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
2022-03-04 11:47:46 S 06 24 35.97 +02 07 33.8 L C51
2022-03-04 14:56:27 S 06 24 36.54 +02 16 24.5 L C51
2022-03-04 16:30:31 S 06 24 36.898 +02 20 49.49 L C51
2022-03-04 19:38:39 S 06 24 37.44 +02 29 38.6 L C51
2022-03-04 22:46:47 S 06 24 38.23 +02 38 26.3 L C51
2022-03-05 01:05:36 C 06 24 38.628 +02 45 09.83 V W68
2022-03-05 01:09:30 C 06 24 38.618 +02 45 21.10 V W68
2022-03-05 01:16:40 C 06 24 38.609 +02 45 41.04 V W68
2022-03-05 01:48:52 C 06 24 38.573 +02 47 11.11 V W68
2022-03-05 01:54:55 S 06 24 39.01 +02 47 15.1 L C51
2022-03-05 18:25:07 C 06 24 44.44 +03 33 15.2 X G02
2022-03-05 18:32:15 C 06 24 44.46 +03 33 35.1 X G02
2022-03-05 18:40:25 C 06 24 44.47 +03 33 58.0 X G02
2022-03-06 06:16:48 C 06 24 49.42 +04 06 32.0 V T05
2022-03-06 06:21:02 C 06 24 49.41 +04 06 43.9 V T05
2022-03-06 06:29:32 C 06 24 49.42 +04 07 07.5 V T05
2022-03-06 06:47:14 C 06 24 49.43 +04 07 57.0 V T05
2022-03-07 19:37:42 C 06 25 11.68 +05 50 01.5 X L63
2022-03-07 19:48:49 C 06 25 11.76 +05 50 32.2 X L63
2022-03-07 19:59:24 C 06 25 11.85 +05 51 01.4 X L63
2022-03-08 06:34:15 C 06 25 20.06 +06 20 18.3 V T08
2022-03-08 06:38:51 C 06 25 20.10 +06 20 30.9 V T08
2022-03-08 06:47:25 C 06 25 20.17 +06 20 54.6 V T08
2022-03-12 07:54:55 S 06 27 10.339 +10 43 21.11 L C51
2022-03-19 18:42:58 C 06 33 08.24 +18 16 55.2 V K83
2022-03-19 18:46:26 C 06 33 08.38 +18 17 03.2 V K83
2022-03-19 18:49:54 C 06 33 08.44 +18 17 11.8 V K83
2022-03-27 19:41:27 C 06 42 56.08 +25 37 47.9 V K74
2022-03-27 19:44:29 C 06 42 56.26 +25 37 54.8 V K74
2022-03-27 19:47:32 C 06 42 56.38 +25 38 00.8 V K74
2022-03-27 19:50:33 C 06 42 56.56 +25 38 07.4 V K74
2022-03-27 19:53:36 C 06 42 56.75 +25 38 14.1 V K74
2022-03-28 02:40:06 C 06 43 21.16 +25 52 52.1 V G96
2022-03-28 02:48:16 C 06 43 21.62 +25 53 09.4 V G96
2022-03-28 02:56:28 C 06 43 22.06 +25 53 26.9 V G96
2022-03-28 03:04:41 C 06 43 22.51 +25 53 44.4 V G96
2022-04-01 04:35:02 C 06 49 35.922 +29 15 48.74 V 703
2022-04-01 04:42:38 C 06 49 36.332 +29 16 03.58 V 703
2022-04-01 04:50:15 C 06 49 36.844 +29 16 18.80 V 703
2022-04-18 03:55:58 C 07 23 17.009 +41 11 46.90 V 703
2022-04-18 04:04:18 C 07 23 17.840 +41 11 59.24 V 703
2022-04-18 04:12:38 C 07 23 18.604 +41 12 12.38 V 703
2022-04-18 04:20:57 C 07 23 19.338 +41 12 25.20 V 703
2022-04-21 03:25:45 C 07 30 18.385 +42 58 53.98 V G96
2022-04-21 03:34:13 C 07 30 19.206 +42 59 05.96 V G96
2022-04-21 03:42:39 C 07 30 20.016 +42 59 18.17 V G96
2022-04-21 03:51:11 C 07 30 20.822 +42 59 30.55 V G96
2022-04-22 03:51:50 C 07 32 46.309 +43 34 23.59 V 703
2022-04-22 03:59:27 C 07 32 47.018 +43 34 34.39 V 703
2022-04-22 04:07:03 C 07 32 47.800 +43 34 45.34 V 703
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)