Your guide to the Solar System and the night sky
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🌎  Observing from: Greenwich, United Kingdom [change]

HR8990

HR8990 is a double giant star in the constellation of Cassiopeia.

HR8990 visual magnitude is 6.4. Because of its reltive faintness, HR8990 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 HR8990:

6.4
Giant
HR8990 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 23°.

Celestial coordinates and finder chart of HR8990

HR8990 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 HR8990 are provided in the following table:

23h 42m 31s
+61° 40’ 45”
114.85°
-0.11°
Cassiopeia

The simplified sky map below shows the position of HR8990 in the sky:

Finder chart HR8990 star
Simplified finder chart for HR8990.

Visibility of HR8990 from your location

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

HR8990 is circumpolar and transits at 14:32 UTC (altitude: 79.8°)

Digitized Sky Survey image of HR8990

The image below is a photograph of HR8990 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 HR8990 is 0.043 arcsec per year in Right Ascension and -0.021 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR8990 star
DSS2 image of HR8990. The red arrow shows the motion of HR8990 during the next 10000 years (7.17 arcmin in Right Ascension and -3.50 arcmin in declination);

Distance of HR8990 from the Sun and relative movement

HR8990 is distant 459.15 light years from the Sun and it is moving towards the Sun at the speed of 16 kilometers per second.

140.85 pc
459.15 ly
-16 km/s
0.043 arcsec/year
-0.021 arcsec/year

Spectral properties of HR8990

HR8990 belongs to spectral class K2 and has a luminosity class of III corresponding to a giant star.

0.66
K2III
4232K

The red dot in the diagram below shows where HR8990 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR8990. Attribution: Richard Powell / CC BY-SA

HR8990 star system properties

HR8990 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 HR8990 double sysyem:

6.4
12.9
6.5
8 arcsec

Alternative designations of HR8990

SAO20793
SAO20793