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public LocationGreenwich, United Kingdom
Sunrise: 4:42 
Transit: 12:58 
Sunset: 21:15
sunny   (Daytime)   What's Visible Now?

100 Aquarii

Below the horizon.  Rise: 2:58 | Tran: 6:59 | Set: 11:00
Altitude: -30.6°   Azimuth: 273.7°   Direction: West

100 Aquarii is a giant star of spectral class A9 in the constellation of Aquarius.

100 Aquarii visual magnitude is 6.29. Because of its faintness, 100 Aquarii is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

Celestial coordinates and finder chart of 100 Aquarii

Finder chart 100 Aquarii star
Simplified finder chart for 100 Aquarii.

100 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 100 Aquarii are provided in the following table:

23h 31m 42s
-21° 22’ 09”
Image of 100 Aquarii star
DSS2 image of 100 Aquarii. The red arrow shows the motion of 100 Aquarii during the next 100000 years (15.00 arcmin in Right Ascension and 8.33 arcmin in declination);

Key facts about 100 Aquarii


and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 100 Aquarii is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 100 Aquarii. Attribution: Richard Powell / CC BY-SA

Distance of 100 Aquarii from the Sun and relative movement

100 Aquarii is distant 261.01 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

80.06 pc
261.01 ly
-8 km/s
0.009 arcsec/year
0.005 arcsec/year

Alternative designations of 100 Aquarii

100 Aquarii

Visibility of 100 Aquarii from your location

Today's 100 Aquarii rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):

Azimuth: 111.4°
Max altitude: 17.2°
Azimuth: 248.6°