Okab - ζ Aquilae (zeta Aquilae)
Okab, also designated as ζ Aquilae (zeta Aquilae), is a variable and multiple hypergiant star in the constellation of Aquila.
Okab visual magnitude is 2.99. Thanks to its high brightness, Okab is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.
The table below summarizes the key facts about Okab:
Celestial coordinates and finder chart of Okab
Okab 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 Okab are provided in the following table:
The simplified sky map below shows the position of Okab in the sky:
Visibility of Okab from your location
Today's Okab - ζ Aquilae (zeta Aquilae) 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 Okab
The image below is a photograph of Okab 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 Okab is -0.005 arcsec per year in Right Ascension and -0.096 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.
Distance of Okab from the Sun and relative movement
Okab is distant 83.21 light years from the Sun and it is moving towards the Sun at the speed of 25 kilometers per second.
Spectral properties of Okab
Okab belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.
The red dot in the diagram below shows where Okab is situated in the Hertzsprung–Russell diagram.
Okab star system properties
Okab is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the Okab double sysyem: