Your guide to the Solar System and the night sky
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🌎  Greenwich, United Kingdom [change]

HR7802

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:

6.2
Hypergiant
HR7802 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 10°.

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:

20h 22m 55s
+42° 58’ 59”
80.46°
3.32°
Cygnus

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

Finder chart HR7802 star
Simplified finder chart for HR7802.

Visibility of HR7802 from your location

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

HR7802 is circumpolar and transits at 19:48 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.

Image of HR7802 star
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.

101.42 pc
330.63 ly
-20 km/s
0.053 arcsec/year
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.

1.17
K0III
4866K

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

HR 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:

6.2
8
1.8
93.2 arcsec

Alternative designations of HR7802

SAO49550
SAO49550