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
2003-03-05 00:58:50 C 08 20 14.54 +10 05 33.9 14.7 c H72
2003-03-05 02:04:18 C 08 20 06.81 +10 12 06.9 15.0 c H72
2003-03-05 02:06:12 C 08 20 06.65 +10 12 18.6 15.0 c H72
2003-03-05 02:07:36 C 08 20 06.45 +10 12 27.1 15.0 c H72
2003-03-05 02:09:10 C 08 20 06.31 +10 12 36.2 14.9 c H72
2003-03-05 02:10:35 C 08 20 06.16 +10 12 44.6 14.9 c H72
2003-03-05 02:13:49 C 08 20 05.73 +10 13 04.1 14.9 c H72
2003-03-05 03:15:40 C 08 19 58.50 +10 19 14.8 15.1 c H72
2003-03-05 03:17:04 C 08 19 58.32 +10 19 23.2 15.1 c H72
2003-03-05 03:18:32 C 08 19 58.15 +10 19 31.9 15.2 c H72
2003-03-05 03:19:36 C 08 19 58.02 +10 19 38.6 15.1 c H72
2003-03-05 03:21:49 C 08 19 57.71 +10 19 51.5 15.2 c H72
2003-03-05 03:22:54 C 08 19 57.63 +10 19 57.8 15.2 c H72
2003-03-05 18:50:05 C 08 18 22.26 +11 52 33.7 c 151
2003-03-05 18:53:02 C 08 18 21.97 +11 52 48.3 c 151
2003-03-05 18:54:57 C 08 18 21.77 +11 52 59.8 c 151
2003-03-05 18:57:11 C 08 18 21.52 +11 53 13.5 c 151
2003-03-05 18:58:09 C 08 18 21.40 +11 53 18.5 c 198
2003-03-05 18:59:07 C 08 18 21.30 +11 53 25.1 c 151
2003-03-05 19:00:20 C 08 18 21.15 +11 53 31.7 c 198
2003-03-05 19:05:38 C 08 18 20.56 +11 54 04.4 c 151
2003-03-05 19:05:51 C 08 18 20.53 +11 54 05.0 c 198
2003-03-05 19:07:13 C 08 18 20.36 +11 54 13.9 c 151
2003-03-05 19:10:50 C 08 18 19.98 +11 54 35.7 c 151
2003-03-05 19:13:34 C 08 18 19.66 +11 54 51.8 c 198
2003-03-05 19:19:04 C 08 18 19.04 +11 55 24.7 c 198
2003-03-05 19:24:34 C 08 18 18.42 +11 55 58.5 c 151
2003-03-05 19:26:29 C 08 18 18.20 +11 56 10.2 c 151
2003-03-05 19:28:33 C 08 18 17.95 +11 56 22.8 c 151
2003-03-05 19:30:13 C 08 18 17.79 +11 56 32.5 c 151
2003-03-05 20:47:51 C 08 18 08.96 +12 04 19.5 c 240
2003-03-05 20:49:06 C 08 18 08.82 +12 04 27.0 c 240
2003-03-05 20:50:20 C 08 18 08.68 +12 04 34.3 c 240
2003-03-05 20:51:33 C 08 18 08.54 +12 04 41.7 c 240
2003-03-05 20:53:59 C 08 18 08.26 +12 04 56.5 c 240
2003-03-05 20:56:29 C 08 18 07.98 +12 05 11.2 c 240
2003-03-05 20:57:41 C 08 18 07.84 +12 05 18.7 c 240
2003-03-05 21:01:03 C 08 18 07.46 +12 05 38.9 c 240
2003-03-06 02:37:35 C 08 17 32.73 +12 39 44.9 15.5 H72
2003-03-06 02:40:56 C 08 17 32.35 +12 40 04.9 15.3 H72
2003-03-06 02:41:59 C 08 17 32.25 +12 40 11.6 15.3 H72
2003-03-06 02:43:05 C 08 17 32.07 +12 40 18.0 15.3 H72
2003-03-06 02:44:38 C 08 17 31.93 +12 40 27.4 15.2 H72
2003-03-06 04:30:08 C 08 17 19.62 +12 51 02.3 15.3 H72
2003-03-06 04:31:28 C 08 17 19.48 +12 51 10.3 15.3 H72
2003-03-06 04:32:47 C 08 17 19.34 +12 51 18.4 15.3 H72
2003-03-06 04:34:07 C 08 17 19.20 +12 51 26.3 15.3 H72
2003-03-06 04:38:07 C 08 17 18.77 +12 51 50.1 15.3 H72
2003-03-06 05:22:48 C 08 17 14.86 +12 56 13.3 14.9 c 704
2003-03-06 05:41:26 C 08 17 12.70 +12 58 05.1 15.5 c 704
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)