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BO Carinae (BO Car / HD 93420 / SAO 238447) is a variable star in the constellation Carina.
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Distance
BO Carinae has a maximum apparent magnitude of +7.18. Its distance and membership is uncertain, but its possible membership to the star cluster Trumpler 15 allows a distance estimate of approximately 2,500 parsecs (8,150 light-years).
Characteristic
BO Carinae is a red supergiant of spectral type M4Ib with an effective temperature of 3,525 K. It is one of largest stars with a radius of 790 solar radii. Its bolometric luminosity reaches 78,000 times solar. Mass-loss is on the order of 0.3 × 10−9 solar masses per year.
Billed as an irregular variable like TZ Cassiopeiae or V528 Carinae; its apparent brightness fluctuates between magnitude +7.18 and +8.50 without periodicity.