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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:42  
clear_day Transit: 12:10  
SunsetSet: 17:40
sunny DaytimeWhat's Visible Now?
All Constellations » Pegasus » 

21 Pegasi

Altitude: 44.1°   Azimuth: 219.2°   Direction: South-West

21 Pegasi is a main-sequence star in the constellation of Pegasus.

21 Pegasi visual magnitude is 5.8. Because of its reltive faintness, 21 Pegasi should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of 21 Pegasi is 0.017 arcsec per year in Right Ascension and -0.012 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 21 Pegasi star
DSS2 image of 21 Pegasi. The red arrow shows the motion of 21 Pegasi during the next 10000 years (2.83 arcmin in Right Ascension and -2.00 arcmin in declination);

Key facts about 21 Pegasi

5.8
Main-sequence

21 Pegasi is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 44.1°
Azimuth: 219.2°
Direction: South-West

Celestial coordinates and finder chart of 21 Pegasi

21 Pegasi 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 21 Pegasi are provided in the following table:

22h 03m 19s
+11° 23’ 11”
70.66°
-33.92°
Pegasus

The simplified sky map below shows the position of 21 Pegasi in the sky:

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

Visibility of 21 Pegasi 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 21 Pegasi 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: 78.6°
Max altitude: 49.9°
Azimuth: 281.4°

Distance of 21 Pegasi from the Sun and relative movement

21 Pegasi is distant 540.63 light years from the Sun

165.84 pc
540.63 ly
0.017 arcsec/year
-0.012 arcsec/year

Spectral properties of 21 Pegasi

21 Pegasi belongs to spectral class B9 and has a luminosity class of V corresponding to a main-sequence star.

-0.30
B9V
11092K

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

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

Alternative designations of 21 Pegasi

SAO107625
SAO107625