HR7818

HR7818 is a double sub-giant star in the constellation of Cygnus.

HR7818 visual magnitude is 6.44. Because of its reltive faintness, HR7818 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 HR7818:

Color of HR7818 ⬤

Magnitude of HR7818 6.44

Class Sub-giant

VISIBILITY RIGHT NOW HR7818 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 66°.

Celestial coordinates and finder chart of HR7818

HR7818 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 HR7818 are provided in the following table:

Right Ascension J2000 20h 25m 05s

Declination J2000 +59° 36’ 00”

Galactic Longitude 94.55°

Galactic Latitude 12.38°

Constellation Cygnus

The simplified sky map below shows the position of HR7818 in the sky:

Simplified finder chart for HR7818.

Visibility of HR7818 from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

HR7818 is circumpolar and transits at 08:22 UTC (altitude: 81.9°)

Digitized Sky Survey image of HR7818

The image below is a photograph of HR7818 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 HR7818 is 0.01 arcsec per year in Right Ascension and -0.007 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR7818. The red arrow shows the motion of HR7818 during the next 10000 years (1.67 arcmin in Right Ascension and -1.17 arcmin in declination);

Distance of HR7818 from the Sun and relative movement

HR7818 is distant 947.67 light years from the Sun and it is moving towards the Sun at the speed of 22 kilometers per second.

Distance (parsec) 290.70 pc

Distance (light year) 947.67 ly

Heliocentric radial velocity -22 km/s

Proper Motion RA 0.01 arcsec/year

Proper Motion Dec -0.007 arcsec/year

Spectral properties of HR7818

HR7818 belongs to spectral class A2 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude -0.88

Spectral Type A2IV

Color Index (B-V) 0.09

Temperature of HR7818 9125K

The red dot in the diagram below shows where HR7818 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7818. Attribution: Richard Powell / CC BY-SA

HR7818 star system properties

HR7818 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 HR7818 double sysyem:

Main star magnitude 6.44

Secondary star magnitude 6.74

Magnitude difference 0.3

Separation 0.2 arcsec

Alternative designations of HR7818

Henry Draper Catalogue HD194882

SAO Catalogue SAO32562

Hipparcos Catalogue HIP100714

Durchmusterung Catalogue BD+59 2228

Aitken Double Star Catalogue ADS13850

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Other stars in Cygnus