488474 (1999 HD1)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4179191902 ± 1.47e-07
Semi-major axis (a)1.1318781918 AU ± 4.25e-09
Inclination (i)18.21466714° ± 1.45e-05
Long. of Asc. Node (Ω)209.85119632° ± 1.31e-05
Arg. of Perihelion (ω)147.97798299° ± 2.28e-05
Mean Anomaly (M)285.35280547° ± 3.03e-05
Mean Motion (n)0.8184887937°/day ± 4.61e-09
Perihelion dist (q)0.65884457 AU ± 1.66e-07
Aphelion dist (Q)1.60491181 AU ± 1.66e-07
Orbital Period1.20420254 yr ± 6.78e-09
Physical Parameters
H (abs. magnitude)20.32
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.386″
Uncertainty0
Orbit TypeApollo
MOID0.216594 AU
Observations Used102
Oppositions4
Arc Total1999-2024
First Observation Used1999-04-16
Last Observation Used2024-03-17
Observations (105)
Date Type RA Dec Mag Band Observatory
2024-02-18 09:09:55 C 09 17 21.602 -29 51 41.25 X F52
2024-02-18 09:23:00 C 09 17 20.359 -29 51 25.55 X F52
2024-03-17 06:43:10 C 08 42 01.864 -14 21 55.74 X F51
2024-03-17 07:00:01 C 08 42 01.575 -14 21 33.35 X F51
2024-03-17 07:34:26 C 08 42 00.990 -14 20 47.21 X F51