HR8399

Above the horizon. Circumpolar today

Alt: 70.21° Az: 43.98° Direction: North-East

HR8399 is a variable and double hypergiant star of spectral class B0 in the constellation of Cepheus.

HR8399 visual magnitude is 6.66. Because of its faintness, HR8399 is not visible to the naked eye.

DSS2 image of HR8399. The red arrow shows the motion of HR8399 during the next 100000 years (-1.67 arcmin in Right Ascension and 11.67 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 22h 01m 24s

Declination +62° 36’ 34”

Hour Angle 21h 57m 05s

Sidereal Time 19h 58m 29s

J2000

Right Ascension 22h 00m 39s

Declination +62° 29’ 17”

Galactic Coordinates

Galactic Longitude 104.58°

Galactic Latitude 5.87°

Finder Chart

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Finder chart for HR8399.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 6.66

Class Hypergiant

Absolute magnitude -7.61

Spectral Type B0IV

Color Index (B-V) 0.06

Temperature 9434K

The red dot in the diagram below shows where HR8399 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR8399. Attribution: Richard Powell / CC BY-SA

Star System Properties

HR8399 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR8399 double sysyem:

Main star magnitude 6.66

Secondary star magnitude 8.66

Magnitude difference 2

Separation 0.9 arcsec

Distance, Radial Speed, Proper Motion

HR8399 is distant 23,285.71 light years from the Sun and it is moving towards the Sun at the speed of 20 kilometers per second.

Distance (parsec) 7,142.86

Distance (light year) 23,285.71

Radial Speed -20 km/s

Proper Motion RA -0.001 arcsec/y

Proper Motion Dec 0.007"/y

Alternative Designations

Henry Draper Catalogue HD209339

SAO Catalogue SAO19792

Hipparcos Catalogue HIP108650

Durchmusterung Catalogue BD+61 2233

General Catalogue of Variable Stars 13998

Visibility from Your Location

HR8399 is circumpolar and transits at 12:06 UTC (altitude: 78.9°)

Set Location

Other stars in Cepheus