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
2003-02-25 20:41:24 C 08 38 39.13 -05 58 24.1 c 240
2003-02-25 20:41:40 C 08 38 39.13 -05 58 22.0 c 151
2003-02-25 20:42:42 C 08 38 38.52 -05 58 16.8 15.3 i 057
2003-02-25 20:43:04 C 08 38 38.94 -05 58 15.7 c 240
2003-02-25 20:43:29 C 08 38 38.89 -05 58 13.7 c 240
2003-02-25 20:43:53 C 08 38 38.83 -05 58 11.2 c 151
2003-02-25 20:44:12 C 08 38 38.81 -05 58 10.3 c 240
2003-02-25 20:45:18 C 08 38 38.68 -05 58 04.6 c 240
2003-02-25 20:45:42 C 08 38 38.64 -05 58 02.2 c 151
2003-02-25 20:45:44 C 08 38 38.08 -05 58 01.7 13.8 i 057
2003-02-25 20:47:30 C 08 38 38.42 -05 57 53.7 c 240
2003-02-25 20:48:04 C 08 38 38.36 -05 57 50.8 c 240
2003-02-25 20:48:17 C 08 38 38.29 -05 57 47.7 c 151
2003-02-25 20:48:19 C 08 38 37.70 -05 57 47.0 16.7 i 057
2003-02-25 20:48:36 C 08 38 38.30 -05 57 48.0 c 240
2003-02-25 20:49:44 C 08 38 38.17 -05 57 42.5 c 240
2003-02-25 20:49:50 C 08 38 38.16 -05 57 40.3 c 151
2003-02-25 20:50:29 C 08 38 37.48 -05 57 39.0 16.2 i 057
2003-02-25 20:50:51 C 08 38 38.04 -05 57 36.8 c 240
2003-02-25 20:51:11 C 08 38 38.00 -05 57 35.0 c 151
2003-02-25 20:51:57 C 08 38 37.91 -05 57 31.2 c 240
2003-02-25 21:26:28 C 08 38 33.84 -05 54 37.5 c 215
2003-02-25 21:27:19 C 08 38 33.72 -05 54 33.0 c 215
2003-02-25 21:28:04 C 08 38 33.65 -05 54 29.4 c 215
2003-02-26 19:30:05 C 08 36 12.46 -04 01 47.7 c 151
2003-02-26 19:31:28 C 08 36 12.33 -04 01 41.0 c 151
2003-02-26 19:33:36 C 08 36 12.10 -04 01 30.1 c 151
2003-02-26 19:36:48 C 08 36 11.71 -04 01 13.2 c 151
2003-02-26 19:39:51 C 08 36 11.36 -04 00 57.2 c 151
2003-02-26 19:40:30 C 08 36 11.20 -04 00 51.2 c 151
2003-02-26 19:41:49 C 08 36 11.07 -04 00 44.9 c 151
2003-02-26 19:43:31 C 08 36 10.95 -04 00 38.6 c 151
2003-02-26 19:49:28 C 08 36 10.24 -04 00 07.4 c 151
2003-02-26 19:50:33 C 08 36 10.10 -04 00 01.2 c 151
2003-02-26 19:56:49 C 08 36 09.40 -03 59 29.3 c 151
2003-02-26 19:59:51 C 08 36 09.04 -03 59 13.5 c 151
2003-02-27 00:57:54 C 08 35 37.77 -03 33 01.7 15.8 c H72
2003-02-27 00:59:31 C 08 35 37.60 -03 32 53.3 15.7 c H72
2003-02-27 01:13:26 C 08 35 35.87 -03 31 40.2 16.2 c H72
2003-02-27 01:17:16 C 08 35 35.49 -03 31 20.0 16.1 c H72
2003-02-27 03:01:16 C 08 35 23.12 -03 22 14.2 16.0 c H72
2003-02-27 03:03:40 C 08 35 22.82 -03 22 01.4 16.1 c H72
2003-02-27 03:05:17 C 08 35 22.70 -03 21 53.2 15.9 c H72
2003-02-27 03:07:37 C 08 35 22.40 -03 21 40.7 15.9 c H72
2003-02-27 03:11:46 C 08 35 21.89 -03 21 19.0 15.9 c H72
2003-02-27 03:13:13 C 08 35 21.67 -03 21 11.0 15.8 c H72
2003-02-27 12:37:01 C 08 34 21.20 -02 31 32.2 m 300
2003-02-27 12:48:19 C 08 34 19.87 -02 30 31.6 m 300
2003-02-27 12:59:41 C 08 34 18.51 -02 29 30.8 m 300
2003-02-27 13:11:01 C 08 34 17.18 -02 28 30.8 m 300
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)