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: 4:49  
clear_day Transit: 12:56  
SunsetSet: 21:04 south
sunny DaytimeWhat's Visible Now
All Constellations » Aquarius » 

104 Aquarii

104 Aquarii is a variable and multiple hypergiant star in the constellation of Aquarius.

104 Aquarii visual magnitude is 4.82. Because of its moderate brightness, 104 Aquarii 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 104 Aquarii:

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

Celestial coordinates and finder chart of 104 Aquarii

104 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 104 Aquarii are provided in the following table:

23h 41m 45s
-17° 48’ 59”

The simplified sky map below shows the position of 104 Aquarii in the sky:

Finder chart 104 Aquarii star
Simplified finder chart for 104 Aquarii.

Visibility of 104 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 104 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: 107.8°
Max altitude: 20.7°
Azimuth: 252.2°
104 Aquarii is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 104 Aquarii

The image below is a photograph of 104 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 104 Aquarii is 0.015 arcsec per year in Right Ascension and 0.004 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 104 Aquarii star
DSS2 image of 104 Aquarii. The red arrow shows the motion of 104 Aquarii during the next 10000 years (2.50 arcmin in Right Ascension and 0.67 arcmin in declination);

Distance of 104 Aquarii from the Sun and relative movement

104 Aquarii is distant 643.00 light years from the Sun and it is moving far from the Sun at the speed of 3 kilometers per second.

197.24 pc
643.00 ly
3 km/s
0.015 arcsec/year
0.004 arcsec/year

Spectral properties of 104 Aquarii

104 Aquarii belongs to spectral class G0 and has a luminosity class of I corresponding to a hypergiant star.


The red dot in the diagram below shows where 104 Aquarii is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 104 Aquarii. Attribution: Richard Powell / CC BY-SA

104 Aquarii star system properties

104 Aquarii is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the 104 Aquarii double sysyem:

120.1 arcsec

Alternative designations of 104 Aquarii

104 Aquarii