HR233

Altitude: 50.6° Azimuth: 318.5° Direction: North-West

HR233 is a variable hypergiant star in the constellation of Cassiopeia.

HR233 visual magnitude is 5.39. Because of its reltive faintness, HR233 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 HR233:

Color of HR233 ⬤

Magnitude of HR233 5.39

Class Hypergiant

VISIBILITY RIGHT NOW

HR233 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 50.6°
Azimuth: 318.5°
Direction: North-West

Celestial coordinates and finder chart of HR233

HR233 is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR233 are provided in the following table:

Right Ascension J2000 00h 50m 43s

Declination J2000 +64° 14’ 51”

Galactic Longitude 122.85°

Galactic Latitude 1.38°

Constellation Cassiopeia

The simplified sky map below shows the position of HR233 in the sky:

Simplified finder chart for HR233.

Visibility of HR233 from your location

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

HR233 is circumpolar and transits at 07:44 UTC (altitude: 77.2°)

Digitized Sky Survey image of HR233

The image below is a photograph of HR233 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 HR233 is 0.03 arcsec per year in Right Ascension and -0.012 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR233. The red arrow shows the motion of HR233 during the next 10000 years (5.00 arcmin in Right Ascension and -2.00 arcmin in declination);

Distance of HR233 from the Sun and relative movement

HR233 is distant 812.97 light years from the Sun and it is moving far from the Sun at the speed of 3 kilometers per second.

Distance (parsec) 249.38 pc

Distance (light year) 812.97 ly

Heliocentric radial velocity 3 km/s

Proper Motion RA 0.03 arcsec/year

Proper Motion Dec -0.012 arcsec/year

Spectral properties of HR233

HR233 belongs to spectral class G0 and has a luminosity class of III corresponding to a hypergiant star.

Absolute magnitude -1.59

Spectral Type G0III

Color Index (B-V) 0.49

Temperature of HR233 6435K

The red dot in the diagram below shows where HR233 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR233. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR233

Henry Draper Catalogue HD4775

SAO Catalogue SAO11424

Hipparcos Catalogue HIP3951

Durchmusterung Catalogue BD+63 99

FK5 Catalogue 29

General Catalogue of Variable Stars 317

In Evidence

Other stars in Cassiopeia