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
2003-03-06 06:00:45 C 08 17 10.49 +13 00 01.5 16.0 c 704
2003-03-06 06:02:50 C 08 17 10.84 +13 00 13.8 c 670
2003-03-06 06:19:31 C 08 17 08.32 +13 01 54.3 15.4 c 704
2003-03-06 06:38:15 C 08 17 06.28 +13 03 46.7 16.2 c 704
2003-03-06 07:31:10 C 08 17 00.70 +13 09 05.4 c 670
2003-03-07 02:19:58 C 08 15 06.34 +15 02 46.1 15.2 H72
2003-03-07 02:26:13 C 08 15 05.55 +15 03 23.8 15.3 H72
2003-03-07 02:30:52 C 08 15 05.01 +15 03 52.0 15.2 H72
2003-03-07 02:33:12 C 08 15 04.75 +15 04 06.0 15.1 H72
2003-03-07 04:13:34 C 08 14 54.50 +15 14 02.5 16.2 c 704
2003-03-07 04:32:26 C 08 14 52.34 +15 15 56.2 16.4 c 704
2003-03-07 04:51:32 C 08 14 50.16 +15 17 51.4 16.1 c 704
2003-03-07 05:10:41 C 08 14 47.96 +15 19 46.6 15.7 c 704
2003-03-07 05:29:55 C 08 14 45.76 +15 21 42.6 15.6 c 704
2003-03-07 12:36:02 C 08 14 02.66 +16 04 32.2 m 379
2003-03-07 12:38:38 C 08 14 02.40 +16 04 48.3 m 379
2003-03-07 12:49:27 C 08 14 01.16 +16 05 52.9 m 379
2003-03-07 20:06:35 C 08 13 17.58 +16 49 35.1 c 198
2003-03-07 20:09:51 C 08 13 17.27 +16 49 55.0 c 198
2003-03-07 20:12:02 C 08 13 17.03 +16 50 07.8 c 198
2003-03-07 20:17:27 C 08 13 16.40 +16 50 40.2 c 198
2003-03-07 20:23:27 C 08 13 15.76 +16 51 17.1 c 198
2003-03-08 05:36:47 C 08 12 18.59 +17 46 55.2 15.4 c 704
2003-03-08 05:55:54 C 08 12 16.46 +17 48 49.5 15.4 c 704
2003-03-08 06:14:53 C 08 12 14.35 +17 50 43.1 15.7 c 704
2003-03-08 06:33:37 C 08 12 12.25 +17 52 34.9 16.0 c 704
2003-03-08 06:52:34 C 08 12 10.15 +17 54 28.2 16.2 c 704
2003-03-08 19:09:34 C 08 10 59.41 +19 08 01.1 J87
2003-03-08 19:16:06 C 08 10 58.79 +19 08 40.3 J87
2003-03-08 19:22:37 C 08 10 58.01 +19 09 19.6 J87
2003-03-08 19:30:40 C 08 10 56.50 +19 10 03.6 c 151
2003-03-08 19:32:15 C 08 10 56.34 +19 10 13.3 c 151
2003-03-08 19:33:44 C 08 10 56.16 +19 10 22.1 c 151
2003-03-08 19:36:07 C 08 10 55.90 +19 10 36.2 c 151
2003-03-08 19:38:28 C 08 10 55.65 +19 10 50.4 c 151
2003-03-08 19:40:22 C 08 10 55.44 +19 11 01.9 c 151
2003-03-08 19:41:43 C 08 10 55.29 +19 11 10.0 c 151
2003-03-08 19:43:39 C 08 10 55.09 +19 11 21.8 c 151
2003-03-08 19:45:04 C 08 10 54.88 +19 11 29.8 c 151
2003-03-08 19:46:24 C 08 10 54.77 +19 11 37.8 c 151
2003-03-08 21:18:49 C 08 10 45.32 +19 20 56.7 c 938
2003-03-08 21:21:09 C 08 10 45.07 +19 21 10.6 c 938
2003-03-08 21:23:29 C 08 10 44.78 +19 21 24.8 c 938
2003-03-08 21:25:05 C 08 10 44.20 +19 21 32.8 d 232
2003-03-08 21:25:50 C 08 10 44.52 +19 21 38.7 c 938
2003-03-08 21:28:09 C 08 10 44.29 +19 21 52.5 c 938
2003-03-08 21:30:29 C 08 10 44.02 +19 22 06.3 c 938
2003-03-08 21:32:50 C 08 10 43.76 +19 22 20.4 c 938
2003-03-08 21:35:06 C 08 10 43.04 +19 22 32.9 d 232
2003-03-08 21:35:10 C 08 10 43.50 +19 22 34.3 c 938
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)