American Heritage® Dictionary of the English Language, Fourth Edition
- n. The intrinsic magnitude of a celestial body computed as if viewed from a distance of 10 parsecs, or 32.6 light-years.
- n. astronomy The intrinsic luminosity that a celestial body would have if viewed from a distance of 10 parsecs or 32.6 light years.
- n. (astronomy) the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth
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