(26375) 1999 DE9 (provisional designation 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]
| Discovery | |
|---|---|
| Discovered by | Chadwick A. Trujillo and Jane X. Luu |
| Discovery date | 20 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 orbit is in 2:5 resonance with Neptune‘s.[1] Spectral analysis has shown traces of ice.[6]
- ^ a b Marc W. Buie (March 14, 2008). “Orbit Fit and Astrometric record for 26375”. SwRI (Space Science Department). Retrieved September 24, 2008.
- ^ “JPL Small-Body Database Browser: 26375 (1999 DE9)”. NASA/Jet Propulsion Laboratory. Retrieved April 5, 2016.
- ^ a b c 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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