Your guide to the Solar System and the night sky
By donating now you help keep this site alive and free from ads. Please consider supporting this project.
🌎  Observing from: Greenwich, United Kingdom [change]

HR398

HR398 is a hypergiant star in the constellation of Cassiopeia.

HR398 visual magnitude is 6.49. Because of its reltive faintness, HR398 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 HR398:

6.49
Hypergiant
HR398 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 37°.

Celestial coordinates and finder chart of HR398

HR398 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 HR398 are provided in the following table:

01h 25m 46s
+70° 58’ 48”
125.75°
8.3°
Cassiopeia

The simplified sky map below shows the position of HR398 in the sky:

Finder chart HR398 star
Simplified finder chart for HR398.

Visibility of HR398 from your location

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

HR398 is circumpolar and transits at 16:15 UTC (altitude: 70.5°)

Digitized Sky Survey image of HR398

The image below is a photograph of HR398 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 HR398 is 0.016 arcsec per year in Right Ascension and -0.013 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR398 star
DSS2 image of HR398. The red arrow shows the motion of HR398 during the next 10000 years (2.67 arcmin in Right Ascension and -2.17 arcmin in declination);

Distance of HR398 from the Sun and relative movement

HR398 is distant 514.20 light years from the Sun and it is moving far from the Sun at the speed of 11 kilometers per second.

157.73 pc
514.20 ly
11 km/s
0.016 arcsec/year
-0.013 arcsec/year

Spectral properties of HR398

HR398 belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.

0.50
A0V
10125K

The red dot in the diagram below shows where HR398 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR398. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR398

SAO4401
SAO4401