Perdita ( Eng. Perdita ) - satellite of the planet Uranus .
| Fart | |
|---|---|
| Uranus Satellite | |
| Discovery story | |
| Discoverer | E. Karkoshka / Voyager 2 |
| opening date | May 18, 1999 (according to pictures from January 18, 1986 ) |
| Orbital characteristics | |
| Semimajor axis | 76 417 ± 1 km [1] |
| Eccentricity | 0.0012 ± 0.0005 [1] |
| Circulation period | 0.638021 ± 0.000013 d [1] |
| Orbital inclination | 0.0 ± 0.3 ° (to the equator of Uranus) [1] |
| physical characteristics | |
| Diameter | 30 × 30 × 30 km [1] |
| Average radius | 15 ± 3 km [1] |
| Surface area | ~ 2800 km 2 [2] |
| Weight | ~ 0.18⋅10 17 kg [2] |
| Density | ~ 1.3 g / cm 3 (estimated) |
| Acceleration of gravity | ~ 0.0047 m / s 2 [2] |
| Rotation period around the axis | synchronized |
| Albedo | 0.08 ± 0.01 [3] |
| Surface temperature | ~ 64 K [2] |
| Atmosphere | missing |
The first photographs of Perdita were made by the Voyager 2 apparatus in 1986 , but it was not immediately identified in these photographs. Only thirteen years later, in 1999 , it was discovered by Erich Karkoshka in the course of working with the archive of images of Voyager 2 [1] [4] . The new satellite received the provisional designation S / 1986 U 10 [4] .
However, confirming observations for a long time failed. For this reason, in 2001, the International Astronomical Union officially excluded object S / 1986 U 10 from the list of satellites of Uranus [5] .
Finally, in 2003, the images taken by the Hubble Space Telescope made it possible to recognize the space body in the place where Perdita was supposed to be, thus confirming its existence [6] [7] .
Perdita got her own name after the character of Shakespeare’s play “ Winter's Tale ”. Also referred to as Uranus XXV [8] .
The orbit of Perdita lies between the orbits of Belinda and Pak . Hubble's observations show that Perdita does not move around Uranus strictly according to Kepler’s laws , but is clearly located in the 43:44 orbital resonance with Belinda. Also, the Perdita motion is close to the 8: 7 orbital resonance with Rosalind [1] [6] .
Perdita belongs to the Portia group, which also includes Bianca , Cressida , Desdemona , Juliet , Portia , Rosalind , Cupid and Belinda [3] . These satellites have similar orbits and photometric properties [3] . With the exception of orbit [1] [6] , a radius of 15 km [1], and a geometric albedo of 0.08 [3] , practically nothing is known about Perdit.
Notes
- ↑ 1 2 3 4 5 6 7 8 9 10 Karkoschka, Erich. Voyager's Eleventh Discovery of a Satellite of Uranus and Photometry and the First Size Measurements of Nine 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 4 Karkoschka, Erich. Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope (English) // Icarus : journal. - Elsevier , 2001 .-- Vol. 151 . - P. 51-68 . - DOI : 10.1006 / icar.2001.6596 .
- ↑ 1 2 Karkoschka, Erich IAU Circular No. 7171 (inaccessible link - history ) (May 18, 1999). Date of treatment August 5, 2006.
- ↑ Foust, Jeff Moon of Uranus is demoted . Spaceflight Now (December 31, 2001). Date of treatment August 5, 2006. Archived March 10, 2012.
- ↑ 1 2 3 Showalter, Mark R .; Lissauer, Jack J. The Second Ring-Moon System of Uranus: Discovery and Dynamics (Eng.) // Science Express: journal. - 2005 .-- 22 December ( vol. 311 ). - P. 973 . - DOI : 10.1126 / science.1122882 . - PMID 16373533 .
- ↑ Showalter, M. R .; Lissauer, J. J. IAU Circular No. 8194 unopened (inaccessible link - history ) (September 3, 2003). Date of treatment August 5, 2006.
- ↑ Planet and Satellite Names and Discoverers . Gazetteer of Planetary Nomenclature . USGS Astrogeology (July 21, 2006). Date of treatment August 5, 2006. Archived August 17, 2011.