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Catalogue and alternative designations BlDz 1, ESO 217-11


Type Planetary Nebula
Position 11 53 06.60  -50 50 59.2
Constellation Centaurus
Camera and Telescope SBIG STXL16200 and 36.8cm Ritchey Chretien
Focal Ratio F9
Exposure Details This is a LHaOIIIOIIIRGB image with Hydrogen Alpha = 360 minutes and Oxygen III = 390 minutes. Luminance = 120 minutes, R=G=B= 20 minutes. The luminance was unbinned and the colours were binned 2x2.

An extremely obscure 1.5 arcminute planetary nebula that despite being reasonably bright, wasn't discovered until 1975 by Adriaan Blaauw, I.J. Danziger and Hans-Emil Schuster. It consists of two overlapping shells, the larger one is transparent and the smaller inner one is also rather thin. Hartung claims this is visible in 30 cm.