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
2003-02-19 21:20:01 C 08 53 44.70 -16 27 41.4 c 204
2003-02-19 21:20:57 C 08 53 44.57 -16 27 38.9 c 240
2003-02-19 21:22:33 C 08 53 44.40 -16 27 33.0 c 240
2003-02-19 21:23:18 C 08 53 44.34 -16 27 29.2 c 204
2003-02-19 21:24:08 C 08 53 44.23 -16 27 27.3 c 240
2003-02-19 21:25:45 C 08 53 44.05 -16 27 20.8 c 240
2003-02-19 21:28:01 C 08 53 43.82 -16 27 11.7 c 204
2003-02-19 21:30:35 C 08 53 43.52 -16 27 02.9 c 240
2003-02-19 21:31:41 C 08 53 43.40 -16 26 57.9 c 204
2003-02-19 21:32:11 C 08 53 43.35 -16 26 56.7 c 240
2003-02-19 21:36:11 C 08 53 42.92 -16 26 40.7 c 204
2003-02-19 21:40:14 C 08 53 42.47 -16 26 25.8 c 204
2003-02-20 12:16:14 C 08 52 13.14 -15 30 38.8 m 379
2003-02-20 12:30:30 C 08 52 11.55 -15 29 43.6 m 379
2003-02-20 12:36:13 C 08 52 10.90 -15 29 21.3 m 379
2003-02-20 12:40:45 C 08 52 10.38 -15 29 04.0 m 379
2003-02-20 12:48:55 C 08 52 09.58 -15 28 32.0 m 300
2003-02-20 16:45:21 C 08 51 43.08 -15 13 06.1 m 300
2003-02-20 22:16:32 C 08 51 10.31 -14 51 26.7 c 587
2003-02-20 22:18:08 C 08 51 10.12 -14 51 20.3 c 587
2003-02-20 22:19:43 C 08 51 09.93 -14 51 14.1 c 587
2003-02-21 05:20:57 C 08 50 27.16 -14 23 02.6 c 670
2003-02-21 06:45:11 C 08 50 17.60 -14 17 22.8 c 670
2003-02-21 07:58:22 C 08 50 09.26 -14 12 25.5 c 670
2003-02-21 09:31:33 C 08 49 58.74 -14 06 04.7 c 670
2003-02-21 20:38:04 C 08 48 51.50 -13 20 24.1 c 198
2003-02-21 20:40:11 C 08 48 51.26 -13 20 16.0 c 198
2003-02-21 20:45:27 C 08 48 50.64 -13 19 54.1 c 198
2003-02-21 20:50:43 C 08 48 50.04 -13 19 32.4 c 198
2003-02-21 23:38:00 C 08 48 31.19 -13 07 50.4 c 204
2003-02-21 23:39:49 C 08 48 30.99 -13 07 42.7 c 204
2003-02-21 23:41:37 C 08 48 30.78 -13 07 35.0 c 204
2003-02-21 23:48:37 C 08 48 29.99 -13 07 05.6 c 204
2003-02-21 23:56:03 C 08 48 29.17 -13 06 34.4 c 204
2003-02-22 19:24:00 C 08 46 28.60 -11 43 02.7 c 185
2003-02-22 19:27:36 C 08 46 28.19 -11 42 46.9 c 185
2003-02-22 19:30:28 C 08 46 27.87 -11 42 34.5 c 185
2003-02-22 19:33:13 C 08 46 27.56 -11 42 22.4 c 185
2003-02-22 19:37:30 C 08 46 27.08 -11 42 03.6 c 185
2003-02-22 19:40:48 C 08 46 26.71 -11 41 49.5 c 185
2003-02-22 21:08:11 C 08 46 16.76 -11 35 27.6 c 198
2003-02-22 21:21:29 C 08 46 15.25 -11 34 29.0 c 198
2003-02-22 21:29:26 C 08 46 14.36 -11 33 54.2 c 198
2003-02-22 21:39:45 C 08 46 13.18 -11 33 08.7 c 198
2003-02-22 21:45:19 C 08 46 12.54 -11 32 44.2 c 198
2003-02-22 21:55:38 C 08 46 11.37 -11 31 59.0 c 198
2003-02-22 22:22:12 C 08 46 08.35 -11 30 03.8 c A18
2003-02-22 22:25:22 C 08 46 08.05 -11 29 48.5 c A18
2003-02-23 00:39:40 C 08 45 52.74 -11 19 53.7 c A18
2003-02-23 00:43:52 C 08 45 52.43 -11 19 37.6 c A18
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)