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
2003-01-11 10:57:02 C 09 46 25.42 -34 34 20.2 18.0 c 644
2003-01-16 16:05:51 C 09 45 00.36 -34 47 06.1 e 413
2003-01-16 16:15:33 C 09 45 00.14 -34 47 06.3 e 413
2003-01-16 16:25:27 C 09 44 59.91 -34 47 06.3 e 413
2003-01-17 13:00:21 C 09 44 38.23 -34 46 59.4 e 413
2003-01-17 13:03:00 C 09 44 38.17 -34 46 59.5 e 413
2003-01-17 13:05:38 C 09 44 38.11 -34 46 59.5 e 413
2003-01-19 08:27:41 C 09 43 41.21 -34 44 49.8 17.3 c 644
2003-01-19 08:58:05 C 09 43 40.31 -34 44 48.0 16.4 c 644
2003-01-19 09:28:09 C 09 43 39.37 -34 44 44.7 16.8 c 644
2003-01-20 12:24:20 C 09 42 59.34 -34 41 06.2 e 413
2003-01-20 12:26:58 C 09 42 59.25 -34 41 06.0 e 413
2003-01-20 12:29:36 C 09 42 59.16 -34 41 05.8 e 413
2003-01-20 14:19:12 C 09 42 56.29 -34 40 48.9 c 322
2003-01-20 14:27:35 C 09 42 56.02 -34 40 48.0 c 322
2003-01-20 14:49:35 C 09 42 55.33 -34 40 45.2 c 322
2003-01-20 14:57:10 C 09 42 55.10 -34 40 44.3 c 322
2003-01-20 15:16:32 C 09 42 54.53 -34 40 41.6 c 322
2003-01-20 15:24:14 C 09 42 54.23 -34 40 40.6 c 322
2003-01-20 16:23:27 C 09 42 52.34 -34 40 33.6 c 322
2003-01-20 16:30:40 C 09 42 52.05 -34 40 32.1 c 322
2003-01-20 16:46:45 C 09 42 51.54 -34 40 29.7 c 322
2003-01-20 16:54:36 C 09 42 51.31 -34 40 28.9 c 322
2003-01-20 17:15:38 C 09 42 50.55 -34 40 25.7 c 322
2003-01-20 17:22:43 C 09 42 50.38 -34 40 24.7 c 322
2003-01-26 11:59:52 C 09 37 59.17 -33 57 32.4 e 428
2003-01-26 12:13:50 C 09 37 58.48 -33 57 26.4 e 428
2003-01-26 14:48:53 C 09 37 50.85 -33 56 14.3 e 428
2003-01-30 03:35:45 C 09 33 45.32 -33 04 25.7 c 809
2003-02-08 13:04:21 C 09 18 43.71 -28 33 47.9 e 428
2003-02-08 13:13:45 C 09 18 42.88 -28 33 31.8 e 428
2003-02-08 22:43:07 C 09 17 57.61 -28 17 09.4 939
2003-02-08 22:49:56 C 09 17 56.95 -28 16 59.1 939
2003-02-08 22:56:48 C 09 17 56.30 -28 16 48.9 939
2003-02-09 01:50:45 C 09 17 43.43 -28 11 00.8 d 809
2003-02-09 01:53:55 C 09 17 43.16 -28 10 55.1 d 809
2003-02-09 01:56:40 C 09 17 42.93 -28 10 50.5 d 809
2003-02-10 05:30:20 C 09 15 27.04 -27 19 01.1 o 644
2003-02-10 06:03:12 C 09 15 24.05 -27 17 56.8 o 644
2003-02-10 06:41:12 C 09 15 20.57 -27 16 42.0 o 644
2003-02-10 13:04:35 C 09 14 48.27 -27 03 25.1 e 428
2003-02-10 13:07:09 C 09 14 47.99 -27 03 19.6 e 428
2003-02-10 13:09:39 C 09 14 47.76 -27 03 14.6 e 428
2003-02-18 00:35:03 C 08 58 16.50 -19 05 54.9 d 809
2003-02-18 00:36:18 C 08 58 16.37 -19 05 50.7 d 809
2003-02-18 00:37:31 C 08 58 16.24 -19 05 46.8 d 809
2003-02-18 21:35:17 C 08 56 09.37 -17 54 12.6 d J95
2003-02-18 21:40:17 C 08 56 08.78 -17 53 56.0 d J95
2003-02-18 21:45:17 C 08 56 08.23 -17 53 38.0 d J95
2003-02-19 21:17:42 C 08 53 44.94 -16 27 50.9 c 240
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)