|Right ascension||21 h 27 m 43 s to 23 h 27 m 04 s|
|declination||−56 ° 23 ′ 27 ″ to −36 ° 18 ′ 46 ″|
|Completely visible||33.8 ° N to 90 ° S|
|Observation time for Central Europe||October - November
|Number of stars brighter than 3 mag||2|
|Brightest star (size)||Al Nair (1.74)|
clockwise from north )
The crane from the Uranometria by Johann Bayer
The crane has roughly the shape of an inverted Y. Two of its stars, α and β Gruis, are strikingly bright and have a clear color contrast. α Gruis glows bluish white, while β Gruis glows orange.
From Germany, on very clear autumn nights, at most the northernmost part of the crane with the star γ Gruis can be seen. It is fully visible only south of the 35th parallel .
Originally, the stars were assigned to the southern fish constellation .
At the end of the 16th century, the Dutch navigators and explorers Pieter Dirkszoon Keyser and Frederick de Houtman described the stars as an independent constellation Den Reygher ("the heron") crane . Petrus Plancius and Jodocus Hondius put him in 1598 respectively. 1600 as Phoenicopterus ("Phoenix"). Johann Bayer then took over the constellation under its current name in his 1603 celestial atlas Uranometria .
|B.||Names or other designations||Vmag||Lj||Spectral class|
|β||Beta Gruis||2.07||170||M5 III|
|δ 1||3.97||150||G6 III|
|δ 2||4.12||400||M4 III|
|π||5.3||200||F2 + C|
|τ 3||5.71||A4m A5-F2|
|τ 1||6.03||106||G0 V|
|τ 2||HD 216655||7.03||46||G3 / 6|
|π||5.6 / 6.6||261 "|
The stars Delta 1 and Delta 2 Gruis, which are roughly equally bright in the night sky, appear to the naked eye as a double star system , as they are only 16.1 arc minutes apart. It is only an asterism , however, because the two stars are actually 150 and 450 light years away from Earth.
There are several galaxies in the northeastern part of the crane . A telescope with an opening of at least 15 cm is required for observation.
- Ian Ridpath: Startales. Chapter 1