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
2008-12-03 16:14:20 C 10 16 11.92 -21 05 48.5 r E12
2008-12-03 16:33:11 C 10 16 13.51 -21 05 59.3 r E12
2009-01-08 17:40:42 C 11 34 43.60 -26 50 39.2 r E12
2009-01-08 17:48:44 C 11 34 44.29 -26 50 41.3 r E12
2009-01-08 17:56:28 C 11 34 45.08 -26 50 42.1 r E12
2009-01-08 18:04:02 C 11 34 45.76 -26 50 43.6 r E12
2009-01-22 02:43:19 C 12 09 27.66 -26 46 33.1 17.5 r C20
2009-01-22 02:47:26 C 12 09 28.12 -26 46 32.3 17.5 r C20
2009-01-23 02:19:29 C 12 12 17.05 -26 40 38.8 18.2 o C20
2009-01-23 02:23:36 C 12 12 17.52 -26 40 37.6 17.9 o C20
2009-02-04 17:40:00 C 12 53 43.26 -23 31 32.0 r E12
2009-02-04 17:54:23 C 12 53 45.42 -23 31 16.4 r E12
2009-02-04 18:08:52 C 12 53 47.58 -23 31 00.8 r E12
2009-02-04 18:22:54 C 12 53 49.70 -23 30 45.6 r E12
2009-02-18 18:08:59 C 13 58 16.39 -12 37 06.2 r E12
2009-02-18 18:21:09 C 13 58 19.16 -12 36 28.8 r E12
2009-02-18 18:33:17 C 13 58 21.90 -12 35 51.1 r E12
2009-02-23 07:44:30 C 14 25 58.42 -06 03 55.1 r 808
2009-02-23 07:54:29 C 14 26 01.19 -06 03 12.2 r 808
2009-02-23 08:04:30 C 14 26 03.58 -06 02 33.3 r 808
2009-02-27 09:05:02 C 14 54 04.07 +01 18 10.2 15.6 c 704
2009-02-27 09:20:57 C 14 54 08.79 +01 19 29.5 15.7 c 704
2009-02-27 09:36:50 C 14 54 13.53 +01 20 48.8 15.9 c 704
2009-02-27 09:52:45 C 14 54 18.26 +01 22 07.8 16.5 c 704
2009-02-27 10:08:41 C 14 54 22.97 +01 23 27.2 16.7 c 704
2009-02-28 02:37:17 C 14 59 28.76 +02 46 31.8 c A24
2009-02-28 02:38:43 C 14 59 29.25 +02 46 41.0 c A24
2009-02-28 02:59:13 C 14 59 35.42 +02 48 24.3 c A24
2009-02-28 03:21:10 C 14 59 42.11 +02 50 18.6 c A24
2009-02-28 03:43:08 C 14 59 48.84 +02 52 10.9 c A24
2009-03-08 00:31:02 C 16 05 04.88 +20 12 58.4 c 595
2009-03-08 00:35:09 C 16 05 06.42 +20 13 21.2 c 595
2009-03-08 00:39:15 C 16 05 07.94 +20 13 44.0 c 595
2009-03-08 03:05:41 C 16 06 02.35 +20 27 19.1 r J27
2009-03-08 03:12:47 C 16 06 04.94 +20 27 58.5 r J27
2009-03-08 03:25:01 C 16 06 09.43 +20 29 06.3 r J27
2009-03-08 04:31:05 C 16 06 32.87 +20 35 08.5 o B75
2009-03-08 04:32:25 C 16 06 33.49 +20 35 17.3 o B75
2009-03-08 04:33:46 C 16 06 34.02 +20 35 23.8 o B75
2009-03-10 02:27:38 C 16 24 05.06 +24 42 48.8 r J51
2009-03-10 02:33:56 C 16 24 07.44 +24 43 22.2 r J51
2009-03-10 02:37:43 C 16 24 08.87 +24 43 42.3 r J51
2009-04-02 00:35:51 C 19 41 55.31 +49 28 52.3 17.0 o 084
2009-04-02 01:06:08 C 19 42 03.83 +49 29 15.6 17.3 o 084
2009-04-03 10:13:51 C 19 51 18.04 +49 51 23.6 17.1 c 704
2009-04-03 10:48:13 C 19 51 27.57 +49 51 45.5 17.8 c 704
2009-04-03 11:05:34 C 19 51 32.17 +49 51 56.7 17.7 c 704
2009-04-09 00:50:03 C 20 25 24.99 +50 44 33.0 18.2 o 084
2009-04-09 00:54:50 C 20 25 26.13 +50 44 34.5 18.0 o 084
2009-05-26 01:39:13 C 23 36 53.89 +43 44 38.5 w J28
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)