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
2003-08-23 10:56:10 C 04 06 58.35 +10 43 49.6 19.2 c 704
2003-08-25 09:27:19 C 04 10 59.71 +08 13 48.9 17.7 c 704
2003-08-25 09:46:03 C 04 11 01.23 +08 12 48.8 18.7 c 704
2003-08-25 10:09:42 C 04 11 03.14 +08 11 32.5 18.1 c 704
2003-08-25 10:28:40 C 04 11 04.64 +08 10 31.4 17.2 c 704
2003-08-25 10:46:59 C 04 11 06.10 +08 09 32.4 17.1 c 704
2003-09-05 02:28:28 C 04 30 14.20 -05 30 10.4 c 204
2003-09-05 02:29:41 C 04 30 14.28 -05 30 14.7 c 204
2003-09-05 02:30:54 C 04 30 14.38 -05 30 18.3 c 204
2003-09-05 02:32:08 C 04 30 14.43 -05 30 22.0 c 204
2003-09-05 02:33:20 C 04 30 14.46 -05 30 23.8 c 204
2003-09-19 16:19:07 C 04 47 09.35 -22 31 49.5 16.8 c E17
2003-09-19 16:35:00 C 04 47 09.65 -22 32 32.4 16.5 c E17
2003-09-19 16:50:32 C 04 47 10.09 -22 33 13.5 16.5 c E17
2003-09-23 15:15:59 C 04 49 33.34 -26 36 18.1 r 428
2003-09-23 15:19:45 C 04 49 33.43 -26 36 27.6 r 428
2003-09-23 15:23:17 C 04 49 33.48 -26 36 36.3 r 428
2003-09-26 13:43:14 C 04 50 38.84 -29 26 52.5 17.1 c E17
2003-09-26 14:02:10 C 04 50 39.10 -29 27 37.4 17.0 c E17
2003-09-26 14:26:00 C 04 50 39.26 -29 28 34.4 17.1 c E17
2003-10-05 07:11:44 C 04 50 09.08 -36 56 37.6 c 859
2003-10-05 07:14:58 C 04 50 08.94 -36 56 44.4 c 859
2003-10-26 05:16:35 C 04 25 31.07 -48 43 22.3 o 859
2003-10-26 05:21:45 C 04 25 30.10 -48 43 26.8 o 859
2003-10-26 05:22:19 C 04 25 30.55 -48 43 27.4 o 859
2003-10-26 05:28:38 C 04 25 29.86 -48 43 35.3 o 859
2003-11-01 14:04:23 C 04 12 22.12 -50 30 51.0 r 428
2003-12-06 04:52:14 C 03 05 29.91 -47 14 42.6 c 735
2003-12-06 05:01:21 C 03 05 29.63 -47 14 34.1 c 735
2003-12-06 05:08:45 C 03 05 29.23 -47 14 28.1 c 735
2004-02-03 02:47:30 C 03 29 26.52 -18 43 31.7 c 735
2004-02-03 02:50:41 C 03 29 26.66 -18 43 27.1 c 735
2004-02-07 01:22:40 C 03 35 18.69 -16 39 16.9 c 735
2004-02-07 01:30:22 C 03 35 19.20 -16 39 06.3 c 735
2004-02-07 01:35:10 C 03 35 19.51 -16 39 00.4 c 735
2004-03-16 02:39:03 C 04 47 59.64 +01 50 10.2 19.6 c 704
2004-03-16 02:54:14 C 04 48 01.03 +01 50 27.6 19.5 c 704
2004-03-16 03:09:36 C 04 48 02.40 +01 50 43.9 19.7 c 704
2004-03-16 03:24:47 C 04 48 03.82 +01 51 00.9 19.6 c 704
2004-12-01 01:35:10 C 21 38 51.57 -29 56 47.4 o 735
2004-12-08 00:26:30 C 22 07 36.43 -29 20 55.7 c 735
2004-12-08 00:32:47 C 22 07 37.43 -29 20 54.3 c 735
2004-12-08 00:41:08 C 22 07 38.77 -29 20 52.1 c 735
2004-12-08 00:50:34 C 22 07 40.44 -29 20 48.1 c 735
2005-01-14 01:11:56 C 00 16 23.05 -21 27 56.1 r 735
2005-01-14 01:25:27 C 00 16 24.73 -21 27 45.6 r 735
2005-01-19 01:53:07 C 00 31 32.84 -20 02 23.9 d 291
2005-01-19 01:59:49 C 00 31 33.67 -20 02 19.0 d 291
2005-01-19 02:06:43 C 00 31 34.54 -20 02 13.8 d 291
2008-12-03 15:55:35 C 10 16 10.34 -21 05 38.9 r E12
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)