IAA RAS IAA Minor Planet Database

2021 AC4

NEO MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4447471000
Semi-major axis (a)1.7297854000 AU
Inclination (i)3.07808000°
Long. of Asc. Node (Ω)110.13479000°
Arg. of Perihelion (ω)335.28359000°
Mean Anomaly (M)57.91434000°
Mean Motion (n)0.4332272200°/day
Perihelion dist (q)0.96046840 AU
Aphelion dist (Q)2.49910240 AU
Orbital Period2.27503640 yr
Physical Parameters
H (abs. magnitude)28.87
G (slope)0.15
Orbit Solution
SourceMPC
Solution Date—
RMS Residual0.680″
Uncertainty7
Orbit TypeApollo
MOID0.001757 AU
Observations Used38
Oppositions1
Arc Total—
First Observation Used—
Last Observation Used2021-01-12
Observations (44)
Date Type RA Dec Mag Band Observatory
2021-01-10 07:35:27 C 09 10 14.50 +16 09 17.9 – V 703
2021-01-10 07:50:34 C 09 10 58.79 +16 13 20.5 – V 703
2021-01-10 07:58:08 C 09 11 20.85 +16 15 20.2 – V 703
2021-01-10 08:23:53 C 09 12 34.08 +16 21 54.3 – V I52
2021-01-10 08:24:35 C 09 12 36.06 +16 22 05.5 – V I52
2021-01-10 08:25:18 C 09 12 38.03 +16 22 16.1 – V I52
2021-01-10 08:25:59 C 09 12 39.98 +16 22 26.3 – V I52
2021-01-10 09:38:28 C 09 15 56.42 +16 39 36.0 – V I52
2021-01-10 09:41:13 C 09 16 03.60 +16 40 12.9 – V I52
2021-01-10 09:43:58 C 09 16 10.79 +16 40 49.4 – V I52
2021-01-10 09:46:43 C 09 16 17.95 +16 41 25.9 – V I52
2021-01-10 20:53:06 C 09 42 01.99 +18 26 44.8 – V N88
2021-01-10 20:53:51 C 09 42 03.25 +18 26 51.0 – V N88
2021-01-10 22:12:01 C 09 45 06.89 +18 33 55.1 – V L01
2021-01-10 22:13:02 C 09 45 08.42 +18 34 02.8 – V L01
2021-01-10 22:16:20 C 09 45 13.46 +18 34 27.4 – V L01
2021-01-10 22:17:41 C 09 45 15.47 +18 34 37.2 – V L01
2021-01-10 22:46:38 C 09 45 56.28 +18 36 35.1 – V 033
2021-01-10 22:47:29 C 09 45 57.53 +18 36 41.3 – V 033
2021-01-10 22:48:19 C 09 45 58.76 +18 36 47.1 – V 033
2021-01-10 22:57:40 C 09 46 24.77 +18 38 57.9 – V I93
2021-01-10 23:03:50 C 09 46 33.88 +18 39 42.8 – V I93
2021-01-10 23:10:06 C 09 46 43.07 +18 40 28.2 – V I93
2021-01-10 23:11:47 C 09 46 38.58 +18 40 51.6 – V 203
2021-01-10 23:29:48 C 09 47 04.31 +18 42 57.1 – V 203
2021-01-10 23:49:57 C 09 47 32.42 +18 45 14.1 – V 203
2021-01-11 07:14:43 C 09 57 59.66 +19 26 49.8 – V I52
2021-01-11 07:15:31 C 09 58 00.49 +19 26 54.6 – V I52
2021-01-11 07:16:20 C 09 58 01.30 +19 26 58.8 – V I52
2021-01-11 07:17:09 C 09 58 02.12 +19 27 02.1 – V I52
2021-01-12 00:55:59 C 10 13 55.07 +20 21 01.2 – V 204
2021-01-12 01:12:44 C 10 14 04.30 +20 21 43.4 – V 204
2021-01-12 01:29:28 C 10 14 13.43 +20 22 24.1 – V 204
2021-01-12 07:06:28 C 10 18 12.74 +20 35 36.7 – V V06
2021-01-12 07:08:01 C 10 18 13.49 +20 35 40.7 – V V06
2021-01-12 07:09:35 C 10 18 14.23 +20 35 44.7 – V V06
2021-01-12 07:11:08 C 10 18 14.96 +20 35 48.5 – V V06
2021-01-12 09:43:01 C 10 19 20.45 +20 41 25.9 – o 691
2021-01-12 09:58:00 C 10 19 26.26 +20 41 53.1 – o 691
2021-01-12 10:13:00 C 10 19 32.07 +20 42 19.8 – o 691
2021-01-12 11:34:04 C 10 20 02.85 +20 44 21.6 – V I52
2021-01-12 11:36:29 C 10 20 03.80 +20 44 25.2 – V I52
2021-01-12 11:38:55 C 10 20 04.68 +20 44 28.4 – V I52
2021-01-12 11:41:20 C 10 20 05.58 +20 44 32.0 – V I52