Hemisphere:  Southern  ·  Constellation: Pavo (Pav)  ·  Contains:  IC 4836  ·  IC 4842  ·  IC 4845  ·  IC4836  ·  IC4842  ·  IC4845  ·  NGC 6769  ·  NGC 6770  ·  NGC 6771  ·  NGC6769  ·  NGC6770  ·  NGC6771
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Field of small galaxies in the Pavo  'NGC 6769-6770-6771, IC 4836, IC 4842, IC 4845, 



    
        

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Field of small galaxies in the Pavo 'NGC 6769-6770-6771, IC 4836, IC 4842, IC 4845

Getting plate-solving status, please wait...
Field of small galaxies in the Pavo  'NGC 6769-6770-6771, IC 4836, IC 4842, IC 4845, 



    
        

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Powered byPixInsight

Field of small galaxies in the Pavo 'NGC 6769-6770-6771, IC 4836, IC 4842, IC 4845

Imaging telescopes or lenses: PlaneWave Instruments CDK 12.5"

Imaging cameras: Moravian Instrument G4-16000

Mounts: Astro-Physics Inc AP 1100 GTO

Guiding telescopes or lenses: PlaneWave Instruments CDK 12.5"

Guiding cameras: Atik 414EX

Software: TheSkyX  ·  Adobe Photoshop CC 2020  ·  Pixinsight  ·  MaxPilote  ·  FocusMax4

Filters: Chroma Technology Chroma Ha 3nm  ·  Chroma Technology Chroma OIII 3nm  ·  Chroma Technology Chroma Blue  ·  Chroma Technology Chroma Green  ·  Chroma Technology Chroma R  ·  Chroma Technology Chroma L  ·  Chroma Technology Chroma SII 3nm

Accessory: Skyméca DO 3"


Dates:Oct. 20, 2020Oct. 21, 2020Oct. 22, 2020Oct. 23, 2020

Frames:
Chroma Technology Chroma Blue: 15x300" (1h 15') -20C bin 1x1
Chroma Technology Chroma Green: 13x300" (1h 5') -20C bin 1x1
Chroma Technology Chroma L: 139x300" (11h 35') -20C bin 1x1
Chroma Technology Chroma R: 20x300" (1h 40') -20C bin 1x1

Integration: 15h 35'

Darks: ~50

Flats: ~7

Bias: ~200

Avg. Moon age: 5.79 days

Avg. Moon phase: 33.87%

Bortle Dark-Sky Scale: 1.00


Astrometry.net job: 4241912

RA center: 19h 18' 19"

DEC center: -60° 29' 34"

Pixel scale: 0.732 arcsec/pixel

Orientation: -178.752 degrees

Field radius: 0.567 degrees


Resolution: 3946x3939

Data source: Own remote observatory

Remote source: Observatorio El Sauce

Description

Another traget in order to know the limits of our set-up :

Field with many little galaxies, in the center you can see the trio "Devil Mask"

This is a superb triple system NGC 6769-71, located in the southern constellation of Pavo (the Peacock) at a distance of 190 million light-years.

The two upper galaxies, NGC 6770 (right) and NGC 6769 (left), are of equal brightness and size, while NGC 6771 (upper) is about half as bright and slightly smaller. All three galaxies possess a central bulge of similar brightness. They consist of elderly, reddish stars and that of NGC 6771 is remarkable for its "boxy" shape, a rare occurrence among galaxies.

NGC 6769 is a spiral galaxy with very tightly wound spiral arms, while NGC 6770 has two major spiral arms, one of which is rather straight and points towards the outer disc of NGC 6769. NGC 6770 is also peculiar in that it presents two comparatively straight dark lanes and a fainter arc that curves towards the third galaxy, NGC 6771 (below). It is also obvious from this new VLT photo that stars and gas have been stripped off NGC 6769 and NGC 6770, starting to form a common envelope around them, in the shape of a Devil's Mask. There is also a weak hint of a tenuous bridge between NGC 6769 and NGC 6771. All of these features testify to strong gravitational interaction between the three galaxies. The warped appearance of the dust lane in NGC 6771 might also be interpreted as more evidence of interactions. Moreover, NGC 6769 and NGC 6770 are receding from us at a similar velocity of about 3800 km/s - a redshift just over 0.01 - while that of NGC 6771 is slightly larger, 4200 km/s.

As dramatic and destructive as this may seem, such an event is also an enrichment, a true baby-star boom. A cosmic catastrophe like this one normally results in the formation of many new stars. This is obvious from the blueish nature of the spiral arms in NGC 6769 and NGC 6770 and the presence of many sites of star forming regions



in the left bottom IC 4836 a Barred Spiral Galaxy (version B)

at the right center : IC 4845 a Barred Spiral Galaxy (version C)

and many others little objects in the field....

Comments

Revisions

  • Final
    Field of small galaxies in the Pavo  'NGC 6769-6770-6771, IC 4836, IC 4842, IC 4845, 



    
        

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    Original
  • Field of small galaxies in the Pavo  'NGC 6769-6770-6771, IC 4836, IC 4842, IC 4845, 



    
        

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    B
  • Field of small galaxies in the Pavo  'NGC 6769-6770-6771, IC 4836, IC 4842, IC 4845, 



    
        

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    C
  • Field of small galaxies in the Pavo  'NGC 6769-6770-6771, IC 4836, IC 4842, IC 4845, 



    
        

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    D

Sky plot

Sky plot

Histogram

Field of small galaxies in the Pavo  'NGC 6769-6770-6771, IC 4836, IC 4842, IC 4845, 



    
        

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