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
2016-09-07 06:01:47 C 16 17 19.98 -01 39 00.7 L T05
2016-09-07 06:04:52 C 16 17 20.72 -01 39 15.7 L T05
2016-09-07 06:15:46 C 16 17 23.48 -01 40 10.1 L T05
2016-09-07 06:19:30 C 16 17 24.38 -01 40 28.4 L T05
2016-09-07 06:33:34 C 16 17 27.91 -01 41 38.5 L T05
2016-09-12 05:52:26 C 16 49 17.51 -11 47 51.3 L T05
2016-09-12 06:05:04 C 16 49 20.86 -11 48 56.3 L T05
2016-09-12 06:23:02 C 16 49 25.75 -11 50 27.6 L T05
2016-09-12 06:46:16 C 16 49 31.97 -11 52 26.1 L T05
2016-10-10 04:32:38 S 20 09 17.12 -46 57 57.8 L C51
2016-10-10 06:06:53 S 20 09 43.32 -46 59 32.5 L C51
2020-12-22 12:03:41 C 12 52 36.69 -15 06 02.3 V 703
2020-12-22 12:11:36 C 12 52 37.84 -15 06 03.3 V 703
2020-12-22 12:19:30 C 12 52 39.08 -15 06 04.3 V 703
2020-12-22 12:27:25 C 12 52 40.37 -15 06 05.8 V 703
2020-12-25 15:13:12 C 13 04 22.58 -15 13 58.7 V T08
2020-12-25 15:18:30 C 13 04 23.44 -15 13 59.3 V T08
2020-12-25 15:19:10 C 13 04 23.58 -15 13 59.3 V T08
2020-12-25 15:38:38 C 13 04 26.57 -15 13 59.8 V T08
2021-01-16 12:23:03 C 14 37 10.23 -14 12 35.7 V 703
2021-01-16 12:30:27 C 14 37 11.64 -14 12 33.1 V 703
2021-01-16 12:37:52 C 14 37 13.16 -14 12 30.1 V 703
2021-01-16 12:45:16 C 14 37 14.57 -14 12 28.6 V 703
2021-01-18 15:13:29 C 14 47 11.40 -13 53 15.2 V T08
2021-01-18 15:19:28 C 14 47 12.56 -13 53 12.9 V T08
2021-01-18 15:44:41 C 14 47 17.59 -13 53 02.6 V T08
2021-01-18 15:59:58 C 14 47 20.56 -13 52 56.0 V T08
2021-04-10 11:38:17 C 21 33 42.46 +12 06 54.8 V G96
2021-04-10 11:46:27 C 21 33 43.88 +12 06 58.2 V G96
2021-04-10 11:54:37 C 21 33 45.30 +12 07 01.5 V G96
2021-04-10 12:02:48 C 21 33 46.73 +12 07 04.9 V G96
2021-04-24 11:43:46 C 22 31 06.80 +13 55 57.8 U I41
2021-04-24 11:46:45 C 22 31 07.30 +13 55 58.4 U I41
2021-04-24 11:49:44 C 22 31 07.79 +13 55 59.1 U I41
2021-04-24 11:52:43 C 22 31 08.29 +13 55 59.8 U I41
2021-04-24 11:55:44 C 22 31 08.80 +13 56 00.6 U I41
2021-05-02 11:33:37 C 23 02 47.00 +14 33 38.8 U I41
2021-05-02 11:36:25 C 23 02 47.46 +14 33 39.5 U I41
2021-05-02 11:39:14 C 23 02 47.92 +14 33 39.8 U I41
2021-05-02 11:42:04 C 23 02 48.39 +14 33 40.3 U I41
2021-05-02 11:44:52 C 23 02 48.84 +14 33 40.8 U I41
2021-10-03 14:34:33 C 07 07 25.21 -11 13 37.7 V T05
2021-10-03 14:39:53 C 07 07 25.64 -11 13 42.3 V T05
2021-10-03 14:55:07 C 07 07 26.88 -11 13 55.3 V T05
2021-10-03 14:58:26 C 07 07 27.16 -11 13 58.1 V T05
2021-10-27 03:19:23 C 07 49 00.63 -19 40 39.4 Z C95
2021-10-27 03:59:14 C 07 49 03.04 -19 41 15.9 Z C95
2022-01-24 09:39:23 C 07 15 13.11 -34 11 56.1 V T08
2022-01-24 09:45:21 C 07 15 12.51 -34 11 49.1 V T08
2022-01-24 09:53:19 C 07 15 11.67 -34 11 39.4 V T08
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)