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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: 6:35  
clear_day Transit: 12:10  
SunsetSet: 17:45
sunny DaytimeWhat's Visible Now?
All Constellations » Pegasus » 

σ Pegasi (sigma Pegasi)

Altitude: 41.2°   Azimuth: 137.3°   Direction: South-East

σ Pegasi is a double sub-giant star in the constellation of Pegasus.

σ Pegasi visual magnitude is 5.16. Because of its reltive faintness, σ 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 σ Pegasi is 0.522 arcsec per year in Right Ascension and 0.044 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of σ Pegasi (sigma Pegasi) star
DSS2 image of σ Pegasi. The red arrow shows the motion of σ Pegasi during the next 1000 years (8.70 arcmin in Right Ascension and 0.73 arcmin in declination);

Key facts about σ Pegasi

5.16
Sub-giant

σ Pegasi (sigma Pegasi) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 41.2°
Azimuth: 137.3°
Direction: South-East

Celestial coordinates and finder chart of σ Pegasi

σ 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 σ Pegasi are provided in the following table:

22h 52m 24s
+09° 50’ 08”
80.87°
-43.1°
Pegasus

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

Finder chart σ Pegasi (sigma Pegasi) star
Simplified finder chart for σ Pegasi (sigma Pegasi).

Visibility of σ 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 σ Pegasi (sigma 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: 80.2°
Max altitude: 48.4°
Azimuth: 279.8°

Distance of σ Pegasi from the Sun and relative movement

σ Pegasi is distant 87.52 light years from the Sun and it is moving far from the Sun at the speed of 12 kilometers per second.

26.85 pc
87.52 ly
12 km/s
0.522 arcsec/year
0.044 arcsec/year

Spectral properties of σ Pegasi

σ Pegasi belongs to spectral class F7 and has a luminosity class of IV corresponding to a sub-giant star.

3.02
F7IV
6481K

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

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

σ Pegasi star system properties

σ Pegasi 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 σ Pegasi double sysyem:

5.16
13.56
8.4
248 arcsec

Alternative designations of σ Pegasi

σ Pegasi
(sigma Pegasi)
SAO127810
SAO127810
Wo 9801 A