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A few Spring galaxies with the Vixen VISAC VC200L

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23 April 2011
Picture of NGC 3718 with 62 frames of 30s each (31 min total exposure).
Transparency was quite poor, with limit magnitude about 3 to 3.5 with naked eye. The sky gradient (remove gradient - polynomial fit) was removed with Iris.




30 April 2011
Transparency was exceptional for Netherlands, with limit magnitude around 5 !
Picture of M51 with 60 frames of 30s each (30 min total exposure). The seeing was good, star FWHM (from Audela software) was around 2.6 x 3.2 arcsec, with the largest value in the E-W direction.




Picture of M63 with 121 frames of 30s each (60.5 min total exposure). Seeing was not so good as for M51, star FWHM (from Audela) about 3.0 x 3.6 arcsec. The sky gradient was removed with Iris (remove gradient - polynomial fit).