31662 (1999 HP11)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.5478781327 ± 5.71e-08
Semi-major axis (a)1.5975535524 AU ± 9.03e-09
Inclination (i)18.81533685° ± 2.22e-05
Long. of Asc. Node (Ω)13.93514989° ± 2.85e-05
Arg. of Perihelion (ω)312.01670179° ± 2.78e-05
Mean Anomaly (M)354.16369228° ± 4.47e-05
Mean Motion (n)0.4881228499°/day ± 4.14e-09
Perihelion dist (q)0.72228890 AU ± 9.13e-08
Aphelion dist (Q)2.47281821 AU ± 9.23e-08
Orbital Period2.01921767 yr ± 1.71e-08
Physical Parameters
H (abs. magnitude)19.54
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.479″
Uncertainty0
Orbit TypeApollo
MOID0.125489 AU
Observations Used70
Oppositions12
Arc Total1999-2023
First Observation Used1999-03-20
Last Observation Used2023-03-19
Observations (72)
Date Type RA Dec Mag Band Observatory
1999-03-20 08:12:14 C 13 01 09.873 -00 52 50.78 e 645
1999-03-20 08:17:14 C 13 01 09.486 -00 52 50.52 22.01 e 645
1999-04-12 06:20:00 C 12 09 53.09 -00 18 42.5 a 691
1999-04-12 06:51:03 C 12 09 49.80 -00 18 41.6 a 691
1999-04-12 07:21:22 C 12 09 46.58 -00 18 40.7 a 691
1999-04-19 04:51:55 C 11 53 01.36 -00 17 56.1 i 691
1999-04-19 05:23:28 C 11 52 58.19 -00 17 56.9 i 691
1999-04-19 05:54:17 C 11 52 55.02 -00 17 57.3 i 691
1999-04-20 06:13:45 C 11 50 32.20 -00 18 34.4 i 691
1999-04-20 06:19:11 C 11 50 31.66 -00 18 35.1 i 691
1999-04-20 06:24:29 C 11 50 31.13 -00 18 35.0 i 691
1999-04-21 06:06:27 C 11 48 13.94 -00 19 23.1 i 691
1999-04-21 06:11:49 C 11 48 13.29 -00 19 23.1 i 691
1999-04-21 06:19:06 C 11 48 12.58 -00 19 23.1 i 691
1999-04-22 04:43:33 C 11 46 04.70 -00 20 20.5 i 691
1999-04-22 04:48:55 C 11 46 04.17 -00 20 20.9 i 691
1999-04-22 04:54:34 C 11 46 03.69 -00 20 20.7 i 691
1999-05-06 03:49:18 C 11 18 41.13 -00 57 23.8 i 691
1999-05-06 03:59:52 C 11 18 40.36 -00 57 25.7 i 691
1999-05-07 02:56:31 C 11 17 10.12 -01 01 35.0 z 711
1999-05-07 03:15:11 C 11 17 08.78 -01 01 39.2 z 711
1999-05-07 03:33:52 C 11 17 07.49 -01 01 42.6 z 711
1999-05-16 03:29:38 C 11 05 30.63 -01 51 10.2 i 691
1999-05-16 03:37:23 C 11 05 30.39 -01 51 13.0 i 691
1999-05-16 03:45:51 C 11 05 29.94 -01 51 14.6 i 691
1999-11-08 07:12:02 C 08 36 15.55 +69 42 23.0 853
1999-11-08 07:17:57 C 08 36 13.79 +69 42 35.1 853
1999-11-08 07:22:10 C 08 36 12.62 +69 42 42.5 853
1999-11-09 06:25:16 C 08 29 00.59 +70 23 17.5 853
1999-11-09 06:27:01 C 08 29 00.00 +70 23 20.9 853
1999-11-09 06:31:24 C 08 28 58.71 +70 23 29.0 853
2001-03-18 09:12:22 C 12 52 02.63 +01 28 13.9 d 691
2001-03-18 09:23:30 C 12 52 01.82 +01 28 15.3 d 691
2001-03-18 09:34:30 C 12 52 01.00 +01 28 16.9 d 691
2001-03-22 08:11:21 C 12 44 36.90 +01 39 27.8 d 691
2001-03-22 08:17:13 C 12 44 36.40 +01 39 28.8 d 691
2001-03-22 08:22:37 C 12 44 35.97 +01 39 29.1 d 691
2001-11-18 07:11:47 C 02 46 36.26 +81 17 43.3 696
2001-11-18 07:14:27 C 02 46 34.98 +81 17 37.2 696
2003-11-05 01:58:08 C 18 10 06.82 +56 19 15.0 18.1 c 704
2003-11-05 02:16:10 C 18 10 19.45 +56 21 03.7 18.6 c 704
2003-11-05 02:34:14 C 18 10 32.08 +56 22 52.6 18.2 c 704
2003-11-05 02:52:09 C 18 10 44.57 +56 24 39.7 18.8 c 704
2003-11-05 03:10:38 C 18 10 57.58 +56 26 31.2 18.9 c 704
2003-11-16 03:46:45 C 21 36 11.91 +67 27 27.5 18.8 c 704
2003-11-16 04:07:02 C 21 36 25.43 +67 27 25.1 19.0 c 704
2003-11-16 04:28:05 C 21 36 40.86 +67 27 20.3 19.2 c 704
2003-11-16 04:51:51 C 21 36 55.06 +67 27 20.6 19.7 c 704
2003-11-16 05:16:17 C 21 37 10.19 +67 27 18.8 18.9 c 704
2003-11-19 02:01:40 C 22 18 46.29 +67 06 35.7 c 670