Spectra of Galaxies

Galaxy	M77	RA (J2000)	02 42 40.7
Constellation	Cetus	Dec	-00 00 47.8
Mag (V)	8.9	Other names	NGC1068
Notes	Overall spectrum & velocity data

HAG 24" RC, ZWO ASI2600MM Pro, Lhires III, 300 gr/mm, 1 x 1800 sec, 2026-10-30

M77 closeup of Hα region showing measured wavelengths Hα siganl from the arms is doppler shifted by the galaxy rotation. As the lines are straight this indicates a constant velocity across the arms. This phenomenon is the original evidence for dark matter. Velocity calculations: Hα rest wavelength 6564.8Å Mean Hα neasured 6587.4Å Shift 24.6Å Radial velocity 1176 km/s Rotational shift 6.3Å Apparent Rotational velocity 144 km/s Inclination of galaxy 40 deg True Rotational Velocity 224 km/s