Instrument: Meade 10"( longueur focale: 2800 mm) , STL11000M avec Autoguideur externe sur Diviseur optique E. Mallart, Monture: Mach1
Temps de pose: LRGB:  (6,3;3,3)*600s, binning: 1*1, Tc = -15°C, Qualité du ciel: SQ = 19.5, seeing: 2.5".
Date: 17/04/2013
Lieu: SMU

M61: distance: 60Ma, taille: 6'*6.5', mag: 9.3, brillance de surface: 21.9mag/arc-sec²

Hubble Legacy Archive: color_hst_09042_62_wfpc2_f814w_f450w_wf_sci

Bbbased on observations made with the NASA/ESA Hubble Space Telescope, and obtained from the Hubble Legacy Archive, which is a collaboration between the Space Telescope Science Institute (STScI/NASA), the Space Telescope European Coordinating Facility (ST-ECF/ESA) and the Canadian Astronomy Data Centre (CADC/NRC/CSA).