HR7802

Altitude: 46.8° Azimuth: 285.1° Direction: West-North-West

HR7802 is a variable and multiple hypergiant star in the constellation of Cygnus.

HR7802 visual magnitude is 6.2. Because of its reltive faintness, HR7802 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 HR7802:

Color of HR7802 ⬤

Magnitude of HR7802 6.2

Class Hypergiant

VISIBILITY RIGHT NOW

HR7802 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 46.8°
Azimuth: 285.1°
Direction: West-North-West

Celestial coordinates and finder chart of HR7802

HR7802 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 HR7802 are provided in the following table:

Right Ascension J2000 20h 22m 55s

Declination J2000 +42° 58’ 59”

Galactic Longitude 80.46°

Galactic Latitude 3.32°

Constellation Cygnus

The simplified sky map below shows the position of HR7802 in the sky:

Simplified finder chart for HR7802.

Visibility of HR7802 from your location

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

HR7802 is circumpolar and transits at 15:34 UTC (altitude: 81.5°)

Digitized Sky Survey image of HR7802

The image below is a photograph of HR7802 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 HR7802 is 0.053 arcsec per year in Right Ascension and 0.036 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR7802. The red arrow shows the motion of HR7802 during the next 10000 years (8.83 arcmin in Right Ascension and 6.00 arcmin in declination);

Distance of HR7802 from the Sun and relative movement

HR7802 is distant 330.63 light years from the Sun and it is moving towards the Sun at the speed of 20 kilometers per second.

Distance (parsec) 101.42 pc

Distance (light year) 330.63 ly

Heliocentric radial velocity -20 km/s

Proper Motion RA 0.053 arcsec/year

Proper Motion Dec 0.036 arcsec/year

Spectral properties of HR7802

HR7802 belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.

Absolute magnitude 1.17

Spectral Type K0III

Color Index (B-V) 0.95

Temperature of HR7802 4866K

The red dot in the diagram below shows where HR7802 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7802. Attribution: Richard Powell / CC BY-SA

HR7802 star system properties

HR7802 is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the HR7802 double sysyem:

Main star magnitude 6.2

Secondary star magnitude 8

Magnitude difference 1.8

Separation 93.2 arcsec

Alternative designations of HR7802

Henry Draper Catalogue HD194220

SAO Catalogue SAO49550

Hipparcos Catalogue HIP100515

Durchmusterung Catalogue BD+42 3721

General Catalogue of Variable Stars 13053

Aitken Double Star Catalogue ADS13786

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