21 Cassiopeiae
21 Cassiopeiae is a variable and double sub-giant star of spectral class A2 in the constellation of Cassiopeia.
21 Cassiopeiae visual magnitude is 5.66. Because of its faintness, 21 Cassiopeiae is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.
Celestial Coordinates
Apparent
J2000
Galactic Coordinates
Finder Chart
Simplified finder chart for 21 Cassiopeiae.
Magnitude, Color, Spectral Class
The red dot in the diagram below shows where 21 Cassiopeiae is situated in the Hertzsprung–Russell diagram.
Star System Properties
21 Cassiopeiae is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the 21 Cassiopeiae double sysyem:
Distance, Radial Speed, Proper Motion
21 Cassiopeiae is distant 290.04 light years from the Sun and it is moving far from the Sun at the speed of 9 kilometers per second.
Alternative Designations
Visibility from Your Location
21 Cassiopeiae is circumpolar and transits at 23:19 UTC (altitude: 66.4°)