Reticulate (constellation)
See also: Reticle
The Réticule is a Constellation of the Southern hemisphere, one of smallest and the least luminous of the sky.
History
The constellation was created by Jakob Bartsch at the 17th century which named it the Rhombe . Reintroduced by Nicolas-Louis de Lacaille in 1752, it took the Rhombic name of Réticule before being simply named Réticule at the 19th century. Like several other modern constellations, it bears the name of a scientific apparatus, a reticle being an instrument making it possible to measure the position of the star S.
Observation of stars
; Localization of the constellation The constellation is located starting from Achernar, terminus southern of Éridan. In the south of this star one locates initially the male Hydre, and with ~10° in the south of Achernar appreciably one finds a small alignment ENE-OSO, formed by small intermediate stars of the male Hydre, and more with the East a package of stars which form the reticle. Still more to the East, one falls on α from the Dorade.; Form constellation The constellation is not very brilliant, but its collected enough form makes all the same it relatively easy to locate.
The form itself does not present private interest.
Principal stars
See also: List of stars of the Reticle
α Reticuli
The principal star of the Reticle is α Reticuli, a giant star of a Magnitude connects of 3,33. It is a star distant giantess of 160 light-years, 100 times more luminous than the Sun and 20 times broader. She almost does not seem to rotate, her rotation being too weak to be measured.She has a companion magnitude connect 12, distant of 2.450 ua and describing a Orbit in 60.000 years.
Other stars
ζ Reticuli is a star doubles which can be solved with the naked eye with the proviso of having an excellent sight and of to have good conditions of observation because the two stars which compose it are in extreme cases of the visibility: ζ ² Ret is of magnitude 5,24 and ζ1 Ret is magnitude 5,54.HD 23079 has a planet 2,61 times more massive than Jupiter, orbiting in 738,459 days with the distance from 1,65 ua, just as HD 27442 (a star doubles), with a planet of 1,28 times Jupiter mass turning on an orbit quasi-circular of 1,18 ua in 423,841 days.
Celestial objects
The spiral galaxies NGC 1313 - a Radiogalaxie - and NGC 1559 are also in this constellation.
See too
- List of stars of the Reticle
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