SPRAT / FLOYDS Analyzer

• File
  Load Fits File Save Data as CSV Save Plot as JPG Save Plot as PNG Save Plot as SVG Clear Plot
• Extensions
• Spectral Lines
• Goto Line
  H_α H_β H_γ H_δ Na D₁ Na D₂ 500.00 nm
• z =

Keyboard Controls

• right/left arrow keys move spectrum
• +/- key spreads/narrows spectrum
• up/down arrow keys spreads/narrows spectrum in flux
• Click and "v" calculates Doppler-velocity considering closest spectral line
• Click and "c" calibrates whole spectrum to closest spectral line, e.g. compensates Doppler effect
• Click and "n" opens NIST Databank search around clicked wavelength +/- 0.01 nm (calibrate spectrum first!)
• Click and "m" measures distances between points
• Click and "s" shifts spectrum e.g. calibration

Example files

SPRAT:

• M95 (Galaxy ; 90 sec ; 16.01.2026 ; 1)
• M95 (Galaxy ; 90 sec ; 16.01.2026 ; 2)
• M95 (Galaxy ; 90 sec ; 16.01.2026 ; 3)

• M96 (Galaxy ; 90 sec ; 23.01.2026 ; 1)
• M96 (Galaxy ; 90 sec ; 23.01.2026 ; 2)
• M96 (Galaxy ; 90 sec ; 23.01.2026 ; 3)

FLOYDS:

• Whirlpool Galaxy M51 (blue) ; 600 sec ; 6.0 arcsec
• Whirlpool Galaxy M51 (red) ; 600 sec ; 6.0 arcsec
• Andromeda Galaxy M31 (blue) ; 1200 sec ; 2.0 arcsec
• Andromeda Galaxy M31 (red) ; 1200 sec ; 2.0 arcsec
• Quasar 3C 273 (blue) ; 200 sec ; 1.6 arcsec
• Quasar 3C 273 (red) ; 200 sec ; 1.6 arcsec