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

HR129

HR129 is a hypergiant star in the constellation of Cassiopeia.

HR129 visual magnitude is 6.42. Because of its reltive faintness, HR129 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 HR129:

6.42
Hypergiant
HR129 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 35°.

Celestial coordinates and finder chart of HR129

HR129 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 HR129 are provided in the following table:

00h 33m 19s
+70° 58’ 54”
121.44°
8.16°
Cassiopeia

The simplified sky map below shows the position of HR129 in the sky:

Finder chart HR129 star
Simplified finder chart for HR129.

Visibility of HR129 from your location

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

HR129 is circumpolar and transits at 15:23 UTC (altitude: 70.5°)

Digitized Sky Survey image of HR129

The image below is a photograph of HR129 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 HR129 is 0.028 arcsec per year in Right Ascension and -0.004 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR129 star
DSS2 image of HR129. The red arrow shows the motion of HR129 during the next 10000 years (4.67 arcmin in Right Ascension and -0.67 arcmin in declination);

Distance of HR129 from the Sun and relative movement

HR129 is distant 527.51 light years from the Sun and it is moving towards the Sun at the speed of 10 kilometers per second.

161.81 pc
527.51 ly
-10 km/s
0.028 arcsec/year
-0.004 arcsec/year

Spectral properties of HR129

HR129 belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.

0.37
A0V
10252K

The red dot in the diagram below shows where HR129 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR129. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR129

SAO4142
SAO4142