Eta Carinae Nebula, taken with 4-inch Astro-Physics Traveler refractor at f/6 with 6x7 field flattener and Hutech-modified Canon 5D camera for stack of 5 x 15 minute exposures at ISO 400. Taken from Coonabarabran, NSW, Australia, April 22, 2007. Surpasses image taken in 2006 in July, at ISO800 and with Eta Car lower in sky.
The core area of the Carina Nebula, with the bright star Eta Carinae and its Homunculus Nebula overexposed at centre, and the darker region of the Keyhole Nebula to the right of Eta. The star cluster at upper right is Trumpler 14. The grouping around Eta Carinae itself is Trumpler 16. This is an L-RGB stack of 2 to 4 exposures from 60s to 150s for each channel, taken with the T33 RCOS reflector telescope at the Siding Spring iTelescope installation on May 7, 2019 under robotic control. T33 is a 320mm aperture (12.5-inch) f/9 Ritchey-Chretien Cassegrain with an Apogee CCD camera) with 4096 x 4096 pixels) and on a Paramount mount. My script called for more sub-frames to be shot but the session truncated, and indeed the last frames had trailed stars, I suspect because of the scope reaching its limit of tracking across the meridian without flipping, as this target was due south during my session. Images registered and stacked in PixInsight (using Median and Winsorized Sigma stack mode) to create separate masters for each channel, but merged to an LRGB image using Photoshop. Median filter applied to the RGB layer to eliminate the hot pixels remaining despite the on-site image calibration.
NGC 3766, the Pearl Cluster, at top and the Lambda Centauri nebula, aka the Running Chicken Nebula or IC 2948, at the bottom. This is a stack of 2 x 7-minute exposures at ISO 800 with the original filter-modified Canon 5D through the Asrtro-Physics Traveler refractor at f/6. Taken from Coonabarabra, NSW, Australia.
