21 Cancri is a double giant star in the constellation of Cancer.
21 Cancri visual magnitude is 6.08. Because of its reltive faintness, 21 Cancri 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 21 Cancri:
Celestial coordinates and finder chart of 21 Cancri
21 Cancri 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 21 Cancri are provided in the following table:
The simplified sky map below shows the position of 21 Cancri in the sky:
Visibility of 21 Cancri from your location
Location: Greenwich, United Kingdom
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Today's 21 Cancri 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 21 Cancri
The image below is a photograph of 21 Cancri 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 21 Cancri is 0.004 arcsec per year in Right Ascension and -0.023 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of 21 Cancri from the Sun and relative movement
21 Cancri is distant 1,112.63 light years from the Sun and it is moving far from the Sun at the speed of 3 kilometers per second.
Spectral properties of 21 Cancri
21 Cancri belongs to spectral class M2 and has a luminosity class of III corresponding to a giant star.
The red dot in the diagram below shows where 21 Cancri is situated in the Hertzsprung–Russell diagram.
21 Cancri star system properties
21 Cancri is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the 21 Cancri double sysyem: