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: 4:43  
clear_day Transit: 12:58  
SunsetSet: 21:12 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Cassiopeia » 


Altitude: 36.3°   Azimuth: 39.7°   Direction: North-East

HR391 is a multiple main-sequence star in the constellation of Cassiopeia.

HR391 visual magnitude is 6.45. Because of its reltive faintness, HR391 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 HR391:


HR391 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 36.3°
Azimuth: 39.7°
Direction: North-East

Celestial coordinates and finder chart of HR391

HR391 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR391 are provided in the following table:

01h 23m 21s
+58° 08’ 35”

The simplified sky map below shows the position of HR391 in the sky:

Finder chart HR391 star
Simplified finder chart for HR391.

Visibility of HR391 from your location

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

HR391 is circumpolar and transits at 08:09 UTC (altitude: 83.3°)

Digitized Sky Survey image of HR391

The image below is a photograph of HR391 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 HR391 is 0.139 arcsec per year in Right Ascension and -0.094 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR391 star
DSS2 image of HR391. The red arrow shows the motion of HR391 during the next 1000 years (2.32 arcmin in Right Ascension and -1.57 arcmin in declination);

Distance of HR391 from the Sun and relative movement

HR391 is distant 188.00 light years from the Sun and it is moving far from the Sun at the speed of 7 kilometers per second.

57.67 pc
188.00 ly
7 km/s
0.139 arcsec/year
-0.094 arcsec/year

Spectral properties of HR391

HR391 belongs to spectral class F4 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR391 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR391. Attribution: Richard Powell / CC BY-SA

HR391 star system properties

HR391 is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the HR391 double sysyem:

0.5 arcsec

Alternative designations of HR391