IAA RAS IAA Minor Planet Database

2021 HP1

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.7739625248 ± 3.62e-05
Semi-major axis (a)2.1607092652 AU ± 3.12e-04
Inclination (i)8.39903898° ± 5.97e-04
Long. of Asc. Node (Ω)186.64488155° ± 2.19e-03
Arg. of Perihelion (ω)158.33336399° ± 2.68e-03
Mean Anomaly (M)135.88639408° ± 1.07e-01
Mean Motion (n)0.3103257223°/day ± 6.71e-05
Perihelion dist (q)0.48840127 AU ± 1.05e-04
Aphelion dist (Q)3.83301726 AU ± 5.58e-04
Orbital Period3.17610244 yr ± 6.87e-04
Physical Parameters
H (abs. magnitude)21.24
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-02
RMS Residual0.211″
Uncertainty3
Orbit TypeApollo
MOID0.125071 AU
Observations Used45
Oppositions1
Arc Total2021-2021
First Observation Used2021-04-17
Last Observation Used2021-05-19
Observations (48)
Date Type RA Dec Mag Band Observatory
2021-04-17 12:48:51 C 16 53 06.048 -09 30 15.22 – U F51
2021-04-17 13:06:38 C 16 53 07.261 -09 29 58.77 – U F51
2021-04-17 13:24:23 C 16 53 08.499 -09 29 42.38 – U F51
2021-04-17 13:42:08 C 16 53 09.723 -09 29 25.68 – U F51
2021-04-18 08:32:18 C 16 54 33.18 -09 11 10.5 – V 807
2021-04-18 08:37:38 C 16 54 33.56 -09 11 05.2 – V 807
2021-04-18 08:42:57 C 16 54 33.94 -09 11 00.1 – V 807
2021-04-18 12:15:25 C 16 54 50.390 -09 07 44.19 – U F51
2021-04-18 12:32:00 C 16 54 51.576 -09 07 28.08 – U F51
2021-04-18 12:45:27 C 16 54 52.511 -09 07 14.59 – V 568
2021-04-18 12:48:16 C 16 54 52.708 -09 07 11.83 – V 568
2021-04-18 12:48:34 C 16 54 52.729 -09 07 11.80 – U F51
2021-04-18 12:49:43 C 16 54 52.809 -09 07 10.40 – V 568
2021-04-19 08:39:17 C 16 56 23.43 -08 47 06.4 – o 691
2021-04-19 09:10:46 C 16 56 25.71 -08 46 33.4 – V V06
2021-04-19 09:16:29 C 16 56 26.18 -08 46 28.3 – V V06
2021-04-19 09:20:20 C 16 56 26.42 -08 46 23.0 – o 691
2021-04-19 09:22:13 C 16 56 26.57 -08 46 21.7 – V V06
2021-04-19 10:56:01 C 16 56 34.158 -08 44 41.10 – U F51
2021-04-19 11:29:43 C 16 56 36.641 -08 44 05.87 – U F51
2021-04-19 11:46:31 C 16 56 37.869 -08 43 48.24 – U F51
2021-05-01 08:44:55 C 17 24 46.64 -01 10 33.5 – V I52
2021-05-02 08:33:15 C 17 28 02.37 -00 11 35.2 – V I52
2021-05-02 08:36:19 C 17 28 02.79 -00 11 27.1 – V I52
2021-05-02 08:39:23 C 17 28 03.18 -00 11 18.4 – V I52
2021-05-04 11:14:29 C 17 35 46.91 +02 11 33.3 – V I52
2021-05-04 11:15:36 C 17 35 47.11 +02 11 36.9 – V I52
2021-05-04 11:16:42 C 17 35 47.27 +02 11 40.1 – V I52
2021-05-04 11:17:48 C 17 35 47.45 +02 11 43.4 – V I52
2021-05-06 08:54:27 C 17 43 59.73 +04 45 18.9 – V I52
2021-05-06 09:02:43 C 17 44 01.26 +04 45 49.2 – V I52
2021-05-06 09:03:49 C 17 44 01.45 +04 45 52.8 – V I52
2021-05-07 08:30:22 C 17 48 47.98 +06 15 54.1 – V I52
2021-05-07 08:30:58 C 17 48 48.11 +06 15 56.5 – V I52
2021-05-07 08:34:17 C 17 48 48.78 +06 16 09.8 – V I52
2021-05-07 08:34:53 C 17 48 48.91 +06 16 12.0 – V I52
2021-05-10 06:23:03 C 18 06 05.87 +11 39 38.6 – V I52
2021-05-10 06:28:10 C 18 06 07.29 +11 40 06.5 – V I52
2021-05-10 06:32:14 C 18 06 08.42 +11 40 28.0 – V I52
2021-05-10 06:39:05 C 18 06 10.39 +11 41 05.1 – V I52
2021-05-15 09:28:07 C 18 55 40.31 +25 39 16.1 – V I52
2021-05-15 09:28:28 C 18 55 40.45 +25 39 21.6 – V I52
2021-05-15 09:28:50 C 18 55 40.65 +25 39 24.3 – V I52
2021-05-15 09:29:11 C 18 55 40.83 +25 39 27.6 – V I52
2021-05-19 11:06:59 C 20 11 17.98 +40 30 06.3 – V I52
2021-05-19 11:07:26 C 20 11 18.46 +40 30 10.3 – V I52
2021-05-19 11:07:52 C 20 11 18.89 +40 30 14.7 – V I52
2021-05-19 11:08:44 C 20 11 19.78 +40 30 22.9 – V I52