Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  IC 1805
Getting plate-solving status, please wait...

Melotte 15 in Cassiopeia - SHO

Technical card

Resolution: 2638x3543

Dates:Feb. 15, 2019

Chroma Ha 3nm: 32x1200" bin 1x1
Chroma OIII 3 nm: 24x1200" bin 1x1
Chroma SII 3nm: 22x1200" bin 1x1

Integration: 26.0 hours

Avg. Moon age: 10.03 days

Avg. Moon phase: 76.71% job: 2539404

RA center: 38.752 degrees

DEC center: 61.534 degrees

Pixel scale: 1.204 arcsec/pixel

Orientation: 359.605 degrees

Field radius: 0.739 degrees

Locations: Home, Nottinghamshire, Nottinghamshire, United Kingdom

Data source: Unknown


Barry and Steve imaged Melotte 15 from their remote observatory in Spain back in November 2018. I decided that I would like to have a go at imaging it from our home observatory in the UK. The scope and camera combination gave a significantly wider field of view, but at less resolution, of course.

Capture proved ‘interesting’. We used filter focus offsets (as we usually do), but we forgot to calculate these offsets after rebuilding the rig following our trip to Spain – it was a new camera/scope combination for us. As a result, we thought we had lost 12 hours of data. As it turned out, once we calculated our offsets, the Ha and SII were thankfully pretty close to the Lum filter. So we only (!) lost around 4 hours of OIII data – that is why we ended up with so much Ha.

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 18 November 2018 and 15 February 2019 from our home observatory in the UK.

Capture details are as follows:

Telescope: Skywatcher Esprit 120ED
Camera: Moravian G2-8300
Filters: Chroma 3nm NB
Mount: Mesu 200

Ha: 32 x 1200s
OIII: 24 x 1200s
SII: 22 x 1200s

A total of 26 hours capture time.



Elisabeth Milne
License: None (All rights reserved)


Sky plot

Sky plot


Melotte 15 in Cassiopeia - SHO, 


            Elisabeth Milne

In these public groups

Women Astrophotographers