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A deep look at Omega Centauri ( NGC 5139 )
Omega Centauri ( please click / tap on image to see larger and much sharper )
This image is an attempt to look deeply into the mighty Omega Centauri star cluster and, by using HDR techniques, record as many of its faint members as possible whilst capturing and bringing out the subtle colours of the stars, including in the core.
( re-processed from May 2017 subs - master dark added to workflow, new HDR / colour process workflow and stretched using ArcSinh )
Field of view ..... 58' 32.3" x 38' 55.6"
Image center ...... RA: 13 26 50.290 Dec: -47 28 39.80
Orientation: East is up, North is to the right
Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ).
Corrector: ASA 2" Coma Corrector Quattro 1.175x.
Effective Focal Length / Aperture : 1470mm f4.7
Mount: Skywatcher AZ Eq6 GT
Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2
Nikon D5300 (unmodified) (sensor 23.5 x 15.6mm, 6016x4016 3.9um pixels)
Blue Mountains, Australia
Moderate light pollution ( pale green zone on darksitefinder.com map )
Capture ( May 2017 ):
9 sets of sub-images with exposure duration for each set doubling ( 1s to 240s ) all at ISO800.
Calibration: master bias, master flat and master dark
Integration in 9 sets
Pixinsight March 2018
So, I’ve set the scope out in the garage to cool but now I’m trying to weigh up the pros and cons of observing tonight.
Pro - It’s the last clear spell forecast here for a week so I might regret not taking the chance.
Con - Its -3 already and only going down from here.
Pro - The seeing was great last night. Spent a couple of hours on the moon at over 450x! Very stable and detailed so it decided to max out by barlowing my 3.2mm BST to give over 700 for a test and although that was less detailed it was still acceptable, so wouldn’t want to miss conditions like that again.
Con - Moon is very full now so perhaps a little less to interest me.
Pro - I’d have managed 11 nights this month which ties with my best for a February.
Con - Work again tomorrow and I’ve been a little tired all day from last night.
So a bit of a tie so far. Anyone else in a quandary tonight?
i was wondering how many of you do sketching? I’ve tried to find some sites to help me get an idea on how it can be done but slightly struggling. For example what type of pencils and paper are preferred is it better to draw on black paper or white? I won’t have goto on my Mount when my scope comes so not sure if it will make it harder without one.Obviously I need a red torch as well. Would like to get some good sketches of the moon and clusters first and then galaxies/nebula and spend a good amount of time on sketching an object. If you have any tips It would be much appreciated also if possible would like to see some samples of sketches that you’ve done
i was wondering do any of you wear eyepatches when you observe through you scope ( Covering the unused eye) the reason I bring this up is I was thinking if it would produce less strain instead of squinting and probably a better view! or you could put it over the observing eye and stop it from getting the night vision ruined.
wonder how many pirate observers there are.