(26375) 1999 DE9

(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° 0^m 8.466^s / 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 (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 orbit is in 2:5 resonance with Neptune's.^[1] Spectral analysis has shown traces of ice.^[6]

References

1 2 Marc W. Buie (2008-03-14). "Orbit Fit and Astrometric record for 26375". SwRI (Space Science Department). Retrieved 2008-09-24.
↑ "JPL Small-Body Database Browser: 26375 (1999 DE9)". NASA/Jet Propulsion Laboratory. Retrieved 5 April 2016.
1 2 3 Stansberry, Grundy, Brown, Spencer, Trilling, Cruikshank, Luc Margot Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope (2007) arXiv:astro-ph/0702538
↑ Tancredi, G., & Favre, S. (2008) Which are the dwarfs in the Solar System?. Depto. Astronomía, Fac. Ciencias, Montevideo, Uruguay; Observatorio Astronómico Los Molinos, MEC, Uruguay. Retrieved August 10, 2011
↑ Icy Dwarf Planets and TNOs
↑ Fig 3 for 1999 DE9

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