Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  IC 4845, IC 4842, NGC 6771, NGC 6770, NGC 6769
Getting plate-solving status, please wait...

NGC 6769-6770-6771 - Interacting Galaxies

Technical card

Resolution: 2218x1479

Dates:Oct. 6, 2018

Frames: 64x900"

Integration: 16.0 hours

Avg. Moon age: 26.62 days

Avg. Moon phase: 9.30%

Astrometry.net job: 2321752

RA center: 289.873 degrees

DEC center: -60.501 degrees

Pixel scale: 0.804 arcsec/pixel

Orientation: 215.910 degrees

Field radius: 0.298 degrees

Data source: Own remote observatory

Remote source: Non-commercial independent facility

Description

NGC 6769-6770-6771 form this superb triple system in the southern constellation of Pavo. It is also known as the Devil's Mask. The trio are 190 million light years away, and receding. Both NGC 6769 and NGC 6770 are receding at similar velocities of about 3800 km/s - a redshift just over 0.01, while NGC 6771 is receding at a slightly higher rate of 4200 km/s.

The central bulge in all three galaxies are of similar brightness. NGC 6771 has an interesting boxy shape which is indeed a rare occurrence among galaxies. It is unusual in that it has two comparatively straight dark lanes and a fainter arc that curves towards the third galaxy

Both NGC 6769 and NGC 6770 are spiral galaxies, yet very different. NGC 6769 has very tightly wound spiral arms, while NGC 6770 has two major spiral arms, one of which is fairly straight pointing towards the outer disc of NGC 6769. The blueish colour of the spiral arms indicate the presence of many star forming regions.

IC4845, a Barred Spiral Galaxy. Its angular size is 1.207’ 0.893’ (arcmin). Surprisingly, even with a modest instrument (25 cm), the galaxy presents remarkable fine details.

Exposure Details:
Lum 37X900 Bin1X1
Red 22X450 Bin2X2
Green 18X450 Bin2X2
Blue 15X450 Bin2X2
Total time hours

Instruments Used:
10 Inch RCOS fl 9.1
Astro Physics AP-900 Mount
SBIG STL 11000m
FLI Filter Wheel
Astrodon Lum, Red, Green, Blue Filters

Software Used
CCDStack (calibration, alignment, data rejection, stacking)
Photoshop CS 6 (Image processing)

Thanks for looking

Comments

Author

trobison
Terry Robison
License: None (All rights reserved)
2942
Like

Sky plot

Sky plot

Histogram

NGC 6769-6770-6771 - Interacting Galaxies, 





    
        

            Terry Robison