21 Arietis

Above the horizon. Rise: 3:29 | Tran: 11:51 | Set: 20:13

Alt: 45.01° Az: 253.08° Direction: West-South-West

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.

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

Right Ascension 02h 17m 09s

Declination +25° 09’ 35”

Hour Angle 03h 13m 25s

Sidereal Time 05h 30m 34s

J2000

Right Ascension 02h 15m 42s

Declination +25° 02’ 35”

Galactic Coordinates

Galactic Longitude 146.07°

Galactic Latitude -34.01°

Finder Chart

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Finder chart for 21 Arietis.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.58

Class Main-sequence

Absolute magnitude 2.17

Spectral Type F6V

Color Index (B-V) 0.49

Temperature 6435K

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

Main star magnitude 5.58

Secondary star magnitude 5.88

Magnitude difference 0.3

Separation 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.

Distance (parsec) 48.15

Distance (light year) 156.96

Radial Speed -44 km/s

Proper Motion RA -0.088 arcsec/y

Proper Motion Dec -0.087"/y

Alternative Designations

Flamsteed designation 21 Arietis

Henry Draper Catalogue HD13872

SAO Catalogue SAO75238

Hipparcos Catalogue HIP10535

Durchmusterung Catalogue BD+24 329

FK5 Catalogue 1059

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° RISE 3:29

Max altitude: 63.7° TRANSIT 11:51

Azimuth: 295.2° SET 20:13

Set Location

Other stars in Aries