21 Herculis is a star in the constellation of Hercules.
21 Herculis visual magnitude is 5.85. Because of its reltive faintness, 21 Herculis should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.
The table below summarizes the key facts about 21 Herculis:
Celestial coordinates and finder chart of 21 Herculis
21 Herculis is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 21 Herculis are provided in the following table:
The simplified sky map below shows the position of 21 Herculis in the sky:
Visibility of 21 Herculis from your location
Today's 21 Herculis rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):
Digitized Sky Survey image of 21 Herculis
The image below is a photograph of 21 Herculis from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of 21 Herculis is 0.003 arcsec per year in Right Ascension and 0.014 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of 21 Herculis from the Sun and relative movement
21 Herculis is distant 341.36 light years from the Sun and it is moving towards the Sun at the speed of 33 kilometers per second.
Spectral properties of 21 Herculis
The red dot in the diagram below shows where 21 Herculis is situated in the Hertzsprung–Russell diagram.