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
2003-03-18 18:57:46 C 07 49 08.56 +40 42 27.5 d 151
2003-03-18 18:58:45 C 07 49 08.46 +40 42 32.2 d 151
2003-03-18 19:11:55 C 07 49 07.30 +40 43 31.4 c 127
2003-03-18 19:16:19 C 07 49 06.89 +40 43 51.5 c 127
2003-03-18 19:20:03 C 07 49 06.54 +40 44 09.0 c 127
2003-03-18 19:26:15 C 07 49 05.98 +40 44 37.8 c 127
2003-03-18 19:31:29 C 07 49 05.50 +40 45 01.8 c 127
2003-03-19 18:42:35 C 07 47 13.99 +42 29 59.3 d 151
2003-03-19 18:43:45 C 07 47 13.89 +42 30 04.5 d 151
2003-03-19 18:44:35 C 07 47 13.81 +42 30 08.2 d 151
2003-03-19 18:46:22 C 07 47 13.64 +42 30 16.1 d 151
2003-03-19 18:47:14 C 07 47 13.56 +42 30 19.9 d 151
2003-03-19 18:47:58 C 07 47 13.50 +42 30 23.4 d 151
2003-03-19 18:49:15 C 07 47 13.38 +42 30 29.0 d 151
2003-03-19 18:50:11 C 07 47 13.30 +42 30 33.0 d 151
2003-03-19 18:50:53 C 07 47 13.25 +42 30 36.3 d 151
2003-03-19 18:51:22 C 07 47 13.19 +42 30 39.1 d 151
2003-03-19 20:56:38 C 07 47 01.73 +42 39 52.5 c 560
2003-03-19 20:57:39 C 07 47 01.66 +42 39 56.8 c 560
2003-03-19 20:58:39 C 07 47 01.52 +42 40 00.8 c 560
2003-03-19 20:59:40 C 07 47 01.44 +42 40 05.6 c 560
2003-03-19 21:00:40 C 07 47 01.34 +42 40 09.7 c 560
2003-03-20 10:33:35 C 07 45 58.79 +43 39 37.4 m 300
2003-03-20 10:38:53 C 07 45 58.37 +43 40 01.6 m 300
2003-03-20 10:44:16 C 07 45 57.82 +43 40 24.0 m 300
2003-03-20 10:49:35 C 07 45 57.43 +43 40 46.6 m 300
2003-03-20 10:54:53 C 07 45 56.91 +43 41 11.0 m 300
2003-03-20 19:05:46 C 07 45 18.72 +44 16 08.7 d 151
2003-03-20 19:06:52 C 07 45 18.60 +44 16 13.4 d 151
2003-03-20 19:07:53 C 07 45 18.53 +44 16 17.5 d 151
2003-03-20 19:09:31 C 07 45 18.39 +44 16 24.2 d 151
2003-03-20 19:10:06 C 07 45 18.35 +44 16 26.7 d 151
2003-03-20 19:11:53 C 07 45 18.20 +44 16 34.3 d 151
2003-03-20 19:13:36 C 07 45 18.03 +44 16 41.7 d 151
2003-03-20 19:15:24 C 07 45 17.87 +44 16 49.1 d 151
2003-03-20 19:18:01 C 07 45 17.65 +44 17 00.5 d 151
2003-03-20 19:19:37 C 07 45 17.50 +44 17 07.6 d 151
2003-03-20 20:40:36 C 07 45 10.98 +44 22 58.0 c 938
2003-03-20 20:43:20 C 07 45 10.77 +44 23 10.4 c 938
2003-03-20 20:46:05 C 07 45 10.59 +44 23 20.6 c 938
2003-03-20 20:48:49 C 07 45 10.28 +44 23 32.8 c 938
2003-03-20 20:51:33 C 07 45 10.07 +44 23 44.6 c 938
2003-03-20 20:57:02 C 07 45 09.61 +44 24 07.5 c 938
2003-03-20 20:59:46 C 07 45 09.30 +44 24 19.1 c 938
2003-03-20 21:02:30 C 07 45 09.06 +44 24 30.5 c 938
2003-03-20 21:05:15 C 07 45 08.87 +44 24 42.5 c 938
2003-03-20 21:51:01 C 07 45 04.01 +44 27 47.2 c 560
2003-03-20 21:52:00 C 07 45 03.92 +44 27 51.7 c 560
2003-03-20 21:53:01 C 07 45 03.84 +44 27 55.6 c 560
2003-03-20 21:54:01 C 07 45 03.75 +44 28 00.1 c 560
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)