Tarantula nebula HOO

NGC2070

 

I used remote observatory, iTelescope, to took this image.

 

The plan started at the beginning of September 2019. I acquired L, R, G, B, SII, H-alpha, OIII each 300s*1. I did LRGB, SHO, HOO color mapping, and I found out that the luminous frame is bright (or less noise), but the nebulosity is not as sharp as narrowband frames. Since the SII frame is much dimmer than others, I experimentally took single 900s SII subframe. The Hubble Palette image with S:H:O=9:3:3 still shows water blue color (bule+green) in nebulosity and, badly, very red color in star. I did some google search, notice that there might be not so many SII emission at this place. "Ok, I need to change the strategy." I talked to myself at that time.

 

After that, I focus on HOO composition. I took an extra nine subframes each with H-alpha and OIII filter. Finally, HOO color nebula combines with LRGB stars makes this image more nature.

 

The plan will be continuous...

 

Time: 2019/09

iTelescope T31

OTA: Planewave 20" CDK

Aperture: 510mm

Focal Length: 2259mm

F/Ratio: f/4.4

CCD: FLI-PL09000

LRGB: 300s*1 (each)

H-alpha: 300s*10

OIII: 300s*10

Data Source: iTelescope remote observatory. My friend offers me observe time, and I make the observational plan.

Done