August 25 – Discovery of Cupid and Mab (2003)

Today in 2003, Cupid and Mab, moons of Uranus, both of which had been too dim to see on Voyager photographs, were discovered by Mark R Showalter and Jack J Lissauer using the Hubble Space Telescope. Cupid was named after the character in William Shakespeare’s rarely performed and possibly incomplete play Timon of Athens, and Mab after the queen of the fairies who is mentioned in Romeo and Juliet (and as a long-time fan I would also refer you to The Fairy Feller’s Master Stroke on the album Queen II).  Mab has unusual hobbies. She drives her chariot (which I believe is made from an acorn) up people’s noses to enable her to influence their dreams, and she is thought to decide who gets infected by herpes simplex.

The best picture I could find of Mab.
The best picture I could find of Mab.

Neither Cupid nor Mab could be described as impressive bodies.  Cupid measures about 18 km in diameter, while Mab is thought to be about 24 km.

Also today, asteroid 84 Klio was discovered by R Luther in 1865.  Clio (or Klio or Kleio) was the muse of history.  A daughter of Zeus and Mnemosyne, she had one son, to whom she gave the butchly masculine name Hyacinth. Her own name is derived from the verb kleô, meaning to celebrate or make famous.

1889 – Asteroid 287 Nephthys discovered by C F H Peters, and is the last of his incredible haul of 48 asteroids.  Nephthys is a large, S-type main belt asteroid, and for a change is named after a character from Egyptian mythology, the daughter of Nut and Geb, and sister of Isis.


I’m going to have to do some digging on Peters, because I find it hard to believe that after 28 years of tracking the things, he doesn’t have an asteroid named after him.  I’ve found two so far named after people called Peters, and he isn’t either of them.

Finally today, Voyager 2 made its closest approach to Neptune on August 25th, 1989.  This was the end of a bit of a purple patch for NASA.  Photographs from the outer planets had enthralled the inhabitants of this one for more than a decade, and Neptune didn’t disappoint.  Voyager 2 was able to get some great shots of the planet, including the “Great Dark Spot” which seems to have subsequently vanished. There was also time for a visit to Triton, Neptune’s volcanically active largest moon, thought to be a captured Kuiper Belt object.

Neptune and Triton from the departing Voyager 2 (image credit: NASA)
Neptune and Triton from the departing Voyager 2 (image credit: NASA)

Although they didn’t know it at the time, this fly-by marked the point at which every planet in the solar system had been visited (back in the day they still had Pluto on the list, but it would eventually be removed).

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