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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:05 
Transit: 12:56 
Sunset: 20:48
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All Constellations » Grus » 

Alnair - α Gruis (alpha Gruis)

Below the horizon.  Never rises today
Alt: -9.43°   Az: 168.14°   Direction: South-South-East

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.

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);

Celestial Coordinates

Apparent

22h 09m 48s
-46° 50’ 09”
22h 51m 03s
21h 00m 51s

J2000

22h 08m 13s
-46° 57’ 39”

Galactic Coordinates

350°
-52.47°

Finder Chart

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Finder chart for Alnair - α Gruis (alpha Gruis).

Magnitude, Color, Spectral Class

1.74
Sub-giant

-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

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, Radial Speed, Proper Motion

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
101.37
12 km/s
0.129 arcsec/y
-0.151"/y

Alternative Designations

Alnair
α Gruis
(alpha Gruis)
SAO230992
SAO230992
Gl 848.2

Visibility from Your Location

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