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
2003-03-12 13:15:43 C 08 02 12.97 +27 53 04.4 m 379
2003-03-13 19:44:30 C 07 59 25.62 +30 41 36.5 c 127
2003-03-13 19:48:49 C 07 59 25.20 +30 41 59.9 c 127
2003-03-13 19:52:50 C 07 59 24.77 +30 42 22.1 c 127
2003-03-13 20:41:49 C 07 59 20.16 +30 46 48.1 c J93
2003-03-13 20:50:00 C 07 59 19.39 +30 47 32.4 c J93
2003-03-13 20:52:03 C 07 59 19.18 +30 47 43.9 c J93
2003-03-14 21:31:00 C 07 57 05.57 +32 59 47.2 c J93
2003-03-14 21:34:03 C 07 57 05.29 +33 00 04.7 c J93
2003-03-14 21:37:05 C 07 57 04.97 +33 00 18.6 c J93
2003-03-14 21:40:08 C 07 57 04.63 +33 00 35.2 c J93
2003-03-14 23:00:15 C 07 56 56.35 +33 07 36.0 c 198
2003-03-14 23:04:16 C 07 56 55.96 +33 07 57.1 c 198
2003-03-14 23:08:17 C 07 56 55.57 +33 08 18.1 c 198
2003-03-14 23:13:06 C 07 56 55.10 +33 08 43.0 c 198
2003-03-14 23:16:19 C 07 56 54.80 +33 08 59.5 c 198
2003-03-16 19:21:31 C 07 53 06.53 +36 54 34.2 d 151
2003-03-16 19:23:01 C 07 53 06.31 +36 54 42.8 d 151
2003-03-16 19:27:14 C 07 53 05.92 +36 55 03.8 d 151
2003-03-16 19:30:16 C 07 53 05.62 +36 55 18.6 d 151
2003-03-16 19:31:35 C 07 53 05.55 +36 55 23.8 d 151
2003-03-16 19:32:32 C 07 53 05.44 +36 55 28.4 d 151
2003-03-16 19:33:30 C 07 53 05.36 +36 55 33.8 d 151
2003-03-16 19:34:26 C 07 53 05.27 +36 55 37.6 d 151
2003-03-16 19:35:29 C 07 53 05.17 +36 55 42.8 d 151
2003-03-16 19:36:53 C 07 53 04.99 +36 55 51.8 d 151
2003-03-16 19:37:41 C 07 53 04.93 +36 55 54.8 d 151
2003-03-16 19:38:47 C 07 53 04.85 +36 56 00.0 d 151
2003-03-16 21:01:55 C 07 52 57.00 +37 02 49.1 c 127
2003-03-16 21:05:48 C 07 52 56.66 +37 03 08.4 c 127
2003-03-16 21:11:30 C 07 52 56.13 +37 03 35.9 c 127
2003-03-16 21:20:58 C 07 52 55.23 +37 04 22.6 c 127
2003-03-17 19:47:43 C 07 51 02.58 +38 53 38.0 c 185
2003-03-17 19:53:43 C 07 51 02.02 +38 54 06.6 c 185
2003-03-17 19:55:47 C 07 51 01.81 +38 54 16.5 c 185
2003-03-17 19:57:46 C 07 51 01.64 +38 54 25.8 c 185
2003-03-17 19:59:27 C 07 51 01.49 +38 54 33.8 c 185
2003-03-17 20:01:11 C 07 51 01.31 +38 54 42.2 c 185
2003-03-17 21:26:29 C 07 50 53.34 +39 01 26.8 c 163
2003-03-17 21:27:24 C 07 50 53.28 +39 01 30.4 c 163
2003-03-17 21:28:16 C 07 50 53.22 +39 01 35.6 c 163
2003-03-17 21:29:10 C 07 50 53.13 +39 01 39.3 c 163
2003-03-18 18:48:04 C 07 49 09.47 +40 41 42.8 d 151
2003-03-18 18:49:20 C 07 49 09.33 +40 41 49.0 d 151
2003-03-18 18:50:38 C 07 49 09.22 +40 41 54.9 d 151
2003-03-18 18:51:38 C 07 49 09.12 +40 41 59.4 d 151
2003-03-18 18:52:43 C 07 49 09.03 +40 42 04.2 d 151
2003-03-18 18:53:51 C 07 49 08.91 +40 42 09.4 d 151
2003-03-18 18:55:09 C 07 49 08.83 +40 42 15.6 d 151
2003-03-18 18:56:50 C 07 49 08.66 +40 42 22.7 d 151
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)