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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
north SunriseRise: 7:41  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
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All Constellations » Aquarius » 

Sadachbia - γ Aquarii (gamma Aquarii)

Altitude: 32.6°   Azimuth: 211.7°   Direction: South-South-West

Sadachbia, also designated as γ Aquarii (gamma Aquarii), is a variable and double hypergiant star in the constellation of Aquarius.

Sadachbia visual magnitude is 3.84. Because of its moderate brightness, Sadachbia 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 Sadachbia:


Sadachbia - γ Aquarii (gamma Aquarii) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 32.6°
Azimuth: 211.7°
Direction: South-South-West

Celestial coordinates and finder chart of Sadachbia

Sadachbia 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 Sadachbia are provided in the following table:

22h 21m 39s
-01° 23’ 13”

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

Finder chart Sadachbia - γ Aquarii (gamma Aquarii) star
Simplified finder chart for Sadachbia - γ Aquarii (gamma Aquarii).

Visibility of Sadachbia 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 Sadachbia - γ Aquarii (gamma Aquarii) 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: 91.4°
Max altitude: 37.1°
Azimuth: 268.6°

Digitized Sky Survey image of Sadachbia

The image below is a photograph of Sadachbia 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 Sadachbia is 0.132 arcsec per year in Right Ascension and 0.007 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Sadachbia - γ Aquarii (gamma Aquarii) star
DSS2 image of Sadachbia. The red arrow shows the motion of Sadachbia during the next 1000 years (2.20 arcmin in Right Ascension and 0.12 arcmin in declination);

Distance of Sadachbia from the Sun and relative movement

Sadachbia is distant 157.72 light years from the Sun and it is moving towards the Sun at the speed of 15 kilometers per second.

48.38 pc
157.72 ly
-15 km/s
0.132 arcsec/year
0.007 arcsec/year

Spectral properties of Sadachbia

Sadachbia belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.


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

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

Sadachbia star system properties

Sadachbia 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 Sadachbia double sysyem:

37.4 arcsec

Alternative designations of Sadachbia

γ Aquarii
(gamma Aquarii)