Tag Archives: H-alpha


Helix Nebula in H-alpha from Sydney

Deep H-alpha image of the Helix Nebula obtained from my backyard, 15 km from Sydney’s city centre.

This image combines the best 40 frames of the 82 frames I got the nights of 24-30 August, 7, 12 and 15 September 2020 using the ZWO ASI1600MM Pro and the H-alpha Baader 3.5nm ultra-narrow filter.

All frames had an exposition time of 900s (15 minutes), hence this image combines a total of 10 hours of telescope time!

Telescope: Skywatcher Black Diamond 80, f=600mm (f/7.5)

Equipment: I used the ZWO ASIAir to control the camera, the mount (Skywatcher AZ-EQ6) and the guiding system (ASI120MM + Orion 50mm finderscope). The H-alpha filter was in the ZWO filter drawer.

Processing: Data processed with Siril software. FITS converted on TIFF using NASA’s Fits Liberator considering a logarithmic function. Color / saturation / levels / contrast / smart sharpen with Photoshop.

I hope to get soon some data in broad-band filters to get the colours!

Full resolution image in my Flickr.

Credit: Ángel R. López-Sánchez (AAO-MQ).


The Heart of the Carina Nebula in H-alpha

The center of the Carina Nebula, with the bright star Eta Carinae and the Keyhole feature, in H-alpha.

Data taken from the backyard at home, ~15 km from Sydney’s city centre, on Monday 19th and Tuesday 21st April 2020.

Equipment: Skywatcher Black Diamond 80 (F=600mm, f/7.5), Skywatcher AZ-EQ6 (mount), ZWO ASI178MC (main camera), ZWO ASI120MM + Orion 50mm guidescope (guiding), 2″ Baader ultra-narrow (3.5 nm) H-alpha filter, and ASIair controlling everything (using my son’s iPad).

This image combines 35 x 600s light frames, and 30 x 600s dark frames. Aligned and stacked with SiriL, stretching, colour contrast, saturation, levels, and luminosity with Photoshop.

Full resolution image in my Flickr.

Credit: Ángel R. López-Sánchez (AAO-MQ).