Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: The Thing on Dec 11, 2019, 19:35:20

Title: Rosette Nebula and Cluster NGC2237, 3 Dec 2019
Post by: The Thing on Dec 11, 2019, 19:35:20
This is lovely scope, very happy with it. It would be interesting to see how it performed with a full frame sensor.

Rosette  captured with N.I.N.A. Exp. 30.00s X 577 (4.8 hours).
Image date, time and location:   2019-12-03, Manche, France
Telescope aperture and focal ratio:   Sharpstar 61EDPH with flattener
Camera and filters used:   ZWO ASI294MC Pro - Gain 300.00 (unity 120), Offset 10.00,Temp.-14.10, Baader Neodymnium 1.25" filter
Pixinsight Processing: ABE_PCC_SM_Decon_MLT_HT_MT_CS_Conv(stars)_LHE_SCNR - it's a bit over sharpened.

Click image for full size uncropped version (you may have to download it to see the full resolution).
(http://gallery.orpington-astronomy.org.uk/albums/userpics/10050/normal_Rosette_B__E30_00sX577_G300_00_010_00_T-14_10_ABE_PCC_SM_Decon_MLT_HT_MT_CS_Conv28stars29_LHE29SCNR.jpg) (http://gallery.orpington-astronomy.org.uk/albums/userpics/10050/Rosette_B__E30_00sX577_G300_00_010_00_T-14_10_ABE_PCC_SM_Decon_MLT_HT_MT_CS_Conv28stars29_LHE29SCNR.jpg)
Title: Re: Rosette Nebula and Cluster NGC2237, 3 Dec 2019
Post by: Apophis on Dec 12, 2019, 10:02:50
Good one ,thought it should have more of a red hue?
Roger
Title: Re: Rosette Nebula and Cluster NGC2237, 3 Dec 2019
Post by: The Thing on Dec 12, 2019, 13:02:06
Thanks Roger. It's all subjective. I don't like subjects too uniformly red as the nebulosity variations are masked.
Title: Re: Rosette Nebula and Cluster NGC2237, 3 Dec 2019
Post by: RobertM on Dec 12, 2019, 22:32:18
Hi Duncan,

Nice capture, good to see another image from you.  You've got some good star shapes there, we do colours to our own personal taste though it does look a little luminous for mine.

Did you use SharpCap to recommend sub exposure length and number of exposures ?  577 subs - must have heated that poor Intel CPU up a bit !

Best
Robert
Title: Re: Rosette Nebula and Cluster NGC2237, 3 Dec 2019
Post by: The Thing on Dec 13, 2019, 14:45:10
Thanks Robert. Yes it took ages to calibrate and stack using the new WBPP Weighted Batch Pre-Procesing script which is excellent. I have an i7 4GHz 8 processor 16Gb desktop PC and it took about 2.5 hours. However it is a set it and forget it operation unless there is an error - such as PI seemingly being unable to get the bayer matrix code (RGGB) from the FITS file automatically so I have to remember to set it and not use 'Auto'. The script doesn't throw the error until it tries to debayer.
Title: Re: Rosette Nebula and Cluster NGC2237, 3 Dec 2019
Post by: NoelC on Dec 15, 2019, 10:48:51
Just terrific.
so much detail.
Noel
Title: Re: Rosette Nebula and Cluster NGC2237, 3 Dec 2019
Post by: Hugh on Dec 15, 2019, 23:29:39
A really lovely picture!

I clicked into the pic and then clicked again and got a magnified view of part of the picture which shows many more stars than you can see in the initial laptop picture. Doing a (very rough) calculation of the possible number of stars, I came up with at least, and probably many more than, 42,000!

Wow!

Hugh
Title: Re: Rosette Nebula and Cluster NGC2237, 3 Dec 2019
Post by: The Thing on Dec 16, 2019, 08:23:24
Thanks Hugh, yes it's really full of stars!
Title: Re: Rosette Nebula and Cluster NGC2237, 3 Dec 2019
Post by: The Thing on Dec 16, 2019, 08:32:55
Hi Robert,

Further to your query of the 1st inst. - 577 subs were the good ones out of 600 which is what I managed to get NINA to do in the time available. Unlike Voyager you can't have a sequence run until the end of astronomical dark so you have to do an old fashioned guestimate of how many subs factoring in time for a flip, which NINA handles perfectly.

And as to luminosity, it will look good in Dougs observing report up on the big screen ;)

Duncan
Title: Re: Rosette Nebula and Cluster NGC2237, 3 Dec 2019
Post by: Roberto on Dec 17, 2019, 15:10:09
Well done!  That's quite a lot of frames to go through!

Roberto