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
2009-05-26 02:23:21 C 23 37 00.45 +43 44 09.4 w J28
2009-07-27 11:01:28 C 03 16 21.36 +19 11 05.1 r 703
2009-07-27 11:09:33 C 03 16 22.40 +19 10 55.0 r 703
2009-07-27 11:17:32 C 03 16 23.41 +19 10 44.6 r 703
2009-07-30 10:12:54 C 03 25 49.08 +17 37 05.7 r 703
2009-07-30 10:25:39 C 03 25 50.66 +17 36 48.2 r 703
2009-07-30 10:32:00 C 03 25 51.52 +17 36 39.4 r 703
2009-08-01 10:43:14 C 03 32 09.75 +16 31 49.8 o 691
2009-08-01 11:01:24 C 03 32 12.09 +16 31 25.4 o 691
2009-08-01 11:19:39 C 03 32 14.48 +16 31 01.6 o 691
2009-09-21 11:48:31 C 05 37 27.73 -14 46 04.2 r 703
2009-09-21 11:56:28 C 05 37 28.23 -14 46 16.7 r 703
2009-09-21 12:04:17 C 05 37 28.59 -14 46 31.5 r 703
2009-09-21 12:12:10 C 05 37 29.24 -14 46 42.4 r 703
2009-10-18 17:45:01 C 06 04 52.57 -31 25 52.4 r E12
2009-11-14 15:55:12 C 05 48 32.46 -43 30 48.5 r E12
2009-11-14 16:07:33 C 05 48 31.62 -43 30 57.7 r E12
2010-01-14 03:40:20 C 04 09 46.31 -32 14 39.6 r I20
2010-01-14 03:49:57 C 04 09 46.21 -32 14 26.0 r I20
2010-01-14 03:59:32 C 04 09 46.11 -32 14 12.3 r I20
2010-02-15 02:06:37 S 04 27 23.42 -12 46 59.9 L C51
2010-02-15 05:17:08 S 04 27 33.08 -12 42 07.2 L C51
2010-02-15 05:17:19 S 04 27 33.10 -12 42 07.0 L C51
2010-02-15 08:27:50 S 04 27 42.83 -12 37 14.6 L C51
2010-02-15 11:38:22 S 04 27 52.55 -12 32 23.6 L C51
2010-02-15 14:48:52 S 04 28 02.31 -12 27 30.5 L C51
2010-02-15 14:49:03 S 04 28 02.34 -12 27 30.1 L C51
2010-02-15 17:59:35 S 04 28 12.12 -12 22 38.1 L C51
2010-02-15 19:34:45 S 04 28 17.064 -12 20 12.41 L C51
2010-02-15 21:10:06 S 04 28 22.022 -12 17 46.07 L C51
2010-02-15 22:45:27 S 04 28 26.93 -12 15 20.5 L C51
2010-02-16 00:20:37 S 04 28 31.87 -12 12 55.1 L C51
2010-02-16 01:55:58 S 04 28 36.818 -12 10 28.16 L C51
2010-02-16 03:31:19 S 04 28 41.81 -12 08 03.0 L C51
2010-02-16 05:06:29 S 04 28 46.70 -12 05 37.6 L C51
2010-02-16 06:41:50 S 04 28 51.74 -12 03 11.1 L C51
2010-02-16 08:17:11 S 04 28 56.72 -12 00 45.5 L C51
2010-02-16 09:52:21 S 04 29 01.70 -11 58 19.9 L C51
2010-02-16 11:27:42 S 04 29 06.75 -11 55 54.5 L C51
2010-02-16 14:38:13 S 04 29 16.76 -11 51 02.9 L C51
2010-02-16 17:48:55 S 04 29 26.89 -11 46 11.7 L C51
2010-02-16 20:59:26 S 04 29 37.025 -11 41 19.97 L C51
2010-02-17 00:09:57 S 04 29 47.16 -11 36 29.7 L C51
2010-02-17 03:20:39 S 04 29 57.32 -11 31 37.7 L C51
2010-02-17 06:31:10 S 04 30 07.58 -11 26 48.5 L C51
2010-02-22 15:09:26 S 04 37 30.370 -08 12 34.06 L C51
2010-03-16 02:30:19 C 05 15 19.01 +03 51 32.9 19.3 c 704
2010-03-16 02:46:01 C 05 15 20.34 +03 51 52.6 19.7 c 704
2010-03-16 03:17:27 C 05 15 22.98 +03 52 34.7 19.9 c 704
2010-05-04 03:14:23 C 07 21 47.73 +23 47 23.4 r 703
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)