(79983) 1999 DF9
(79983) 1999 DF9 (provisional designation 1999 DF9) is a trans-Neptunian object of the Kuiper belt, classified as a non-resonant cubewano, that measures approximately 270 kilometers in diameter.
| Discovery | |
|---|---|
| Discovered by | J. X. Luu C. Trujillo D. C. Jewitt |
| Discovery site | Kitt Peak National Obs. |
| Discovery date | 20 February 1999 |
| Designations | |
MPC designation | (79983) 1999 DF9 |
Alternative designations | 1999 DF9 |
Minor planet category | TNO · cubewano |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 17.06 yr (6,231 days) |
| Aphelion | 53.567 AU |
| Perihelion | 39.830 AU |
Semi-major axis | 46.698 AU |
| Eccentricity | 0.1471 |
Orbital period (sidereal) | 319.12 yr (116,560 days) |
Mean anomaly | 19.489° |
Mean motion | 0° 0m 11.16s / day |
| Inclination | 9.8105° |
Longitude of ascending node | 334.84° |
| 178.63° | |
| Physical characteristics | |
| Dimensions | 265 km (calculated) 306 km |
Synodic rotation period | 6.65 h |
| 0.10 (assumed) | |
| B–V = 0.920±0.060 V–R = 0.710±0.050 V–I = 1.360±0.060 | |
| 5.797±0.110 (R) · 6.0 | |
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