19 Fortuna
| Discovery | |
|---|---|
| Discovered by | John Russell Hind |
| Discovery date | 22 August 1852 |
| Designations | |
| (19) Fortuna | |
| Pronunciation | /fɔːrˈtjuːnə/ |
Named after | Fortūna |
| A902 UG | |
| Main belt | |
| Adjectives | Fortunian /fɔːrˈtjuːniən/ |
| Symbol | (historical) |
| Orbital characteristics | |
| Epoch 17.0 October 2024 (JD 2460600.5) | |
| Aphelion | 2.831 AU (423.443 million km) |
| Perihelion | 2.052 AU (307.028 million km) |
| 2.441 AU (365.235 million km) | |
| Eccentricity | 0.159 |
| 3.81 a (1393.378 d) | |
Average orbital speed | 18.94 km/s |
| 268.398° | |
| Inclination | 1.573° |
| 211.379° | |
| 182.091° | |
| Earth MOID | 1.06316 AU |
| Jupiter MOID | 2.60305 AU |
| TJupiter | 3.483 |
| Physical characteristics | |
| Dimensions | (225 × 205 × 195) ± 12 km (242 × 203 × 192) ± 10 km |
| 211±2 km 225 km | |
| Flattening | 0.21 |
| Mass | (8.8±1.4)×1018 kg 12.7×1018 kg |
Mean density | 1.80±0.29 g/cm3 2.70±0.48 g/cm3 |
Equatorial surface gravity | ~0.0629 m/s² |
Equatorial escape velocity | ~0.1190 km/s |
| 7.4432 h (0.3101 d) 7.443224±0.000001 h | |
| 29° | |
Pole ecliptic longitude | 103°±3° |
Pole ecliptic latitude | 60°±3° |
| 0.056 0.037 | |
| Temperature | ~180 K |
| G | |
| 8.88 to 12.95 | |
| 7.49 7.13 | |
| 0.25" to 0.072" | |
19 Fortuna is one of the largest main-belt asteroids. It has a composition similar to 1 Ceres: a darkly colored surface that is heavily space-weathered with the composition of primitive organic compounds, including tholins.
Fortuna is 225 km in diameter and has one of the darkest known geometric albedos for an asteroid over 150 km in diameter. Its albedo has been measured at 0.028 and 0.037. The spectra of the asteroid displays evidence of aqueous alteration.