59 Serpentis, also known as d Serpentis, is a multiple star in the

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the e ...

Serpens. The system shows irregular variations in brightness between magnitudes 5.17 and 5.29.

Components

59 Serpentis appears as a close pair of stars, of 5th magnitude and 7th magnitude respectively, separated by four arc-seconds. The brighter of the two is itself an even closer binary with the two stars separated by only , and only when they were first detected. The stars are designated Aa, Ab, and B. The primary star, component Aa, is a G0 giant. Component Ab is

spectroscopic binary A binary star is a system of two star, stars that are gravity, gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved using a telescope as separa ...

with a period of 1.85 days; the two stars are very similar A-class

main sequence In astronomy, the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Her ...

stars. Component B is an F5V possible astrometric binary, but with little known about the orbit or the possible companion. A much fainter star away is also thought to be a member of the system, having a common proper motion and similar

Gaia In Greek mythology, Gaia (; from Ancient Greek , a poetical form of , 'land' or 'earth'),, , . also spelled Gaea , is the personification of the Earth and one of the Greek primordial deities. Gaia is the ancestral mother—sometimes parthenog ...

parallax, and is designated as component C.

References

{{DEFAULTSORT:59 Serpentis Serpens (constellation) Serpentis, d Serpentis, 59 A-type main-sequence stars G-type giants Irregular variables 6918 169985 090441 Durchmusterung objects