May 28 – Discovery of Asteroid 99 Dike

Asteroid 99 Dike was the first of many asteroids (and the occasional comet) to be discovered by Alphonse Borrelly (1842-1926) from his Marseilles observatory. This one was spotted on May 28th 1868.  I have very little to say about it, except that I think it should be pronounced die-kee rather than dyke or decay.

99 Dike has been shown, like three-quarters of all known asteroids, to be a carbonaceous “C-type”, meaning it has a high carbon content, which also means it is dark in colour.  According to the JPL Small Body Database, Dike is about 67km across, takes 1,589 days to orbit the Sun, and has an absolute magnitude of 9.43.

Dike Astrea was a daughter of Zeus and Themis, and was the goddess in charge of justice and fair judgement in the mortal world (her mother had the same responsibility over the immortals).

Dike Astrea (credit : GearedBull at Wikipedia)