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431 Nephele is a large Themistian asteroid. It is spectral C-type and is probably composed of carbonaceous material.
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 18 December 1897 |
| Designations | |
| (431) Nephele | |
| Pronunciation | /ˈnɛfəliː/[1] |
Named after | Nephele |
| 1897 DN | |
| Main belt (Themis) | |
| Adjectives | Nephelean /nɛfɪˈliːən/ |
| Orbital characteristics[2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 113.52 yr (41462 d) |
| Aphelion | 3.67837 AU (550.276 Gm) |
| Perihelion | 2.61178 AU (390.717 Gm) |
| 3.14507 AU (470.496 Gm) | |
| Eccentricity | 0.16957 |
| 5.58 yr (2037.3 d) | |
| 230.611° | |
| 0° 10m 36.152s / day | |
| Inclination | 1.82752° |
| 117.229° | |
| 216.161° | |
| Physical characteristics | |
| 101.900±0.988 km[2] 94.58±1.03 km | |
| Mass | (7.44 ± 4.14/2.39)×1017 kg[3] |
Mean density | 1.678 ± 0.935/0.54 g/cm3[3] |
| 18.821 h (0.7842 d) | |
| 0.055±0.005[2] | |
| C | |
| 9.12[2] | |
It was discovered by Auguste Charlois on 18 December 1897 in Nice.
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