21 Orionis

Above the horizon. Rise: 0:18 | Tran: 6:33 | Set: 12:45

Alt: 7.64° Az: 264.58° Direction: West

21 Orionis is a variable bright giant star of spectral class F5 in the constellation of Orion.

21 Orionis visual magnitude is 5.34. Because of its faintness, 21 Orionis 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 Orionis. The red arrow shows the motion of 21 Orionis during the next 10000 years (-2.83 arcmin in Right Ascension and -7.83 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 05h 20m 28s

Declination +02° 37’ 11”

Hour Angle 05h 24m 04s

Sideral Time 10h 44m 32s

J2000

Right Ascension 05h 19m 11s

Declination +02° 35’ 44”

Galactic Coordinates

Galactic Longitude 199.54°

Galactic Latitude -19.12°

Finder Chart

Simplified finder chart for 21 Orionis.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.34

Class Bright giant

Absolute magnitude 1.42

Spectral Type F5II

Color Index (B-V) 0.41

Temperature 6827K

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

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

Distance, Radial Speed, Proper Motion

21 Orionis is distant 197.94 light years from the Sun and it is moving far from the Sun at the speed of 11 kilometers per second.

Distance (parsec) 60.72

Distance (light year) 197.94

Radial Speed 11 km/s

Proper Motion RA -0.017 arcsec/y

Proper Motion Dec -0.047"/y

Alternative Designations

Flamsteed designation 21 Orionis

Henry Draper Catalogue HD34658

SAO Catalogue SAO112624

Hipparcos Catalogue HIP24817

Durchmusterung Catalogue BD+02 916

General Catalogue of Variable Stars 1922

Visibility from Your Location

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

Azimuth: 87.4° RISE 0:18

Max altitude: 41.1° TRANSIT 6:33

Azimuth: 272.6° SET 12:45

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

Location

Other stars in Orion