HD 28204, also designated as HR 1401, is a spectroscopic binary[16] located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.93,[2] making it faintly visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of 331 light-years and it is currently receding with a heliocentric radial velocity of 9 km/s.[5] At its current distance, HD 28204's brightness is diminished by 0.18 magnitudes due to interstellar extinction and it has an absolute magnitude of +0.91.[6]
HD 28204 is a single-lined spectroscopic binary consisting of an Am star and an unseen companion, as the primary is the only one detectable in the spectrum. With a mass of 0.474 M☉,[9] the companion might be a K-type main-sequence star. Both stars take 4.2 days to revolve around each other in a nearly circular orbit, which is somewhat constrained.[7] HD 28204 has two optical companions: a 12th magnitude star located 39" away along a position angle of 257° and a 14th magnitude star located 27.3" along a position angle of 55°.[17]
The visible component has a stellar classification of kA8hF0mF2,[3] indicating that it is an Am star with the calcium K-lines of an A8 star, the hydrogen lines of a F0 star, and the metallic lines of a F2 star. It has 1.68 times the mass of the Sun[9] and an enlarged radius 3.48 times that of the Sun.[10] It radiates 35.7 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 7,320 K,[12] giving it the typical white hue of an A-type star. It is slightly metal deficient with an iron abundance of [Fe/H] = −0.15 or 72% that of the Sun's.[13] Like many Am stars it spins slowly, having a projected rotational velocity of 23 km/s.[3]
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