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
2016-02-25 13:41:16 S 05 23 12.62 -06 21 18.3 L C51
2016-02-25 15:15:42 S 05 23 16.04 -06 18 16.9 L C51
2016-02-25 16:49:57 S 05 23 19.59 -06 15 15.0 L C51
2016-02-25 16:50:07 S 05 23 19.54 -06 15 17.2 L C51
2016-02-25 18:34:43 C 05 23 23.19 -06 11 49.8 o K95
2016-02-25 18:39:53 C 05 23 23.38 -06 11 39.5 o K95
2016-02-25 21:33:15 S 05 23 30.031 -06 06 12.92 L C51
2016-02-26 00:41:56 S 05 23 37.205 -06 00 15.30 L C51
2016-02-26 00:42:07 S 05 23 37.205 -06 00 15.34 L C51
2016-02-26 06:59:40 S 05 23 51.497 -05 48 12.60 L C51
2016-03-01 02:23:41 C 05 27 40.82 -02 55 18.8 R G45
2016-03-01 02:30:14 C 05 27 41.10 -02 55 06.2 R G45
2016-03-01 02:37:33 C 05 27 41.40 -02 54 52.6 R G45
2016-03-01 02:44:24 C 05 27 41.68 -02 54 39.9 R G45
2016-03-01 02:51:46 C 05 27 42.00 -02 54 26.0 R G45
2016-03-01 02:56:43 C 05 27 42.21 -02 54 16.7 R G45
2016-03-01 03:04:12 C 05 27 42.51 -02 54 02.6 R G45
2016-03-01 03:11:31 C 05 27 42.83 -02 53 48.8 R G45
2016-03-01 03:40:52 C 05 27 44.10 -02 52 53.6 q 703
2016-03-01 03:48:06 C 05 27 44.46 -02 52 39.8 q 703
2016-03-01 03:55:19 C 05 27 44.71 -02 52 26.3 q 703
2016-03-01 04:02:34 C 05 27 45.06 -02 52 11.9 q 703
2016-03-01 20:38:04 C 05 28 30.94 -02 21 12.1 q 160
2016-03-01 20:41:03 C 05 28 31.08 -02 21 06.5 q 160
2016-03-01 20:44:01 C 05 28 31.20 -02 21 00.8 q 160
2016-03-02 05:48:13 C 05 28 57.191 -02 04 00.88 L F51
2016-03-02 06:08:21 C 05 28 58.072 -02 03 23.33 L F51
2016-03-02 06:28:22 C 05 28 58.949 -02 02 46.02 L F51
2016-03-03 20:29:11 C 05 30 50.53 -00 52 20.1 q 160
2016-03-03 20:32:11 C 05 30 50.67 -00 52 14.2 q 160
2016-03-05 06:11:45 C 05 32 35.186 +00 09 41.50 L F51
2016-03-05 06:28:56 C 05 32 36.033 +00 10 12.97 L F51
2016-03-05 07:03:12 C 05 32 37.730 +00 11 15.61 L F51
2016-04-23 05:40:57 C 07 16 13.234 +28 31 59.09 L F51
2016-04-23 05:52:33 C 07 16 14.574 +28 32 11.16 L F51
2016-05-13 03:27:30 C 08 17 22.32 +35 38 42.7 q 703
2016-05-13 03:33:59 C 08 17 23.21 +35 38 47.8 q 703
2016-05-13 04:01:07 C 08 17 26.98 +35 39 06.8 q 703
2016-08-25 19:01:57 C 15 07 50.31 +19 15 14.2 S B38
2016-08-25 19:17:53 C 15 07 53.64 +19 14 21.9 S B38
2016-08-25 19:27:57 C 15 07 55.73 +19 13 48.4 S B38
2016-08-25 19:38:32 C 15 07 57.88 +19 13 14.2 S B38
2016-08-25 19:47:35 C 15 07 59.75 +19 12 43.7 S B38
2016-08-26 05:46:29 C 15 10 06.40 +18 39 50.4 L T05
2016-08-26 05:50:55 C 15 10 07.31 +18 39 34.9 L T05
2016-08-26 05:59:14 C 15 10 09.02 +18 39 06.5 L T05
2016-08-26 06:11:13 C 15 10 11.52 +18 38 25.8 L T05
2016-09-07 05:48:02 C 16 17 16.60 -01 37 51.6 L T05
2016-09-07 05:52:22 C 16 17 17.64 -01 38 13.7 L T05
2016-09-07 05:54:36 C 16 17 18.24 -01 38 24.9 L 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)