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Contains:  IC 1805
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Technical card

Resolution: 2670x3355

Dates:Nov. 17, 2018

Astrodon Ha 3nm: 19x1200" bin 1x1
Astrodon OIII 3nm: 21x1200" bin 1x1
SII 3nm: 21x1200" bin 1x1

Integration: 20.3 hours

Avg. Moon age: 9.08 days

Avg. Moon phase: 67.65% job: 2483300

RA center: 38.470 degrees

DEC center: 61.467 degrees

Pixel scale: 0.744 arcsec/pixel

Orientation: 0.291 degrees

Field radius: 0.443 degrees

Locations: E-EyE, Fregenal de la Sierra, Extremadura, Spain

Data source: Unknown


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



Steve Milne
License: None (All rights reserved)



Bit better control of stars.


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


Rework from scratch.


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.

Sky plot

Sky plot


Melotte 15 in Cassiopeia - SHO, 


            Steve Milne