HR7591

HR7591 is a variable giant star in the constellation of Cygnus.

HR7591 visual magnitude is 5.91. Because of its reltive faintness, HR7591 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 HR7591:

Color of HR7591 ⬤

Magnitude of HR7591 5.91

Class Giant

VISIBILITY RIGHT NOW HR7591 is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 9°.

Celestial coordinates and finder chart of HR7591

HR7591 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 HR7591 are provided in the following table:

Right Ascension J2000 19h 52m 07s

Declination J2000 +47° 55’ 54”

Galactic Longitude 81.81°

Galactic Latitude 10.51°

Constellation Cygnus

The simplified sky map below shows the position of HR7591 in the sky:

Simplified finder chart for HR7591.

Visibility of HR7591 from your location

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

HR7591 is circumpolar and transits at 03:06 UTC (altitude: 86.5°)

Digitized Sky Survey image of HR7591

The image below is a photograph of HR7591 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 HR7591 is -0.005 arcsec per year in Right Ascension and -0.007 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

DSS2 image of HR7591. The red arrow shows the motion of HR7591 during the next 100000 years (-8.33 arcmin in Right Ascension and -11.67 arcmin in declination);

Distance of HR7591 from the Sun and relative movement

HR7591 is distant 2,469.70 light years from the Sun and it is moving towards the Sun at the speed of 18 kilometers per second.

Distance (parsec) 757.58 pc

Distance (light year) 2,469.70 ly

Heliocentric radial velocity -18 km/s

Proper Motion RA -0.005 arcsec/year

Proper Motion Dec -0.007 arcsec/year

Spectral properties of HR7591

HR7591 belongs to spectral class B2 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -3.49

Spectral Type B2III

Color Index (B-V) -0.18

Temperature of HR7591 13121K

The red dot in the diagram below shows where HR7591 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7591. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7591

Henry Draper Catalogue HD188252

SAO Catalogue SAO48920

Hipparcos Catalogue HIP97774

Durchmusterung Catalogue BD+47 2939

General Catalogue of Variable Stars 12511

In Evidence

Other stars in Cygnus