Observation by Martin Butcher: Melotte 25 - Open Star Cluster

Uploaded by

Stuart Morris

Observer

Martin Butcher

Observed

2012 Nov 01 - 02:03

Uploaded

2021 Mar 27 - 14:48

Objects

NGC1647
The Hyades (Collinder 50)

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Constellation

Taurus

Field centre

RA: 04^h29^m
Dec: +17°41'
Position angle: -1°22'

Field size

11° × 8°

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

Six sub-exposures each 5 minutes long taken at ISO400.

Location

Isle of Colonsay

Target name

NGC1647

Title

Melotte 25 - Open Star Cluster

About this image

Melotte 25, is also known as Caldwell 41, Collinder 50, and The Hyades Star Cluster. It is our nearest open star cluster and appears in the constellation Taurus.

Equipment used:- Stock Canon 40D with 50mm f/1.8 lens stopped down to f/4 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 but unguided. Telescope and camera powered by Mains Power.

Exposure details:- Six sub-exposures each 5 minutes long taken at ISO400. Ambient temperature minus one degree Celsius.

Processing details:- A single exposure was calibrated with Dark, Flat-field and Bias master frames in Images Plus. Image then further processed in Photoshop CS3 and Noise Ninja. North is at the top. Image cropped to give field of view of 19 degrees x 13 degrees.

Narrative description:- Twenty four days after New Moon. The weather was cold, clear and calm with very heavy dew. Mist had formed in the valley just below my house.

Files associated with this observation

MButcherMelotte 25 & NGC1647.jpg (353.9 kB)

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