Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:54  
clear_day Transit: 12:49  
SunsetSet: 18:43 south
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All Constellations » Microscopium » 


Altitude: -8.8°   Azimuth: 213.1°   Direction: South-South-West

HR8104 is a sub-giant star in the constellation of Microscopium.

HR8104 visual magnitude is 5.26. Because of its reltive faintness, HR8104 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 HR8104:


HR8104 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -8.8°
Azimuth: 213.1°
Direction: South-South-West

Celestial coordinates and finder chart of HR8104

HR8104 is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR8104 are provided in the following table:

21h 13m 03s
-39° 25’ 31”

The simplified sky map below shows the position of HR8104 in the sky:

Finder chart HR8104 star
Simplified finder chart for HR8104.

Visibility of HR8104 from your location

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

HR8104 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR8104

The image below is a photograph of HR8104 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 HR8104 is 0.186 arcsec per year in Right Ascension and -0.123 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR8104 star
DSS2 image of HR8104. The red arrow shows the motion of HR8104 during the next 1000 years (3.10 arcmin in Right Ascension and -2.05 arcmin in declination);

Distance of HR8104 from the Sun and relative movement

HR8104 is distant 108.81 light years from the Sun and it is moving towards the Sun at the speed of 44 kilometers per second.

33.38 pc
108.81 ly
-44 km/s
0.186 arcsec/year
-0.123 arcsec/year

Spectral properties of HR8104

HR8104 belongs to spectral class F5 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where HR8104 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR8104. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR8104