HR7972

HR7972 is a double sub-giant star in the constellation of Cygnus.

HR7972 visual magnitude is 6.27. Because of its reltive faintness, HR7972 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 HR7972:

Color of HR7972 ⬤

Magnitude of HR7972 6.27

Class Sub-giant

VISIBILITY RIGHT NOW HR7972 is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 47°.

Celestial coordinates and finder chart of HR7972

HR7972 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 HR7972 are provided in the following table:

Right Ascension J2000 20h 47m 52s

Declination J2000 +52° 24’ 25”

Galactic Longitude 90.55°

Galactic Latitude 5.58°

Constellation Cygnus

The simplified sky map below shows the position of HR7972 in the sky:

Simplified finder chart for HR7972.

Visibility of HR7972 from your location

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

HR7972 is circumpolar and transits at 04:18 UTC (altitude: 89.1°)

Digitized Sky Survey image of HR7972

The image below is a photograph of HR7972 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 HR7972 is 0.068 arcsec per year in Right Ascension and -0.158 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of HR7972. The red arrow shows the motion of HR7972 during the next 1000 years (1.13 arcmin in Right Ascension and -2.63 arcmin in declination);

Distance of HR7972 from the Sun and relative movement

HR7972 is distant 136.52 light years from the Sun and it is moving towards the Sun at the speed of 41 kilometers per second.

Distance (parsec) 41.88 pc

Distance (light year) 136.52 ly

Heliocentric radial velocity -41 km/s

Proper Motion RA 0.068 arcsec/year

Proper Motion Dec -0.158 arcsec/year

Spectral properties of HR7972

HR7972 belongs to spectral class G7 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude 3.16

Spectral Type G7IV

Color Index (B-V) 0.89

Temperature of HR7972 5023K

The red dot in the diagram below shows where HR7972 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7972. Attribution: Richard Powell / CC BY-SA

HR7972 star system properties

HR7972 is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the HR7972 double sysyem:

Main star magnitude 6.27

Secondary star magnitude 11.47

Magnitude difference 5.2

Separation 12.2 arcsec

Alternative designations of HR7972

Henry Draper Catalogue HD198387

SAO Catalogue SAO32897

Hipparcos Catalogue HIP102642

Durchmusterung Catalogue BD+51 2954

Aitken Double Star Catalogue ADS14322

In Evidence

Other stars in Cygnus