Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:47  
clear_day Transit: 12:56  
SunsetSet: 21:06 south
sunny DaytimeWhat's Visible Now
All Constellations » Aquarius » 

20 Aquarii

20 Aquarii is a hypergiant star in the constellation of Aquarius.

20 Aquarii visual magnitude is 6.36. Because of its reltive faintness, 20 Aquarii should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 20 Aquarii:

20 Aquarii is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 27°.

Celestial coordinates and finder chart of 20 Aquarii

20 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 20 Aquarii are provided in the following table:

21h 24m 51s
-03° 23’ 53”

The simplified sky map below shows the position of 20 Aquarii in the sky:

Finder chart 20 Aquarii star
Simplified finder chart for 20 Aquarii.

Visibility of 20 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 20 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: 93.4°
Max altitude: 35.1°
Azimuth: 266.6°
20 Aquarii is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 20 Aquarii

The image below is a photograph of 20 Aquarii 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 20 Aquarii is -0.006 arcsec per year in Right Ascension and -0.053 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 20 Aquarii star
DSS2 image of 20 Aquarii. The red arrow shows the motion of 20 Aquarii during the next 10000 years (-1.00 arcmin in Right Ascension and -8.83 arcmin in declination);

Distance of 20 Aquarii from the Sun and relative movement

20 Aquarii is distant 232.36 light years from the Sun and it is moving towards the Sun at the speed of 23 kilometers per second.

71.28 pc
232.36 ly
-23 km/s
-0.006 arcsec/year
-0.053 arcsec/year

Spectral properties of 20 Aquarii

20 Aquarii belongs to spectral class F0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where 20 Aquarii is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 20 Aquarii. Attribution: Richard Powell / CC BY-SA

Alternative designations of 20 Aquarii