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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:40  
clear_day Transit: 12:10  
SunsetSet: 17:41
wb_twilight Nautical TwilightWhat's Visible Now?
All Constellations » Andromeda » 

η Andromedae (eta Andromedae)

Altitude: -2.7°   Azimuth: 45.7°   Direction: North-East

η Andromedae is a double giant star in the constellation of Andromeda.

η Andromedae visual magnitude is 4.42. Because of its moderate brightness, η Andromedae should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of η Andromedae is -0.044 arcsec per year in Right Ascension and -0.048 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of η Andromedae (eta Andromedae) star
DSS2 image of η Andromedae. The red arrow shows the motion of η Andromedae during the next 10000 years (-7.33 arcmin in Right Ascension and -8.00 arcmin in declination);

Key facts about η Andromedae

4.42
Giant

η Andromedae (eta Andromedae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -2.7°
Azimuth: 45.7°
Direction: North-East

Celestial coordinates and finder chart of η Andromedae

η Andromedae is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of η Andromedae are provided in the following table:

00h 57m 12s
+23° 25’ 03”
124.65°
-39.43°
Andromeda

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

Finder chart η Andromedae (eta Andromedae) star
Simplified finder chart for η Andromedae (eta Andromedae).

Visibility of η Andromedae from your location

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

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

Azimuth: 66.6°
Max altitude: 61.9°
Azimuth: 293.4°

Distance of η Andromedae from the Sun and relative movement

η Andromedae is distant 242.56 light years from the Sun and it is moving towards the Sun at the speed of 10 kilometers per second.

74.40 pc
242.56 ly
-10 km/s
-0.044 arcsec/year
-0.048 arcsec/year

Spectral properties of η Andromedae

η Andromedae belongs to spectral class G8 and has a luminosity class of III corresponding to a giant star.

0.06
G8III
4892K

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

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

η Andromedae star system properties

η Andromedae 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 η Andromedae double sysyem:

4.42
11.32
6.9
131.7 arcsec

Alternative designations of η Andromedae

η Andromedae
(eta Andromedae)
38 Andromedae
SAO74388
SAO74388