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¤. Å. Parallax. Parallax. Parallax. Å. ¤. Parallax. Parallax. Å. ¤. Baseline. Å. Parallax. Parallax. Parallax. Parallax. Parallax. Parallax. Parallax. Parallax. Parallax. Parallax. Parallax. Parallax. Parallax. Parallax. Parallax. Parallax Limit. Resolution Seeing.
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¤ Å Parallax
Parallax Å ¤
Parallax Å ¤ Baseline Å
Parallax Limit Resolution Seeing
Parallax Limit Classical Limit 10pc 33 light years
Parallax Limit Classical Limit 10pc 33 light years Modern Limit 33pc 100 light years
Parallax Limit Classical Limit 10pc 33 light years Modern Limit 33pc 100 light years Hipparcos Limit 500pc 1650 light years
How do we find distances beyond the parallax limit? Distance Modulus
Distance Modulus Light spreads over wider area. Makes furthest stars look faint.
Distance Modulus Light spreads over wider area. Makes furthest stars look faint. apparent magnitude m Absolute Magnitude M d = 10 pc M = m
Distance Modulus d < 10 pc M > m d > 10 pc M < m apparent magnitude m Absolute Magnitude M d = 10 pc M = m
Distance Modulus - M = m + 5 5 log d
Distance Modulus - M = m + 5 5 log d
Distance Modulus - M = + 5 5 log 11.1 1.32
Distance Modulus - M = 16.1 5 0.12057
Distance Modulus - M = 16.1 0.60287