9 Persei

Above the horizon. Circumpolar today

Alt: 64.74° Az: 297.10° Direction: West-North-West

9 Persei is a variable and double supergiant star of spectral class A2 in the constellation of Perseus.

9 Persei visual magnitude is 5.17. Because of its faintness, 9 Persei 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 9 Persei. The red arrow shows the motion of 9 Persei during the next 100000 years (-3.33 arcmin in Right Ascension and -3.33 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 02h 24m 08s

Declination +55° 57’ 36”

Hour Angle 02h 50m 56s

Sidereal Time 05h 15m 05s

J2000

Right Ascension 02h 22m 21s

Declination +55° 50’ 44”

Galactic Coordinates

Galactic Longitude 135.51°

Galactic Latitude -4.79°

Finder Chart

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Finder chart for 9 Persei.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.17

Class Supergiant

Absolute magnitude -3.82

Spectral Type A2I

Color Index (B-V) 0.37

Temperature 7044K

The red dot in the diagram below shows where 9 Persei is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 9 Persei. Attribution: Richard Powell / CC BY-SA

Star System Properties

9 Persei 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 9 Persei double sysyem:

Main star magnitude 5.17

Secondary star magnitude 12.97

Magnitude difference 7.8

Separation 11.6 arcsec

Distance, Radial Speed, Proper Motion

9 Persei is distant 2,050.31 light years from the Sun and it is moving towards the Sun at the speed of 15 kilometers per second.

Distance (parsec) 628.93

Distance (light year) 2,050.31

Radial Speed -15 km/s

Proper Motion RA -0.002 arcsec/y

Proper Motion Dec -0.002"/y

Alternative Designations

Flamsteed designation 9 Persei

Henry Draper Catalogue HD14489

SAO Catalogue SAO23256

Hipparcos Catalogue HIP11060

Durchmusterung Catalogue BD+55 598

FK5 Catalogue 2159

General Catalogue of Variable Stars V474 Per

Aitken Double Star Catalogue ADS1802

Visibility from Your Location

9 Persei is circumpolar and transits at 10:58 UTC (altitude: 85.5°)

Set Location

Other stars in Perseus