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
2003-03-20 21:55:03 C 07 45 03.67 +44 28 04.5 c 560
2003-03-20 22:45:05 C 07 44 59.45 +44 31 33.9 c 204
2003-03-20 22:46:53 C 07 44 59.27 +44 31 41.5 c 204
2003-03-20 22:48:41 C 07 44 59.14 +44 31 49.2 c 204
2003-03-20 22:50:29 C 07 44 58.98 +44 31 56.4 c 204
2003-03-20 22:52:17 C 07 44 58.82 +44 32 04.1 c 204
2003-03-20 22:54:04 C 07 44 58.68 +44 32 11.6 c 204
2003-03-20 22:55:52 C 07 44 58.53 +44 32 19.0 c 204
2003-03-20 22:57:39 C 07 44 58.41 +44 32 26.6 c 204
2003-03-20 22:59:27 C 07 44 58.25 +44 32 33.9 c 204
2003-03-20 23:01:14 C 07 44 58.08 +44 32 41.4 c 204
2003-03-21 19:16:27 C 07 43 27.10 +45 57 07.0 c 639
2003-03-21 19:29:20 C 07 43 26.08 +45 58 00.6 c 639
2003-03-21 19:36:04 C 07 43 25.47 +45 58 28.2 c 639
2003-03-21 19:43:08 C 07 43 24.85 +45 58 56.4 c 639
2003-03-22 19:36:54 C 07 41 37.95 +47 34 45.2 16.0 c 153
2003-03-22 20:22:03 C 07 41 34.06 +47 37 41.2 15.6 c 153
2003-03-22 20:58:48 C 07 41 31.02 +47 40 03.7 15.8 c 153
2003-03-23 04:16:29 C 07 40 58.94 +48 08 38.6 17.1 c 704
2003-03-23 04:34:57 C 07 40 57.35 +48 09 48.9 17.0 c 704
2003-03-23 04:53:22 C 07 40 55.78 +48 10 58.9 17.3 c 704
2003-03-23 05:11:45 C 07 40 54.16 +48 12 09.6 17.4 c 704
2003-03-23 05:30:14 C 07 40 52.66 +48 13 19.2 16.8 c 704
2003-03-23 18:58:50 C 07 39 56.05 +49 04 38.8 16.3 c 153
2003-03-23 19:13:18 C 07 39 54.86 +49 05 33.5 d 151
2003-03-23 19:14:02 C 07 39 54.80 +49 05 36.0 d 151
2003-03-23 19:14:39 C 07 39 54.76 +49 05 38.5 d 151
2003-03-23 19:15:21 C 07 39 54.69 +49 05 41.2 d 151
2003-03-23 19:15:57 C 07 39 54.58 +49 05 43.6 16.7 c 153
2003-03-23 19:16:01 C 07 39 54.66 +49 05 43.7 d 151
2003-03-23 19:16:57 C 07 39 54.57 +49 05 47.2 d 151
2003-03-23 19:17:36 C 07 39 54.53 +49 05 49.7 d 151
2003-03-23 19:18:08 C 07 39 54.46 +49 05 51.7 d 151
2003-03-23 19:18:46 C 07 39 54.41 +49 05 54.1 d 151
2003-03-23 19:19:23 C 07 39 54.35 +49 05 56.5 d 151
2003-03-23 19:28:36 C 07 39 53.52 +49 06 29.9 16.8 c 153
2003-03-23 19:47:08 C 07 39 52.05 +49 07 39.5 16.6 c 153
2003-03-23 20:10:58 C 07 39 49.84 +49 09 10.6 16.6 A30
2003-03-23 20:15:12 C 07 39 49.52 +49 09 26.0 A30
2003-03-23 20:32:49 C 07 39 48.07 +49 10 31.8 A30
2003-03-23 20:37:18 C 07 39 47.65 +49 10 48.4 A30
2003-03-23 20:39:42 C 07 39 47.69 +49 10 56.1 c 198
2003-03-23 20:41:35 C 07 39 47.29 +49 11 03.8 16.4 A30
2003-03-23 20:41:48 C 07 39 47.51 +49 11 03.7 c 198
2003-03-23 20:44:58 C 07 39 47.25 +49 11 15.6 c 198
2003-03-23 20:58:38 C 07 39 46.11 +49 12 06.0 c 198
2003-03-23 21:00:45 C 07 39 45.94 +49 12 14.1 c 198
2003-03-24 18:52:00 C 07 38 14.10 +50 32 49.4 d 151
2003-03-24 18:53:30 C 07 38 14.03 +50 32 54.9 d 151
2003-03-24 18:54:29 C 07 38 13.91 +50 32 58.8 d 151
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)