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
2003-11-19 02:19:10 C 22 18 55.48 +67 06 27.1 c 670
2003-11-19 02:51:23 C 22 19 12.34 +67 06 08.3 c 670
2007-03-11 06:16:49 C 12 34 02.15 +07 14 08.2 o 691
2007-03-11 06:42:09 C 12 34 00.27 +07 14 13.8 o 691
2007-03-11 07:07:29 C 12 33 58.61 +07 14 20.6 o 691
2009-03-04 10:36:22 C 12 34 27.16 +08 33 02.3 o 568
2009-03-04 11:21:50 C 12 34 24.39 +08 33 12.8 o 568
2009-03-04 13:06:48 C 12 34 17.94 +08 33 36.7 o 568
2009-03-29 05:42:10 C 11 49 14.77 +10 33 07.2 r G96
2009-03-29 06:03:55 C 11 49 12.90 +10 33 10.9 r G96
2009-03-29 06:14:47 C 11 49 11.92 +10 33 11.7 r G96
2017-03-04 12:05:58 C 12 00 38.991 +15 19 15.77 L F51
2017-03-04 12:57:59 C 12 00 35.383 +15 19 30.62 L F51
2017-03-04 13:14:58 C 12 00 34.177 +15 19 35.12 L F51
2017-03-04 13:31:59 C 12 00 32.992 +15 19 39.71 L F51
2017-03-21 07:03:38 C 11 30 29.962 +16 49 28.92 L F51
2017-03-21 07:22:04 C 11 30 28.491 +16 49 32.05 L F51
2017-03-21 07:40:22 C 11 30 27.032 +16 49 34.59 L F51
2023-03-19 05:00:49 C 11 11 33.061 +21 00 51.59 V V00
2023-03-19 05:08:00 C 11 11 32.521 +21 00 52.60 V V00
2023-03-19 05:15:08 C 11 11 31.967 +21 00 53.10 V V00
2023-03-19 05:22:17 C 11 11 31.398 +21 00 53.82 V V00