Observation by Martin Butcher: NGC 185 and NGC 147- Dwarf Spheroidal Ga...

Uploaded by

Stuart Morris

Observer

Martin Butcher

Observed

2010 Oct 10 - 23:33

Uploaded

2021 Mar 27 - 17:02

Objects

NGC147
NGC185

Equipment

Meade LX-90 8" telescope fitted to its field tripod by an equatorial wedge.
LX-90 Periodic Error Correction enabled.
Dew Removal straps fitted to telescope and camera lens
Telescope and camera powered by Mains Power.
Stock Canon 40D with 200mm f/2.8 lens stopped down to f/4

Exposure

Ten sub-exposures each 10 minutes long taken at ISO800.

Location

Isle of Colonsay

Target name

NGC147

Title

NGC 185 and NGC 147- Dwarf Spheroidal Galaxies

About this image

NGC 147 and NGC 185 are dwarf spheroidal galaxies in the constellation Cassiopeia.

Equipment used:- Stock Canon 40D with 200mm f/2.8 lens mounted piggy-back on Meade LX-90 8" telescope fitted to its field tripod by an equatorial wedge. Telescope polar aligned. Telescope driven but unguided. Telescope and camera powered by Mains Power.

Exposure details:- Ten sub-exposures each 10 minutes long taken at ISO800. Ambient temperature was 6 degrees Celsius.

Processing details:- After quality control 7 sub-exposures calibrated with Dark, Flat-field and Bias master frames before being combined in Images Plus. This image was then further processed in Photoshop CS3 and Noise Ninja. North is at the top. Image cropped to give field of view of 2.5 degrees x 1.6 degrees.

Narrative description:- Three days after New Moon, the Moon had set before the images were taken. The weather was cold and clear with a stiff breeze from the north east (the telescope was therefore set up to the west of my house). Due to the wind there was no dew.

Files associated with this observation

MButcherNGC147 & NGC185.jpg (177.0 kB)

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