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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: 6:48  
clear_day Transit: 12:11  
SunsetSet: 17:34
sunny DaytimeWhat's Visible Now?
All Constellations » Aquarius » 

25 Aquarii

Altitude: 40.1°   Azimuth: 192.5°   Direction: South-South-West

25 Aquarii is a double hypergiant star in the constellation of Aquarius.

25 Aquarii visual magnitude is 5.1. Because of its reltive faintness, 25 Aquarii should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of 25 Aquarii is -0.026 arcsec per year in Right Ascension and -0.082 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 25 Aquarii star
DSS2 image of 25 Aquarii. The red arrow shows the motion of 25 Aquarii during the next 10000 years (-4.33 arcmin in Right Ascension and -13.67 arcmin in declination);

Key facts about 25 Aquarii


25 Aquarii is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 40.1°
Azimuth: 192.5°
Direction: South-South-West

Celestial coordinates and finder chart of 25 Aquarii

25 Aquarii 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 25 Aquarii are provided in the following table:

21h 39m 33s
+02° 14’ 36”

The simplified sky map below shows the position of 25 Aquarii in the sky:

Finder chart 25 Aquarii star
Simplified finder chart for 25 Aquarii.

Visibility of 25 Aquarii 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 25 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: 87.8°
Max altitude: 40.8°
Azimuth: 272.2°

Distance of 25 Aquarii from the Sun and relative movement

25 Aquarii is distant 240.59 light years from the Sun and it is moving towards the Sun at the speed of 35 kilometers per second.

73.80 pc
240.59 ly
-35 km/s
-0.026 arcsec/year
-0.082 arcsec/year

Spectral properties of 25 Aquarii

25 Aquarii belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where 25 Aquarii is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 25 Aquarii. Attribution: Richard Powell / CC BY-SA

25 Aquarii star system properties

25 Aquarii 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 25 Aquarii double sysyem:

136.8 arcsec

Alternative designations of 25 Aquarii