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public LocationGreenwich, United Kingdom
Sunrise: 4:42 
Transit: 12:59 
Sunset: 21:16
sunny   (Daytime)   What's Visible Now?

Alpheratz - α Andromedae (alpha Andromedae)

Below the horizon.  Rise: 22:33 | Tran: 7:32 | Set: 16:26
Altitude: -6.8°   Azimuth: 339.2°   Direction: North-North-West

Alpheratz, also designated as α Andromedae (alpha Andromedae), is a variable and double sub-giant star of spectral class B8 in the constellation of Andromeda.

Alpheratz visual magnitude is 2.06, making it the 53th brightest star in the sky. Because of its brightness, Alpheratz is clearly visible to the naked eye when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

Celestial coordinates and finder chart of Alpheratz

Finder chart Alpheratz - α Andromedae (alpha Andromedae) star
Simplified finder chart for Alpheratz - α Andromedae (alpha Andromedae).

Alpheratz 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 Alpheratz are provided in the following table:

00h 08m 23s
+29° 05’ 26”
Image of Alpheratz - α Andromedae (alpha Andromedae) star
DSS2 image of Alpheratz. The red arrow shows the motion of Alpheratz during the next 1000 years (2.27 arcmin in Right Ascension and -2.72 arcmin in declination);

Key facts about Alpheratz


and has a luminosity class of IV corresponding to a sub-giant star. Alpheratz is also a MnHg chemically peculiar star.


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

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

Alpheratz star system properties

Alpheratz 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 Alpheratz double sysyem:

81.5 arcsec

Distance of Alpheratz from the Sun and relative movement

Alpheratz is distant 97.02 light years from the Sun and it is moving towards the Sun at the speed of 12 kilometers per second.

29.76 pc
97.02 ly
-12 km/s
0.136 arcsec/year
-0.163 arcsec/year

Alternative designations of Alpheratz

α Andromedae
(alpha Andromedae)
21 Andromedae

Visibility of Alpheratz from your location

Today's Alpheratz - α Andromedae (alpha Andromedae) rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):

Azimuth: 60.9°
Max altitude: 67.6°
Azimuth: 299.1°