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
2022-10-01 23:12:29 C 01 55 54.893 -59 14 51.14 V M22
2022-10-01 23:20:20 C 01 55 54.070 -59 14 55.36 V M22
2022-10-03 02:26:57 C 01 53 35.51 -59 27 56.1 V W94
2022-10-03 02:35:49 C 01 53 34.66 -59 28 00.8 V W94
2022-10-03 02:44:42 C 01 53 33.80 -59 28 05.4 V W94
2022-10-04 06:40:17 C 01 51 08.746 -59 39 12.38 V W68
2022-10-04 07:12:16 C 01 51 05.575 -59 39 22.75 V W68
2022-10-04 07:16:54 C 01 51 05.134 -59 39 24.08 V W68
2022-10-04 07:25:31 C 01 51 04.310 -59 39 26.75 V W68
2022-10-05 22:47:59 C 01 47 54.146 -59 51 14.90 V M22
2022-10-05 23:16:05 C 01 47 51.492 -59 51 22.14 V M22
2022-10-05 23:22:56 C 01 47 50.830 -59 51 23.76 V M22
2022-10-05 23:32:59 C 01 47 49.879 -59 51 26.46 V M22
2022-10-08 04:00:37 C 01 43 48.120 -60 00 58.07 V W68
2022-10-08 04:04:31 C 01 43 47.762 -60 00 58.72 V W68
2022-10-08 04:34:46 C 01 43 45.079 -60 01 03.32 V W68
2022-10-08 05:00:48 C 01 43 42.763 -60 01 06.46 V W68
2022-10-12 05:33:29 C 01 36 55.610 -60 03 01.08 V W68
2022-10-12 05:38:03 C 01 36 55.231 -60 03 00.94 V W68
2022-10-12 05:45:57 C 01 36 54.614 -60 03 00.14 V W68
2022-10-12 06:39:16 C 01 36 50.441 -60 02 54.82 V W68
2022-10-13 21:49:14 C 01 34 22.975 -59 58 41.38 V M22
2022-10-13 21:53:10 C 01 34 22.670 -59 58 41.05 V M22
2022-10-13 22:26:47 C 01 34 20.201 -59 58 36.44 V M22
2022-10-13 22:34:35 C 01 34 19.622 -59 58 35.47 V M22
2022-10-16 04:03:21 C 01 31 10.618 -59 48 43.45 V W68
2022-10-16 04:19:08 C 01 31 09.540 -59 48 40.14 V W68
2022-10-16 04:21:45 C 01 31 09.353 -59 48 39.46 V W68
2022-10-16 04:26:17 C 01 31 09.038 -59 48 38.59 V W68
2022-10-17 22:23:53 C 01 28 52.337 -59 37 51.46 V M22
2022-10-17 22:29:07 C 01 28 51.972 -59 37 50.05 V M22
2022-10-17 22:41:40 C 01 28 51.194 -59 37 46.45 V M22
2022-10-17 22:57:28 C 01 28 50.167 -59 37 41.81 V M22
2022-10-20 04:27:47 C 01 26 11.786 -59 20 26.20 V W68
2022-10-20 04:32:58 C 01 26 11.484 -59 20 24.18 V W68
2022-10-20 04:42:05 C 01 26 10.951 -59 20 20.90 V W68
2022-10-20 04:57:48 C 01 26 10.049 -59 20 15.00 V W68
2022-10-21 21:05:18 C 01 24 23.542 -59 04 51.92 V M22
2022-10-21 21:09:15 C 01 24 23.354 -59 04 50.38 V M22
2022-10-21 21:15:59 C 01 24 23.004 -59 04 47.75 V M22
2022-10-21 21:47:34 C 01 24 21.329 -59 04 35.11 V M22
2022-10-24 03:18:40 C 01 22 13.603 -58 41 05.68 V W68
2022-10-24 03:22:34 C 01 22 13.426 -58 41 03.80 V W68
2022-10-24 03:56:29 C 01 22 11.858 -58 40 48.18 V W68
2022-10-24 04:01:41 C 01 22 11.611 -58 40 45.70 V W68
2022-10-25 22:19:20 C 01 20 42.720 -58 19 55.81 V M22
2022-10-25 22:23:19 C 01 20 42.598 -58 19 53.54 V M22
2022-10-25 22:31:32 C 01 20 42.158 -58 19 50.09 V M22
2022-10-25 22:45:21 C 01 20 41.647 -58 19 41.84 V M22
2022-10-28 03:57:48 C 01 19 06.120 -57 50 56.18 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)