Your Guide to the Solar System and the Night Sky
This site is free and ad-free thanks to the support of our users. If you can, please consider a donation.
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:44  
clear_day Transit: 12:51  
SunsetSet: 18:57 south
sunny DaytimeWhat's Visible Now
All Constellations » Cancer » 

Tarf - β Cancri (beta Cancri)

Altitude: -0.8°   Azimuth: 285.9°   Direction: West-North-West

Tarf, also designated as β Cancri (beta Cancri), is a variable and double giant star in the constellation of Cancer.

Tarf visual magnitude is 3.52. Because of its moderate brightness, Tarf should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about Tarf:


Tarf - β Cancri (beta Cancri) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -0.8°
Azimuth: 285.9°
Direction: West-North-West

Celestial coordinates and finder chart of Tarf

Tarf 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 Tarf are provided in the following table:

08h 16m 30s
+09° 11’ 08”

The simplified sky map below shows the position of Tarf in the sky:

Finder chart Tarf - β Cancri (beta Cancri) star
Simplified finder chart for Tarf - β Cancri (beta Cancri).

Visibility of Tarf from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Tarf - β Cancri (beta Cancri) rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 80.8°
Max altitude: 47.7°
Azimuth: 279.2°

Digitized Sky Survey image of Tarf

The image below is a photograph of Tarf 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 Tarf is -0.044 arcsec per year in Right Ascension and -0.049 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Tarf - β Cancri (beta Cancri) star
DSS2 image of Tarf. The red arrow shows the motion of Tarf during the next 10000 years (-7.33 arcmin in Right Ascension and -8.17 arcmin in declination);

Distance of Tarf from the Sun and relative movement

Tarf is distant 290.29 light years from the Sun and it is moving far from the Sun at the speed of 22 kilometers per second.

89.05 pc
290.29 ly
22 km/s
-0.044 arcsec/year
-0.049 arcsec/year

Spectral properties of Tarf

Tarf belongs to spectral class K4 and has a luminosity class of III corresponding to a giant star.


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

HR Diagram
H-R diagram showing the position of Tarf. Attribution: Richard Powell / CC BY-SA

Tarf star system properties

Tarf 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 Tarf double sysyem:

29.2 arcsec

Alternative designations of Tarf

β Cancri
(beta Cancri)