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
2022-01-24 10:14:38 C 07 15 09.49 -34 11 13.3 V T08
2022-01-24 22:54:12 C 07 13 56.19 -33 55 23.2 V M22
2022-01-24 22:58:23 C 07 13 55.78 -33 55 18.4 V M22
2022-01-24 23:08:04 C 07 13 54.78 -33 55 05.9 V M22
2022-01-24 23:27:02 C 07 13 52.87 -33 54 42.3 V M22
2022-01-30 03:44:19 C 07 02 13.966 -30 55 56.28 V W68
2022-01-30 04:20:40 C 07 02 10.457 -30 54 56.81 V W68
2022-01-30 04:24:47 C 07 02 10.070 -30 54 50.08 V W68
2022-01-30 04:39:49 C 07 02 08.602 -30 54 25.56 V W68
2022-02-10 02:06:14 C 06 41 27.91 -22 11 13.3 V W46
2022-02-10 02:37:33 C 06 41 25.69 -22 10 00.1 V W46
2022-02-10 02:46:14 C 06 41 25.08 -22 09 39.6 V W46
2022-02-12 06:47:53 C 06 38 11.35 -20 04 32.3 V T08
2022-02-12 07:39:25 C 06 38 07.98 -20 02 25.5 V T08
2022-02-12 08:15:36 C 06 38 05.62 -20 00 56.5 V T08
2022-02-12 19:29:29 C 06 37 26.87 -19 33 18.7 X K74
2022-02-12 19:33:56 C 06 37 26.57 -19 33 05.2 X K74
2022-02-12 19:33:56 C 06 37 26.57 -19 33 09.2 X K74
2022-02-12 19:38:23 C 06 37 26.43 -19 32 51.3 X K74
2022-02-14 10:23:01 C 06 35 18.10 -17 54 40.4 q E89
2022-02-14 10:30:32 C 06 35 17.69 -17 54 21.6 q E89
2022-02-15 19:00:45 C 06 33 40.01 -16 30 43.8 X K74
2022-02-15 19:05:12 C 06 33 39.75 -16 30 31.8 X K74
2022-02-15 19:09:38 C 06 33 39.54 -16 30 20.4 X K74
2022-02-19 19:09:10 C 06 29 36.60 -12 12 39.6 X K74
2022-02-19 19:11:57 C 06 29 36.48 -12 12 31.9 X K74
2022-02-19 19:14:11 C 06 29 36.38 -12 12 25.5 X K74
2022-02-19 19:16:25 C 06 29 36.28 -12 12 19.4 X K74
2022-02-22 07:19:13 C 06 27 40.38 -09 25 35.0 V T05
2022-02-22 07:23:50 C 06 27 40.22 -09 25 22.0 V T05
2022-02-22 07:48:52 C 06 27 39.37 -09 24 11.7 V T05
2022-02-23 17:56:38 C 06 26 47.12 -07 48 19.5 V K83
2022-02-23 17:58:08 C 06 26 47.06 -07 48 15.4 V K83
2022-02-23 17:59:37 C 06 26 47.01 -07 48 11.4 V K83
2022-02-24 05:45:51 C 06 26 30.69 -07 14 48.6 V T08
2022-02-24 05:49:08 C 06 26 30.59 -07 14 39.2 V T08
2022-02-24 05:53:44 C 06 26 30.46 -07 14 26.3 V T08
2022-02-24 06:31:45 C 06 26 29.40 -07 12 38.5 V T08
2022-02-25 01:09:19 C 06 26 05.904 -06 19 33.31 V W68
2022-02-25 01:14:30 C 06 26 05.779 -06 19 18.84 V W68
2022-02-25 01:21:38 C 06 26 05.599 -06 18 58.43 V W68
2022-02-25 01:36:00 C 06 26 05.230 -06 18 17.71 V W68
2022-02-26 18:35:18 C 06 25 23.79 -04 22 14.0 V 130
2022-02-26 18:38:53 C 06 25 23.78 -04 22 04.0 V 130
2022-02-26 18:42:49 C 06 25 23.68 -04 21 52.7 V 130
2022-02-28 05:24:15 C 06 24 58.46 -02 42 56.9 V T08
2022-02-28 05:26:53 C 06 24 58.43 -02 42 49.5 V T08
2022-02-28 05:32:08 C 06 24 58.34 -02 42 34.6 V T08
2022-02-28 05:46:34 C 06 24 58.10 -02 41 53.5 V T08
2022-03-04 08:40:11 S 06 24 35.50 +01 58 45.2 L C51
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)