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: 6:43  
clear_day Transit: 12:51  
SunsetSet: 18:59 south
sunny DaytimeWhat's Visible Now
All Constellations » Cassiopeia » 


Altitude: 30.9°   Azimuth: 15.9°   Direction: North-North-East

HR273 is a hypergiant star in the constellation of Cassiopeia.

HR273 visual magnitude is 5.97. Because of its reltive faintness, HR273 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 HR273:


HR273 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 30.9°
Azimuth: 15.9°
Direction: North-North-East

Celestial coordinates and finder chart of HR273

HR273 is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR273 are provided in the following table:

00h 58m 31s
+66° 21’ 07”

The simplified sky map below shows the position of HR273 in the sky:

Finder chart HR273 star
Simplified finder chart for HR273.

Visibility of HR273 from your location

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

HR273 is circumpolar and transits at 00:59 UTC (altitude: 75.1°)

Digitized Sky Survey image of HR273

The image below is a photograph of HR273 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 HR273 is 0.043 arcsec per year in Right Ascension and -0.006 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR273 star
DSS2 image of HR273. The red arrow shows the motion of HR273 during the next 10000 years (7.17 arcmin in Right Ascension and -1.00 arcmin in declination);

Distance of HR273 from the Sun and relative movement

HR273 is distant 376.01 light years from the Sun and it is moving towards the Sun at the speed of 10 kilometers per second.

115.34 pc
376.01 ly
-10 km/s
0.043 arcsec/year
-0.006 arcsec/year

Spectral properties of HR273

HR273 belongs to spectral class A0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where HR273 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR273. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR273