Blue-white subgiant · Scorpius

Dschubba

Also known as: δ Scorpii (δ Sco), HIP 78401

mag 2.3490 light-years

About

Dschubba (δ Scorpii) is a blue-white subgiant of magnitude 2.3 in Scorpius, about 490 light-years away.

Dschubba is in the constellation Scorpius.
Best evenings: around early July it is highest at about 9 pm (10 pm in summer time); a month earlier, two hours later.
Where on Earth: it is seen well, at least 10° up, from south of 57° N.

When it rises and sets tonight, how high it climbs and how much the Moon gets in the way are worked out in your browser for your place.

EyesEasy, even from town. It looks blue-white.
Binoculars (10×50)A sharp point; binoculars bring out its colour and the fainter stars around it.
Telescope (6–8 inch)Still a point of light at any magnification — stars are too far away to show a disc. Low in the sky, bright stars twinkle and flash colours.

Stars look the same in any instrument: brighter and sharper, but never bigger.

Proper name	Dschubba
Designation	δ Scorpii (δ Sco)
Hipparcos number	HIP 78401
Type	Blue-white subgiant
Spectral type	B0.2IV
Colour	Blue-whiteB−V colour index −0.12
Magnitude	2.3The smaller the number, the brighter.
Distance	490 light-yearsThe light you see left it around 1540.
Proper motion	0.038″ per year across the sky
Constellation	Scorpius
Right ascension (J2000)	16h 00m 20.0s
Declination (J2000)	−22° 37′ 18″