HR7721

HR7721 is a main-sequence star in the constellation of Cygnus.

HR7721 visual magnitude is 6.92. Because of its reltive faintness, HR7721 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 HR7721:

Color of HR7721 ⬤

Magnitude of HR7721 6.92

Class Main-sequence

VISIBILITY RIGHT NOW HR7721 is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 85°.

Celestial coordinates and finder chart of HR7721

HR7721 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 HR7721 are provided in the following table:

Right Ascension J2000 20h 12m 03s

Declination J2000 +47° 44’ 12”

Galactic Longitude 83.37°

Galactic Latitude 7.54°

Constellation Cygnus

The simplified sky map below shows the position of HR7721 in the sky:

Simplified finder chart for HR7721.

Visibility of HR7721 from your location

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

HR7721 is circumpolar and transits at 03:34 UTC (altitude: 86.3°)

Digitized Sky Survey image of HR7721

The image below is a photograph of HR7721 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 HR7721 is 0.016 arcsec per year in Right Ascension and 0.004 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR7721. The red arrow shows the motion of HR7721 during the next 10000 years (2.67 arcmin in Right Ascension and 0.67 arcmin in declination);

Distance of HR7721 from the Sun and relative movement

HR7721 is distant 831.63 light years from the Sun and it is moving towards the Sun at the speed of 19 kilometers per second.

Distance (parsec) 255.10 pc

Distance (light year) 831.63 ly

Heliocentric radial velocity -19 km/s

Proper Motion RA 0.016 arcsec/year

Proper Motion Dec 0.004 arcsec/year

Spectral properties of HR7721

HR7721 belongs to spectral class B7 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -0.11

Spectral Type B7V

Color Index (B-V) -0.12

Temperature of HR7721 11920K

The red dot in the diagram below shows where HR7721 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7721. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7721

Henry Draper Catalogue HD192276

SAO Catalogue SAO49314

Hipparcos Catalogue HIP99539

Durchmusterung Catalogue BD+47 3045

In Evidence

Other stars in Cygnus