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M51, the Whirlpool Galaxy, is a classic face-on spiral galaxy in Canes Venatici.
To see the difference that more exposure makes in improving the signal-to-noise ratio, hold your mouse cursor over the image to see a comparison between a single 10-minute exposure and a stack of ten 10-minute exposures.
Companion galaxy NGC 5195 is seen to the left (north) of M51. It is interacting with M51.
Exposure Data
- Lens: Astro-Physics 130EDT F/8 Triplet Apochromatic Refractor
- F/stop: f/8
- Exposure: Stack of ten 10-minute exposures (100 minutes total exposure)
- Mount: Losmandy GM100EQ Polar-aligned tracking equatorial mount
- Guiding: Autoguided SBIG ST-4
- Camera: Canon EOS 20Da DSLR
- Mode: Raw
- ISO: 800
- White Balance: Custom
- In-Camera Noise Reduction: Off
- Filter: None
- Temp: 40F
- Time Start 2:31 a.m. EDT
- Date April 30, 2006
- Location: DelMarVa Star Party, Tuckahoe State Park, MD
- Calibration: Darks and Bias in Images Plus
- Processing: Stacked in Images Plus. Color correction, image enhancement in Photoshop CS2
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