Epsilon Carinae


Distance (Light Years) 630 ± 60
Apparent Magnitude 1.86
Color (B-V)1.28

Names For This Star

According to Lynne Marie Stockman, the name "Avior" is a coinage of Great Britain's H. M. Nautical Almanac Office. See HMNAO Star Names for the story.

Description of the Star

The spectrum of Avior is a composite spectrum characteristic of a K3III giant and a B2V main sequence star. The giant would be an orange star with an effective temperature of 4100 K, a mass of about 4.6 times that of the sun, and a diameter about 20 times that of the sun. The spectral type implies a luminosity about 110 times that of the sun.

The main sequence companion would be much hotter at a temperature of 23,000 K. The spectral type implies a diameter of 6 times that of the sun, a mass of 16 times that of the sun, and a luminosity of 8800 times that of the sun. The luminosity of the system must be mainly due to this star, which is measured to be 1.96 magnitudes brighter than the giant.

The Hipparcos Catalogue mission found a separation 0.463 arc seconds between the two stars, corresponding to a projected distance of 90 AU between the stars. This distance is about 2.25 times the radius of the solar system out to Pluto.

Other Designations For This Star


Hipparcos Identifier (HIP Number)


Harvard Revised (HR Number)


Henry Draper Catalog (HD Number)


Bonner Durchmusterung (BD Number)

CP-59 1032
Smithsonian Astrophysical
Observatory compendium (SAO Number)

Fundamental Katalog (FK5 Number)



Copyright © 1998 - 2010 by Arnold V. Lesikar,
Professor Emeritus
Dept. of Physics, Astronomy, and Engineering Science,
St. Cloud State University,St. Cloud, MN 56301-4498

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