NGC 4725, a spiral galaxy having one blue arm originating from an inner ring

Peter Nerbun
Location of photo
Perry Hall, Maryland USA
Date/Time of photo
June and July 2016 over 616 minutes of accumulated integration time
C11 SCT, On Axis Guider (ONAG), ATIK 460EX main imaging camera, Lodestar X2 guide camera, Losmandy G11 mount, RGB color filters, Luminance filter, HSM Stepper Motor for Starlight Feather Touch fine Micro-Focuser, Digital Boss II Focuser Control System, F/6.3 Reducer, Orion Nautilus motorized filter wheel
My image shows NGC 4725, a ring shaped intermediate barred spiral galaxy having a single spiral arm extending from an oval shaped ring. This is a 9th magnitude galaxy located 42 million light years from Earth. At 100,000 light years in diameter it is roughly the same size as our own galaxy; NGC 4725 extends a rather small 9 arcminutes across the night sky. I captured this image over a total integration time of 10 hours and 16 minutes through Luminance and RGB filters.
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