The Southern Cross or Crux is a constellation that is made up of 5 stars. The distances of these stars varies, with the closest being 89 lightyears from our solar system. The distances of each of the stars (in light years (ly) is detailed below.
Alpha Crucis = 320ly
Beta Crucis (also known as Mimosa or Becrux) = 280ly
Delta Crucis = 345ly
Gamma Crucis (Gacrux) = 89ly, this is the closest Red Giant to our solar system
Epsilon Crucis = 228ly
Actually, it is five: Alpha Crucis, Beta Crucis, Gamma Crucis, Delta Crucis, and Epsilon Crucis.
Because it is still really far from earth
Regulus is not in the 20th brightest stars as seen from Earth. It is the 22nd brightest star, 23nd if you include the sun.In terms of absolute magnitude it is way down the list, there are many hundrededs of catalogued stars more luminous.List of brightest stars and (apparent magnitude.)Sun (-26.74)Sirius, Alpha Canus Magoris (-1.46)Canopus, Alpha Carinae (-0.72)Arcturus, Alpha Bootes (-0.04 variable)Alpha Centauri A (-0.01)Vega, Alpha Lyrae (0.03)Rigel, Beta Orionis (0.18)Procyon, Alpha Canus Minoris (0.34)Achernar, Alpha Eridani (0.50)Betelgeuse, Alpha Orionis (0.58 variable)Hadar, Beta Centauri (0.60)Capella A, Alpha Aurigae A (0.71)Altair, Alpha Aquilae (0.77)Aldebaran, Alpha Tauri (0.85 variable)Capella B, Alpha Aurigae B (0.96)Spica, Alpha Virginis (1.04)Antares, Alpha Scorpii (1.09)Pollox, Beta Geminorum (1.15)Fomalhault, Alpha Piscis Austrini (1.16)Deneb, Alpha Cigni (1.25)Mimosa, Beta Crucis (1.30)Alpha Centauri B (1.33)Regulus, Alpha Leonis (1.35)Acrux A, Alpha Crucis A (1.40)Adara, Epslion Canis Majoris (1.51)Gacrux, Gamma Crucis (1.63)
Alpha Centauri is 4.365 light-years from the Sun. One light-year is 9.46*1012 kilometers. So: 4.365*9.46*1012= 4.13*1013 kilometers
This star is about 65 light years from Earth.
Actually, it is five: Alpha Crucis, Beta Crucis, Gamma Crucis, Delta Crucis, and Epsilon Crucis.
Alpha Crucis, Beta Crucis, Delta Crucis, Gamma Crucis, and Epsilon Crucis,
The main stars of theSouthern Cross (or Crux) are:-Acrux Alpha Crucis at ~ 320 LyMimosa or Becrux Beta Crucis ~ 350 lyDelta Crucis ~ 360 lyGamma Crucis or Gacrux ~ 80 lyEpsilon Crucis ~ 380 lySee link for more information
The four major stars in the constellation Crux (Latin for 'cross'), or the Southern Cross, are Alpha Crucis (Acrux), Beta Crucis (also known as Mimosa or Becrux), Gamma Crucis(Gacrux) and Delta Crucis (Decrux). Some also include Epsilon Crux (Juxta Crucem) on the list although it is not actually part of the Cross itself.
In the Southern Cross (Crux), the stars are arranged as follows: Alpha Crucis (Acrux) is the brightest and located at the top of the cross, while Beta Crucis (Mimosa) is to the left. Gamma Crucis (Gacrux) is at the bottom of the cross, and Delta Crucis is positioned to the right of Beta. Epsilon Crucis is often considered a less prominent member of the constellation and is located near the center of the cross.
They are called Gamma Crucis and Alpha Crucis (sometimes nicknamed "Gacrux" and "Acrux")
Roughly 4.3 light years.
The Southern Cross constellation, also known as Crux, is made up of four main stars: Alpha Crucis (Acrux), Beta Crucis (Mimosa), Gamma Crucis (Gacrux), and Delta Crucis (Delta Crucis). Acrux is the brightest star in the constellation, while the other three stars form a distinctive cross shape. This constellation is prominent in the southern hemisphere and serves as a navigational aid for travelers.
The closest red giant to Earth is a star named Gacrux (also called Gamma Crucis). It is 88 light years away from us and can be seen in the constellation of the Southern Cross.
Because it is still really far from earth
Alpha Centuri is roughly 4.1626325x1018 centimeters from the Sun. The distance from the Earth varies depending on where we are in our orbit..
Regulus is not in the 20th brightest stars as seen from Earth. It is the 22nd brightest star, 23nd if you include the sun.In terms of absolute magnitude it is way down the list, there are many hundrededs of catalogued stars more luminous.List of brightest stars and (apparent magnitude.)Sun (-26.74)Sirius, Alpha Canus Magoris (-1.46)Canopus, Alpha Carinae (-0.72)Arcturus, Alpha Bootes (-0.04 variable)Alpha Centauri A (-0.01)Vega, Alpha Lyrae (0.03)Rigel, Beta Orionis (0.18)Procyon, Alpha Canus Minoris (0.34)Achernar, Alpha Eridani (0.50)Betelgeuse, Alpha Orionis (0.58 variable)Hadar, Beta Centauri (0.60)Capella A, Alpha Aurigae A (0.71)Altair, Alpha Aquilae (0.77)Aldebaran, Alpha Tauri (0.85 variable)Capella B, Alpha Aurigae B (0.96)Spica, Alpha Virginis (1.04)Antares, Alpha Scorpii (1.09)Pollox, Beta Geminorum (1.15)Fomalhault, Alpha Piscis Austrini (1.16)Deneb, Alpha Cigni (1.25)Mimosa, Beta Crucis (1.30)Alpha Centauri B (1.33)Regulus, Alpha Leonis (1.35)Acrux A, Alpha Crucis A (1.40)Adara, Epslion Canis Majoris (1.51)Gacrux, Gamma Crucis (1.63)