Eta Canis Minoris
Eta Canis Minoris is a binary star system in the equatorial constellation of Canis Minor. Its name is a Bayer designation that is Latinized from η Canis Minoris, and abbreviated Eta CMi or η CMi. The brighter component has an apparent visual magnitude of 5.25, which indicates it is faintly visible to the naked eye. Based on parallax measurements, the distance to this system is approximately from the Sun. It is drifting further away with a line of sight velocity of +17 km/s.
The primary component, η Canis Minoris A, is a yellow-white F-type giant with a stellar classification of F0 III. At the estimated age of 818 million years, it shows a high rate of spin with a projected rotational velocity of 54 km/s. The star has 2.2 times the mass of the Sun mass and is radiating 57.5 times the Sun's luminosity from its photosphere at an effective temperature of 7,505 K.
The companion star was first reported by S. W. Burnham in 1872. Designated η Canis Minoris B, it is an eleventh-magnitude star located at an angular separation of 4 arcseconds from the primary. At the distance of this system, this is equivalent to a physical separation of around from the main star, taking around 5,000 years to orbit it.