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HD 47500, also known as HR 2446, is a binary star in the southern constellation Columba. The primary has an apparent magnitude of 5.91, making it faintly visible to the naked eye if viewed under ideal conditions. As for the companion, its visual magnitude is 7.51. The system is located relatively far at a distance of 1,120 light years based on parallax measurements, and is receding with a heliocentric radial velocity of 21 km/s.

The binary nature of this system was first discovered by Richard Alfred Rossiter in 1942. Their current separation is half of an arcsecond, making it difficult to measure the components properties. Nevertheless, the secondary component is located along a position angle of 4° as of 1999.

HD 47500 has a stellar classification of B6 IV-V, a B-type star with a luminosity class intermediate between a subgiant and main sequence star. Hube (1970) gave the primary a slightly cooler class of B7 III, indicating that it is already a giant star, while Houk (1982) gave it a class of B5/7 IV, intermediate between a B5 and B7 subgiant. Nevertheless, it is estimated to be 34 million years old, having completed 98.5% of its main sequence lifetime. HD 47500 A has 5.01 times the mass of the Sun and an enlarged radius of 7.33 R_☉. It radiates 1,482 times the luminosity of the Sun. from its photosphere at an effective temperature of 14,703 K, giving it a bluish-white hue. Unlike most hot stars, the object spins modestly with a projected rotational velocity of 36 km/s.

References

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v t e Constellation of Columba
List of stars in Columba Columba in Chinese astronomy
Stars	Bayer α (Phact) β (Wazn) γ δ ε η θ (Elkurud) κ λ (Tsze) μ ν ν ξ ο π π σ Variable WZ AF AP HR 1721 1758 1835 1877 1958 2069 2082 2131 2149 2263 2288 2399 2411 2445 2446 HD 43848 Other NGTS-1 NGTS-3 WASP-63
Exoplanets NGTS-1b NGTS-3Ab NGTS-4b WASP-63b
Star clusters NGC 1851
Galaxies	NGC 1792 1808 1989 1992 2090 Other ESO 306-17 PKS 0521-365
Category

• B-type subgiants
• Binary stars
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects
• Gould objects
• Columba (constellation)
• Durchmusterung objects
• B-type main-sequence stars