Genitive: Fornacis
Abbreviation: For
Size ranking: 41st
Origin: The 14 southern constellations of Nicolas Louis de Lacaille

An obscure constellation introduced by the Frenchman Nicolas Louis de Lacaille after his trip to the Cape of Good Hope to observe the southern stars in 1751–52. It lies tucked into a bend in the river Eridanus.

Lacaille originally called it le Fourneau on his 1756 planisphere and depicted it as a chemist’s furnace used for distillation. He Latinized the name to Fornax Chimiae on the 1763 edition of his planisphere.

It is sometimes said that Lacaille invented the constellation to honour his countryman Antoine Lavoisier, one of the founders of chemistry. This is a misunderstanding, since Lavoisier was only 13 years old when Lacaille’s chart of the southern constellations was first published. In fact, the connection with Lavoisier was due to Johann Bode who reinvented the constellation nearly half a century later in his Uranographia atlas of 1801. Bode’s depiction of Fornax (see illustration below) is based on Lavoisier’s diagram of his experiment to decompose water into its constituents of hydrogen and oxygen, as published in Traité élémentaire de chimie (1789). As part of his reinvention, Bode retitled the constellation Apparatus Chemicus, although most astronomers continued to use Lacaille’s original name.

In 1845 the English astronomer Francis Baily shortened its name to Fornax in his British Association Catalogue, acting on a suggestion by John Herschel that all Lacaille’s two-word names for constellations should be reduced to one. It has been known as Fornax ever since.

Fornax contains no stars brighter than fourth magnitude.

Chinese associations
In the Chinese constellation system, a triangle of faint stars in Fornax formed Tianyu, grain piled in ricks in the fields. The grain ricks were part of the overall harvest scene in this part of the sky that also included Fuzhi, the reaping sickle, in adjoining Sculptor, and granaries to the north in Cetus.

© Ian Ridpath. All rights reserved

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