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| Orbital characteristics 1 | |
|---|---|
| Orbit type | Main belt |
| Semimajor axis | 2.722 AU |
| Perihelion distance | 2.496 AU |
| Aphelion distance | 2.947 AU |
| Orbital period | 4.49 years |
| Inclination | 6.61° |
| Eccentricity | 0.083 |
| Physical characteristics | |
| Diameter 1 | 214.6 km |
| Mass 3 | 6.07 × 1018 kg |
| Density 3 | 1.2 gFor other meanings of gram see gram (disambiguation). The gram (also spelt gramme is a unit of measurement of mass, and is defined in the SI system of units as one thousandth of a kilogram. See 1 E -3 kg for comparisons with other masses. The symbol for g/ cm³A cubic centimetre cm is an SI derived unit of volume, equal to the volume of a cube with side length of 1 centi metre. It was the basic unit of volume of the CGS system of units. In SI units: 1 cm³ 10−6 cubic metres 1 milli litre (mL) The abbreviat |
| Rotation periodIn astronomy, a rotation period is the time an astronomical object takes to complete one revolution around its rotation axis. See also Synchronous rotation. 3 | 5.699 hoursIn modern usage, an hour is defined as a unit of time 60 minutes, or 3600 seconds in length. It is approximately 1/24 of a median Earth day. There is also the hour of right ascension a unit of both time and angle. Earlier definitions of the hour: One twel |
| Spectral classAn asteroid is a small, solid object in our Solar System, orbiting the Sun. An asteroid is an example of a minor planet (or planetoid , which are much smaller than planets. The asteroids are believed to be remnants of the protoplanetary disc which were no | FF-type asteroid is a subdivision of C-type asteroids distinguished spectrally by differences in the ultraviolet absorption and the lack of a water absorption feature at 3 micrometres. You can use the "What links here" toolbox link to find asteroids of thi |
| Abs. magnitudeIn astronomy, absolute magnitude is the apparent magnitude, m an object would have if it were at a standardized distance away. It allows the overall brightnesses of objects to be compared without regards to distance. Absolute Magnitude for stars M In stel 1 | 7.46 |
| Albedo 4 | 0.040 |
| History 2 | |
| Discoverer | H. Goldschmidt, 1857 |
| Satellites | |
| Name | Petit-Prince |
45 Eugenia is a large Main belt asteroid. It is famed as one of the first asteroids to be found to have a moon orbiting it.
Eugenia was discovered in 1857 by Hermann Goldschmidt. It was named after Empress Eugenia di Montijo, the wife of Napoleon III, and was the first asteroid to be named after a real person, rather than a figure from classical legend (although there had been controversy about whether 12 Victoria was really named for the mythological figure or for Queen Victoria).
Eugenia is a large asteroid, with a diameter of 214 km. It is an F-type asteroid, which means that it is very dark in colouring (darker than soot) with a carbonaceous composition. Like Mathilde, its density appears to be unusually low, indicating that it may be a loosely-packed rubble pile, not a monolithic object.
In 1998, astronomers at the Canada-France-Hawaii Telescope on Mauna Kea, Hawaii, discovered a small moon orbiting Eugenia. This was the first time an asteroidal moon had been discovered by a ground-based telescope. Eugenia's moon has been named Petit-Prince, after Empress Eugenia's son, the Prince Imperial. The moon is much smaller than Eugenia, about 13 km in diameter, and takes five days to complete an orbit around it.