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A tulip in space (SH2-101, HaRGB), 


            Sven Hoffmann
A tulip in space (SH2-101, HaRGB)

A tulip in space (SH2-101, HaRGB)

Technical card

Resolution: 4565x3157

Dates:July 20, 2018Aug. 10, 2018Aug. 11, 2018

Baader 7nm Ha: 63x180" (gain: 139.00) -20C bin 1x1
B: 20x30" -20C bin 1x1
G: 17x30" -20C bin 1x1
R: 18x30" -20C bin 1x1

Integration: 3.6 hours

Darks: ~16

Flats: ~16

Flat darks: ~16

Avg. Moon age: 12.21 days

Avg. Moon phase: 19.44%

Bortle Dark-Sky Scale: 5.00

Mean FWHM: 2.75

Temperature: 15.00 job: 2205980

RA center: 300.351 degrees

DEC center: 35.397 degrees

Pixel scale: 1.411 arcsec/pixel

Orientation: 34.169 degrees

Field radius: 1.087 degrees

Data source: Backyard


Hi guys,

I am very proud of this image. I know this is hard to see without using the 100% view but I spend a lot of time doing cable management and balancing recently until I got it near perfect. My work paid off by giving me consistent guiding of 0.3"-0.4" RMS in both axis over about 20h of imaging now. This was the first image I took after all the changes. This is a result I had never expected to get from my little mount and 9kg payload. This resulted in a lot sharper images (2.3" FWHM / 1.6px) which is probably close to the maximum of my telescope.

In addition this is a first for me. To my astonishment I had never done a HaRGB image before. Now I decided to learn how to do that. It was basically out of necessity because the OIII and SII in this region is apparently so weak that I did not really get a nice SHO out of it (beside the tulip itself). So I gave this a shot. I am extremely happy with it. I managed to get a similar look as LRGB would look like, but the advantage seems to be that you get a lot more structure and structural contrast by doing this combination. In addition in works very well in my medium light pollution location :)

It only felt bad to not use another 4h of data.

Thanks for having a look,



Sven Hoffmann
License: None (All rights reserved)

Sky plot

Sky plot


A tulip in space (SH2-101, HaRGB), 


            Sven Hoffmann