C 07 26 48.83 +59 41 22.5 17.0 H72
2003-04-01 03:06:02 C 07 26 48.59 +59 41 33.6 16.9 H72
2003-04-01 03:06:42 C 07 26 49.55 +59 41 29.0 c 750
2003-04-01 03:07:47 C 07 26 48.53 +59 41 37.8 17.0 H72
2003-04-01 03:09:55 C 07 26 48.35 +59 41 44.1 17.3 H72
2003-04-01 03:12:14 C 07 26 49.12 +59 41 43.3 c 750
2003-04-01 03:13:57 C 07 26 48.05 +59 41 54.3 16.9 H72
2003-04-01 03:15:42 C 07 26 47.96 +59 41 59.5 16.8 H72
2003-04-01 19:18:03 C 07 25 52.35 +60 24 08.6 d 557
2003-04-01 19:28:33 C 07 25 51.61 +60 24 34.8 d 557
2003-04-01 19:41:09 C 07 25 50.71 +60 25 07.5 d 557
2003-04-01 19:57:57 C 07 25 49.54 +60 25 50.5 d 557
2003-04-01 20:10:33 C 07 25 48.65 +60 26 22.5 d 557
2003-04-01 21:36:37 C 07 25 43.29 +60 30 11.4 c 938
2003-04-01 21:43:52 C 07 25 42.73 +60 30 30.3 c 938
2003-04-01 21:49:39 C 07 25 42.42 +60 30 44.6 c 938
2003-04-01 21:56:47 C 07 25 41.87 +60 31 02.4 c 938
2003-04-01 22:05:06 C 07 25 41.35 +60 31 23.5 c 938
2003-04-02 00:47:34 C 07 25 33.37 +60 38 35.1 16.7 H72
2003-04-02 00:49:31 C 07 25 33.13 +60 38 40.2 16.6 H72
2003-04-02 00:51:26 C 07 25 33.06 +60 38 45.1 16.6 H72
2003-04-02 00:52:49 C 07 25 32.90 +60 38 48.3 16.7 H72
2003-04-02 00:54:43 C 07 25 32.72 +60 38 53.7 16.7 H72
2003-04-03 00:55:24 C 07 24 08.05 +61 39 37.2 17.1 H72
2003-04-03 01:00:40 C 07 24 07.82 +61 39 49.3 17.1 H72
2003-04-03 01:03:20 C 07 24 07.52 +61 39 56.5 17.0 H72
2003-04-03 01:05:59 C 07 24 07.26 +61 40 02.9 17.0 H72
2003-04-03 01:08:40 C 07 24 07.13 +61 40 09.5 17.1 H72
2003-04-03 01:11:20 C 07 24 06.86 +61 40 15.9 17.2 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)