Orange main-sequence star · Ophiuchus

Guniibuu B

Also known as: 36 Ophiuchi (36 Oph)

mag 5.120 light-years

About

Guniibuu B (36 Ophiuchi) is an orange main-sequence star of magnitude 5.1 in Ophiuchus, about 20 light-years away.

Guniibuu B is in the constellation Ophiuchus.
Best evenings: around late 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 53° 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.

EyesNeeds a dark sky away from city lights.
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	Guniibuu B
Designation	36 Ophiuchi (36 Oph)
Type	Orange main-sequence star
Spectral type	K1 Ve
Colour	Pale orangeB−V colour index 0.85
Magnitude	5.1The smaller the number, the brighter.
Distance	20 light-yearsThe light you see left it around 2006.
Proper motion	1.23″ per year across the sky
Constellation	Ophiuchus
Right ascension (J2000)	17h 15m 20.6s
Declination (J2000)	−26° 36′ 12″