Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]

Alpherg - η Piscium (eta Piscium)

Alpherg, also designated as η Piscium (eta Piscium), is a variable and double giant star in the constellation of Pisces.

Alpherg visual magnitude is 3.62. Because of its moderate brightness, Alpherg 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 Alpherg:

Alpherg - η Piscium (eta Piscium) is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of Alpherg

Alpherg 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 Alpherg are provided in the following table:

01h 31m 28s
+15° 20’ 44”

The simplified sky map below shows the position of Alpherg in the sky:

Finder chart Alpherg - η Piscium (eta Piscium) star
Simplified finder chart for Alpherg - η Piscium (eta Piscium).

Visibility of Alpherg from your location

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

Today's Alpherg - η Piscium (eta Piscium) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 74.7°
Max altitude: 53.9°
Azimuth: 285.3°
Alpherg - η Piscium (eta Piscium) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of Alpherg

The image below is a photograph of Alpherg 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 Alpherg is 0.028 arcsec per year in Right Ascension and -0.006 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Alpherg - η Piscium (eta Piscium) star
DSS2 image of Alpherg. The red arrow shows the motion of Alpherg during the next 10000 years (4.67 arcmin in Right Ascension and -1.00 arcmin in declination);

Distance of Alpherg from the Sun and relative movement

Alpherg is distant 293.96 light years from the Sun and it is moving far from the Sun at the speed of 15 kilometers per second.

90.17 pc
293.96 ly
15 km/s
0.028 arcsec/year
-0.006 arcsec/year

Spectral properties of Alpherg

Alpherg belongs to spectral class G7 and has a luminosity class of III corresponding to a giant star.


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

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

Alpherg star system properties

Alpherg is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the Alpherg double sysyem:

0.8 arcsec

Alternative designations of Alpherg

η Piscium
(eta Piscium)