40 Harmonia
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A three-dimensional model of 40 Harmonia based on its light curve.
|
|
| Discovery | |
|---|---|
| Discovered by | H. Goldschmidt |
| Discovery date | March 31, 1856 |
| Designations | |
| 1950 XU | |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 355.021 Gm (2.373 AU) |
| Perihelion | 323.537 Gm (2.163 AU) |
| 339.279 Gm (2.268 AU) | |
| Eccentricity | 0.046 |
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|
Average orbital speed
|
19.77 km/s |
| 249.120° | |
| Inclination | 4.256° |
| 94.287° | |
| 268.988° | |
| Physical characteristics | |
| Dimensions | 107.6 km |
| Mass | ~1.3×1018 kg |
|
Mean density
|
2.0? g/cm³ |
| ~0.0301 m/s² | |
| ~0.0569 km/s | |
| 0.3712 d (8.909 h)[2] | |
| Albedo | 0.242 (geometric)[3] |
| Temperature | ~177 K |
|
Spectral type
|
S |
| 9.31 (brightest) | |
| 7.0 | |
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40 Harmonia /hɑːrˈmoʊniə/ is a large main-belt asteroid. It was discovered by German-French astronomer Hermann Goldschmidt on March 31, 1856,[4] and named after Harmonia, the Greek goddess of harmony. The name was chosen to mark the end of the Crimean War.
The spectrum of 40 Harmonia matches an S-type in the Tholen classification system, and is similar to primitive achondrite meteorites.[5]
Photometric observations at the Organ Mesa Observatory in Las Cruces, New Mexico during 2008–09 were used to generate a light curve that showed four unequal minima and maxima per cycle. The curve shows a period of 8.909 ± 0.001 hours with a brightness variation of 0.28 ± 0.02 in magnitude. This result is compatible with previous studies.[2]
Speckle interferometric observations carried out with the Nicholas U. Mayall Telescope at the Kitt Peak National Observatory during 1982–84 failed to discover a satellite companion.[6] In 1988 a search for satellites or dust orbiting this asteroid was performed using the UH88 telescope at the Mauna Kea Observatories, but the effort came up empty.[7]
References
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<references />, or <references group="..." />External links
- Orbital simulation from JPL (Java)
- Ephemeris
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