K-type giant star in the constellation Cancer
1 Cancri is a single[ 2] star in thezodiac constellation ofCancer , positioned near the border withGemini at a distance of around 467 light years from the Sun. It is barely visible to the naked eye as a dim, orange-hued star with anapparent visual magnitude of 5.97. The object is moving further from the Earth with a heliocentricradial velocity of +14 km/s.
This is anevolved giant star with astellar classification of K3− III,[ 3] having exhausted the hydrogen at its core and expanded. It is specified as a spectral standard for that type.[ 3] Theangular diameter of the star measured from alunar occultation is 2.1± 0.6 mas ,[ 9] which, at its estimated distance, equates to a physical radius of about 19 times theradius of the Sun . It is radiating 199 times theSun's luminosity from its enlargedphotosphere at aneffective temperature of 4,231 K .
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