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🌎  Greenwich, United Kingdom [change]


HR4820 is a variable supergiant star in the constellation of Musca.

HR4820 visual magnitude is 6.33. Because of its reltive faintness, HR4820 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 HR4820:

HR4820 is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of HR4820

HR4820 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 HR4820 are provided in the following table:

12h 42m 05s
-69° 24’ 26”

The simplified sky map below shows the position of HR4820 in the sky:

Finder chart HR4820 star
Simplified finder chart for HR4820.

Visibility of HR4820 from your location

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

HR4820 is currently not visible from Greenwich, United Kingdom [change]

Digitized Sky Survey image of HR4820

The image below is a photograph of HR4820 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 HR4820 is -0.004 arcsec per year in Right Ascension and -0.002 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of HR4820 star
DSS2 image of HR4820. The red arrow shows the motion of HR4820 during the next 100000 years (-6.67 arcmin in Right Ascension and -3.33 arcmin in declination);

Distance of HR4820 from the Sun and relative movement

HR4820 is distant 1,928.99 light years from the Sun and it is moving far from the Sun at the speed of 4 kilometers per second.

591.72 pc
1,928.99 ly
4 km/s
-0.004 arcsec/year
-0.002 arcsec/year

Spectral properties of HR4820

HR4820 belongs to spectral class F7 and has a luminosity class of I corresponding to a supergiant star.


The red dot in the diagram below shows where HR4820 is situated in the HertzsprungÔÇôRussell diagram.

HR Diagram
H-R diagram showing the position of HR4820. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4820