(26375) 1999 DE9

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(26375) 1999 DE9
Discovery
Discovered by Chadwick A. Trujillo and
Jane X. Luu
Discovery date20 February 1999
Designations
(26375) 1999 DE9
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)
56.002 AU (8.3778 Tm)
Eccentricity 0.42249
419.10 yr (153075 d)
Average orbital speed
3.81 km/s
25.385°
0° 0m 8.466s / day
Inclination 7.6076°
322.909°
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]
24  h (1.0  d)
0.06–0.08 [3]
Temperature ≈37 K
5.0

    (26375) 1999 DE9 (provisional designation 1999 DE9) is a trans-Neptunian object and a possible dwarf planet. 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.

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

    References

    1. 1 2 Marc W. Buie (March 14, 2008). "Orbit Fit and Astrometric record for 26375". SwRI (Space Science Department). Retrieved September 24, 2008.
    2. ↑ "JPL Small-Body Database Browser: 26375 (1999 DE9)". NASA/Jet Propulsion Laboratory . Retrieved April 5, 2016.
    3. 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
    4. ↑ 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
    5. ↑ Fig 3 for 1999 DE9


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