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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
north SunriseRise: 7:52  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sleep NighttimeWhat's Visible Now?
All Constellations » Pegasus » 

40 Pegasi

Altitude: 15.2°   Azimuth: 282.4°   Direction: West-North-West

40 Pegasi is a double bright giant star in the constellation of Pegasus.

40 Pegasi visual magnitude is 5.82. Because of its reltive faintness, 40 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 40 Pegasi:

Bright giant

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

Altitude: 15.2°
Azimuth: 282.4°
Direction: West-North-West

Celestial coordinates and finder chart of 40 Pegasi

40 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 40 Pegasi are provided in the following table:

22h 38m 52s
+19° 31’ 19”

The simplified sky map below shows the position of 40 Pegasi in the sky:

Finder chart 40 Pegasi star
Simplified finder chart for 40 Pegasi.

Visibility of 40 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 40 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: 70.5°
Max altitude: 58.0°
Azimuth: 289.5°

Digitized Sky Survey image of 40 Pegasi

The image below is a photograph of 40 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 40 Pegasi is -0.042 arcsec per year in Right Ascension and -0.099 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 40 Pegasi star
DSS2 image of 40 Pegasi. The red arrow shows the motion of 40 Pegasi during the next 1000 years (-0.70 arcmin in Right Ascension and -1.65 arcmin in declination);

Distance of 40 Pegasi from the Sun and relative movement

40 Pegasi is distant 381.29 light years from the Sun and it is moving towards the Sun at the speed of 20 kilometers per second.

116.96 pc
381.29 ly
-20 km/s
-0.042 arcsec/year
-0.099 arcsec/year

Spectral properties of 40 Pegasi

40 Pegasi belongs to spectral class G8 and has a luminosity class of II corresponding to a bright giant star.


The red dot in the diagram below shows where 40 Pegasi is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 40 Pegasi. Attribution: Richard Powell / CC BY-SA

40 Pegasi star system properties

40 Pegasi is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the 40 Pegasi double sysyem:

1.5 arcsec

Alternative designations of 40 Pegasi