Sh2-7 A Conceptual-Art NebulaOTA:……………….TAO 150 (f/7.3)
Camera:………….FLI - ML16200 (1.13 arcsec/pixel)
Observatory:….Deep Sky West, Chile EXPOSURES:
…R…….41 x 120 sec.
…B…....46 x 120
…G…….40 x 120
…H.…...34 x 300
Total exposure 7.7 hours
Image Width: 1.4 deg
Processed by Alex Woronow (2020) using PixInsight, Topaz, 3DLut, SWT
The bright blue star 7 delta Sco (Dschubba) in Scorpius is surrounded by a faint nebula. There’s not a whole lot written about this nebula, and the image is not that interesting either. Ha has augmented the red and blue channels (in the appropriate H-alpha/H-beta proportion) by 2x to the calculated Ha-line intensity. Sh2-7 does not receive illumination from 7 delta Sco, which reportedly lies at 136 lyrs distance from us, whereas the nebula lies at 650 lyrs.
With this large number of subframes through each filter, the possibility of using “lucky imaging” on this DSO presents itself. I’ve been pondering the workflow that would accommodate Autostakkert!, which generally expects relatively bright images as input (i.e., images of the moon or planets). If anyone out there has used it successfully on DSO for multiband images and would like to share their technique, “I’m listening, Seattle.” (Apologies to the younger among us for that ancient reference.)
Oh yes, and here’s a work of Conceptual Art appro pro of this image:
=11.0pthttps://www.moma.org/collection/works/59546?sov_referrer=art_term&art_term_slug=conceptual-artI also make Baldessari’s promise.
Cheers, Alex
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