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🌎  Greenwich, United Kingdom [change]

21 Pegasi

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 skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 21 Pegasi:

21 Pegasi is above the horizon from Greenwich, United Kingdom [change]. Altitude: 8°.

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”

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 [change]
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 [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 78.6°
Max altitude: 49.9°
Azimuth: 281.4°
21 Pegasi is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 21 Pegasi

The image below is a photograph of 21 Pegasi 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 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);

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.


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