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
1978-02-08 05:53:57 A 10 31 30.37 -28 13 24.9 14.5 809
1978-02-09 06:18:57 A 10 31 07.61 -27 36 58.2 809
1978-02-10 05:21:09 A 10 30 44.04 -26 59 26.9 809
1978-02-11 03:46:28 A 10 30 18.75 -26 19 40.2 809
1978-02-11 05:43:09 A 10 30 15.27 -26 16 05.6 809
1978-02-12 03:30:35 A 10 29 48.27 -25 33 54.0 809
1978-02-13 06:52:05 A 10 29 07.27 -24 36 04.9 809
1978-02-14 06:45:10 A 10 28 29.80 -23 40 41.2 809
1978-02-15 04:56:01 A 10 27 53.34 -22 44 58.7 809
1978-02-17 06:11:26 A 10 26 19.11 -20 24 33.1 809
1978-02-18 06:44:23 A 10 25 26.87 -19 05 05.7 809
1978-03-01 00:44:30 A 10 12 39.12 +03 28 41.1 809
1978-03-01 22:41:13 A 10 11 09.88 +06 13 41.6 494
1978-03-01 22:56:12 A 10 11 09.11 +06 15 46.6 494
1978-03-02 12:00:00 A 10 10 16.91 +07 58 29.9 885
1978-03-02 12:02:28 A 10 10 16.76 +07 58 50.9 885
1978-03-02 14:53:30 A 10 10 02.08 +08 21 38.8 13.5 885
1978-03-02 15:05:10 A 10 10 01.19 +08 23 12.6 885
1978-03-02 15:17:00 A 10 10 01.75 +08 25 58.9 323
1978-03-03 14:48:59 A 10 08 21.75 +11 38 30.8 323
1978-03-03 21:27:01 A 10 07 53.23 +12 32 33.1 057
1978-03-04 21:18:25 A 10 06 06.02 +15 56 39.1 494
1978-03-04 21:23:02 A 10 06 05.63 +15 57 36.5 494
1978-03-04 21:34:59 A 10 06 04.65 +15 59 04.6 494
1978-03-05 20:09:41 A 10 04 19.48 +19 17 33.5 14.8 993
1978-03-07 21:57:29 A 10 00 08.45 +26 44 50.7 14.5 026
1978-03-07 22:00:29 A 10 00 08.13 +26 45 16.5 026
1978-03-07 22:03:30 A 10 00 07.73 +26 45 44.4 026
1978-03-07 22:06:29 A 10 00 07.34 +26 46 13.8 026
1978-03-08 02:29:37 A 09 59 45.33 +27 27 00.7 809
1978-03-08 05:17:00 A 09 59 30.60 +27 51 07.2 688
1978-03-08 05:39:59 A 09 59 28.11 +27 54 36.2 688
1978-03-08 07:16:56 A 09 59 15.50 +28 08 55.1 A 801
1978-03-08 12:31:59 A 09 58 51.90 +28 56 31.3 13.5 885
1978-03-08 12:36:30 A 09 58 51.35 +28 57 10.6 885
1978-03-09 23:31:30 A 09 55 36.40 +34 08 35.3 13.0 026
1978-03-09 23:34:29 A 09 55 36.18 +34 09 03.0 026
1978-03-09 23:37:30 A 09 55 35.75 +34 09 27.7 026
1978-03-09 23:40:30 A 09 55 35.37 +34 09 54.6 026
1978-03-10 03:42:02 A 09 55 13.56 +34 46 35.9 809
1978-03-10 14:33:59 A 09 54 09.62 +36 20 37.2 13.5 885
1978-03-10 14:38:44 A 09 54 09.06 +36 21 18.5 885
1978-03-11 20:03:58 A 09 51 16.07 +40 32 14.9 14.0 046
1978-03-11 20:10:47 A 09 51 15.43 +40 33 06.3 046
1978-03-12 15:08:59 A 09 49 13.35 +43 09 54.4 14.0 885
1978-03-12 15:11:59 A 09 49 12.86 +43 10 19.2 885
1978-03-12 15:14:19 A 09 49 12.84 +43 10 37.5 885
1978-03-12 15:16:30 A 09 49 12.50 +43 10 57.0 885
2003-01-11 09:55:50 C 09 46 26.02 -34 34 08.5 17.6 c 644
2003-01-11 10:26:30 C 09 46 25.73 -34 34 14.2 18.5 c 644
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)