Alnair
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Alp Gru
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Alpha Gruis, known as Alnair, is the brightest star of the southern constellation Grus, the crane. A blue-white B-type star, it registers a slightly negative B–V index of −0.07 and appears at apparent magnitude 1.73 from a distance of 101 light-years. Its absolute magnitude of −0.72 shows an intrinsic luminosity above the Sun's. Set at a southern declination of −46°, Alnair sits low for most northern observers while standing prominent in the southern spring sky, where it leads the scattered stars of Grus below the autumn figure of Piscis Austrinus.
Physikalische Eigenschaften
| Spektralklasse | B Class B — B-type (Blue-White) |
| Farbindex (B−V) | -0,070 |
Beobachtung
| Scheinbare Helligkeit | +1.73 |
| Absolute Helligkeit | -0,72 |
| Entfernung | 101 ly |
Position
| Rektaszension | 22h 8,23m |
| Deklination | -46° 57,66′ |