HR4021 is a variable and multiple star in the constellation of Ursa Major.
HR4021 visual magnitude is 6.66. Because of its reltive faintness, HR4021 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 HR4021:
Celestial coordinates and finder chart of HR4021
HR4021 is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR4021 are provided in the following table:
The simplified sky map below shows the position of HR4021 in the sky:
Visibility of HR4021 from your location
Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
HR4021 is circumpolar and transits at 22:09 UTC (altitude: 70.4°)
Digitized Sky Survey image of HR4021
The image below is a photograph of HR4021 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 HR4021 is -0.031 arcsec per year in Right Ascension and -0.048 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of HR4021 from the Sun and relative movement
HR4021 is distant 304.67 light years from the Sun and it is moving far from the Sun at the speed of 11 kilometers per second.
Spectral properties of HR4021
HR4021 belongs to spectral class A7
The red dot in the diagram below shows where HR4021 is situated in the Hertzsprung–Russell diagram.
HR4021 star system properties
HR4021 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 HR4021 double sysyem: