Theta1 Orionis LHaRGB - The Trapezium - The Heart of Orion (andrea tasselli)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: Great Orion Nebula · M 42 · NGC 1976 · Orion Nebula · The star θ1Ori · The star θ2Ori

Theta1 Orionis LHaRGB - The Trapezium - The Heart of Orion, andrea tasselli

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Theta1 Orionis LHaRGB - The Trapezium - The Heart of Orion

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Theta1 Orionis LHaRGB - The Trapezium - The Heart of Orion

As my 100th image here on Astrobin let me present you with one of the images I am most fond of: The Trapezium i.e. Theta1 Orionis (and surrounding nebula).

The gestation of this image starts from, as was usual at the time, a definition of a "hard" subject as was back in the early 00's. Here the difficulties lay in cleanly split the A and C components of the Trapezium from, respectively, the E and F components, given the significant magnitude difference. The separation in itself isn't that great (4.6" and 4.5" respectively) but the challenging bit is to image both them cleanly separated AND the nebula in the background. One of the contentious issue is whether instruments with significant central obstructions (e.g. SC or fast Maks) would be able to pull it out, as the diffraction rings would tend to overlap with the fainter companions of A and C, C being the most difficult to separate given its brightness, thus obliterating them. Normally it is easy to separate H1 and H2 (with a separation of 1.6") which have nearly identical magnitudes but C-F and A-E are another matter altogether.

Obviously I couldn't pass this challenge by and did prove that you can image the Trapezium cleanly separated AND the surrounding nebula using broadband filters (or no-one at all) with a fast Mak (with CO of 34%) of modest aperture, thus proving a lot of people wrong.

This was also my parting shot for my previous house in Italy as I moved to England once more.

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Theta1 Orionis LHaRGB - The Trapezium - The Heart of Orion

Theta1 Orionis LHaRGB - The Trapezium - The Heart of Orion

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Theta1 Orionis LHaRGB - The Trapezium - The Heart of Orion

Theta1 Orionis LHaRGB - The Trapezium - The Heart of Orion

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