Friday, 6 March 2026

The Seagull and Rosette nebulae with Altair duo-band filters

The equipment used was an Altair Starwave ASCENT 60ED doublet refractor with field-flattener, a Pegasus FocusCube v2 focuser, an Altair Hypercam 533C 14 bit OSC CMOS camera and a PlayerOne Phoenix 2" filter wheel all mounted on a Celestron AVX GOTO mount. An SVBONY SV165 guide scope with a natively connected QHY-5II-M guide camera was used for PHD2 multistar pulse auto-guiding via an INDI server. The mount, and focuser were controlled by AstroDMx Capture via the INDI server and the Altair Hypercam 533C and the PlayerOne Phoenix 2" filter wheel were controlled natively.

Click on an image to get a closer view

The Equipment


Altair dual-band 2" S2O3 and HaO3 filters were used.

AstroDMx Capture running on an Ubuntu mini computer was used to capture 5-minute exposures through each filter of the Rosette nebula and C50 the Harp cluster as well as of the Seagull nebula IC2177. A total of 1hour 30minutes worth of data: 45 minutes through each filter were captured of each nebula.

Pixinsight was used to stack and calibrate the data. The data were further processed in PixInsight, GraXpert, SetiAstroSuitePro and Gimp3. The Ha, S2 and O3 channels were separated out from the HaO3 and S2O3 images and used to contruct narrowband palettes. Siril was used for pixelmath procedures.

The Seagull nebula IC2177

Hubble palette


HOS (Canada, France, Hawaii telescope palette: CFHT)


OSH


Pixelmath generated palettes

Gendler palette


ForaaX palette


The Rosette nebula and C50 the Harp cluster

Hubble palette



(Canada, France, Hawaii telescope palette: CFHT)



OSH



Pixelmath generated palettes

Gendler palette



ForaaX palette



The PlayerOne Phoenix 2" filter wheel was controlled natively by AstroDMx Capture and proved very useful for rapid filter change of the parfocal Altair 2" filters.