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
2015-02-06 19:34:34 S 15 08 39.94 -13 23 50.7 L C51
2015-02-06 21:09:11 S 15 09 01.572 -13 21 55.40 L C51
2015-02-06 22:43:48 S 15 09 23.20 -13 20 02.1 L C51
2015-02-07 00:18:14 S 15 09 44.81 -13 18 08.1 L C51
2015-02-07 00:18:25 S 15 09 44.83 -13 18 07.5 L C51
2015-02-07 03:27:28 S 15 10 28.09 -13 14 19.3 L C51
2015-02-07 05:02:05 S 15 10 49.77 -13 12 23.3 L C51
2015-02-07 06:36:42 S 15 11 11.50 -13 10 28.1 L C51
2015-02-07 08:11:08 S 15 11 33.194 -13 08 32.46 L C51
2015-02-07 12:54:59 S 15 12 38.41 -13 02 43.5 L C51
2015-02-07 14:29:25 S 15 13 00.15 -13 00 46.7 L C51
2015-02-07 14:29:36 S 15 13 00.19 -13 00 45.5 L C51
2015-02-07 16:04:03 S 15 13 21.98 -12 58 48.3 L C51
2015-02-07 17:38:39 S 15 13 43.78 -12 56 50.9 L C51
2015-02-07 23:56:56 S 15 15 11.16 -12 48 56.5 L C51
2015-02-08 01:31:34 S 15 15 32.99 -12 46 57.9 L C51
2015-02-08 03:06:10 S 15 15 54.94 -12 44 59.4 L C51
2015-02-08 04:40:48 S 15 16 16.81 -12 42 58.3 L C51
2015-02-08 06:15:14 S 15 16 38.69 -12 40 58.8 L C51
2015-02-08 07:49:51 S 15 17 00.739 -12 38 57.08 L C51
2015-02-08 10:59:05 S 15 17 44.61 -12 34 55.1 L C51
2015-02-08 12:33:31 S 15 18 06.58 -12 32 54.5 L C51
2015-02-08 12:33:42 S 15 18 06.62 -12 32 54.2 L C51
2015-02-08 15:42:45 S 15 18 50.55 -12 28 49.7 L C51
2015-02-08 17:17:22 S 15 19 12.56 -12 26 48.4 L C51
2015-02-08 18:51:59 S 15 19 34.73 -12 24 45.0 L C51
2015-02-08 20:26:25 S 15 19 56.69 -12 22 42.1 L C51
2015-02-08 23:35:39 S 15 20 40.920 -12 18 34.63 L C51
2015-02-09 01:10:16 S 15 21 03.03 -12 16 30.2 L C51
2015-02-09 04:19:19 S 15 21 47.32 -12 12 21.0 L C51
2015-02-09 05:53:57 S 15 22 09.43 -12 10 16.1 L C51
2015-02-09 07:28:33 S 15 22 31.534 -12 08 11.15 L C51
2015-02-09 09:02:59 S 15 22 53.705 -12 06 05.80 L C51
2015-02-09 09:03:10 S 15 22 53.755 -12 06 05.54 L C51
2015-02-09 10:37:36 S 15 23 15.919 -12 03 59.69 L C51
2015-02-09 13:46:50 S 15 24 00.45 -11 59 47.9 L C51
2015-02-09 15:21:27 S 15 24 22.541 -11 57 39.20 L C51
2015-02-09 16:55:54 S 15 24 44.86 -11 55 33.8 L C51
2015-02-09 18:30:30 S 15 25 07.11 -11 53 25.6 L C51
2015-02-09 20:05:08 S 15 25 29.35 -11 51 18.1 L C51
2015-02-09 23:14:11 S 15 26 14.114 -11 47 04.85 L C51
2015-02-10 00:48:48 S 15 26 36.28 -11 44 53.1 L C51
2015-02-10 03:58:01 S 15 27 20.99 -11 40 33.9 L C51
2015-02-10 07:07:05 S 15 28 05.81 -11 36 13.7 L C51
2015-02-10 13:25:22 S 15 29 35.29 -11 27 30.7 L C51
2015-02-11 02:01:56 S 15 32 35.299 -11 09 49.72 L C51
2015-02-11 08:20:13 S 15 34 05.587 -11 00 51.30 L C51
2015-02-11 08:20:24 S 15 34 05.645 -11 00 52.31 L C51
2015-03-13 02:11:33 C 18 32 52.31 +10 21 28.0 q 160
2015-03-13 02:14:53 C 18 32 53.23 +10 21 34.0 q 160
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)