Hemisphere:  Northern  ·  Contains:  NGC 7789
Caroline's Rose Cluster NGC7789, 


            Vikas Sahota
Caroline's Rose Cluster NGC7789
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Caroline's Rose Cluster NGC7789

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Technical card

Imaging telescopes or lenses: Altair Astro 72edf deluxe

Imaging cameras: Altair Hypercam 183M PRO TEC

Mounts: DarkFrame Optics StellarDrive 6

Guiding telescopes or lenses: Altair Astro 60 mm guidescope

Guiding cameras: Altair GPCAM3 178M

Focal reducers: Altair Astro 0.80 Focal Reducer-Flattner

Software: PHD Guiding 2  ·  EQMOD EQAscom  ·  SharpCap 3.2  ·  AstroPixel Processor  ·  Pro Digital Software AstroFlat Pro

Filters: Skytech LPRO Max

Accessory: Pegasus Astro Pocket Powerbox  ·  Pegasus Astro FocusCube  ·  Altair Astro DewZapper 3-4.5" OD HIGH POWER Dew Heater

Dates:June 2, 2019June 16, 2019June 17, 2019

Baader B 2": 21x165" (gain: 381.00) -15C bin 1x1
Baader G 2": 13x135" (gain: 381.00) -15C bin 1x1
Skytech LPRO Max: 18x90" (gain: 381.00) -15C bin 1x1
Baader R 2": 6x360" (gain: 381.00) -15C bin 1x1

Integration: 2.5 hours

Darks: ~50

Flats: ~50

Bias: ~200

Avg. Moon age: 19.13 days

Avg. Moon phase: 66.74%

Bortle Dark-Sky Scale: 6.00

Basic astrometry details

Astrometry.net job: 3048801

RA center: 23h 57' 49"

DEC center: +56° 44' 42"

Pixel scale: 1.393 arcsec/pixel

Orientation: 46.397 degrees

Field radius: 0.940 degrees

Resolution: 1824x1216

Locations: Backyard, Slough, Berkshire, United Kingdom

Data source: Backyard


Carolines Rose Cluster imaged in LRGB with Altair's Hypercam 183m PROTEC. Short nights and plenty of clouds meant this took a couple of weeks to assemble a decent set of data.

This was discovered way back in 1783 by Caroline Herschel, sister and chief cataloguing wizard of William Herschel, and of course great astronomer in her own right. It must have been spotted on the 20ft reflector at the Herschell observatory right here in Slough :)



Vikas Sahota
License: None (All rights reserved)


  • Final
    Caroline's Rose Cluster NGC7789, 


            Vikas Sahota
  • Caroline's Rose Cluster NGC7789, 


            Vikas Sahota
  • Caroline's Rose Cluster NGC7789, 


            Vikas Sahota
  • Caroline's Rose Cluster NGC7789, 


            Vikas Sahota


Description: improved my L and B subs and calibrated the star colours


Description: I wanted to reprocess this early one as I was pretty sure I could improve this now. We had a clouple hours of clear yesterday so I did a speed run, grabbing 15s subs at high gain and stacking 100 frames for each filter. Combining that with earlier unity gain data, I came to this result.

Sky plot

Sky plot


Caroline's Rose Cluster NGC7789, 


            Vikas Sahota