σ Pegasi (sigma Pegasi)

Altitude: 26.8° Azimuth: 250.9° Direction: West-South-West

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

The table below summarizes the key facts about σ Pegasi:

Color of σ Pegasi ⬤

Magnitude of σ Pegasi 5.16

Class Sub-giant

VISIBILITY RIGHT NOW

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

Altitude: 26.8°
Azimuth: 250.9°
Direction: West-South-West

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:

Right Ascension J2000 22h 52m 24s

Declination J2000 +09° 50’ 08”

Galactic Longitude 80.87°

Galactic Latitude -43.1°

Constellation 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° RISE 0:10

Max altitude: 48.4° TRANSIT 7:02

Azimuth: 279.8° SET 13:50

RIGHT NOW σ Pegasi (sigma Pegasi) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of σ Pegasi

The image below is a photograph of σ 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 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.

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);

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.

Distance (parsec) 26.85 pc

Distance (light year) 87.52 ly

Heliocentric radial velocity 12 km/s

Proper Motion RA 0.522 arcsec/year

Proper Motion Dec 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.

Absolute magnitude 3.02

Spectral Type F7IV

Color Index (B-V) 0.48

Temperature of σ Pegasi 6481K

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

Main star magnitude 5.16

Secondary star magnitude 13.56

Magnitude difference 8.4

Separation 248 arcsec

Alternative designations of σ Pegasi

Bayer designation σ Pegasi
(sigma Pegasi)

Flamsteed designation 49 Pegasi

Henry Draper Catalogue HD216385

SAO Catalogue SAO127810

Hipparcos Catalogue HIP112935

Durchmusterung Catalogue BD+09 5122

Gliese Catalogue Wo 9801 A

FK5 Catalogue 3828

In Evidence

Other stars in Pegasus