Location / Date

Zellerndorf, 02., 04. und 22. April 2011

Telescope / Mount / Guiding

10" f4,7 Skywatcher Newtonian, Skywatcher NEQ6, Baader MPCC, Lacerta OAG + Mgen

Camera / Exposure

Canon EOS 1000Da, 100 x 5min ISO 800, 22 x 10min ISO 400 (total 12h)

Processing

Theli, Fitswork, Photoshop

Notes

NGC 4151 is an intermediate spiral Seyfert galaxy located 43 million light years from Earth in the constellation Canes Venatici. It is one of the nearest galaxies to Earth to contain an actively growing supermassive black hole; it was determined in 2012 that there are two black holes, with about 40 million and about 10 million solar masses respectively, orbiting with a 15.8-year period.