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public  Greenwich, UK Greenwich, UK  ⓘ
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All Constellations » Andromeda » 

Alpheratz - α Andromedae (alpha Andromedae)

Below the horizon.  Rise: 5:50 | Tran: 14:45 | Set: 23:41
Alt: -9.15°   Az: 4.82°   Direction: North

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.

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);

Celestial Coordinates

Apparent

00h 09m 41s
+29° 13’ 48”
12h 21m 48s
12h 31m 29s

J2000

00h 08m 23s
+29° 05’ 26”

Galactic Coordinates

111.73°
-32.84°

Finder Chart

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Finder chart for Alpheratz - α Andromedae (alpha Andromedae).

Magnitude, Color, Spectral Class

2.06
Sub-giant
Alpheratz is also a MnHg chemically peculiar star.

-0.31
B8IV
11744K

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

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:

2.06
10.56
8.5
81.5 arcsec

Distance, Radial Speed, Proper Motion

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
97.02
-12 km/s
0.136 arcsec/y
-0.163"/y

Alternative Designations

Alpheratz
α Andromedae
(alpha Andromedae)
21 Andromedae
SAO73765
SAO73765

Visibility from Your Location

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

Azimuth: 60.8°
Max altitude: 67.8°
Azimuth: 299.2°