Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  IC 1805
Melotte 15 in Cassiopeia - SHO, Steve Milne
Melotte 15 in Cassiopeia - SHO
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Melotte 15 in Cassiopeia - SHO, Steve Milne
Melotte 15 in Cassiopeia - SHO
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Equipment

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Acquisition details

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Description

In his catalogue of 1915, Philibert Jacques Melotte (1880-1961), a British astronomer of Belgian parentage, described object number 15 as being, ‘A very loose cluster. Somewhat similar to NGC 1027, but stars not so numerous and generally brighter’ [A catalogue of Star Clusters shown on Fraklin-Adams Chart Plates; Melotte, PJ, 12 March 1915].

Melotte 15 lies within the heart of the Heart Nebula (IC 1805), around 7,500 light years away in the constellation of Cassiopeia.

Data for Melotte 15 were gathered between 28 October and 17 November 2018 from a remote imaging rig in Spain that is owned and operated by Barry Wilson and me.

Capture details are as follows:

Telescope: TEC 140

Camera: QSI 690

Filters: Astrodon 3nm NB

Mount: 10 Micron GM2000HPS

Ha: 19 x 1200s

OIII: 21 x 1200s

SII: 21 x 1200s

A total of 20 hours and 20 minutes exposure.

Data Capture: Steve Milne & Barry Wilson

Image Processing: Steve Milne

Comments

Revisions

    Melotte 15 in Cassiopeia - SHO, Steve Milne
    Original
    Melotte 15 in Cassiopeia - SHO, Steve Milne
    B
    Melotte 15 in Cassiopeia - SHO, Steve Milne
    C
    Melotte 15 in Cassiopeia - SHO, Steve Milne
    D
    Melotte 15 in Cassiopeia - SHO, Steve Milne
    E
    Melotte 15 in Cassiopeia - SHO, Steve Milne
    F
  • Final
    Melotte 15 in Cassiopeia - SHO, Steve Milne
    G

B

Description: Bit better control of stars.

Uploaded: ...

C

Description: Forgot to crop off a black border. Also took opportunity of minor reworking of colour and contrast.

Uploaded: ...

D

Description: Rework from scratch.

Uploaded: ...

F

Description: Over the wekend the great Barry Wilson talked me through his 'tone mapping' technique, using this image as the basis for his tutorial. I was happy with the outcome, and thought I would post the result.

Uploaded: ...

Sky plot

Sky plot

Histogram

Melotte 15 in Cassiopeia - SHO, Steve Milne