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

Alnair - α Gruis (alpha Gruis)

Below the horizon.  Never rises today
Altitude: -28.4°   Azimuth: 229.1°   Direction: South-West

Alnair, also designated as α Gruis (alpha Gruis), is a variable and double sub-giant star of spectral class B7 in the constellation of Grus.

Alnair visual magnitude is 1.74, making it the 30th brightest star in the sky. Because of its brightness, Alnair is clearly visible to the naked eye when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

Celestial coordinates and finder chart of Alnair

Finder chart Alnair - α Gruis (alpha Gruis) star
Simplified finder chart for Alnair - α Gruis (alpha Gruis).

Alnair is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Alnair are provided in the following table:

22h 08m 13s
-46° 57’ 39”
350°
-52.47°
Grus
Image of Alnair - α Gruis (alpha Gruis) star
DSS2 image of Alnair. The red arrow shows the motion of Alnair during the next 1000 years (2.15 arcmin in Right Ascension and -2.52 arcmin in declination);

Key facts about Alnair

1.74
Sub-giant

and has a luminosity class of IV corresponding to a sub-giant star.

-0.72
B7IV
12103K

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

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

Alnair star system properties

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

1.74
11.84
10.1
28.4 arcsec

Distance of Alnair from the Sun and relative movement

Alnair is distant 101.37 light years from the Sun and it is moving far from the Sun at the speed of 12 kilometers per second.

31.09 pc
101.37 ly
12 km/s
0.129 arcsec/year
-0.151 arcsec/year

Alternative designations of Alnair

Alnair
α Gruis
(alpha Gruis)
SAO230992
SAO230992
Gl 848.2

Visibility of Alnair from your location

Alnair - α Gruis (alpha Gruis) is currently not visible from Greenwich, United Kingdom