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: 4:48  
clear_day Transit: 12:56  
SunsetSet: 21:05 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Aquarius » 

101 Aquarii

101 Aquarii is a double star in the constellation of Aquarius.

101 Aquarii visual magnitude is 4.71. Because of its moderate brightness, 101 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 101 Aquarii:

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

Celestial coordinates and finder chart of 101 Aquarii

101 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 101 Aquarii are provided in the following table:

23h 33m 16s
-20° 54’ 51”

The simplified sky map below shows the position of 101 Aquarii in the sky:

Finder chart 101 Aquarii star
Simplified finder chart for 101 Aquarii.

Visibility of 101 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 101 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: 110.9°
Max altitude: 17.6°
Azimuth: 249.1°
101 Aquarii is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 101 Aquarii

The image below is a photograph of 101 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 101 Aquarii is -0.007 arcsec per year in Right Ascension and 0.013 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 101 Aquarii star
DSS2 image of 101 Aquarii. The red arrow shows the motion of 101 Aquarii during the next 10000 years (-1.17 arcmin in Right Ascension and 2.17 arcmin in declination);

Distance of 101 Aquarii from the Sun and relative movement

101 Aquarii is distant 320.24 light years from the Sun and it is moving far from the Sun at the speed of 15 kilometers per second.

98.23 pc
320.24 ly
15 km/s
-0.007 arcsec/year
0.013 arcsec/year

Spectral properties of 101 Aquarii

101 Aquarii belongs to spectral class A1


The red dot in the diagram below shows where 101 Aquarii is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 101 Aquarii. Attribution: Richard Powell / CC BY-SA

101 Aquarii star system properties

101 Aquarii is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the 101 Aquarii double sysyem:

1 arcsec

Alternative designations of 101 Aquarii

101 Aquarii