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
2003-03-08 21:37:30 C 08 10 43.23 +19 22 48.3 c 938
2003-03-08 21:39:50 C 08 10 42.96 +19 23 02.4 c 938
2003-03-08 21:40:19 C 08 10 42.47 +19 23 02.2 d 232
2003-03-08 21:42:12 C 08 10 42.72 +19 23 16.0 c 938
2003-03-08 21:44:32 C 08 10 42.49 +19 23 30.3 c 938
2003-03-08 21:50:15 C 08 10 41.39 +19 24 03.2 d 232
2003-03-08 22:00:34 C 08 10 39.98 +19 24 59.1 d A28
2003-03-08 22:06:59 C 08 10 39.27 +19 25 37.4 d A28
2003-03-08 22:12:00 C 08 10 38.73 +19 26 07.3 d A28
2003-03-08 22:14:59 C 08 10 38.39 +19 26 25.0 d A28
2003-03-08 22:19:34 C 08 10 37.90 +19 26 52.3 d A28
2003-03-08 22:23:29 C 08 10 37.47 +19 27 15.8 d A28
2003-03-09 11:43:09 C 08 09 19.26 +20 46 50.4 m 379
2003-03-09 11:44:46 C 08 09 19.10 +20 47 00.0 m 379
2003-03-09 11:49:41 C 08 09 18.54 +20 47 28.9 m 379
2003-03-09 11:52:58 C 08 09 18.20 +20 47 48.8 m 379
2003-03-09 11:55:12 C 08 09 17.95 +20 48 01.8 m 379
2003-03-09 20:06:49 C 08 08 29.50 +21 36 31.5 c 632
2003-03-09 20:22:21 C 08 08 27.81 +21 38 03.1 c 632
2003-03-09 23:03:21 C 08 08 10.75 +21 53 42.5 c 621
2003-03-09 23:04:54 C 08 08 10.59 +21 53 51.1 c 621
2003-03-09 23:15:25 C 08 08 09.49 +21 54 53.3 c 621
2003-03-09 23:16:56 C 08 08 09.32 +21 55 02.3 c 621
2003-03-09 23:18:29 C 08 08 09.18 +21 55 11.0 c 621
2003-03-10 12:51:16 C 08 06 50.52 +23 15 03.3 m 379
2003-03-10 12:55:03 C 08 06 50.04 +23 15 25.2 m 379
2003-03-10 13:00:07 C 08 06 49.54 +23 15 55.7 m 379
2003-03-10 13:02:33 C 08 06 49.28 +23 16 09.0 m 379
2003-03-10 18:40:03 C 08 06 18.49 +23 48 50.1 c 151
2003-03-10 18:41:34 C 08 06 18.33 +23 48 58.7 c 151
2003-03-10 18:43:22 C 08 06 18.11 +23 49 09.7 c 151
2003-03-10 18:44:47 C 08 06 17.96 +23 49 17.8 c 151
2003-03-10 18:46:53 C 08 06 17.77 +23 49 30.3 c 151
2003-03-10 18:48:27 C 08 06 17.62 +23 49 38.9 c 151
2003-03-10 18:49:47 C 08 06 17.44 +23 49 47.6 c 151
2003-03-10 18:51:13 C 08 06 17.26 +23 49 55.2 c 151
2003-03-10 18:52:33 C 08 06 17.13 +23 50 03.1 c 151
2003-03-10 18:53:47 C 08 06 16.98 +23 50 11.4 c 151
2003-03-10 18:55:42 C 08 06 16.81 +23 50 21.3 c 151
2003-03-10 18:56:42 C 08 06 16.68 +23 50 29.1 c 151
2003-03-10 20:37:27 C 08 06 05.93 +24 00 16.3 c 204
2003-03-10 20:45:47 C 08 06 05.04 +24 01 04.7 c 204
2003-03-10 20:50:49 C 08 06 04.49 +24 01 34.0 c 204
2003-03-10 20:59:23 C 08 06 03.58 +24 02 23.7 c 204
2003-03-10 21:07:45 C 08 06 02.68 +24 03 12.1 c 204
2003-03-11 19:18:44 C 08 03 56.70 +26 11 13.3 d 170
2003-03-11 19:19:16 C 08 03 56.56 +26 11 16.5 d 170
2003-03-11 19:20:21 C 08 03 56.49 +26 11 22.7 d 170
2003-03-12 12:29:49 C 08 02 17.84 +27 48 47.4 m 379
2003-03-12 13:06:25 C 08 02 13.99 +27 52 13.1 m 379
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)