Blue-white star · Cassiopeia

Segin

Also known as: ε Cassiopeiae (ε Cas), HIP 8886

mag 3.4410 light-years

About

Segin (ε Cassiopeiae) is a blue-white star of magnitude 3.4 in Cassiopeia, about 410 light-years away.

Segin is in the constellation Cassiopeia.
Best evenings: around early December 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 north of 16° S.
Star patterns: Cassiopeia’s W.

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	Segin
Designation	ε Cassiopeiae (ε Cas)
Hipparcos number	HIP 8886
Type	Blue-white star
Spectral type	B2pvar
Colour	Blue-whiteB−V colour index −0.15
Magnitude	3.4The smaller the number, the brighter.
Distance	410 light-yearsThe light you see left it around 1610.
Proper motion	0.037″ per year across the sky
Constellation	Cassiopeia
Right ascension (J2000)	01h 54m 23.7s
Declination (J2000)	+63° 40′ 12″