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S-type Asteroids (Tholen)
S-type (stony-type or silicaceous-type) asteroids are asteroids with a spectral type that is indicative of a siliceous (i.e. stony) mineralogical composition, hence the name. They have relatively high density. Approximately 17% of asteroids are of this type, making it the second-most common after the carbonaceous C-type. Characteristics S-type asteroids, with an astronomical albedo of typically 0.20, are moderately bright and consist mainly of iron- and magnesium-silicates. They are dominant in the inner part of the asteroid belt within 2.2 AU, common in the central belt within about 3 AU, but become rare farther out. The largest are 3 Juno (about 240–250 km across) and 15 Eunomia (230 km), with other large S-types being 29 Amphitrite, 532 Herculina and 7 Iris. These largest S-types are visible in 10x50 binoculars at most oppositions; the brightest, 7 Iris, can occasionally become brighter than +7.0, which is a higher magnitude than any asteroid ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eros - PIA02923 (color)
Eros (, ; ) is the Greek god of love and sexual intercourse, sex. The Romans referred to him as Cupid or Amor. In the earliest account, he is a Greek primordial deities, primordial god, while in later accounts he is the child of Aphrodite. He is usually presented as a handsome young man, though in some appearances he is a juvenile boy full of mischief, ever in the company of his mother. In both cases, he is winged and carries his signature bow and arrows, which he uses to make both mortals and immortal gods fall in love, often under the guidance of Aphrodite. His role in myths is mostly complementary, and he often appears in the presence of Aphrodite and the other love gods and often acts as a catalyst for people to fall in love, but has little unique mythology of his own; the most major exception being the myth of Cupid and Psyche, Eros and Psyche, the story of how he met and fell in love with his wife. Eros and Cupid, are also known, in art tradition, as a Putto (pl. Putti). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
