Hanging like brilliant colorful jewels in the night, Kemble's Cascade is an asterism consisting of an almost straight line of more than a dozen 5th to 10th magnitude stars spanning about two and a half degrees in the constellation of Camelopardalis. It runs from lower left, near open cluster NGC 1502, to upper right in this image.
An asterism is a random grouping of stars that seem to align from our perspective, unlike star clusters where the stars are physically associated with each other and occupy the same general area of space.
Exposure Data
- Lens: Stellarvue SV70ED f/6
- F/stop: f/4.8 with Astro-Tech 0.8x Focal Reducer
- Focal Length: 336mm
- Exposure: Composite of 35 minutes total exposure
- 1 x 600 seconds at ISO 200
- 1 x 300 seconds at ISO 200
- 1 x 600 seconds at ISO 100
- 2 x 300 seconds at ISO 100
- Mount: Takahashi EM200 Temma 2M
- Camera: Modified Canon EOS 550Da (T2i) DSLR
- Mode: Raw
- White Balance: Custom
- In-Camera Noise Reduction: Off
- Filter: Minus-Violet
- Conditions: Temp:30F, RH:71%, SQM:20.53, clouds:0, wind:0, dew:4
- Time: 11:30 p.m. EST
- Date December 2, 2011
- Location: Steelmantown, NJ
- Calibration: None
- Processing: Registar, Photoshop CS5, Noel Carboni's Star Spikes Pro
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