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Contains:  NGC 3808
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ARP87 - The Spool and Spindle, 


            Jason Guenzel
ARP87 - The Spool and Spindle

ARP87 - The Spool and Spindle

Technical card

Resolution: 1200x1200

Dates:Nov. 24, 2017Nov. 27, 2017Dec. 20, 2017

Blue: 15x240" -20C bin 1x1
Green: 15x240" -20C bin 1x1
Luminance: 86x180" -20C bin 1x1
Red: 15x240" -20C bin 1x1

Integration: 7.3 hours

Darks: ~50

Flats: ~50

Bias: ~256

Avg. Moon age: 5.17 days

Avg. Moon phase: 30.59%

Bortle Dark-Sky Scale: 5.00 job: 1891927

RA center: 175.187 degrees

DEC center: 22.438 degrees

Pixel scale: 0.527 arcsec/pixel

Orientation: 182.053 degrees

Field radius: 0.124 degrees


ARP87 consists of NGC3808A and NGC3808B which are around 300mly distant in Leo. The pair of spirals underwent a recent interaction (a couple hundred million years ago) that left streams of stars stretched across inter-galactic space. I was happy to see that I was able to capture the faint tendrils that wrap around the smaller galaxy at least twice. As a result, I just gave it the first name that popped in my head. It reminded me of a big spool feeding a spindle. The bright blue of star birth activity can clearly be seen in the disturbed arms. There is a beauty of a face-on spiral down in the corner of the full image, too. I'm uploading a second revision which is just a crop into the center to make the target galaxies more visible.

I can add this to the list of crazy small targets I went after at the end of 2017. I've been shut down for several weeks due to weather. So, I poked around with this dataset and it was of surprising quality for the amount of integration I was able to acquire. The pairing is barely more than an arc-minute wide.



Jason Guenzel
License: None (All rights reserved)


  • ARP87 - The Spool and Spindle, 


            Jason Guenzel
  • Final
    ARP87 - The Spool and Spindle, 


            Jason Guenzel



Sky plot

Sky plot


ARP87 - The Spool and Spindle, 


            Jason Guenzel