Gliese 581

Also known as HO Librae, HO Lib, GJ 581, BD-07 4003, Wolf 562, Zkh 217, NSV 7023, HIP 74995

Red dwarf star in the constellation Libra

Key facts

Constellation: Libra
Right ascension: 15 19 26.82694
Declination: −07 ° 43 ′ 20.1895 ″
Apparent magnitude v: 10.56 to 10.58
Evolutionary stage: Main sequence
Spectral type: M3V
Variable type: BY Dra

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Wikidata facts

Constellation: Libra
Child body: Gliese 581g
Distance from Earth: 6.3004
Radius: 0.3
Mass: 0.31
Variable-star type: rotating variable star
Image: Gliese 581 Artist's impression.jpg

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radial velocity: -9.75
Commons category: Gliese 581
topic's main category: Category:Gliese 581
catalog code: UBV M 5243
spectral class: dM3.0
apparent magnitude: 9.421787
effective temperature: 3498
parallax: 158.7183
epoch: J2000.0
metallicity: 0.03
absolute magnitude: 11.56
luminosity: 0.013
surface gravity: 100000
right ascension: 229.86177891146036
topic has template: Template:Gliese 581
right ascension component of proper motion: -1221.278
declination component of proper motion: -97.229
declination: -7.72227486040722
stellar rotational velocity: -1.32
age estimated by a dating method: 8

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Encyclopedic overview

Gliese 581 (/ˈɡliːzə/) is a red dwarf star of spectral type M3V which hosts a planetary system, 20.5 light-years (6.3 parsecs) away from Earth in the constellation Libra. Its estimated mass is about a third of that of the Sun, and it is the 101st closest known star system to the Sun. Gliese 581 is one of the oldest, least active M dwarfs known. Its low stellar activity improves the likelihood of its three planets retaining significant atmospheres, and lessens the sterilizing impact of stellar flares.

History of observations

Excerpted from Wikipedia’s “Gliese 581” article, available under the CC BY-SA 4.0 licence.

Gallery (3)

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