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By Xiga
Hi guys
I thought the DSO season was well and truly over for me, but the weather's been unusually clear here in N.I for the last while that i just couldn't help myself ?
So even though there is no astro dark at this time of year up here at 54 degrees N, i decided i wouldn't let that stop me try for one last target. There was also a very big bright moon up as well, so i figured M13 was pretty much the only viable target for me. Of course, with just a wee SW 80ED to work with (at 510mm FL) i knew i didn't really have the FL to do this one justice, but having never shot a Globular Cluster before i was still excited to give it a go. So here it is:
Shot on May 24 from Crumlin, N.Ireland
20 * 420s with the IDAS-D1 at ISO 200
10 * 60s with the IDAS-D1 at ISO 200
All frames dithered aggressively every frame
Usual gear, Nikon D5300 on a HEQ5-Pro, guided with a QHY5 and PHD2, and captured with SGP.
AstroPixelProcessor used for stacking, gradient reduction, and star colour calibration. Everything else done in Photoshop. The 60s subs were used just for the core.
I'm kind of pleased with how it came out. Although i'm not completely sure tbh, as this is new ground for me, and if there's one area the wee 80ED does struggle a tad with it's with stars, and with a globular there's certainly nowhere to hide on that front!
Also attached is a 100% crop showing just the globular cluster itself.
C&C most welcome as always.
Cheers guys!
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By MikeODay
Update: 3rd June
Re-processed to remove slight magenta tint caused by the non-uniform removal of light pollution by the DBE process ( it was being fooled by the very bright image centre ).
The globular star cluster Omega Centauri ( NGC 5139 ) in Centaurus ( please click / tap on image to see larger and sharper )
A full size image can be found here.
original below
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A newly captured ( May 2018 ) image of the great southern globular star cluster, Omega Centauri ( NGC 5139 )
Omega Centauri ( NGC 5139 ) in Centaurus - ( please click / tap image to see larger and sharper )
A full size ( ~ 6000 x 4000 ) image can be found here
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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 colours of the stars, including in the core.
Image details:
Resolution ........ 0.586 arcsec/px ( full size image )
Rotation .......... 0.00 deg ( up is North )
Focal ............. 1375.99 mm
Pixel size ........ 3.91 um
Field of view ..... 58' 20.9" x 38' 55.1"
Image center ...... RA: 13 26 45.065 Dec: -47 28 27.26
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 Eq8
Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2
Camera:
Nikon D5300 (unmodified) (sensor 23.5 x 15.6mm, 6016x4016 3.9um pixels)\
Location:
Blue Mountains, Australia
Moderate light pollution ( pale green zone on darksitefinder.com map )
Capture ( May 2018 )
8 sets of sub-images with exposure duration for each set doubling ( 2s to 240s ) all at ISO 250.
Processing:
Calibration: master bias, master flat and master dark
Integration in 8 sets
HDR combination
Pixinsight May 2018
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By MikeODay
Also known as the Theta Carinae Cluster, The Southen Pleiades is a very bright open cluster in the Carina constellation. It was discovered by Abbe Lacaille during his visit to South Africa in 1752. Containing around 60 stars, IC 2602 shines with an overall magnitude of 1.9 and its brightest member is Theta Carinae with a visual magnitude of 2.7. This cluster of young blue stars is relatively close to us at "only" 479 light years.
5 May 2018
The Southern Pleiades open star cluster ( IC 2602 ) in Carina ( please click / tap on image to see larger and sharper )
Image details can be found here.
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By MikeODay
Also known as the Theta Carinae Cluster, The Southen Pleiades is a very bright open cluster in the Carina constellation. It was discovered by Abbe Lacaille during his visit to South Africa in 1752. Containing around 60 stars, IC 2602 shines with an overall magnitude of 1.9 and its brightest member is Theta Carinae with a visual magnitude of 2.7. This cluster of young blue stars is relatively close to us at "only" 479 light years.
5 May 2018
The Southern Pleiades ( IC 2602 ) in Carina ( please click / tap on image to see larger and sharper )
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Image details:
Orientation: North is up
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 EQ8
Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2
Camera:
Nikon D5300 (unmodified) (sensor 23.5 x 15.6mm, 6016x4016 3.91um pixels)
Location:
Blue Mountains, Australia
Moderate light pollution ( pale green zone on darksitefinder.com map )
Capture ( 5 May 2018 ):
14 sets of sub-images with exposure duration for each set doubling ( 1/30th sec to 240 sec ) all at ISO250.
( 22 x 240sec + at least 10 each forthe other durations )
Processing:
Calibration: master bias, master flat and master dark
Integration in 14 sets
HDR combination
Pixinsight May 2018
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By MikeODay
The Jewel Box ( NGC 4755 ) is an open cluster of mostly hot young blue-white stars that appears to the unaided eye as a bright 4th magnitude star close to the Southern Cross. Only visible from southern latitudes, the Jewel Box was first recorded by Nicolas Louis de Lacaille during his visit to South Africa in 1751 and was later described by Sir John Herschel as "a casket of variously coloured precious stones" - hence the name "Jewel Box".
The Jewel Box open star cluster ( ngc 4755 ) in Curx ( please click / tap on image to see larger and sharper )
Please see here for image details.
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