HD 195019

HD 195019 is a binary star system in the northern constellation of Delphinus. The brighter star has a close orbiting exoplanet companion. This system is located at a distance of 122 light years from the Sun based on parallax measurements, but it is drifting closer with a radial velocity of −91.3 km/s. Although it has an absolute magnitude of 4.01, at that distance the system is considered too faint to be viewed with the naked eye, having a combined apparent visual magnitude of 6.87. However, it should be readily visible with a pair of binoculars or a small telescope.

The spectrum of the primary member, designated component A, presents as a G-type main-sequence star with a stellar classification of G1V. An older stellar classification of G3 V/IV suggested it may be near the end of its main sequence lifespan and is evolving into a subgiant star. This is an older star with an estimated age of nearly 8 billion years and a low level of magnetic activity in its chromosphere. The abundance of iron is near solar. The star has a mass similar to the Sun but a larger radius. It is radiating 2.23 times the luminosity of the Sun from its photosphere at an effective temperature of 5,825 K.

The co-moving companion, component B, was first reported by G. W. Hough in 1881. As of 2016, it is located at an angular separation of $$ along a position angle of 334° relative to the primary. This corresponds to a projected separation of $$. This is a K-type star with 70% of the mass of the Sun and is magnitude 10.60.

Planetary system
In 1998, a planet was discovered at Lick Observatory utilizing a radial velocity method, orbiting around Star HD 195019 A. A search of astrometric observations from Hipparcos suggested this may be a stellar object in a near polar orbit. However, interferometric observations ruled out a stellar companion in this orbit with high likelihood.