Planet Earth
International Astronomical Union WGSN

IAU: Delphinus

Profile / Characteristics

English translationLatin declination and pronunciationsSize/ °²# stars
(visible)
the DolphinDelphinus – del-FINE-us, del-FIN-us
Delphini – del-FINE-eye, del-FIN-eye
18944

Main Star (brightest one):

DesignationHIP numbername in IAU-CSNbrightness
α DelHIP 101958Sualocin3.80 mag (V)

Our (modern) Explanation

Delphinus seems to be a Greek constellation. It was originally much larger, also covering todays constellation Equ that was invented by Ptolemy. There are some Greek tales about people rescued by dolphins, most popular the story of a famous poet who was theatened by pirats and saved by a dolphin.

Ancient Globes

depiction of this constellation on the Farnese Globe (2nd century CE)
depiction of this constellation on the Kugel Globe (1st century BCE)
depiction of this constellation on the Mainz Globe (2nd century CE)

Farnese Globe

Kugel Globe

Mainz Globe

Ancient Lore & Meaning

Aratus

Reference:
English translation by Douglas Kidd (1997).
Aratus: Phaenomena, Cambridge Classical Texts and Commentaries, Series Number 34

Online available: translation by Mair (1921) 

Pseudo-Eratosthenes

References:
French translation by:
Jordi Pàmias i Massana and Arnaud Zucker (2013). Ératosthènes de Cyrène – Catastérismes, Les Belles Lettres, Paris

English version in:
Robin Hard (2015): Eratosthenes and Hyginus Constellation Myths with Aratus’s Phaenomena, Oxford World’s Classics

Early Modern Interpretation

Contemporary

As one of their first tasks in the 1920s, the newly founded International Astronomical Union (IAU) established constellation standards. The Belgian astronomer Eugène Delporte was assigned to the task to define borders of constellations parallel to lines of declination and right ascension. They were accepted by the General Assembly in 1928. The standardized names and abbreviations had already been accepted in 1922 and 1925.  

current IAU-star chart
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