Omicron Arietis
Omicron Arietis is a single, blue-white-hued star in the northern constellation of Aries. Its name is a Bayer designation that is Latinised from ο Arietis, and abbreviated Omicron Ari or ο Ari. This star has an apparent [visual magnitude] of +5.78, which means it is dimly visible to the naked eye. Based upon an annual parallax shift of as seen from Earth, it is located approximately 560 light-years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.22 due to interstellar dust.
This is a B-type main-sequence star with a stellar classification of B9 Vn. The 'n' suffix indicates that it has nebulous absorption lines in its spectrum, which are caused by the Doppler effect and rapid rotation. Indeed, it has a projected rotational velocity of 225 km/s. The star has an estimated 2.8 times the mass of the Sun and about 4.3 times the Sun's radius. It is radiating energy from its photosphere at 217 times the Sun's luminosity with an effective temperature of.