33_Pegasi
33 Pegasi
Star in the constellation Pegasus
33 Pegasi is the Flamsteed designation for a visual binary star in the northern constellation of Pegasus. It has an apparent visual magnitude of 6.2,[2] placing it near the limit of naked eye visibility. Measurements show an annual parallax shift of 0.0298125″,[1] which is equivalent to a distance of 109 ly (33 pc) from the Sun. It is drifting further away with a radial velocity of 24 km/s.[2]
The primary component of this system is a main sequence star with a visual magnitude of 6.4[3] and a stellar classification of F7 V.[4] It is nearly as old as the Sun with an estimated age of 4.1 billion years, but has a lower abundance of elements other than hydrogen and helium. The star has 1.3 times the mass[6] and radius[7] of the Sun. The stellar atmosphere has an effective temperature of 6,169 K,[9] giving it the yellow-white glow of an F-type star.[11]
A faint, magnitude 9.3 companion star is located at an angular separation of 0.420 arc seconds along a position angle of 0.0°.[3] The pair have a projected separation of 15.6 AU[6] with an orbital period of about 250 years.[12]