Galactic
supernova remnant (SNR) in the constellation
Gemini : remains of a
supernova that occurred 3,000 - 30,000 years ago, located at 5,000
light years from Earth, evolving in a rich and complex environment, which strongly affects its morphology. On the east, the shock wave meats à H region with a speed of 80 – 100km/s (wiki).
With regard to astrophotography, the object is interesting because of the different Ha regions and especially by the traces of ejection radiating in OIII in the periphery of the shock waves well identified by the very beautiful blue geysers and clouds.
The HSO images capture method applied consists of 60 images at 300 sec taken with the TEC 140 in Ha (with 0.72 reducer), and around 70 images taken with the FSQ-85/106 at 420 to 600 sec in OIII and SII (12,2 h). The longer exposure time with smaller diameter telescopes compensates favorably for the lower luminosity of the latter.
The ZWO ASI multi-star auto-guiding method certainly explains the very high quality of the images at 600 s.
I continue to optimize the association between different telescopes, think that a good potential for improvement still exists - what a pleasure!
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