Ascella - ζ Sagittarii (zeta Sagittarii)
Ascella, also designated as ζ Sagittarii (zeta Sagittarii), is a multiple giant star in the constellation of Sagittarius.
Ascella visual magnitude is 2.6, making it the 99th brightest star in the sky. Thanks to its high brightness, Ascella 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 Ascella:
Celestial coordinates and finder chart of Ascella
Ascella is situated south of the celestial equator, as such, it is more easily visible from the southern emisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Ascella are provided in the following table:
The simplified sky map below shows the position of Ascella in the sky:
Visibility of Ascella from your location
Digitized Sky Survey image of Ascella
The image below is a photograph of Ascella 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 Ascella is -0.015 arcsec per year in Right Ascension and -0.002 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of Ascella from the Sun and relative movement
Ascella is distant 89.05 light years from the Sun and it is moving far from the Sun at the speed of 22 kilometers per second.
Spectral properties of Ascella
Ascella belongs to spectral class A2 and has a luminosity class of III corresponding to a giant star.
The red dot in the diagram below shows where Ascella is situated in the Hertzsprung–Russell diagram.
Ascella star system properties
Ascella 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 Ascella double sysyem: