(26375) 1999 DE9
| Discovery | |
|---|---|
| Discovered by | Chadwick A. Trujillo and Jane X. Luu |
| Discovery date | 20 February 1999 |
| Designations | |
| (26375) 1999 DE9 | |
| TNO 2:5 resonance | |
| Orbital characteristics | |
| 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 |
| 24 h (1.0 d) | |
| 0.06–0.08 | |
| 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. 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.
(26375) 1999 DE9 orbit is in 2:5 resonance with Neptune's. Spectral analysis has shown traces of ice.