η Aquarii (eta Aquarii)
η Aquarii is a sub-giant star in the constellation of Aquarius.
η Aquarii visual magnitude is 4.02. Because of its moderate brightness, η Aquarii should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.
The table below summarizes the key facts about η Aquarii:
Celestial coordinates and finder chart of η Aquarii
η Aquarii 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 η Aquarii are provided in the following table:
The simplified sky map below shows the position of η Aquarii in the sky:
Visibility of η Aquarii from your location
Digitized Sky Survey image of η Aquarii
The image below is a photograph of η Aquarii 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 η Aquarii is 0.091 arcsec per year in Right Ascension and -0.056 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.
Distance of η Aquarii from the Sun and relative movement
η Aquarii is distant 183.46 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.
Spectral properties of η Aquarii
η Aquarii belongs to spectral class B9 and has a luminosity class of IV corresponding to a sub-giant star.
The red dot in the diagram below shows where η Aquarii is situated in the Hertzsprung–Russell diagram.