January 27 – Pasiphae

Jupiter’s moon Pasiphae (known as 1908 CJ when first discovered, then Jupiter VIII) was first seen by human eyes on January 28th 1908.  The eyes in question belonged to Philibert Jacques Melotte, a British astronomer, despite the name, and the actual discovery date goes down as the 27th rather than the 28th because that was when CJ was first photographed by the Royal Greenwich Observatory.  It’s one of the retrograde satellites of Jupiter, and was eventually named after the mother of the Minotaur (a name with an “e” on the end, in the manner suggested by Jürgen Blunck to distinguish between Jupiter’s prograde and retrograde moons) after being informally known as Poseidon for a while.

There’s apparently no rush at the International Astronomical Union.  The name Pasiphae was finally proposed by the “Working Group for Planetary System Nomenclature” at the same time as eight other Jovian moons, in October 1975, 67 years after discovery.  It was then accepted by the IAU General Assembly the following August.

Daedalus and Pasiphae (fresco from Pompeii)

Daedalus and Pasiphae (fresco from Pompeii)

Pasiphae is a small moon by the standards of more well-known satellites at about 20km radius, but because of the enormous quantity of Jovian moons, most of which have radii in single figures, it’s actually one of the larger.

1904  –  Asteroid 523 Ada discovered January 29th, 1904 by American astronomer Raymond S. Dugan.  He named it after Ada Helme, a schoolfriend from Montague, Mass.


1967  –  Gus Grissom, Roger Chaffee and Ed White are killed in a cabin fire aboard Apollo 1.  Officially designated AS-204, the name was changed to Apollo 1 at the request of the widows of the crew.

The crew of Apollo 1 (L-R, White, Grissom, Chaffee). Image: NASA.

The crew of Apollo 1 (L-R, White, Grissom, Chaffee). Image: NASA.



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