Your guide to the Solar System and the night sky
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🌎  Observing from: Greenwich, United Kingdom [change]
🌅 Sunrise: 6:38  ☀️ Transit: 13:03  🌅 Sunset: 19:28

θ Andromedae (theta Andromedae)

θ Andromedae is a variable main-sequence star in the constellation of Andromeda.

θ Andromedae visual magnitude is 4.61. Because of its moderate brightness, θ Andromedae should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about θ Andromedae:

θ Andromedae (theta Andromedae) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 20°.

Celestial coordinates and finder chart of θ Andromedae

θ Andromedae 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 θ Andromedae are provided in the following table:

00h 17m 05s
+38° 40’ 54”

The simplified sky map below shows the position of θ Andromedae in the sky:

Finder chart θ Andromedae (theta Andromedae) star
Simplified finder chart for θ Andromedae (theta Andromedae).

Visibility of θ Andromedae from your location

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

θ Andromedae (theta Andromedae) is circumpolar and transits at 11:42 UTC (altitude: 77.2°)

Digitized Sky Survey image of θ Andromedae

The image below is a photograph of θ Andromedae 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 θ Andromedae is -0.05 arcsec per year in Right Ascension and -0.019 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of θ Andromedae (theta Andromedae) star
DSS2 image of θ Andromedae. The red arrow shows the motion of θ Andromedae during the next 10000 years (-8.33 arcmin in Right Ascension and -3.17 arcmin in declination);

Distance of θ Andromedae from the Sun and relative movement

θ Andromedae is distant 253.11 light years from the Sun and it is moving far from the Sun at the speed of 1 kilometers per second.

77.64 pc
253.11 ly
1 km/s
-0.05 arcsec/year
-0.019 arcsec/year

Spectral properties of θ Andromedae

θ Andromedae belongs to spectral class A2 and has a luminosity class of V corresponding to a main-sequence star.


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

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

Alternative designations of θ Andromedae

θ Andromedae
(theta Andromedae)
24 Andromedae