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: 4:46  
clear_day Transit: 12:56  
SunsetSet: 21:07 south
sunny DaytimeWhat's Visible Now
All Constellations » Aquarius » 

4 Aquarii

Altitude: -38.6°   Azimuth: 323.3°   Direction: North-West

4 Aquarii is a variable and multiple main-sequence star in the constellation of Aquarius.

4 Aquarii visual magnitude is 5.99. Because of its reltive faintness, 4 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 4 Aquarii:


4 Aquarii is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -38.6°
Azimuth: 323.3°
Direction: North-West

Celestial coordinates and finder chart of 4 Aquarii

4 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 4 Aquarii are provided in the following table:

20h 51m 25s
-05° 37’ 35”

The simplified sky map below shows the position of 4 Aquarii in the sky:

Finder chart 4 Aquarii star
Simplified finder chart for 4 Aquarii.

Visibility of 4 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 4 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: 95.6°
Max altitude: 32.9°
Azimuth: 264.4°
4 Aquarii is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 4 Aquarii

The image below is a photograph of 4 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 4 Aquarii is 0.099 arcsec per year in Right Ascension and -0.001 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 4 Aquarii star
DSS2 image of 4 Aquarii. The red arrow shows the motion of 4 Aquarii during the next 1000 years (1.65 arcmin in Right Ascension and -0.02 arcmin in declination);

Distance of 4 Aquarii from the Sun and relative movement

4 Aquarii is distant 192.10 light years from the Sun and it is moving towards the Sun at the speed of 25 kilometers per second.

58.93 pc
192.10 ly
-25 km/s
0.099 arcsec/year
-0.001 arcsec/year

Spectral properties of 4 Aquarii

4 Aquarii belongs to spectral class F5 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where 4 Aquarii is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 4 Aquarii. Attribution: Richard Powell / CC BY-SA

4 Aquarii star system properties

4 Aquarii is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the 4 Aquarii double sysyem:

1.1 arcsec

Alternative designations of 4 Aquarii