(26375) 1999 DE9
Trans-Neptunian object
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(26375) 1999 DE9 (provisional designation 1999 DE9) is a trans-Neptunian object. Light-curve-amplitude analysis shows only small deviations, suggesting 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.
Discoverydate20 February 1999
(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[1] | |
| Orbital characteristics[2] | |
| Epoch 5 May 2025 (JD 2460800.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 12873 days (35.24 yr) |
| Aphelion | 78.581 AU (11.7556 Tm) |
| Perihelion | 32.159 AU (4.8109 Tm) |
| 55.370 AU (8.2832 Tm) | |
| Eccentricity | 0.41919 |
| 412.02 yr (150493 d) | |
Average orbital speed | 3.81 km/s |
| 34.314° | |
| 0° 0m 8.612s / day | |
| Inclination | 7.6148° |
| 322.908° | |
| 159.154° | |
| Known satellites | 0 |
| Earth MOID | 31.176 AU (4.6639 Tm) |
| Jupiter MOID | 26.8847 AU (4.02189 Tm) |
| Physical characteristics | |
| Dimensions | 461 ± 45 km[3] |
| 24 h (1.0 d) | |
| 0.06â0.08[3] | |
| Temperature | â37 K |
| 4.89 | |
1999 DE9's orbit is in 2:5 resonance with Neptune's.[1] Spectral analysis has shown traces of ice.[5]
