η Andromedae (eta Andromedae)

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 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 η Andromedae:

Color of η Andromedae ⬤

Magnitude of η Andromedae 4.42

Class Giant

VISIBILITY RIGHT NOW η Andromedae (eta Andromedae) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 9°.

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:

Right Ascension J2000 00h 57m 12s

Declination J2000 +23° 25’ 03”

Galactic Longitude 124.65°

Galactic Latitude -39.43°

Constellation 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 [change]
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 [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 66.6° RISE 5:29

Max altitude: 61.9° TRANSIT 13:38

Azimuth: 293.4° SET 21:47

RIGHT NOW η Andromedae (eta Andromedae) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of η Andromedae

The image below is a photograph of η 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 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);

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.

Distance (parsec) 74.40 pc

Distance (light year) 242.56 ly

Heliocentric radial velocity -10 km/s

Proper Motion RA -0.044 arcsec/year

Proper Motion Dec -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.

Absolute magnitude 0.06

Spectral Type G8III

Color Index (B-V) 0.94

Temperature of η Andromedae 4892K

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

Main star magnitude 4.42

Secondary star magnitude 11.32

Magnitude difference 6.9

Separation 131.7 arcsec

Alternative designations of η Andromedae

Bayer designation η Andromedae
(eta Andromedae)

Flamsteed designation 38 Andromedae

Henry Draper Catalogue HD5516

SAO Catalogue SAO74388

Hipparcos Catalogue HIP4463

Durchmusterung Catalogue BD+22 153

FK5 Catalogue 2060

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