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
2022-04-25 04:05:21 C 07 40 15.769 +45 16 08.33 V 703
2022-04-25 04:13:07 C 07 40 16.583 +45 16 19.56 V 703
2022-04-25 04:20:53 C 07 40 17.371 +45 16 28.92 V 703
2022-04-25 04:28:38 C 07 40 18.232 +45 16 40.12 V 703
2022-04-29 04:01:51 C 07 50 39.768 +47 24 28.15 V 703
2022-04-29 04:09:41 C 07 50 40.466 +47 24 37.26 V 703
2022-04-29 04:17:31 C 07 50 41.406 +47 24 47.77 V 703
2022-04-29 04:25:20 C 07 50 42.191 +47 24 56.74 V 703
2022-05-03 03:47:01 C 08 01 31.274 +49 25 17.26 V 703
2022-05-03 03:55:18 C 08 01 32.178 +49 25 26.87 V 703
2022-05-03 04:03:36 C 08 01 33.190 +49 25 36.84 V 703
2022-05-03 04:11:53 C 08 01 34.043 +49 25 46.88 V 703
2022-05-07 03:51:07 C 08 12 51.563 +51 19 53.47 V 703
2022-05-07 03:58:49 C 08 12 52.492 +51 20 02.04 V 703
2022-05-07 04:06:32 C 08 12 53.377 +51 20 11.11 V 703
2022-05-07 04:14:14 C 08 12 54.292 +51 20 19.72 V 703
2022-05-11 03:51:37 C 08 24 35.194 +53 08 25.33 V 703
2022-05-11 03:59:16 C 08 24 36.083 +53 08 33.22 V 703
2022-05-11 04:06:55 C 08 24 36.997 +53 08 40.85 V 703
2022-05-11 04:14:35 C 08 24 37.904 +53 08 49.56 V 703
2022-05-18 03:47:59 C 08 45 53.046 +56 05 19.25 V 703
2022-05-18 03:56:14 C 08 45 54.054 +56 05 28.43 V 703
2022-05-18 04:04:29 C 08 45 55.062 +56 05 35.70 V 703
2022-05-18 04:12:45 C 08 45 56.095 +56 05 43.40 V 703
2022-05-24 04:03:17 C 09 04 47.687 +58 25 32.99 V 703
2022-05-24 04:11:42 C 09 04 48.904 +58 25 41.34 V 703
2022-05-24 04:20:06 C 09 04 49.962 +58 25 48.40 V 703
2022-05-28 03:35:02 C 09 17 33.526 +59 53 10.82 V 703
2022-05-28 03:42:38 C 09 17 34.476 +59 53 16.69 V 703
2022-05-28 03:50:14 C 09 17 35.405 +59 53 23.57 V 703
2022-05-28 03:57:50 C 09 17 36.434 +59 53 30.73 V 703
2022-06-01 03:36:52 C 09 30 30.103 +61 17 30.98 V 703
2022-06-01 03:44:34 C 09 30 31.144 +61 17 36.67 V 703
2022-06-01 03:52:17 C 09 30 32.202 +61 17 43.12 V 703
2022-06-01 03:59:59 C 09 30 33.134 +61 17 48.98 V 703
2022-06-08 03:44:09 C 09 53 10.792 +63 37 35.54 V 703
2022-06-08 03:51:44 C 09 53 11.742 +63 37 41.30 V 703
2022-06-08 03:59:19 C 09 53 12.754 +63 37 46.27 V 703
2022-06-08 04:06:54 C 09 53 13.747 +63 37 52.79 V 703
2022-06-13 03:43:05 C 10 09 06.667 +65 12 48.96 V 703
2022-06-13 03:51:13 C 10 09 07.661 +65 12 53.57 V 703
2022-06-13 03:59:21 C 10 09 08.723 +65 12 59.47 V 703
2022-06-13 04:07:29 C 10 09 09.760 +65 13 05.02 V 703
2022-06-20 03:42:56 C 10 30 31.684 +67 20 54.02 V 703
2022-06-20 03:51:22 C 10 30 32.710 +67 21 00.47 V 703
2022-06-20 03:59:46 C 10 30 33.703 +67 21 05.90 V 703
2022-06-20 04:08:11 C 10 30 34.697 +67 21 12.28 V 703
2022-06-25 06:15:54 C 10 45 08.460 +68 51 32.18 V T05
2022-06-25 06:23:48 C 10 45 09.187 +68 51 37.91 V T05
2022-06-25 06:28:25 C 10 45 09.696 +68 51 40.46 V T05
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)