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🌎  Greenwich, United Kingdom [change]


HR4797 is a variable hypergiant star in the constellation of Corvus.

HR4797 visual magnitude is 6.2. Because of its reltive faintness, HR4797 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 HR4797:

HR4797 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 8°.

Celestial coordinates and finder chart of HR4797

HR4797 is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR4797 are provided in the following table:

12h 35m 58s
-20° 31’ 37”

The simplified sky map below shows the position of HR4797 in the sky:

Finder chart HR4797 star
Simplified finder chart for HR4797.

Visibility of HR4797 from your location

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

Today's HR4797 rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 110.5°
Max altitude: 18.0°
Azimuth: 249.5°
HR4797 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR4797

The image below is a photograph of HR4797 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 HR4797 is 0.014 arcsec per year in Right Ascension and -0.037 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4797 star
DSS2 image of HR4797. The red arrow shows the motion of HR4797 during the next 10000 years (2.33 arcmin in Right Ascension and -6.17 arcmin in declination);

Distance of HR4797 from the Sun and relative movement

HR4797 is distant 251.16 light years from the Sun and it is moving towards the Sun at the speed of 2 kilometers per second.

77.04 pc
251.16 ly
-2 km/s
0.014 arcsec/year
-0.037 arcsec/year

Spectral properties of HR4797

HR4797 belongs to spectral class F0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where HR4797 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR4797. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4797