Observation by Martin Butcher: Leo I galaxy group

Uploaded by

Stuart Morris

Observer

Martin Butcher

Observed

2010 Mar 07 - 00:28

Uploaded

2021 Apr 08 - 19:48

Objects

M95
M96
M105
NGC3384
NGC3389

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Constellation

Leo

Field centre

RA: 10^h45^m
Dec: +12°08'
Position angle: +0°24'

Field size

2°23' × 1°34'

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

Total of 14 sub-exposures each 5 minutes long taken at ISO800 (seven in each session)

Location

Isle of Colonsay

Target name

M95, M96, M105, NGC3384 & NGC3389

Title

Leo I galaxy group

About this image

Leo I Group of galaxies.

M95 (NGC 3351) is a barred spiral galaxy located in the constellation Leo.

M96 (NGC3368), is an intermediate spiral galaxy in the constellation Leo.

M105 (NGC 3379), is an elliptical galaxy in the equatorial constellation of Leo.

NGC3384 is an elliptical galaxy in the constellation Leo.

NGC3389 is an Spiral galaxy in the constellation Leo.

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. LX-90 Periodic Error Correction enabled. Dew Removal straps fitted to telescope and camera lens and operating. Telescope driven and manually guided. Telescope and camera powered by Mains Power.

Exposure details:- Total of 14 sub-exposures each 5 minutes long taken at ISO800 (7 in each session). Ambient temperature minus 4 degrees Celsius in first session and minus one degree Celsius in second session.

Processing details:- After quality control 12 sub-exposures calibrated with Dark, Flat-field and Bias master frames before being combined in Images Plus. Image then further processed in Photoshop CS3 and Noise Ninja. North is at the top.

Narrative description:-

2010 March 7/0028-0100 UT. Twenty one days after New Moon, but Moon did not rise until after the session had come to a close. The weather was cold, clear and calm with heavy dew. The session was brought to a premature end by a cloud sheet that rolled over.

2010 March 7-8/2333-0006 UT. Twenty two days after New Moon, again the Moon did not rise until after the sequence of images had been taken. The weather was cold and clear; however, on this evening there were occasional breezy gusts from the south south west (the telescope was set up to the east of my house) and consequently there was no dew.

Files associated with this observation

MButcherNGC3351 or M95 & NGC3368 or M96 & NGC3379 or M105 & NGC3384 & NGC3389.jpg (123.3 kB)

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