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
2022-09-03 01:48:50 C 03 14 51.85 +00 45 08.7 V L65
2022-09-03 02:26:02 C 03 14 44.80 +00 33 17.3 V L65
2022-09-03 02:59:47 C 03 14 38.33 +00 22 33.2 V L65
2022-09-04 02:01:05 C 03 10 56.20 -06 40 16.6 V L65
2022-09-04 02:11:04 C 03 10 54.39 -06 43 12.6 V L65
2022-09-04 02:21:06 C 03 10 52.58 -06 46 08.9 V L65
2022-09-04 13:10:36 C 03 09 12.612 -09 50 57.62 V T08
2022-09-04 13:13:13 C 03 09 12.110 -09 51 41.65 V T08
2022-09-04 13:17:09 C 03 09 11.364 -09 52 47.71 V T08
2022-09-04 13:25:41 C 03 09 09.737 -09 55 10.85 V T08
2022-09-04 15:19:52 C 03 08 47.806 -10 26 54.46 V T08
2022-09-06 02:28:06 C 03 03 36.982 -19 19 21.36 V M22
2022-09-06 02:33:21 C 03 03 36.046 -19 20 34.26 V M22
2022-09-06 02:42:08 C 03 03 34.502 -19 22 35.29 V M22
2022-09-06 02:56:32 C 03 03 31.954 -19 25 53.76 V M22
2022-09-07 13:06:07 C 02 58 49.025 -26 34 43.32 U F51
2022-09-07 13:23:17 C 02 58 46.121 -26 37 57.78 U F51
2022-09-07 13:40:32 C 02 58 43.191 -26 41 12.62 U F51
2022-09-08 02:58:56 C 02 57 01.28 -29 03 26.7 q Y00
2022-09-08 03:00:24 C 02 57 01.04 -29 03 42.1 q Y00
2022-09-08 03:01:52 C 02 57 00.80 -29 03 57.8 q Y00
2022-09-08 23:59:33 C 02 54 13.445 -32 28 01.96 V M22
2022-09-09 00:02:10 C 02 54 13.044 -32 28 26.11 V M22
2022-09-09 00:06:45 C 02 54 12.334 -32 29 08.48 V M22
2022-09-09 00:32:09 C 02 54 08.390 -32 33 02.81 V M22
2022-09-09 22:28:47 C 02 51 23.237 -35 39 56.02 V M22
2022-09-09 22:31:25 C 02 51 22.860 -35 40 17.44 V M22
2022-09-09 22:54:11 C 02 51 19.598 -35 43 22.55 V M22
2022-09-09 23:04:46 C 02 51 18.065 -35 44 48.37 V M22
2022-09-11 03:33:00 C 02 47 47.49 -39 12 56.8 q 834
2022-09-11 04:21:45 C 02 47 40.71 -39 18 31.5 q 834
2022-09-15 04:02:59 C 02 36 32.37 -47 34 28.7 q X33
2022-09-15 04:06:39 C 02 36 32.01 -47 34 46.0 q X33
2022-09-15 04:11:39 C 02 36 31.28 -47 35 05.7 q X33
2022-09-16 00:32:39 C 02 34 11.978 -48 51 12.89 V M22
2022-09-16 00:35:54 C 02 34 11.542 -48 51 24.66 V M22
2022-09-16 00:40:28 C 02 34 10.925 -48 51 41.11 V M22
2022-09-16 00:49:02 C 02 34 09.773 -48 52 11.89 V M22
2022-09-26 07:18:27 C 02 08 30.211 -57 26 56.83 V W68
2022-09-26 07:22:59 C 02 08 29.666 -57 27 01.62 V W68
2022-09-26 07:54:32 C 02 08 26.028 -57 27 35.28 V W68
2022-09-26 08:03:12 C 02 08 25.039 -57 27 44.42 V W68
2022-09-27 23:14:59 C 02 04 41.846 -58 07 01.16 V M22
2022-09-27 23:17:37 C 02 04 41.563 -58 07 03.50 V M22
2022-09-27 23:22:51 C 02 04 40.973 -58 07 08.40 V M22
2022-09-27 23:31:20 C 02 04 40.015 -58 07 16.32 V M22
2022-10-01 01:14:14 C 01 57 54.42 -59 02 13.9 q 834
2022-10-01 02:07:45 C 01 57 49.03 -59 02 50.5 q 834
2022-10-01 23:04:41 C 01 55 55.690 -59 14 46.86 V M22
2022-10-01 23:07:56 C 01 55 55.356 -59 14 48.59 V M22
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)