(26375) 1999 DE9
(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. 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. It is possibly a dwarf planet.
| 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 |
| 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) |
Semi-major axis | 56.002 AU (8.3778 Tm) |
| Eccentricity | 0.42249 |
Orbital period (sidereal) | 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° |
| 160.236° | |
| Earth MOID | 31.3582 AU (4.69112 Tm) |
| Jupiter MOID | 27.062 AU (4.0484 Tm) |
| Physical characteristics | |
| Dimensions | 461 ± 45 km |
Synodic rotation period | 24 h (1.0 d) |
| 0.06–0.08 | |
| Temperature | ≈37 K |
| 5.0 | |
(26375) 1999 DE9 orbit is in 2:5 resonance with Neptune's. Spectral analysis has shown traces of ice.
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