1 Serpentis

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1 Serpentis is a red giant star in the Virgo constellation. It has an apparent magnitude of 5.5, so it is just barely visible without a telescope. It is a red clump giant, meaning it is fusing helium in its core.

The star is about 1.37 times as massive as the Sun, about 13.6 times larger in radius, and it shines roughly 75 times brighter. Its surface temperature is about 4,581 K, cooler than the Sun, and it is around 4.6 billion years old.

1 Serpentis lies about 322 light-years away from us. It moves through space with a radial velocity of about 20 km/s and a proper motion of roughly 60 mas per year in right ascension and −26 mas per year in declination.

There is a 10th-magnitude companion star about 86 arcseconds away. At the same distance as 1 Serpentis, they are likely physically bound and are separated by about 8,600 astronomical units. A more distant 10th-magnitude star is listed elsewhere, but it is not physically related.