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Contains:  IC 3578, NGC 4568, Siamese Twins, NGC 4567, NGC 4564
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Siamese Twins - NGC 4568 and NGC 4567, 


            Chris Sullivan
Siamese Twins - NGC 4568 and NGC 4567

Siamese Twins - NGC 4568 and NGC 4567

Technical card

Resolution: 4100x2850

Dates:April 1, 2019April 4, 2019April 7, 2019April 10, 2019April 29, 2019May 7, 2019May 21, 2019

Optolong Blue 1.25": 108x120" (gain: 10.00)
Optolong Green 1.25": 109x120" (gain: 10.00)
Chroma Lo-Glow LP filter: 273x120" (gain: 10.00)
Optolong Red 1.25": 108x120" (gain: 10.00)

Integration: 19.9 hours

Avg. Moon age: 15.17 days

Avg. Moon phase: 24.40%

Bortle Dark-Sky Scale: 7.50 job: 2717553

RA center: 189.132 degrees

DEC center: 11.253 degrees

Pixel scale: 0.427 arcsec/pixel

Orientation: 271.079 degrees

Field radius: 0.296 degrees

Locations: Home Roof (Bortle 7-8 / Est. Sky Quality: 18.53), Springfield, PA, United States

Data source: Backyard


Continuing on my quest to capture as many galaxies as possible during galaxy season, I made the Siamese Twins - a pair of merging (or colliding?) galaxies - a top target this spring. I was really happy to get a result like this on this pair under my skies (and really stoked that I was able to capture the faint 'hook' of stars being ripped from NGC 4567 due to the gravitational pull of NGC 4568 - I didn't know whether that was going to end up being too faint). One thing that attracted me to this target was the different dominant colors between two galaxies that otherwise looked very similar, however, the more I look at them, the less similar I think they look. NGC 4568 reminds me a little of M33 or NGC 2403 with a pinwheel of multiple arms, whereas NGC 4567 appears to have two dominant opposing arms.

Just a quick note on the acquisition: Notice the dates? That was every single clear night in April in May. The weather's just been awful here this spring.



Chris Sullivan
License: None (All rights reserved)


  • Siamese Twins - NGC 4568 and NGC 4567, 


            Chris Sullivan
  • Final
    Siamese Twins - NGC 4568 and NGC 4567, 


            Chris Sullivan



Sky plot

Sky plot


Siamese Twins - NGC 4568 and NGC 4567, 


            Chris Sullivan