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All Images Copyright Rod Gallagher
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Hickson 21 -- Galaxy Group
Object
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Type
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Galaxy Group
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Constellation
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Eridanus
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Distance
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294.0M light-years
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Magnitude
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10.1
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Size
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10.8 arc-min
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Notes
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Image contains 21A - NGC 1099, 21B - NGC 1100, 21C - NGC 1098, 21D - NGC 1092,
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21E - NGC 1091 (PGC 10424)
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Image
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Date
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2009-09-20
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Place
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Okie-Tex Star Party
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Exposure Data
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Clear 30 mins @ -15C
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C 6x5 min
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Notes
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All filters binned 1x1
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Equipment
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Optics
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Takahashi TOA-150
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Focal Length
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1100 mm @f/7.3
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Mount
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Paramount ME
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Camera
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SBIG ST-10XME
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Focuser
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RoboFocus
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Filters
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CFW-10, Astrodon CRGB
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Software
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TheSky6, CCDSoft, Focusmax, CCDAutopilot4, CCDStack 2+, PixInsight, PhotoShop CS6
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Reprocessed on 09/03/2023
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