HR7804

HR7804 is a variable giant star in the constellation of Draco.

HR7804 visual magnitude is 5.55. Because of its reltive faintness, HR7804 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 HR7804:

Color of HR7804 ⬤

Magnitude of HR7804 5.55

Class Giant

VISIBILITY RIGHT NOW HR7804 is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 53°.

Celestial coordinates and finder chart of HR7804

HR7804 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 HR7804 are provided in the following table:

Right Ascension J2000 20h 20m 06s

Declination J2000 +68° 52’ 49”

Galactic Longitude 102.43°

Galactic Latitude 17.72°

Constellation Draco

The simplified sky map below shows the position of HR7804 in the sky:

Simplified finder chart for HR7804.

Visibility of HR7804 from your location

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

HR7804 is circumpolar and transits at 03:50 UTC (altitude: 72.6°)

Digitized Sky Survey image of HR7804

The image below is a photograph of HR7804 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 HR7804 is 0.017 arcsec per year in Right Ascension and 0.025 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR7804. The red arrow shows the motion of HR7804 during the next 10000 years (2.83 arcmin in Right Ascension and 4.17 arcmin in declination);

Distance of HR7804 from the Sun and relative movement

HR7804 is distant 680.58 light years from the Sun and it is moving towards the Sun at the speed of 43 kilometers per second.

Distance (parsec) 208.77 pc

Distance (light year) 680.58 ly

Heliocentric radial velocity -43 km/s

Proper Motion RA 0.017 arcsec/year

Proper Motion Dec 0.025 arcsec/year

Spectral properties of HR7804

HR7804 belongs to spectral class M4 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -1.05

Spectral Type M4III

Color Index (B-V) 1.59

Temperature of HR7804 3663K

The red dot in the diagram below shows where HR7804 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7804. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7804

Henry Draper Catalogue HD194258

SAO Catalogue SAO18817

Hipparcos Catalogue HIP100261

Durchmusterung Catalogue BD+68 1121

FK5 Catalogue 3631

General Catalogue of Variable Stars AC Dra

In Evidence

Other stars in Draco