Secret Still Observatory

'Sing to the Moon and the stars will shine'

Mark

1 minute read

This image was one of two made on the same night in January. The full Moon hindered and it was necessary to split the evening into two, first capturing this one and then moving on to the Cone Nebula once the target had dropped too low and disappeared behind neighbouring houses.

Mark

1 minute read

This image was made on the same night as the Bubble Nebula above. The narrowband normalisation script in PixInsight has produced some interesting and, in my view, rather interesting colours. The image is somewhat noisy owing to the short integration time and will definitely repay some additional sky time if the weather allows before it starts to drop too low as the season progresses.

Mark

1 minute read

A bright emission nebula located at a distance of 9,800 light years. The evening of 3rd Jan 2026 was dominated by a full Moon for the whole night as it tracked high across the sky. This made any broadband imaging impossible especially as the Moon’s path ran across the majority of this season’s most interesting deep sky objects. That aside, the sky was nicely stable with good transparency allowing excellent guiding with only one dropped frame in nearly thirteen hours.

Mark

1 minute read

A bright emission nebula located at a distance of 6,400 light years. Young stars at the centre of the nebula generate stellar winds and create beautiful complex patterns and shapes.

Mark

1 minute read

Melotte 15 - the heart of the Heart Nebula in Cassiopeia. 2h27m of Hydrogen Alpha at F12 (equivalent of about 40mins in the F4.5 Newtonian). It needs a lot more time and better skies to have the resolution I think it can achieve but I think it’s worth pursuing. The Classical Cassegrain 1836mm F12 + Player One Uranus M uncooled mono camera with 2.9 micron pixels gives an image resolution of 0.33 arc secs per pixel.

Mark

1 minute read

This image is made with equal numbers of short and long exposures, the short exposures made specifically to retain more detail in the bright core of the galaxy which gets blown out in normal imaging. The two sets of frames were combined using HDR Composition in PixInsight.

M10

Mark

1 minute read

Messier 10 is a very low target from 52°N and one which I had never considered photographing. The poor visibility is made worse by the poor southern horizon here. However, the short integration time has produced a remarkably good image of this beautiful globular cluster, helped by the stable sky this evening. This was really an experiment to check the collimation of the CT8 which turned out better than expected!

Mark

1 minute read

The sunspot group 4079 was so large that it was visible to the naked-eye (when viewed through eclipse glasses). In a telescope the elements were clearly visible. Due to the vagaries of the atmosphere and frequent clouds, sketching was a superior (and far more enjoyable) way to record this compared to photography.

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