Portia (moon)

Portia (/ˈpɔːrʃə/ POR-shə) is an inner satellite of Uranus. It was discovered from the images taken by Voyager 2 on 3 January 1986, and was given the temporary designation S/1986 U 1. The moon is named after Portia, the heroine of William Shakespeare's play The Merchant of Venice. It is also designated Uranus XII.

Portia is the second-largest inner satellite of Uranus after Puck. The Portian orbit, which lies inside Uranus' synchronous orbital radius, is slowly decaying due to tidal deceleration. The moon will one day either break up into a planetary ring or hit Uranus.

It heads a group of satellites called the Portia Group, which includes Bianca, Cressida, Desdemona, Juliet, Rosalind, Cupid, Belinda and Perdita. These satellites have similar orbits and photometric properties.

Little is known about Portia beyond its size of about 140 km, orbit, and geometric albedo of about 0.08.

In the Voyager 2 images, Portia appears as an elongated object whose major axis points towards Uranus. The ratio of axes of the Portia's prolate spheroid is 0.8 ± 0.1. Its surface is grey in color. Observations with Hubble Space Telescope and large terrestrial telescopes found water ice absorption features in the spectrum of Portia.

Portia

Portia may refer to:

Biology

Other uses

People with the given name

Fictional

Porcia Catonis

Porcia Catonis (c.70 BC – June 43 BC (or October 42 BC)), (Porcia "of Cato", in full Porcia Catonis filia, "Porcia the daughter of Cato") also known simply as Porcia, occasionally spelled "Portia" especially in 18th-century English literature, was a Roman woman who lived in the 1st century BC. She was the daughter of Marcus Porcius Cato Uticencis and his first wife Atilia. She is best known for being the second wife of Marcus Junius Brutus, the most famous of Julius Caesar's assassins, and for her suicide, reputedly by swallowing hot coals.

Biography

Early life

Porcia was born between 73 BC and 64 BC. She had an affectionate nature, was addicted to philosophy and was full of an understanding courage.Plutarch describes her as being prime of youth and beauty. When she was still very young, her father divorced her mother for adultery.

At a young age she was married first to Marcus Calpurnius Bibulus, her father's political ally. This marriage occurred between 58 BC and 53 BC. With him she may have had a son, Lucius Calpurnius Bibulus, although modern historians believe Porcia was too young to have mothered Lucius, and that he was Bibulus' son by his previous marriage, as he was old enough to fight in the battle of Philippi in 42 BC. He died in 32 BC.

Portia (The Merchant of Venice)

Portia is the heroine of William Shakespeare's The Merchant of Venice. A rich, beautiful, and intelligent heiress, she is bound by the lottery set forth in her father's will, which gives potential suitors the chance to choose between three caskets composed of gold, silver and lead. If they choose the right casket – the casket containing Portia's portrait and a scroll– they win Portia's hand in marriage. If they choose the wrong casket, they must leave and never seek another woman in marriage. Portia is glad when two suitors, one driven by greed and another by vanity, fail to choose correctly. She favours Bassanio, a young Venetian noble, but is not allowed to give him any clues to assist in his choice. Later in the play, she disguises herself as a man, then assumes the role of a lawyer's apprentice (named Balthazar) whereby she saves the life of Bassanio's friend, Antonio, in court.

Portia is one of the most prominent and appealing of the heroines in Shakespeare's mature romantic comedies. She is beautiful, gracious, rich, intelligent, and quick-witted, with high standards for her potential romantic partners. She obeys her father's will, while steadfastly seeking to obtain Bassanio. She demonstrates tact to the Princes of Morocco and Aragon, who unsuccessfully seek her hand. In the court scenes, Portia finds a technicality in the bond, thereby outwitting Shylock and saving Antonio's life when everyone else fails. It is Portia who delivers one of the most famous speeches in The Merchant of Venice:

Moon

The Moon (in Greek: σελήνη Selene, in Latin: Luna) is Earth's only natural satellite. It is one of the largest natural satellites in the Solar System, and, among planetary satellites, the largest relative to the size of the planet it orbits (its primary). It is the second-densest satellite among those whose densities are known (after Jupiter's satellite Io).

The Moon is thought to have formed approximately 4.5 billion years ago, not long after Earth. There are several hypotheses for its origin; the most widely accepted explanation is that the Moon formed from the debris left over after a giant impact between Earth and a Mars-sized body called Theia.

The Moon is in synchronous rotation with Earth, always showing the same face with its near side marked by dark volcanic maria that fill between the bright ancient crustal highlands and the prominent impact craters. It is the second-brightest regularly visible celestial object in Earth's sky after the Sun, as measured by illuminance on Earth's surface. Although it can appear a very bright white, its surface is actually dark, with a reflectance just slightly higher than that of worn asphalt. Its prominence in the sky and its regular cycle of phases have, since ancient times, made the Moon an important cultural influence on language, calendars, art, and mythology.

Moon (visual novel)

Moon (styled as Moon.) is a Japanese adult visual novel developed by Tactics, a brand of Nexton, released on November 21, 1997 playable on Windows PCs. The game was described by the development team as a "Reaching the Heart AVG" (心に届くAVG, Kokoro ni Todoku AVG). The story follows the protagonist Ikumi Amasawa, a girl who joins an organization called Fargo in the hopes of discovering why and how her mother died, who was a member of the same group. The gameplay in Moon follows a branching plot line which offers pre-determined scenarios with courses of interaction, and focuses on the three female main characters. The game ranked twice in the national top 50 for best-selling PC games sold in Japan.

Much of the staff that created the game later became the founding members of the visual novel brand Key. Moon was the starting point for Key's origins, and was the first time the principal Key team was formed. A novel based on the game written by Midori Tateyama was released in July 1998 by Movic. The game's original soundtrack was released bundled with Dōsei's soundtrack in August 2000 at Comiket 58; Dōsei was Tactics' first game. Moon has been referenced in other media not directly related to the game, such as in Tactics' third game One: Kagayaku Kisetsu e, and in the second anime adaptation of Key's first game Kanon.

Natural satellite

A natural satellite is a celestial body that orbits another celestial body of greater mass (e.g., a planet, star, or dwarf planet), which is called its primary. For example, the Moon is a natural satellite of Earth, and Earth is a natural satellite of the Sun.

In the Solar System there are 173 known natural satellites which orbit within 6 planetary satellite systems. In addition, several other objects are known to have satellites, including three IAU-listed dwarf planets: Pluto, Haumea, and Eris.As of January 2012, over 200 minor-planet moons have been discovered. There are 76 known objects in the asteroid belt with satellites (five with two each), four Jupiter trojans, 39 near-Earth objects (two with two satellites each), and 14 Mars-crossers. There are also 84 known natural satellites of trans-Neptunian objects. Some 150 additional small bodies have been observed within the rings of Saturn, but only a few were tracked long enough to establish orbits. Planets around other stars are likely to have satellites as well, and although numerous candidates have been detected to date, none have yet been confirmed.