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
2022-12-26 19:48:25 C 01 51 58.608 -35 25 55.56 V M22
2022-12-29 01:53:43 C 01 55 04.133 -34 24 01.62 V W68
2022-12-29 01:58:16 C 01 55 04.346 -34 23 57.08 V W68
2022-12-29 02:08:44 C 01 55 04.978 -34 23 44.77 V W68
2022-12-29 02:23:53 C 01 55 05.827 -34 23 26.59 V W68
2023-01-25 01:51:41 C 02 38 02.674 -21 50 01.97 V W68
2023-01-25 01:56:15 C 02 38 02.966 -21 49 57.29 V W68
2023-01-25 02:16:41 C 02 38 04.435 -21 49 32.59 V W68
2023-01-25 02:24:34 C 02 38 05.110 -21 49 24.20 V W68
2023-01-28 01:59:15 C 02 43 26.630 -20 26 15.18 V G96
2023-01-28 02:06:40 C 02 43 27.188 -20 26 07.12 V G96
2023-01-28 02:14:07 C 02 43 27.732 -20 25 58.33 V G96
2023-01-28 02:21:32 C 02 43 28.276 -20 25 49.04 V G96
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)