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🌎  Greenwich, United Kingdom [change]


HR4817 is a variable bright giant star in the constellation of Centaurus.

HR4817 visual magnitude is 4.64. Because of its moderate brightness, HR4817 should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about HR4817:

Bright giant
HR4817 is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of HR4817

HR4817 is situated south of the celestial equator, as such, it is more easily visible from the southern emisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR4817 are provided in the following table:

12h 39m 52s
-39° 59’ 14”

The simplified sky map below shows the position of HR4817 in the sky:

Finder chart HR4817 star
Simplified finder chart for HR4817.

Visibility of HR4817 from your location

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

HR4817 is currently not visible from Greenwich, United Kingdom [change]

Digitized Sky Survey image of HR4817

The image below is a photograph of HR4817 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 HR4817 is -0.047 arcsec per year in Right Ascension and -0.03 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4817 star
DSS2 image of HR4817. The red arrow shows the motion of HR4817 during the next 10000 years (-7.83 arcmin in Right Ascension and -5.00 arcmin in declination);

Distance of HR4817 from the Sun and relative movement

HR4817 is distant 354.73 light years from the Sun and it is moving far from the Sun at the speed of 15 kilometers per second.

108.81 pc
354.73 ly
15 km/s
-0.047 arcsec/year
-0.03 arcsec/year

Spectral properties of HR4817

HR4817 belongs to spectral class B8 and has a luminosity class of II corresponding to a bright giant star.


The red dot in the diagram below shows where HR4817 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4817. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4817