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Sher 25 is a blue supergiant star in the constellation Carina , located approximately 25,000 light years from the Sun in the H II region NGC 3603 of the Milky Way .. Carina. Carina ( constellation ). blue supergiant. blue supergiant. star. star. constellation. constellation. light years. light years. Sun. Sun. H II region. H II region. NGC 3603. NGC 3603. It is a spectral type B1Iab star with an apparent magnitude of 12.2 .. star. star. spectral type. spectral type. apparent magnitude. apparent magnitude. Its initial main sequence mass is calculated at 60 times the mass of our Sun , but a star of this type will have already lost a substantial fraction of that mass .. star. star. Sun. Sun. It is unclear whether Sher 25 has been through a red supergiant phase or has just evolved from the main sequence , so the current mass is very uncertain .. red supergiant. red supergiant. The name derives from the original cataloguing of stars in NGC 3603 by David Sher .. NGC 3603. NGC 3603. This catalogue entry is more properly referred to as NGC 3603 Sher 25 to distinguish it from stars numbered 25 by Sher in other clusters .. NGC 3603. NGC 3603. The same star was numbered 13 by Melnick , Tapia , and Terlevich -LRB- NGC 3603 MTT 13 -RRB- and 5 in a Hubble Space Telescope survey by Moffat , Drissen , and Shara -LRB- NGC 3603 MDS 5 -RRB- .. star. star. NGC 3603. NGC 3603. It is speculated that Sher 25 is near the point of going supernova , as it has recently thrown off matter in a pattern similar to that of supernova 1987A in the Large Magellanic Cloud , with a circumstellar ring and bipolar outflow filaments .. supernova. supernova. supernova 1987A. supernova 1987A. Large Magellanic Cloud. Large Magellanic Cloud. Regular variations in the doppler shift of the star 's spectral lines with a period of a few days have suggested orbital motion about a companion star , but pulsations are a more likely explanation .. star. star. doppler shift. doppler shift