(26375) 1999 DE9

 (26375) 1999 DE₉ (also written (26375) 1999 DE9) is a trans-Neptunian object. Light-curve-amplitude analysis shows only small deviations, suggesting (26375) 1999 DE₉ is a spheroid with small albedo spots.^[4] Measurements by the Spitzer Space Telescope estimate that it is 461 ± 45 km in diameter.^[3] It was discovered in 1999 by Chad Trujillo and Jane X. Luu. It is possibly a dwarf planet.^[5]

(26375) 1999 DE₉

Discovery
Discovered by	Chadwick A. Trujillo and Jane X. Luu
Discovery date	20 February 1999
Designations
MPC designation	(26375) 1999 DE9
Minor planet category	TNO 2:5 resonance[1]
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 2
Observation arc	6619 days (18.12 yr)
Aphelion	79.663 AU (11.9174 Tm)
Perihelion	32.342 AU (4.8383 Tm)
Semi-major axis	56.002 AU (8.3778 Tm)
Eccentricity	0.42249
Orbital period	419.10 yr (153075 d)
Average orbital speed	3.81 km/s
Mean anomaly	25.385°
Mean motion	0° 0m 8.466s / day
Inclination	7.6076°
Longitude of ascending node	322.909°
Argument of perihelion	160.236°
Earth MOID	31.3582 AU (4.69112 Tm)
Jupiter MOID	27.062 AU (4.0484 Tm)
Physical characteristics
Dimensions	461 ± 45 km[3]
Rotation period	24 h (1.0 d)
Geometric albedo	0.06–0.08[3]
Temperature	≈37 K
Absolute magnitude (H)	5.0

(26375) 1999 DE₉ orbit is in 2:5 resonance with Neptune's.^[1] Spectral analysis has shown traces of ice.^[6]

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.