Hemisphere:  Northern  ·  Constellation: Camelopardalis (Cam)  ·  Contains:  NGC 2655
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NGC 2655 (ARP 225), 


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NGC 2655 (ARP 225)

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NGC 2655 (ARP 225), 


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NGC 2655 (ARP 225)

Imaging telescopes or lenses: Planewave CDK24

Imaging cameras: FLI Proline 16803

Mounts: Planewave L600

Guiding cameras: Starlight Xpress Ultrastar

Focal reducers: None

Software: Planewave PWI3  ·  Planewave PWI4  ·  PixInsight 1.8  ·  Sequence Generator Pro  ·  Photoshop CS3  ·  PHD Guiding 2  ·  CCDWare CCD Inspector  ·  Maxim DL6

Filters: Astrodon 50mm B  ·  Astrodon 50mm R  ·  Astrodon 50mm L  ·  Astrodon 50 mm G

Accessory: FLI CFW-5-7  ·  Astrodon Monster MOAG  ·  Hedrick Focuser  ·  Planewave Delta-T  ·  Planewave EFA

Dates:Jan. 23, 2020Jan. 24, 2020

Astrodon 50 mm G: 8x900" (2h) -30C bin 1x1
Astrodon 50mm B: 8x900" (2h) -30C bin 1x1
Astrodon 50mm L: 27x900" (6h 45') -30C bin 1x1
Astrodon 50mm R: 8x900" (2h) -30C bin 1x1

Integration: 12h 45'

Darks: 20

Flats: 80

Flat darks: 80

Bias: 20

Avg. Moon age: 28.68 days

Avg. Moon phase: 1.08%

Mean SQM: 21.30

Mean FWHM: 2.00

RA center: 08h56m16s.262

DEC center: +78°1049.47

Pixel scale: 0.468 arcsec/pixel

Orientation: -178.615 degrees

Field radius: 0.290 degrees

More info:Open 

Resolution: 3192x3126

Locations: KG Observatory, Julian, CA, United States

Data source: Backyard


First opportunity to image since November. The Julian winter skies prevented imaging in December. So more holiday time with the family. (-:

I wanted to start the new decade with something very difficult, very far and rarely imaged. NGC2655 at 80 Million Light Years - FAR beyond the bright stars of our own Milky Way galaxy (shown here) - was my choice.

"Floating in the serenity of the universe like a cosmic ammonite shell, NGC 2655 is an impressive example of a lenticular galaxy. Located 80 million light years away towards the constellation of Camelopardalis (The Giraffe), its series of outer shell structures and faint tidal loops are nicely complemented by internal dust lanes near its core.

Its panoply of morphological kinematics are indicative of a merger between two galaxies in the past, an intergalactic event that is now known to be a common feature of the evolution of galaxies. Other signatures of a past merger that aren't apparent to the eye are vast clouds of neutral hydrogen surrounding the galaxy that were uncovered in observations made using radio telescopes.

The unusual appearance of NGC 2655 brought it to the attention of the famous astronomer Halton Arp who added it to his atlas of peculiar galaxies under Arp 225. Another distinction is that the core is very luminous, which means that NGC 2655 belongs to the category of active galaxies known as Seyfert galaxies, which were named after the astronomer Karl Seyfert. The luminosity of Seyfert galaxies is thought to derive from a transfer of matter onto an accretion disk around a supermassive black hole.

The diameter of NGC 2655 is approximately 200,000 light years but the envelope of neutral hydrogen gas discovered in the 1980's is about 500,000 light years."

From Ann at APOD...

"Wow, that's a fantastic image! And I had most certainly never seen this galaxy before! (Hope you don't mind that I inserted a version of your picture from your website, as the attachment wouldn't have shown up when I quoted your post.)

You quoted a text that described NGC 2655 as a galaxy with a "series of outer shell structures". I disagree. Take a look at the picture of NGC 474, which is a true shell galaxy, and note how it differs from NGC 2655. The shells of NGC 474 are extremely circular and sharp, and the obvious tidal features are also elegantly symmetrical.

I think that NGC 2655 is a fantastic spiral galaxy. Its spiral arms are broad and diffuse, because NGC 2655 no longer forms any stars, but the arms are still clearly discernible, and they are very long. One outer arm appears to make almost two full turns around its parent galaxy!

The arms are asymmetrical, like practically all galactic spiral arms are. That's all the more proof that they are spiral arms and not shells.

It's a superb image! Thanks!



Sky plot

Sky plot


NGC 2655 (ARP 225), 



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