HR 2831 has an apparent companion star nearby to the southwest. This is actually an unrelated star, HD 58390, which lies much closer to the Solar System than HR 2831. Though HD 58390 is a giantstar some three times more luminous than the Sun, it is significantly outshone by the supergiantHR 2831 far beyond, which appears brighter in the sky despite its immensely greater distance. Imagery provided by Aladin sky atlas
* It is difficult to calculate a precise distance value for objects as far away as HR 2831. Its most recent GAIA data gives a parallax value of just 0.3167, which implies a distance of 10,299 light years, but with such a small parallax figure there is considerable margin for error (perhaps as much as a thousand light years). If the estimated distance of about ten thousand light years (or a little over three thousand parsecs) is even close to correct, then HR 2831 - though it appears faint as seen from Earth - must be an exceptionally luminousstar, generating tens of thousands of times more energy than the Sun.
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