Ophelia ( Eng. Ophelia ) - the satellite of the planet Uranus . It was discovered on January 20, 1986 from the pictures taken by the Voyager-2 apparatus, and received the temporary designation S / 1986 U 8 [5] . It was not available for observation until the Hubble Space Telescope received the corresponding images in 1997 [4] . Named for the character from Shakespeare's play Hamlet . Also referred to as Uranus VII [6] .
| Ophelia | |
|---|---|
| Uranus satellite | |
 Photograph by which Ophelia was discovered | |
| Discovery history | |
| Discoverer | R. Terril / Voyager-2 |
| opening date | January 20, 1986 |
| Orbital characteristics | |
| Big axis | 53,763.390 ± 0.847 km [1] |
| Eccentricity | 0,00992 ± 0,000107 [1] |
| Period of treatment | 0.37640039 ± 0.00000357 d [1] |
| Orbit inclination | 0.10362 ± 0.055 ° (to the equator of Uranus) [1] |
| physical characteristics | |
| Diameter | 54 × 38 × 38 km [2] |
| Average radius | 23 ± 4 km [2] |
| Surface area | ~ 6600 km 2 [3] |
| Weight | ~ 5.1⋅10 16 kg [3] |
| Density | ~ 1.3 g / cm 3 (presumably) |
| Acceleration of gravity | ~ 0.0070 m / s 2 [3] |
| Rotation period around the axis | synchronized |
| Albedo | 0.08 ± 0.01 [4] |
| Surface temperature | ~ 64K [3] |
| Atmosphere | missing |
With the exception of the orbit [1] , a radius of 23 km [2], and a geometric albedo of 0.08 [4] , Ophelia is practically unknown.
In the pictures transmitted by Voyager-2, Ophelia looks like an oblong object, directed by its main axis to Uranus. The ratio of its transverse size to the longitudinal is 0.7 ± 0.3 [2] .
Ophelia plays the role of a shepherd companion on the outer edge of Epsilon Uranus [7] . Ophelia's orbit is located inside the synchronous orbit of Uranus, as a result of which the orbit of this satellite gradually decreases due to the influence of tidal forces [2] .
Notes
- 2 1 2 3 4 5 Jacobson, R. A. The Orbits of the Inner Uranian Satellites From Hubble Space Telescope and Voyager 2 Observations (Eng.) // The Astronomical Journal : journal. - IOP Publishing 1998. - Vol. 115 - P. 1195-1199 . - DOI : 10.1086 / 300263 .
- ↑ 1 2 3 4 5 Karkoschka, Erich. The Element of the Satellite Satellites (Eng.) // Icarus : journal. - Elsevier , 2001. - Vol. 151 . - P. 69-77 . - DOI : 10.1006 / icar.2001.6597 .
- ↑ 1 2 3 4 Calculated from the values of other parameters.
- ↑ 1 2 3 Karkoschka, Erich. Comprehensive Photometry of the Rings and Satellites of the Uranus with the Hubble Space Telescope (Eng.) // Icarus : journal. - Elsevier , 2001. - Vol. 151 . - P. 51—68 . - DOI : 10.1006 / icar.2001.6596 .
- ↑ Smith, B. A. IAU Circular No. 4168 (Inaccessible reference - history ) (January 27, 1986). The appeal date is August 5, 2006.
- ↑ Planet and Satellite Names and Discoverers Gazetteer of Planetary Nomenclature . USGS Astrogeology (July 21, 2006). Circulation date August 5, 2006. Archived August 17, 2011.
- ↑ Esposito, L. W. Planetary rings (unknown) // Reports On Progress In Physics. - 2002. - Vol . 65 . - p . 1741—1783 . - DOI : 10.1088 / 0034-4885 / 65/12/201 .