| 1. | Its spectral class is Y0.5 ( initially was estimated as Y0 ).
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| 2. | Nevertheless, several objects have been assigned spectral classes Y0, Y1, and Y2.
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| 3. | It is the " archetypal member " of the Y spectral class.
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| 4. | The spectral class is F9V and its combined apparent magnitude is + 4.90.
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| 5. | Fidelio contains both metals and carbon ( Spectral class XC ).
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| 6. | Unusually the hydrogen emission is stronger still, leading to a WN8h spectral class.
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| 7. | The spectral class M1 ), is surrounded by a large, red reflection nebula.
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| 8. | It has a spectral class of B9 and is 40 parsecs from Earth.
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| 9. | Its spectral class is O9.5Ve, meaning that it is an O-type main-sequence star.
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| 10. | Spectral class-A stars are hotter and more massive than the Sun.
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