The first album cover below shows my image of NGC 4725 a ring shaped intermediate barred spiral galaxy having a single spiral arm extending from an oval shaped ring. The blue color or the spiral arm results from the presence of many hot young stars while the central region of the galaxy has a yellow-orange color because of the large number of middle age and older stars that are much cooler. 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; it extends a rather small 9 arcminutes across the night sky.
The total integration time for this LRGB image was 6 hours and 57 minutes consisting of 14 five minute exposures with a blue filter on Jul 11 2016, 16 six minute exposures and 1 seven minute exposure with a luminance filter on Jul 6 2016, 27 five minute exposures with a luminance filter on Jun 29 2016, 4 ten minute exposures with a red filter, 4 ten minute exposures and 1 five minute exposure with a green filter, and 4 ten minute exposures with a blue filter on Jun 26 2016.
In addition to my C11 SCT I used a monochrome ATIK 460EX main imaging camera, a Lodestar X2 guide camera, an On Axis Guider, an F/6.3 Reducer, a luminance filter, RGB filters, and a Starlight Instruments motorized programmable focuser control system.
If you have any questions about my method for capturing or processing this image please ask me at: Peter.Nerbun@gmail.com
Size: 6 items
(445 items total)