Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  NGC 3539  ·  NGC 3550  ·  NGC 3558  ·  NGC 3561  ·  NGC3536  ·  NGC3539  ·  NGC3550  ·  NGC3552  ·  NGC3553  ·  NGC3554  ·  NGC3558  ·  NGC3561  ·  PGC1831671  ·  PGC1831748  ·  PGC1832115  ·  PGC1832934  ·  PGC1833551  ·  PGC1833795  ·  PGC1834400  ·  PGC1834590  ·  PGC1834602  ·  PGC1835035  ·  PGC1835228  ·  PGC1835536  ·  PGC1835583  ·  PGC1836391  ·  PGC1836835  ·  PGC1836919  ·  PGC1837035  ·  PGC1837234  ·  And 123 more.
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NGC 3561 "The Guitar", Arp 105, Abell 1185, 


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NGC 3561 "The Guitar", Arp 105, Abell 1185

Imaging telescopes or lenses: Sky-Watcher QUATTRO-10CF 10" f/4 Newton Carbon

Imaging cameras: ZWO ASI 294MC Pro (cooled)

Guiding telescopes or lenses: Guidescope 60mm f=240mm

Guiding cameras: Datyson T7C Guidecam

Software: APP  ·  Noiseware Community Edition  ·  APT  ·  PHD2 Guiding

Filters: SVBony UV/IR cut filter 2"

Accessory: GPU Optics Pal Gyulai CC

Dates:Feb. 13, 2021

Frames: 20x300" (gain: 120.00) -10C bin 1x1

Integration: 1.7 hours

Darks: ~20

Flats: ~33

Flat darks: ~33

Avg. Moon age: 1.68 days

Avg. Moon phase: 3.16%

Bortle Dark-Sky Scale: 4.00

Temperature: -10.00

Astrometry.net job: 4224348

RA center: 11h 10' 42"

DEC center: +28° 41' 20"

Pixel scale: 0.960 arcsec/pixel

Orientation: 9.075 degrees

Field radius: 0.667 degrees

Resolution: 4136x2814

Data source: Own remote observatory

Remote source: Non-commercial independent facility


Today I would like to show you a small intermediate status of a project which could interest you.
In this night I had a completely different target, but as this stood quite low at 4h in the morning, I have decided for the last nearly 2h to take a galaxy cluster on target.
It's Abell 1185 and the famous "guitar" NGC 3561 (as group: Arp 105).
Of course 20x300sec are quite not enough (I'm already glad that the tidal tail at NGC 3561 can be seen). But the combination with the galaxy cluster makes the whole image an interesting composition.
Long exposure images show the dense galaxy cluster with dozens of galaxies and very few foreground stars as well as the diversified Arp group.

Overall, I have found only a few images here on AB. I wonder why this is so!
I will certainly put some exposure time on it.