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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. |
| Description |
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.
|