Hemisphere:  Southern  ·  Constellation: Piscis Austrinus (PsA)  ·  Contains:  IC 5168  ·  IC5168  ·  NGC 7214  ·  NGC7214
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The Very Rare Hickson 91 Compact Galaxy Group, 


            Russ Carpenter
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The Very Rare Hickson 91 Compact Galaxy Group

Technical card

Dates:Aug. 17, 2020

Frames: 15x600"

Integration: 2.5 hours

Avg. Moon age: 27.78 days

Avg. Moon phase: 3.42%

Astrometry.net job: 3778690

RA center: 22h 9' 3"

DEC center: -27° 48' 13"

Pixel scale: 0.957 arcsec/pixel

Orientation: 89.489 degrees

Field radius: 0.265 degrees

Resolution: 1424x1393

Data source: Amateur hosting facility

Remote source: ChileScope


The largest of the three spirals (NGC 7214) in the Hickson 91 group is only 1.4 arcmin wide, but this is still a pleasing image. You can easily see the tidal tails caused by the galaxies’ gravitational interactions. At some distant time in the future the galaxies in this compact group will merge.

This is an RGB image.

Tech Notes for ASA 500/3.6:
ASA Newtonian, 500 mm aperture, 1900mm focal length, F3.6
FLI Proline 16803, 9 mm pixel, 4096 X 4096
ASA DDM85 equatorial mount
Processing with PixInsight, StarTools and Affinity Photo


Sky plot

Sky plot


The Very Rare Hickson 91 Compact Galaxy Group, 


            Russ Carpenter