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
2003-03-03 21:18:00 C 08 23 08.69 +07 20 35.0 c 938
2003-03-03 21:20:12 C 08 23 08.43 +07 20 47.9 c 938
2003-03-03 21:22:21 C 08 23 08.20 +07 21 00.8 c 938
2003-03-03 21:24:33 C 08 23 07.95 +07 21 13.5 c 938
2003-03-03 22:16:09 C 08 23 01.90 +07 26 18.9 c 938
2003-03-03 22:18:20 C 08 23 01.66 +07 26 31.8 c 938
2003-03-03 22:20:30 C 08 23 01.37 +07 26 44.8 c 938
2003-03-03 22:22:41 C 08 23 01.15 +07 26 57.3 c 938
2003-03-03 22:24:50 C 08 23 00.91 +07 27 10.2 c 938
2003-03-04 02:23:47 C 08 22 36.27 +07 50 56.8 14.8 H72
2003-03-04 02:25:28 C 08 22 36.05 +07 51 07.1 14.8 H72
2003-03-04 02:27:04 C 08 22 35.83 +07 51 16.5 14.8 H72
2003-03-04 02:28:14 C 08 22 35.73 +07 51 24.3 14.9 H72
2003-03-04 02:30:01 C 08 22 35.48 +07 51 34.2 14.8 H72
2003-03-04 03:28:22 C 08 22 28.44 +07 57 09.5 c 842
2003-03-04 03:40:56 C 08 22 27.00 +07 58 22.9 c 842
2003-03-04 03:44:08 C 08 22 26.63 +07 58 42.0 c 842
2003-03-04 03:47:14 C 08 22 26.28 +07 58 59.9 c 842
2003-03-04 11:33:00 C 08 21 38.40 +08 45 13.7 m 379
2003-03-04 11:37:15 C 08 21 37.89 +08 45 38.8 m 379
2003-03-04 11:42:06 C 08 21 37.32 +08 46 07.8 m 379
2003-03-04 11:43:22 C 08 21 37.18 +08 46 15.5 m 379
2003-03-04 11:47:10 C 08 21 36.75 +08 46 38.0 m 379
2003-03-04 12:07:43 C 08 21 34.50 +08 48 40.9 m 300
2003-03-04 12:09:33 C 08 21 34.31 +08 48 52.4 m 300
2003-03-04 12:11:25 C 08 21 34.11 +08 49 03.6 m 300
2003-03-04 12:13:15 C 08 21 33.86 +08 49 14.4 m 300
2003-03-04 12:15:06 C 08 21 33.65 +08 49 25.0 m 300
2003-03-04 12:16:56 C 08 21 33.45 +08 49 36.3 m 300
2003-03-04 15:50:40 C 08 21 09.25 +09 11 41.6 c 322
2003-03-04 16:04:12 C 08 21 07.68 +09 13 02.2 c 322
2003-03-04 16:16:32 C 08 21 06.25 +09 14 15.3 c 322
2003-03-04 19:32:19 C 08 20 48.79 +09 32 48.3 J87
2003-03-04 19:38:02 C 08 20 48.17 +09 33 22.7 J87
2003-03-04 19:42:05 C 08 20 47.42 +09 33 47.4 d 170
2003-03-04 19:42:53 C 08 20 47.33 +09 33 52.0 d 170
2003-03-04 19:44:04 C 08 20 47.20 +09 33 59.0 d 170
2003-03-04 19:48:06 C 08 20 46.68 +09 34 23.3 d 170
2003-03-04 22:49:21 C 08 20 25.46 +09 52 23.7 a 233
2003-03-04 22:52:14 C 08 20 25.15 +09 52 40.8 a 233
2003-03-04 22:57:02 C 08 20 24.62 +09 53 09.5 a 233
2003-03-04 23:00:59 C 08 20 24.16 +09 53 33.1 a 233
2003-03-04 23:04:12 C 08 20 23.81 +09 53 52.1 a 233
2003-03-05 00:38:55 C 08 20 16.81 +10 03 35.4 14.7 c H72
2003-03-05 00:41:56 C 08 20 16.42 +10 03 53.7 14.7 c H72
2003-03-05 00:44:47 C 08 20 16.13 +10 04 10.8 14.7 c H72
2003-03-05 00:47:36 C 08 20 15.78 +10 04 26.6 14.6 c H72
2003-03-05 00:49:25 C 08 20 15.62 +10 04 37.5 14.6 c H72
2003-03-05 00:54:32 C 08 20 14.97 +10 05 08.5 14.6 c H72
2003-03-05 00:56:57 C 08 20 14.71 +10 05 22.9 14.6 c H72
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)