Observation by Martin Butcher: NGC5248 or C45

Uploaded by

Stuart Morris

Observer

Martin Butcher

Observed

2012 Apr 16 - 01:06

Uploaded

2021 Aug 09 - 19:21

Objects

NGC5248

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Constellation

Bootes

Field centre

RA: 13^h37^m
Dec: +08°53'
Position angle: +20°49'

Field size

0°28' × 0°19'

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
Telescope driven but unguided

Exposure

Two hundred and forty two sub-exposures each 30 seconds long taken at ISO3200.

Location

Location:- Isle of Colonsay

Target name

NGC5248

Title

NGC5248 or C45

About this image

NGC 5248 is a compact intermediate spiral galaxy about 59 million light-years away in the constellation Boötes. It is a member of the NGC 5248 Group of galaxies

Equipment used:- Stock Canon 40D mounted at Prime Focus on Meade LX-90 8” telescope (focal ratio f/10 focal length 2,000mm) with a 0.63x Focal Reducer (giving an effective focal ratio of f/6.3 and focal length of 1,279mm) fitted to its field tripod by an equatorial wedge. Telescope Polar Aligned. LX-90 Periodic Error Correction enabled. Dew Removal straps fitted to telescope and operating. Telescope driven but unguided. Telescope and camera powered by Mains Power.

Exposure details:- Two hundred and forty two sub-exposures each 30 seconds long taken at ISO3200. Ambient temperature minus 4 degrees Celsius at the beginning and minus 6 degrees Celsius at the end.

Processing details:- After quality control 170 sub-exposures calibrated with Dark, Flat-field and Bias Master frames before being combined in Images Plus. Further processing conducted in Photoshop CS5 and Noise Ninja. North is at the top. Image cropped to give field of view of 45 arc minutes x 30 arc minutes, also 33 arc minutes x 22 arc minutes and 23 arc minutes x 15 arc minutes.

Narrative description:- Twenty four days after New Moon. The weather was cold, generally clear with thin high cloud and calm with no dew.

Files associated with this observation

MButcherNGC5248.jpg (62.5 kB)

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