SL 17 lies very close to Gum55 and The Dark Tower. It is a dark nebula which is surrounded by an area of hydrogen alpha. Located in the constellation of Scorpius, it can be found at co-ordinates of RA 16hr 54m 01s and Dec -43 36' 17".
The image contains nearly 21 hours of data.
Ha 12.25 hours
Red 3 hours
Green 2.83 hours
Blue 2.66 hours
Marathon effort with the exposures, and well worth it. Fascinating field, and the wolf itself is very dramatic. The halos are quite moderate for the exposure time. Looks very sharp at about 1600 pixels across - fits on my monitor then.
Thanks guys, I really appreciate everyone's comments.
Quote:
Originally Posted by troypiggo
Awesome! What's the field of view there? Haven't heard of SL catalogue. Must look into it. Really nice and unique image.
Thanks Troy, the field of view is 81.2 minutes x 105.7 minutes.
Quote:
Originally Posted by marc4darkskies
Brilliant Paul!
I see an IOTW or perhaps even an APOD in your future!
Cheers, Marcus
Thanks Marcus, that is indeed high praise.
Quote:
Originally Posted by Rigel003
Marathon effort with the exposures, and well worth it. Fascinating field, and the wolf itself is very dramatic. The halos are quite moderate for the exposure time. Looks very sharp at about 1600 pixels across - fits on my monitor then.
At full res (my website image is 90% of full res) the image is sharp but huge. The halos are a product of the reducer I think. Even with the new filters I am getting the same problem as the last lot of filters, albeit slightly better.
Quote:
Originally Posted by gregbradley
Sensational Paul. One of your best. It has a glow about it. The long hours really shows.
Greg.
Thanks Greg, Martin told me that 20 hours is the minimum for integration and I can do this now with automation, using a rotator across the meridian is great and helps a lot with data collection.
The dark nebula really stands out in the soft colours of the surrounding HA.
Very interesting nebula, how did you find this one?
I notice you have diffraction spikes, what did you use to put them in?
Cheers,
Justin.
Justin, I found this nebula by pure accident. I was looking for the dark tower in Scorpius and found this close by. I did one sub in Ha and decided to stick with this one.
It appears like I have diffraction spikes but I think this is a product of my imaging system. I noticed some time ago that Martin Pughs wide field images had a similar look so I guess this might have something to do with the Takahashi scopes. Or there is something with the sensor I am using. In any event it is not deliberate on my behalf.
