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NGC 3576/3586 (Car)
Click on the image for a larger version
| Date/Site: |
1. and 2. Februaryy 2014, Astrofarm at the Hacienda los Andes, Chile |
Exposure/
Filter |
R: 7 x 900 seconds
G: 6 x 900 seconds
B: 6 x 900 seconds
L: 8 x 900 seconds
Hα: 8 x 1200 seconds (-20°C) |
| Camera: |
SBIG STL11000 with Astronomik type II-filters |
Optics/
Instrument: |
Astro-Physics 175mm f/8 StarFire EDF triplet refractor with flattener on AP1200 GTO |
|
Guiding: Lodestar attached to a 61mm-finder,
focusing: Robofocus and FocusMax,
image acquisition: CCD-Commander and MaximDL 5,
calibration and processing: PixInsight 1.8 |
In this case the HαLRGB-version looks just all right to me. The O3-signal does not seem to be missing, in fact there is none. An O3-Filter does not improve visibility, the impression is rather one of a not resolved background of faint stars. We are simply almost blind in Hα.
NGC 3576 and NGC 3586 (Carina), Hα-frame
Click on the image for a larger version
| Date/Site: |
1. and 2. Februaryy 2014, Astrofarm at the Hacienda los Andes, Chile |
Exposure/
Filter |
Hα 8 x 1200 seconds (-20°C) |
| Camera: |
SBIG STL11000 with Astronomik type II-filters |
Optics/
Instrument: |
Astro-Physics 175mm f/8 StarFire EDF triplet refractor with flattener on AP1200 GTO |
|
Guiding: Lodestar attached to a 61mm-finder,
focusing: Robofocus and FocusMax,
image acquisition: CCD-Commander and MaximDL 5,
calibration and processing: PixInsight 1.8 |
The camera "sees" a bit more of it.
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© Friedhelm Hübner, last revision: 03.12.2023