Blue-white giant · Sagittarius

Polis

Also known as: μ Sagittarii (μ Sgr), HIP 89341

mag 3.8

About

Polis (μ Sagittarii) is a blue-white giant of magnitude 3.8 in Sagittarius.

Polis is in the constellation Sagittarius.
Best evenings: around early August 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 59° 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.

EyesVisible from the suburbs on a clear night, but lost in bright city skies.
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	Polis
Designation	μ Sagittarii (μ Sgr)
Hipparcos number	HIP 89341
Type	Blue-white giant
Spectral type	B2III:
Colour	Yellowish whiteB−V colour index 0.20
Magnitude	3.8The smaller the number, the brighter.
Proper motion	0.002″ per year across the sky
Constellation	Sagittarius
Right ascension (J2000)	18h 13m 45.8s
Declination (J2000)	−21° 03′ 32″