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
2003-02-27 21:09:31 C 08 33 25.67 -01 45 53.2 c 639
2003-02-27 21:36:11 C 08 33 22.54 -01 43 30.2 c 639
2003-02-27 21:54:24 C 08 33 20.45 -01 41 51.1 c 639
2003-02-27 22:07:26 C 08 33 18.89 -01 40 41.4 c 639
2003-02-28 00:36:06 C 08 33 03.86 -01 26 24.4 c 860
2003-02-28 00:37:48 C 08 33 03.73 -01 26 13.3 c 860
2003-02-28 00:39:29 C 08 33 03.45 -01 26 04.8 c 860
2003-02-28 01:07:53 C 08 33 01.49 -01 24 08.5 15.7 H72
2003-02-28 01:13:22 C 08 33 00.79 -01 23 38.3 15.9 H72
2003-02-28 01:26:53 C 08 32 59.23 -01 22 25.6 16.4 H72
2003-02-28 01:28:30 C 08 32 58.97 -01 22 16.5 16.0 H72
2003-02-28 01:31:50 C 08 32 58.58 -01 21 57.8 16.2 H72
2003-02-28 01:33:35 C 08 32 58.48 -01 21 49.2 16.2 H72
2003-02-28 01:36:29 C 08 32 58.05 -01 21 33.6 16.1 H72
2003-03-01 21:39:56 C 08 28 12.82 +02 43 36.3 941
2003-03-01 21:41:15 C 08 28 12.70 +02 43 43.5 941
2003-03-01 21:42:33 C 08 28 12.61 +02 43 51.4 941
2003-03-01 21:43:51 C 08 28 12.49 +02 43 58.5 941
2003-03-01 21:45:10 C 08 28 12.33 +02 44 05.9 941
2003-03-01 21:46:28 C 08 28 12.11 +02 44 13.3 941
2003-03-01 21:47:46 C 08 28 11.96 +02 44 20.7 941
2003-03-01 21:49:05 C 08 28 11.86 +02 44 28.2 941
2003-03-02 00:08:30 C 08 27 55.44 +02 57 42.4 d 170
2003-03-02 00:11:11 C 08 27 55.13 +02 57 57.7 d 170
2003-03-02 00:17:16 C 08 27 54.45 +02 58 32.6 d 170
2003-03-02 02:33:38 C 08 27 42.87 +03 11 38.6 i 921
2003-03-02 02:39:40 C 08 27 42.25 +03 12 14.2 i 921
2003-03-02 02:47:49 C 08 27 41.08 +03 13 02.0 i 921
2003-03-02 12:22:21 C 08 26 38.50 +04 08 03.6 m 379
2003-03-02 12:22:38 C 08 26 38.67 +04 08 05.6 m 300
2003-03-02 12:23:40 C 08 26 38.34 +04 08 11.2 m 379
2003-03-02 12:24:40 C 08 26 38.41 +04 08 18.0 m 300
2003-03-02 12:25:30 C 08 26 38.13 +04 08 21.8 m 379
2003-03-02 12:26:30 C 08 26 38.20 +04 08 28.5 m 300
2003-03-02 12:27:29 C 08 26 37.92 +04 08 33.2 m 379
2003-03-02 12:28:21 C 08 26 37.99 +04 08 39.3 m 300
2003-03-02 12:29:45 C 08 26 37.64 +04 08 46.3 m 379
2003-03-02 12:30:11 C 08 26 37.79 +04 08 50.1 m 300
2003-03-02 12:32:02 C 08 26 37.55 +04 09 00.6 m 300
2003-03-02 12:37:59 C 08 26 36.66 +04 09 34.1 m 379
2003-03-02 23:19:00 C 08 25 27.54 +05 11 22.3 c J93
2003-03-02 23:21:02 C 08 25 27.32 +05 11 34.5 c J93
2003-03-02 23:26:20 C 08 25 26.68 +05 12 04.7 c J93
2003-03-03 15:29:13 C 08 23 43.34 +06 46 19.6 m 300
2003-03-03 15:31:05 C 08 23 43.14 +06 46 30.3 m 300
2003-03-03 15:32:55 C 08 23 42.93 +06 46 40.1 m 300
2003-03-03 15:34:44 C 08 23 42.73 +06 46 51.5 m 300
2003-03-03 15:36:36 C 08 23 42.46 +06 47 03.1 m 300
2003-03-03 15:38:26 C 08 23 42.31 +06 47 12.4 m 300
2003-03-03 21:15:51 C 08 23 08.95 +07 20 22.4 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)