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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: 7:45  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
sleep NighttimeWhat's Visible Now?
All Constellations » Aquarius » 

77 Aquarii

Altitude: 21.5°   Azimuth: 191.8°   Direction: South-South-West

77 Aquarii is a variable giant star in the constellation of Aquarius.

77 Aquarii visual magnitude is 5.56. Because of its reltive faintness, 77 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 77 Aquarii:


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

Altitude: 21.5°
Azimuth: 191.8°
Direction: South-South-West

Celestial coordinates and finder chart of 77 Aquarii

77 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 77 Aquarii are provided in the following table:

22h 54m 45s
-16° 16’ 18”

The simplified sky map below shows the position of 77 Aquarii in the sky:

Finder chart 77 Aquarii star
Simplified finder chart for 77 Aquarii.

Visibility of 77 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 77 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: 106.3°
Max altitude: 22.2°
Azimuth: 253.7°

Digitized Sky Survey image of 77 Aquarii

The image below is a photograph of 77 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 77 Aquarii is -0.222 arcsec per year in Right Ascension and -0.09 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 77 Aquarii star
DSS2 image of 77 Aquarii. The red arrow shows the motion of 77 Aquarii during the next 1000 years (-3.70 arcmin in Right Ascension and -1.50 arcmin in declination);

Distance of 77 Aquarii from the Sun and relative movement

77 Aquarii is distant 140.09 light years from the Sun and it is moving towards the Sun at the speed of 36 kilometers per second.

42.97 pc
140.09 ly
-36 km/s
-0.222 arcsec/year
-0.09 arcsec/year

Spectral properties of 77 Aquarii

77 Aquarii belongs to spectral class K2 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 77 Aquarii is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 77 Aquarii. Attribution: Richard Powell / CC BY-SA

Alternative designations of 77 Aquarii