# Rasalgethi (α Her)

Rasalgethi (α Her) is a double star in the constellation Hercules, magnitude 3.5.

A variable red supergiant whose companion looks greenish by contrast. Its components (magnitudes 3.5 and 5.4) lie 4.9″ apart at PA 101° (measured 2025).

## When and where to see it

It is best placed in the evening sky around July, when it crosses the meridian at about 10 pm local time (around midnight in June). It can be seen from everywhere north of 76°S and never sets north of 76°N.

At its highest it stands 54° up from 50°N, 69° up from 35°N, 76° up from the equator, 41° up from 35°S.

## Facts

- Type: Double star
- Constellation: Hercules
- Designations: α Her, Alpha Herculis, α¹ Her, Alpha¹ Herculis, 64 Her, 64 Herculis, STF 2140, HIP 84345
- Magnitude: 3.5
- Position: RA 17h 14.6m, Dec +14° 23′ (J2000)

Open AstroPilot to see when Rasalgethi (α Her) is highest tonight from your location, how easy it is with your telescope or binoculars, and an eyepiece view. https://astropilot.space/object/rasalgethi