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Jyutping but6 sing1
Pinyin bó xīng

Definitions (Wiktionary)
  1. noun, archaic, figuratively
    ominous star
  2. noun, archaic
    comet, or a type of comet

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Jyutping but6 sing1
Pinyin bèi xīng

Definitions (CC-CEDICT)
  1. comet (arch.)
Definitions (Wiktionary)
  1. noun, archaic, figuratively
    ominous star
  2. noun, archaic
    comet, or a type of comet