4 Pegasi

Below the horizon. Rise: 22:01 | Tran: 4:33 | Set: 11:01

Alt: -31.57° Az: 344.87° Direction: South-West

4 Pegasi is a double sub-giant star of spectral class A9 in the constellation of Pegasus.

4 Pegasi visual magnitude is 5.67. Because of its faintness, 4 Pegasi is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

DSS2 image of 4 Pegasi. The red arrow shows the motion of 4 Pegasi during the next 1000 years (1.90 arcmin in Right Ascension and 0.40 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 21h 39m 48s

Declination +05° 53’ 15”

Hour Angle 11h 08m 19s

Sidereal Time 08h 48m 07s

J2000

Right Ascension 21h 38m 31s

Declination +05° 46’ 18”

Galactic Coordinates

Galactic Longitude 60.76°

Galactic Latitude -32.96°

Finder Chart

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Finder chart for 4 Pegasi.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.67

Class Sub-giant

Absolute magnitude 2.03

Spectral Type A9IV

Color Index (B-V) 0.25

Temperature 7795K

The red dot in the diagram below shows where 4 Pegasi is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 4 Pegasi. Attribution: Richard Powell / CC BY-SA

Star System Properties

4 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 4 Pegasi double sysyem:

Main star magnitude 5.67

Secondary star magnitude 12.07

Magnitude difference 6.4

Separation 27.2 arcsec

Distance, Radial Speed, Proper Motion

4 Pegasi is distant 173.96 light years from the Sun and it is moving towards the Sun at the speed of 19 kilometers per second.

Distance (parsec) 53.36

Distance (light year) 173.96

Radial Speed -19 km/s

Proper Motion RA 0.114 arcsec/y

Proper Motion Dec 0.024"/y

Alternative Designations

Flamsteed designation 4 Pegasi

Henry Draper Catalogue HD205924

SAO Catalogue SAO126956

Hipparcos Catalogue HIP106856

Durchmusterung Catalogue BD+05 4834

Aitken Double Star Catalogue ADS15157

Visibility from Your Location

Today's 4 Pegasi rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 84.1° RISE 22:01

Max altitude: 44.4° TRANSIT 4:33

Azimuth: 275.9° SET 11:01

Set Location

Other stars in Pegasus