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public LocationGreenwich, UK
TimezoneEurope/London
Sunrise: 5:12 
Transit: 13:06 
Sunset: 20:59
sunny   (Daytime)   What's Visible Now?
All Constellations » Aries » 

21 Arietis

Above the horizon.  Rise: 22:45 | Tran: 7:11 | Set: 15:33
Alt: 63.43°   Az: 189.54°   Direction: South

21 Arietis is a double main-sequence star of spectral class F6 in the constellation of Aries.

21 Arietis visual magnitude is 5.58. Because of its faintness, 21 Arietis 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.

Image of 21 Arietis star
DSS2 image of 21 Arietis. The red arrow shows the motion of 21 Arietis during the next 10000 years (-14.67 arcmin in Right Ascension and -14.50 arcmin in declination);

Celestial Coordinates

Apparent

02h 17m 06s
+25° 09’ 22”
00h 18m 46s
02h 35m 53s

J2000

02h 15m 42s
+25° 02’ 35”

Galactic Coordinates

146.07°
-34.01°

Finder Chart

Finder chart 21 Arietis star
Simplified finder chart for 21 Arietis.

Magnitude, Color, Spectral Class

5.58
Main-sequence

2.17
F6V
6435K

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

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

Star System Properties

21 Arietis 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 21 Arietis double sysyem:

5.58
5.88
0.3
0.2 arcsec

Distance, Radial Speed, Proper Motion

21 Arietis is distant 156.96 light years from the Sun and it is moving towards the Sun at the speed of 44 kilometers per second.

48.15
156.96
-44 km/s
-0.088 arcsec/y
-0.087"/y

Alternative Designations

SAO75238
SAO75238

Visibility from Your Location

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

Azimuth: 64.8°
Max altitude: 63.7°
Azimuth: 295.2°