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
2022-10-28 04:38:59 C 01 19 04.627 -57 50 32.50 V W68
2022-10-28 04:50:45 C 01 19 04.224 -57 50 25.69 V W68
2022-10-28 05:02:41 C 01 19 03.773 -57 50 18.38 V W68
2022-10-29 21:08:59 C 01 18 03.785 -57 26 49.88 V M22
2022-10-29 21:13:44 C 01 18 03.646 -57 26 47.22 V M22
2022-10-29 21:22:28 C 01 18 03.389 -57 26 41.82 V M22
2022-10-29 22:13:15 C 01 18 01.750 -57 26 10.72 V M22
2022-10-29 22:17:51 C 01 18 01.618 -57 26 07.87 V M22
2022-10-29 22:22:26 C 01 18 01.488 -57 26 05.28 V M22
2022-10-29 22:32:50 C 01 18 01.159 -57 25 58.69 V M22
2022-10-29 23:22:57 C 01 17 59.597 -57 25 27.16 V M22
2022-11-01 03:53:49 C 01 16 55.622 -56 52 32.66 V W68
2022-11-01 03:59:00 C 01 16 55.517 -56 52 28.88 V W68
2022-11-01 04:06:49 C 01 16 55.262 -56 52 23.88 V W68
2022-11-01 04:54:27 C 01 16 54.058 -56 51 52.34 V W68
2022-11-05 04:02:03 C 01 15 37.164 -55 46 42.53 V W68
2022-11-05 04:05:57 C 01 15 37.126 -55 46 39.90 V W68
2022-11-05 04:15:44 C 01 15 36.936 -55 46 32.59 V W68
2022-11-05 04:36:09 C 01 15 36.595 -55 46 17.76 V W68
2022-11-10 21:39:14 C 01 15 08.114 -54 01 45.44 V M22
2022-11-10 21:43:47 C 01 15 08.021 -54 01 42.02 V M22
2022-11-10 21:53:00 C 01 15 07.990 -54 01 34.46 V M22
2022-11-10 22:08:08 C 01 15 07.956 -54 01 22.04 V M22
2022-11-14 20:45:03 C 01 15 39.557 -52 42 51.91 V M22
2022-11-14 20:49:37 C 01 15 39.588 -52 42 47.99 V M22
2022-11-14 20:57:26 C 01 15 39.602 -52 42 41.76 V M22
2022-11-14 21:12:46 C 01 15 39.617 -52 42 28.62 V M22
2022-11-17 02:45:32 C 01 16 14.455 -51 55 59.52 V W68
2022-11-17 02:49:56 C 01 16 14.479 -51 55 54.77 V W68
2022-11-17 02:57:09 C 01 16 14.563 -51 55 49.62 V W68
2022-11-17 19:42:46 S 01 16 28.334 -51 40 52.86 L C51
2022-11-17 22:50:21 S 01 16 30.962 -51 38 06.00 L C51
2022-11-18 16:02:32 S 01 16 45.917 -51 22 42.31 L C51
2022-11-19 09:14:42 S 01 17 01.934 -51 07 12.76 L C51
2022-11-19 10:48:35 S 01 17 03.478 -51 05 44.95 L C51
2022-11-19 20:11:42 S 01 17 12.749 -50 57 13.61 L C51
2022-11-20 05:34:38 S 01 17 22.668 -50 48 39.10 L C51
2022-11-21 03:16:59 C 01 17 45.658 -50 28 45.23 V W68
2022-11-21 03:21:33 C 01 17 45.744 -50 28 40.91 V W68
2022-11-21 03:30:02 C 01 17 45.850 -50 28 32.77 V W68
2022-11-21 03:46:18 C 01 17 46.063 -50 28 17.44 V W68
2022-11-22 20:29:06 C 01 18 35.702 -49 50 15.83 V M22
2022-11-22 20:33:44 C 01 18 35.767 -49 50 11.29 V M22
2022-11-22 20:42:11 C 01 18 35.921 -49 50 03.23 V M22
2022-11-22 20:56:32 C 01 18 36.144 -49 49 49.98 V M22
2022-11-26 20:20:13 C 01 20 55.282 -48 18 05.22 V M22
2022-11-26 20:24:46 C 01 20 55.366 -48 18 00.50 V M22
2022-11-26 20:32:38 C 01 20 55.579 -48 17 53.12 V M22
2022-11-26 20:48:16 C 01 20 55.951 -48 17 37.90 V M22
2022-11-29 02:26:48 C 01 22 28.070 -47 24 35.21 V W68
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)