HR8166

Above the horizon. Rise: 21:18 | Tran: 6:52 | Set: 16:23

Alt: 56.20° Az: 251.15° Direction: West-South-West

HR8166 is a multiple sub-giant star of spectral class G8 in the constellation of Cygnus.

HR8166 visual magnitude is 5.68. Because of its faintness, HR8166 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 HR8166. The red arrow shows the motion of HR8166 during the next 10000 years (8.83 arcmin in Right Ascension and -5.50 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 21h 21m 54s

Declination +32° 33’ 41”

Hour Angle 02h 34m 38s

Sidereal Time 23h 56m 33s

J2000

Right Ascension 21h 20m 50s

Declination +32° 27’ 10”

Galactic Coordinates

Galactic Longitude 79.6°

Galactic Latitude -12.18°

Finder Chart

Loading map...

Finder chart for HR8166.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.68

Class Sub-giant

Absolute magnitude 1.36

Spectral Type G8IV

Color Index (B-V) 1.08

Temperature 4559K

The red dot in the diagram below shows where HR8166 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR8166. Attribution: Richard Powell / CC BY-SA

Star System Properties

HR8166 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR8166 double sysyem:

Main star magnitude 5.68

Secondary star magnitude 6.08

Magnitude difference 0.4

Separation 2.1 arcsec

Distance, Radial Speed, Proper Motion

HR8166 is distant 238.83 light years from the Sun and it is moving towards the Sun at the speed of 29 kilometers per second.

Distance (parsec) 73.26

Distance (light year) 238.83

Radial Speed -29 km/s

Proper Motion RA 0.053 arcsec/y

Proper Motion Dec -0.033"/y

Alternative Designations

Henry Draper Catalogue HD203358

SAO Catalogue SAO71230

Hipparcos Catalogue HIP105390

Durchmusterung Catalogue BD+31 4425

Aitken Double Star Catalogue ADS14889

Visibility from Your Location

Today's HR8166 rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 57.4° RISE 21:18

Max altitude: 71.1° TRANSIT 6:52

Azimuth: 302.6° SET 16:23

Set Location

Other stars in Cygnus