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Galaxy NGC 4945 in Centaurus 

5b014e0ca2da4_file20-5-1882607pm.thumb.jpeg.0ace42549a1707988e3afd7e5f8771a8.jpeg

 

Details:

Galaxy NGC 4945 in Centaurus
19 May 2018

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)

 

image Plate Solver script version 5.0

===========

Resolution ........ 0.586 arcsec/px

Rotation .......... North is up

Focal ............. 1375.43 mm

Pixel size ........ 3.91 um

Field of view ..... 43' 27.2" x 28' 54.2"

Image center ...... RA: 13 04 51.790 Dec: -49 30 37.17

==========

 

Location:
Blue Mountains, Australia 
Moderate light pollution ( pale green zone on darksitefinder.com map )

Capture ( 19 May 2018 ):
10 sets of sub-images with exposure duration for each set doubling ( 1/2th sec to 240 sec ) all at ISO250.
( 41 x 240sec + ~8 each forthe other durations )

Processing:
Calibration: master bias, master flat and master dark
Integration in 10 sets
HDR combination 

Pixinsight May 2018

Edited by MikeODay
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3 minutes ago, teoria_del_big_bang said:

A breath-taking clear image :thumbsup::thumbsup::thumbsup:

Steve

Thanks Steve, much appreciated :)

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Very nicely done Mike.  I love the contrast between the galaxy and the blue star to the right. Great job!

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I like the dust lanes that give the galaxy a plate like look--3D spiral.

Rodd

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16 hours ago, Adreneline said:

That's stunning Mike. Thank you for sharing.

Adrian

 

15 hours ago, kirkster501 said:

Very nicely done Mike.  I love the contrast between the galaxy and the blue star to the right. Great job!

 

6 hours ago, Rodd said:

I like the dust lanes that give the galaxy a plate like look--3D spiral.

Rodd

Thanks guys for you kind comments, they are much appreciated!

Cheers

Mike

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20 hours ago, kirkster501 said:

Very nicely done Mike.  I love the contrast between the galaxy and the blue star to the right. Great job!

It was quite a struggle to pull the galaxy out of the dark!  SkySafari says that " NGC 4945 one of the brightest galaxies within the Centaurus A/M83 Group - a large, nearby group of galaxies. The galaxy is the second brightest within the group, after Centaurus A (NGC 5128)"  and states its magnitude as 7.91 but I have serious doubts!

In Pixinsight, on a scale of 0..1, I can usually see the clouds of nebula etc. by the time a stretch the backround to a value of 0.001 but not this time!  At 0.001 heaps of stars were visible but the galaxy was still missing!  And these stars, the ones that I could see when the galaxy was still hidden in the gloom, these stars had listed magnitudes of way below 7.9.

I will do some checking to see what other sources say about its magnitude.

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11 hours ago, Rodd said:

I like the dust lanes that give the galaxy a plate like look--3D spiral.

Rodd

Thanks Rodd, although with this one, I think I need both more data and to learn how to minimise the stars ( most of which are brighter than the galaxy ) if I am going to really show off the dust lanes and faint detail.  Oh, well the moon will go away again soon :)

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