21 Cancri

Above the horizon. Rise: 3:05 | Tran: 9:57 | Set: 16:49

Alt: 33.08° Az: 117.87° Direction: East-South-East

21 Cancri is a double giant star of spectral class M2 in the constellation of Cancer.

21 Cancri visual magnitude is 6.08. Because of its faintness, 21 Cancri 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.

DSS2 image of 21 Cancri. The red arrow shows the motion of 21 Cancri during the next 10000 years (0.67 arcmin in Right Ascension and -3.83 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 08h 25m 16s

Declination +10° 33’ 03”

Hour Angle 20h 44m 27s

Sideral Time 05h 09m 43s

J2000

Right Ascension 08h 23m 55s

Declination +10° 37’ 54”

Galactic Coordinates

Galactic Longitude 213.68°

Galactic Latitude 25.32°

Finder Chart

Simplified finder chart for 21 Cancri.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 6.08

Class Giant

Absolute magnitude -1.59

Spectral Type M2III

Color Index (B-V) 1.49

Temperature 3809K

The red dot in the diagram below shows where 21 Cancri is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 21 Cancri. Attribution: Richard Powell / CC BY-SA

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:

Main star magnitude 6.08

Secondary star magnitude 9.38

Magnitude difference 3.3

Separation 1 arcsec

Distance, Radial Speed, Proper Motion

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.

Distance (parsec) 341.30

Distance (light year) 1,112.63

Radial Speed 3 km/s

Proper Motion RA 0.004 arcsec/y

Proper Motion Dec -0.023"/y

Alternative Designations

Flamsteed designation 21 Cancri

Henry Draper Catalogue HD70734

SAO Catalogue SAO97788

Hipparcos Catalogue HIP41163

Durchmusterung Catalogue BD+11 1830

Aitken Double Star Catalogue ADS6787

Visibility from Your Location

Today's 21 Cancri rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 79.4° RISE 3:05

Max altitude: 49.1° TRANSIT 9:57

Azimuth: 280.6° SET 16:49

Name:	Greenwich, UK
Latitude:	51° 28' 48.0" N
Longitude:	0° 0' 0.0" E
Timezone:	Europe/London

Location

Other stars in Cancer