Celestial Atlas
Cepheus <—     Cetus: The Whale     —> Chamaeleon
(possessive form Ceti, abbreviation Cet)
Hold the cursor over any Greek letter shown in the text to see its English transliteration
Constellations Bordering Cetus
(tba)

Cetus is one of the 48 ancient constellations recorded by Ptolemy.

Illustrations of Cetus
From Bayer's 1603 Uranometria
(Image Credit and © Tartu Observatory Virtual Museum; used by permission)
Portion of Bayer's Uranometria showing the region near Cetus
The horizontal bands at the top represent the Ecliptic (with degree markings) and the southern Zodiac

From Bode's 1801 Uranographia
(Image Credit and © Tartu Observatory Virtual Museum; used by permission)
Portion of Bode's Uranographia showing the region near Cetus

Unlike Bayer's maps, which only show naked-eye stars (the telescope not having been invented), Bode's maps show many fainter stars. In addition, several "new" constellations are shown to the south of the sea monster, which did not exist at the time of Bayer's work -- Apparatus Chemicus (an alteration of Lacaille's Le Fourneau, now called Fornax), Machina Electrica (now obsolete), and Apparatus Sculptoris (now Sculptor).


Map of Cetus
Modified version of Wikimedia Commons map by Torsten Bronger


Stars in Cetus

     Stars which have common names often have multiple names, so the common names shown (if any) cannot be considered authoritative. Right ascension and declination are given in 2000.0 coordinates.

α Cet

β Cet (Deneb Kaitos = Diphda) -- In early Arabic times, this star and Fomalhaut (a first-magnitude star to its west) were called the frogs, which is the source of the name Diphda. After Al Sufi translated ancient Greek texts into Arabic, Greek constellations replaced the Arabic ones, and this star, being on the western or "tail" side of the constellation (as shown in Bayer's map), became "the tail of the whale", or Deneb Kaitos. However, since the mid 20th century, the constellation has often been drawn with its head to the west and its tail to the east, placing "the tail of the whale" in the whale's mouth. As a result, the old Arabic name of the star has come into use again. Whether this serves any purpose save to confuse those trying to learn the name of the star is another matter, and is the reason Bayer created the designation "Beta Ceti".

γ Cet

δ Cet

ε Cet


Objects of Interest

NGC 73, a very faint barred spiral galaxy (RA 00 18 39, Dec -15 19 19).

Celestial Atlas
Cepheus <—     Cetus: The Whale     —> Chamaeleon