HR7805

Altitude: 69.6° Azimuth: 319.6° Direction: North-West

HR7805 is a double giant star in the constellation of Draco.

HR7805 visual magnitude is 5.69. Because of its reltive faintness, HR7805 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 HR7805:

Color of HR7805 ⬤

Magnitude of HR7805 5.69

Class Giant

VISIBILITY RIGHT NOW

HR7805 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 69.6°
Azimuth: 319.6°
Direction: North-West

Celestial coordinates and finder chart of HR7805

HR7805 is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR7805 are provided in the following table:

Right Ascension J2000 20h 21m 11s

Declination J2000 +63° 58’ 49”

Galactic Longitude 98.1°

Galactic Latitude 15.11°

Constellation Draco

The simplified sky map below shows the position of HR7805 in the sky:

Simplified finder chart for HR7805.

Visibility of HR7805 from your location

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

HR7805 is circumpolar and transits at 15:48 UTC (altitude: 77.5°)

Digitized Sky Survey image of HR7805

The image below is a photograph of HR7805 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 HR7805 is -0.004 arcsec per year in Right Ascension and 0.023 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR7805. The red arrow shows the motion of HR7805 during the next 10000 years (-0.67 arcmin in Right Ascension and 3.83 arcmin in declination);

Distance of HR7805 from the Sun and relative movement

HR7805 is distant 732.58 light years from the Sun and it is moving far from the Sun at the speed of 30 kilometers per second.

Distance (parsec) 224.72 pc

Distance (light year) 732.58 ly

Heliocentric radial velocity 30 km/s

Proper Motion RA -0.004 arcsec/year

Proper Motion Dec 0.023 arcsec/year

Spectral properties of HR7805

HR7805 belongs to spectral class K5 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -1.07

Spectral Type K5III

Color Index (B-V) 1.56

Temperature of HR7805 3705K

The red dot in the diagram below shows where HR7805 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7805. Attribution: Richard Powell / CC BY-SA

HR7805 star system properties

HR7805 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 HR7805 double sysyem:

Main star magnitude 5.69

Secondary star magnitude 12.59

Magnitude difference 6.9

Separation 4.3 arcsec

Alternative designations of HR7805

Henry Draper Catalogue HD194298

SAO Catalogue SAO18826

Hipparcos Catalogue HIP100357

Durchmusterung Catalogue BD+63 1618

Aitken Double Star Catalogue ADS13769

Support us

In Evidence

Other stars in Draco