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
2022-06-25 06:41:36 C 10 45 11.009 +68 51 49.39 V T05
2022-06-25 06:46:12 C 10 45 11.510 +68 51 52.70 V T05
2022-06-25 06:46:52 C 10 45 11.638 +68 51 53.24 V T05
2022-06-25 06:55:25 C 10 45 12.521 +68 51 59.00 V T05
2022-07-09 06:41:58 C 11 17 13.452 +72 57 07.44 U F52
2022-07-09 07:02:34 C 11 17 14.692 +72 57 21.13 U F52
2022-07-09 07:12:48 C 11 17 15.302 +72 57 27.92 U F52
2022-07-29 21:41:32 C 11 01 26.59 +79 27 57.5 V C23
2022-07-29 21:44:47 C 11 01 25.72 +79 28 01.4 V C23
2022-07-29 21:49:05 C 11 01 24.94 +79 28 04.3 V C23
2022-08-02 20:52:02 C 10 31 56.97 +80 44 59.1 V C23
2022-08-02 20:58:16 C 10 31 54.34 +80 45 03.1 V C23
2022-08-02 21:04:30 C 10 31 51.93 +80 45 07.6 V C23
2022-08-04 22:14:29 C 10 08 22.092 +81 20 34.62 V Z80
2022-08-04 22:15:47 C 10 08 21.300 +81 20 35.30 V Z80
2022-08-05 20:44:38 C 09 55 07.64 +81 34 52.6 V C23
2022-08-05 20:48:57 C 09 55 04.79 +81 34 54.8 V C23
2022-08-05 20:53:16 C 09 55 02.48 +81 34 57.2 V C23
2022-08-05 22:34:56 C 09 54 01.474 +81 35 51.04 V Z80
2022-08-05 22:42:03 C 09 53 57.187 +81 35 54.64 V Z80
2022-08-05 22:49:10 C 09 53 53.136 +81 35 58.52 V Z80
2022-08-08 22:23:29 C 08 59 33.653 +82 04 50.70 V Z37
2022-08-08 22:28:45 C 08 59 29.258 +82 04 51.38 V Z37
2022-08-08 22:34:12 C 08 59 24.655 +82 04 52.03 V Z37
2022-08-10 22:48:48 C 08 13 13.378 +82 01 54.41 V Z37
2022-08-10 22:54:56 C 08 13 07.603 +82 01 52.57 V Z37
2022-08-10 23:01:03 C 08 13 01.603 +82 01 50.45 V Z37
2022-08-15 18:09:50 C 06 15 59.31 +79 47 03.3 q 168
2022-08-15 20:35:55 C 06 13 52.03 +79 41 57.5 q 168
2022-08-15 22:33:54 C 06 12 06.98 +79 37 51.1 q 168
2022-08-18 19:21:50 C 05 17 45.94 +76 12 43.1 q 168
2022-08-18 19:49:54 C 05 17 27.60 +76 11 01.2 q 168
2022-08-18 20:05:58 C 05 17 17.09 +76 10 02.8 q 168
2022-08-19 01:14:23 C 05 13 53.56 +75 50 48.0 V L18
2022-08-19 01:15:52 C 05 13 52.68 +75 50 42.5 V L18
2022-08-19 01:17:21 C 05 13 51.57 +75 50 37.0 V L18
2022-08-19 01:18:50 C 05 13 50.58 +75 50 31.5 V L18
2022-08-19 01:20:19 C 05 13 49.62 +75 50 25.9 V L18
2022-08-19 18:03:36 C 05 03 11.26 +74 40 16.4 q 168
2022-08-19 20:30:39 C 05 01 45.73 +74 29 50.3 q 168
2022-08-19 21:47:43 C 05 00 59.71 +74 24 19.9 q 168
2022-08-19 22:09:37 C 05 00 44.779 +74 22 04.12 V Z80
2022-08-19 22:13:41 C 05 00 42.509 +74 21 46.26 V Z80
2022-08-19 22:17:46 C 05 00 40.246 +74 21 28.51 V Z80
2022-08-20 23:38:19 C 04 46 31.654 +72 18 13.46 V Z80
2022-08-20 23:41:22 C 04 46 30.250 +72 17 57.91 V Z80
2022-08-20 23:44:25 C 04 46 28.622 +72 17 42.50 V Z80
2022-08-21 02:41:40 C 04 44 55.49 +72 02 46.7 t B66
2022-08-21 03:09:16 C 04 44 40.19 +72 00 23.3 t B66
2022-08-21 18:15:38 C 04 37 07.00 +70 33 54.4 q 168
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)