Tags: Planet.

(26375) 1999 DE9 (also written (26375) 1999 DE9) is a trans-Neptunian object. Light-curve-amplitude analysis shows only small deviations suggesting 1999 DE9 is a spheroid with small albedo spots. Measurements by the Spitzer Space Telescope estimate that it is 461 ± 45 km in diameter. It was discovered in 1999 by Chad Trujillo and Jane X. Luu.It is classified as a resonant as its 417-year orbit is in 2:5 resonance with Neptune’s orbit. Spectral analysis has shown traces of ice.

apoapsis (km)
1.18163e+13
average speed (km/s)
13716.0
orbital period (μ)
1.3103e+10
periapsis (km)
4.8356e+12
temperature (K)
37.0
absolute magnitude
4.7
albedo
0.06
discovery date
1999-02-20
discoverer
Chad Trujillo, Jane Luu
epoch
December 31 2006 (JD 2454100.5)

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