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NGC4631 is a starburst galaxy that is viewed edge on from Earth and interacts tidally with the dwarf galaxy NGC4627, forming a "light bridge" between the two objects.   It has also very vibrant star forming regions along its length. Due to its shape it is commonly known as the Whale and Companion. 

The image below is an LRGB image and represents about 7 hours integration and was taken with my Esprit 150. 

Due to poor weather and my multi object acquisition strategy, the image capture ended slightly prematurely since it has now disappeared below my local horizon. ?  

Whilst I'd have liked to gather more data, particular on the Lum channel, I was reasonably pleased at the level of detail revealed. 

Alan

1452388405_21_crop.thumb.jpg.797c501d75d52ac183412886baa4a7dc.jpg

 

 

LIGHTS: L:10, R:6, G:13, B:12 x 600s, DARKS:30, BIAS:100, FLATS:40 all at -20C.

Edited by alan4908
missing words !
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21 hours ago, JohnSadlerAstro said:

Wow that's amazing! The colour is so perfect, what software did you use to process it? :)

John

Thanks for the comment John. :hello:

The image was processed using three software packages:

  • CCDstack: calibration, alignment, stacking, data error rejection, DDP stretch (lum) and deconvolution.
  • PS: contrast enhancement, sharpening, colour enhancement, linear stretches, mask generation. 
  • Pixinsight: gradient reduction (DBE), photometric colour calibration, sharpening (MLT), background noise reduction (TGV).

Alan 

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10 hours ago, Barry-Wilson said:

Terrific Alan - you have shown the tidal streams and surrounding star halo very well.

Many thanks Barry - to be honest, I was a little surprised that these revealed themselves so well with the relatively short lum integration time. 

Alan

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    • By alan4908
      NGC4631 is a starburst galaxy that is viewed edge on from Earth and interacts tidally with the dwarf galaxy NGC4627, forming a "light bridge" between the two objects.   It has also very vibrant star forming regions along its length. Due to its shape it is commonly known as the Whale and Companion. 
      The image below is an LRGB image and represents about 7 hours integration and was taken with my Esprit 150. 
    • By Martin Meredith
      Another night of clear and clouds -- ideal for short live captures! These two are 60s exposures on the usual kit under a half-moon.
      First, ngc4631 and its satellite dwarf galaxy ngc4627, known as the whale and pup.

      Then, being chased by the clouds the only window happened to be Canes Venatici so I took a first look at M51 with the Lodestar:

      Even in a big dob I haven't seen it like that. I dug out some notes from 2011 when M51 hosted a supernova just to check that the bright star at about 5 o'clock wasn't another one  .
      I hate to think what the new monochrome Lodestar would do with this object under moonless skies at a fast f-ratio...
      Does anyone know what the almost vertical faint smear near bottom right is? Looks like a faint edge-on galaxy.
      I pushed up to 90s to get this noticeably less-noise image

      It's beginning to show some oval stars due to running in alt-az mode but nothing to distract from M51 (this isn't AP after all).
      Am I the only one getting decent-ish weather at the moment?
      Martin 
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