19 Fortuna
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|
| Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html) | |
|---|---|
| Discoverer | John Russell Hind |
| Discovery date | August 22, 1852 |
| Alternate designations | A902 UG B (http://cfa-www.harvard.edu/iau/MPDes.html) |
| Category | Main belt |
| Orbital elements C (http://asteroid.lowell.edu/) Epoch October 22, 2004 (JD 2453300.5) | |
| Eccentricity (e) | 0.159 |
| Semi-major axis (a) | 365.235 Gm (2.441 AU) |
| Perihelion (q) | 307.028 Gm (2.052 AU) |
| Aphelion (Q) | 423.443 Gm (2.831 AU) |
| Orbital period (P) | 1393.378 d (3.81 a) |
| Mean orbital speed | 18.94 km/s |
| Inclination (i) | 1.573° |
| Longitude of the ascending node (Ω) | 211.379° |
| Argument of perihelion (ω) | 182.091° |
| Mean anomaly (M) | 268.398° |
| Physical characteristics | |
| Dimensions | 225.0 km 1 (http://web.media.mit.edu/~win/hstpub.pdf) |
| Mass | 1.2×1019 kg |
| Density | 2.0? g/cm³ |
| Surface gravity | 0.0629 m/s² |
| Escape velocity | 0.1190 km/s |
| Rotation period | 0.3101 d (7.443 h) 2 (http://www.psi.edu/pds/archive/lc.html) |
| Spectral class | G |
| Absolute magnitude | 7.13 |
| Albedo | 0.061 3 (http://www.psi.edu/pds/archive/astdata/ALBEDOS/albedos.tab) |
| Mean surface temperature | ~183 K |
19 Fortuna (for-tew'-na) is one of the largest Main belt asteroids. It has a composition similar to 1 Ceres: a darkly colored surface and composition of primitive carbonates.
It was discovered by J. R. Hind on August 22, 1852 and named after Fortuna, the Roman goddess of luck.
The Hubble Space Telescope observed Fortuna in 1993. It was resolved with an apparent diameter of 0.20 arcseconds (4.5 pixels in the Planetary Camera) and its shape was found to be nearly spherical. Satellites were searched for but none were detected [1] (http://web.media.mit.edu/~win/hstpub.pdf).
Stellar occultations by Fortuna have been observed several times.
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