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
2003-04-14 19:15:07 C 07 06 43.80 +71 14 24.0 c 198
2003-04-14 19:33:55 C 07 06 42.15 +71 14 54.8 c 198
2003-04-14 19:49:47 C 07 06 40.79 +71 15 20.6 c 198
2003-04-14 19:57:42 C 07 06 40.07 +71 15 34.0 c 198
2003-04-18 19:58:20 C 06 58 41.04 +73 47 36.8 d 151
2003-04-18 20:06:52 C 06 58 40.05 +73 47 49.3 d 151
2003-04-18 20:08:32 C 06 58 39.91 +73 47 51.9 d 151
2003-04-18 20:10:13 C 06 58 39.74 +73 47 54.2 d 151
2003-04-18 20:14:01 C 06 58 39.27 +73 47 59.4 d 151
2003-04-18 20:15:38 C 06 58 39.19 +73 48 01.9 d 151
2003-04-20 20:06:19 C 06 53 47.70 +74 57 29.3 d 151
2003-04-20 20:07:39 C 06 53 47.40 +74 57 31.5 d 151
2003-04-20 20:09:29 C 06 53 47.20 +74 57 33.6 d 151
2003-04-20 20:11:28 C 06 53 47.14 +74 57 36.6 d 151
2003-04-20 20:13:24 C 06 53 46.87 +74 57 38.4 d 151
2003-04-20 20:14:34 C 06 53 46.59 +74 57 40.4 d 151
2003-04-20 20:16:37 C 06 53 46.38 +74 57 42.9 d 151
2003-04-20 20:18:28 C 06 53 46.24 +74 57 45.1 d 151
2003-06-01 22:20:19 C 01 20 51.94 +78 32 26.0 d 151
2003-06-01 22:23:01 C 01 20 51.67 +78 32 23.8 d 151
2003-06-01 22:25:18 C 01 20 51.23 +78 32 20.8 d 151
2003-06-01 22:28:29 C 01 20 50.96 +78 32 17.4 d 151
2003-06-01 22:32:58 C 01 20 50.54 +78 32 13.8 d 151
2003-06-20 22:02:02 C 01 23 03.91 +69 18 35.0 d 151
2003-06-20 22:03:07 C 01 23 03.93 +69 18 33.4 d 151
2003-06-20 22:04:10 C 01 23 03.98 +69 18 31.9 d 151
2003-06-20 22:07:47 C 01 23 04.49 +69 18 26.6 d 151
2003-06-20 22:10:36 C 01 23 04.50 +69 18 23.1 d 151
2003-07-24 02:23:05 C 02 49 21.28 +45 15 11.7 d 170
2003-07-24 02:23:46 C 02 49 21.36 +45 15 10.1 d 170
2003-07-24 02:25:03 C 02 49 21.50 +45 15 07.4 d 170
2003-08-04 01:29:43 C 03 19 53.96 +34 09 37.5 d 170
2003-08-04 01:30:50 C 03 19 54.07 +34 09 34.7 d 170
2003-08-04 01:33:04 C 03 19 54.29 +34 09 28.9 d 170
2003-08-04 01:35:19 C 03 19 54.54 +34 09 22.8 d 170
2003-08-04 23:56:11 C 03 22 23.88 +33 07 51.3 d 151
2003-08-04 23:58:41 C 03 22 24.22 +33 07 44.3 d 151
2003-08-04 23:59:28 C 03 22 24.34 +33 07 42.3 d 151
2003-08-05 00:01:36 C 03 22 24.59 +33 07 35.9 d 151
2003-08-05 00:59:22 C 03 22 30.89 +33 04 58.5 c 198
2003-08-05 01:04:47 C 03 22 31.47 +33 04 43.8 c 198
2003-08-05 01:07:04 C 03 22 31.72 +33 04 37.6 c 198
2003-08-05 01:09:48 C 03 22 32.00 +33 04 30.3 c 198
2003-08-05 01:14:51 C 03 22 32.55 +33 04 16.5 c 198
2003-08-09 01:47:14 C 03 33 04.48 +28 30 16.8 c 636
2003-08-09 01:50:55 C 03 33 04.88 +28 30 06.5 c 636
2003-08-09 01:53:01 C 03 33 05.13 +28 30 01.8 o 120
2003-08-23 10:01:28 C 04 06 53.75 +10 46 44.8 17.1 c 704
2003-08-23 10:19:45 C 04 06 55.27 +10 45 46.3 17.9 c 704
2003-08-23 10:37:46 C 04 06 56.79 +10 44 49.0 18.5 c 704
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)