HR8166

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

HR8166 visual magnitude is 5.68. Because of its reltive faintness, HR8166 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 HR8166:

Color of HR8166 ⬤

Magnitude of HR8166 5.68

Class Sub-giant

VISIBILITY RIGHT NOW HR8166 is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 3°.

Celestial coordinates and finder chart of HR8166

HR8166 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR8166 are provided in the following table:

Right Ascension J2000 21h 20m 50s

Declination J2000 +32° 27’ 10”

Galactic Longitude 79.6°

Galactic Latitude -12.18°

Constellation Cygnus

The simplified sky map below shows the position of HR8166 in the sky:

Simplified finder chart for HR8166.

Visibility of HR8166 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 HR8166 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: 57.5° RISE 20:14

Max altitude: 71.0° TRANSIT 5:47

Azimuth: 302.5° SET 15:16

RIGHT NOW HR8166 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR8166

The image below is a photograph of HR8166 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 HR8166 is 0.053 arcsec per year in Right Ascension and -0.033 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

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);

Distance of HR8166 from the Sun and relative movement

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 pc

Distance (light year) 238.83 ly

Heliocentric radial velocity -29 km/s

Proper Motion RA 0.053 arcsec/year

Proper Motion Dec -0.033 arcsec/year

Spectral properties of HR8166

HR8166 belongs to spectral class G8 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude 1.36

Spectral Type G8IV

Color Index (B-V) 1.08

Temperature of HR8166 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

HR8166 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

Alternative designations of HR8166

Henry Draper Catalogue HD203358

SAO Catalogue SAO71230

Hipparcos Catalogue HIP105390

Durchmusterung Catalogue BD+31 4425

Aitken Double Star Catalogue ADS14889

In Evidence

Other stars in Cygnus