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
2010-05-04 03:21:41 C 07 21 48.67 +23 47 28.5 r 703
2010-05-04 03:29:02 C 07 21 49.57 +23 47 32.9 r 703
2010-05-05 03:29:09 C 07 24 54.63 +24 04 27.0 19.7 c 704
2010-05-05 03:43:50 C 07 24 56.42 +24 04 38.0 19.7 c 704
2010-05-05 03:58:25 C 07 24 58.35 +24 04 47.1 19.3 c 704
2010-05-05 04:13:08 C 07 25 00.23 +24 04 57.8 19.5 c 704
2010-06-11 03:56:30 C 09 30 43.34 +30 42 38.9 r 703
2010-06-11 04:03:00 C 09 30 44.42 +30 42 41.2 r 703
2010-06-11 04:09:37 C 09 30 45.28 +30 42 41.4 r 703
2010-06-11 04:16:14 C 09 30 46.33 +30 42 44.2 r 703
2014-11-18 08:15:09 C 10 22 50.03 -13 46 30.1 u 807
2014-11-18 08:20:08 C 10 22 50.58 -13 46 31.5 u 807
2014-11-18 08:24:12 C 10 22 51.03 -13 46 32.9 u 807
2014-11-18 08:27:51 C 10 22 51.41 -13 46 34.6 u 807
2014-11-18 08:33:31 C 10 22 52.00 -13 46 37.4 u 807
2014-12-29 12:39:04 C 12 19 51.00 -19 41 18.0 R G45
2014-12-29 12:43:26 C 12 19 51.49 -19 41 17.7 R G45
2014-12-29 12:47:50 C 12 19 52.10 -19 41 17.5 R G45
2014-12-29 12:54:58 C 12 19 53.06 -19 41 19.0 R G45
2014-12-29 12:59:21 C 12 19 53.65 -19 41 19.6 R G45
2014-12-29 13:03:49 C 12 19 54.26 -19 41 20.0 R G45
2015-01-04 08:32:24 C 12 39 50.54 -19 53 48.2 u 807
2015-01-04 08:35:13 C 12 39 50.96 -19 53 48.4 u 807
2015-01-04 08:38:12 C 12 39 51.41 -19 53 48.6 u 807
2015-01-04 08:40:54 C 12 39 51.79 -19 53 48.8 u 807
2015-01-04 08:43:52 C 12 39 52.23 -19 53 48.8 u 807
2015-01-20 23:49:30 C 13 45 34.37 -18 44 01.0 o K95
2015-01-20 23:51:19 C 13 45 34.59 -18 44 00.2 o K95
2015-01-20 23:53:14 C 13 45 34.94 -18 44 01.4 o K95
2015-01-21 23:56:36 C 13 50 01.79 -18 33 11.9 o K95
2015-01-21 23:58:28 C 13 50 02.14 -18 33 10.3 o K95
2015-01-25 00:19:20 C 14 03 46.72 -17 54 59.9 o K95
2015-01-25 00:31:26 C 14 03 49.13 -17 54 52.3 o K95
2015-01-25 00:47:42 C 14 03 52.18 -17 54 43.0 o K95
2015-01-30 09:26:40 S 14 29 44.383 -16 23 53.81 L C51
2015-01-30 12:35:54 S 14 30 23.928 -16 21 16.13 L C51
2015-01-30 18:54:11 S 14 31 42.989 -16 15 58.39 L C51
2015-01-30 22:03:25 S 14 32 22.658 -16 13 17.98 L C51
2015-01-31 07:30:56 S 14 34 22.193 -16 05 07.87 L C51
2015-01-31 13:49:13 S 14 35 42.122 -15 59 36.78 L C51
2015-01-31 16:58:28 S 14 36 22.222 -15 56 47.08 L C51
2015-01-31 23:16:45 S 14 37 42.51 -15 51 08.1 L C51
2015-02-01 02:25:59 S 14 38 22.91 -15 48 16.7 L C51
2015-02-01 05:35:13 S 14 39 03.21 -15 45 22.8 L C51
2015-02-01 10:18:53 S 14 40 03.782 -15 41 01.21 L C51
2015-02-01 11:53:30 S 14 40 24.27 -15 39 33.9 L C51
2015-02-01 13:28:07 S 14 40 44.38 -15 38 06.6 L C51
2015-02-01 16:37:21 S 14 41 25.01 -15 35 08.2 L C51
2015-02-01 18:11:47 S 14 41 45.27 -15 33 40.1 L C51
2015-02-01 18:11:58 S 14 41 45.33 -15 33 39.5 L C51
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)