星斗 is read as せいと (seito) and means star.
せいと
seito
ほくとしちせい
the Big Dipper (asterism)
なんとろくせい
Milk Dipper
ほくとせい
せいじょうき
Star-Spangled Banner (US anthem)
せいしせいけい
star tracker
せいじょうきしんぶん
Stars and Stripes (newspaper)
せいざとうえいき
planetarium (projector)
せいけい
star system
せいりょうじょしたんだい
Seiryō Women's Junior College
ほしかげ
starlight
ます
box (seating at a theatre, etc.)
と
Chinese "Dipper" constellation (one of the 28 mansions)