| Target: |
M81, a spiral galaxy. Also known as NGC 3031 or Bode's Galaxy. M81 in Wikipedia |
Date: | 2.2.2009 .. 3.2.2009 |
| Time: | 23:18 .. 01:35 [UTC] | ||
| Location: | Frankfurt am Main, Germany | ||
| Conditions: | T 1°C. Sky not very dark as Moon was still setting during exposures (Alt 14° to 5°), and in first quarter -phase. | ||
| Telescope: | N150 f5 (GSO) | Mount: | Sky-Watcher EQ6 Pro in EQASCOM control |
| Camera: | Art-429 (beta) TEC set to -15K delta-T |
Filters: | "AL" LRGB set. Interference type, with UV-blocking on Luminance. |
| Exposure: |
66.7min LRGB L: 42min (90s subs), R: 7.3min, 2x2 bin (40s subs), G: 7.3min, 2x2 bin (40s subs), B: 10min, 2x2 bin (40s subs) Guided with 70/500mm achromatic refractor, modified webcam (SC3) and PHD Guiding to EQASCOM (pulseguide) |
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| Processing: |
Dark frames and flatfields. Unsharp masking on the galaxy. Lots of level / color balance adjustments. |
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| Images: |
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| Notes: | |||
