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.
They are called Gamma Crucis and Alpha Crucis (sometimes nicknamed "Gacrux" and "Acrux")
Roughly 4.3 light years.
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)
Alpha Lupi is 550 ly from Earth. It is a giant hot blue star of type B1.5. It has also been classified as a Beta Cepheid Variable.
Ampney Crucis's population is 609.