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Alpha Caeli

Although the double star is the brightest in its constellation, it gains as good as none scientific attention. The exact separation of the two components is a minimum value, modern measurings aren't available.
Star A is a yellowish main sequence star or maybe a weak Delta Scuti variable, whereas star B is a red dwarf and flare star.

Constellation: Caelum
Distance: 65.7 light-years
Space between Alpha Caeli A and B: at least 1000 AU
Orbit period of Alpha Caeli A and B: at least 130 years

Alpha Caeli A

Spectral class: F2
Visual magnitude: 4.46
Luminosity: 5.2 * Sun
Mass: 1.5 * Sun
Diameter: 1.5 * Sun
  

Alpha Caeli B

Spectral class: M0.5
Visual magnitude: 12.5
Luminosity: 0.01 * Sun
Mass: 0.3 * Sun

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05/16/2006

     Alpha Caeli
The B star isn't visible because it is outshined by Alpha Caeli A. Near the star a probably far distant giant elliptic galaxy can be seen (at the upper left).
Photo: ESO Online Digitized Sky Survey
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