K1V

K1V is primarily a designation used in astronomy to refer to a specific type of star. In the Morgan–Keenan (MK) spectral classification system, K1V denotes a K-type star with luminosity class V, meaning it is a main-sequence (dwarf) star that fuses hydrogen in its core. The K1 subclass places the star among cooler, orange-hued stars, warmer than later K types but cooler than G-type stars.

Characteristics of K1V stars include lower temperature and luminosity compared to the Sun, making them smaller and less bright while remaining on the main sequence for long periods. Their spectra show prominent metallic lines and molecular features such as titanium oxide, which help distinguish them from hotter stars.

The term K1V is thus most commonly encountered in stellar classification and cataloging. Outside of astronomy, the alphanumeric string K1V can also be used as a model or product code in various industries, but such uses are not standardized and depend on context. See also: MK system, K-type stars, main-sequence stars.